WO2015060246A1 - Plug for well drilling - Google Patents
Plug for well drilling Download PDFInfo
- Publication number
- WO2015060246A1 WO2015060246A1 PCT/JP2014/077831 JP2014077831W WO2015060246A1 WO 2015060246 A1 WO2015060246 A1 WO 2015060246A1 JP 2014077831 W JP2014077831 W JP 2014077831W WO 2015060246 A1 WO2015060246 A1 WO 2015060246A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- plug
- mandrel
- well
- peripheral surface
- outer peripheral
- Prior art date
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1291—Packers; Plugs with mechanical slips for hooking into the casing anchor set by wedge or cam in combination with frictional effect, using so-called drag-blocks
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Definitions
- the present invention relates to a well drilling plug and a well drilling method used in well drilling performed to produce hydrocarbon resources such as oil or natural gas.
- Hydrocarbon resources such as oil or natural gas have been mined and produced through wells (oil wells or gas wells, sometimes called “wells”) that have porous and permeable underground layers. With the increase in energy consumption, the wells have been deepened, and there are records of excavation exceeding 9000m in the world, and there are also deep wells exceeding 6000m in Japan.
- the acid treatment and the crushing method are known as a stimulation method (Patent Document 1).
- Acid treatment increases the permeability of the production layer by injecting a mixture of strong acids such as hydrochloric acid and hydrogen fluoride into the production layer and dissolving the rock reaction components (carbonates, clay minerals, silicates, etc.)
- strong acids such as hydrochloric acid and hydrogen fluoride
- rock reaction components carbonates, clay minerals, silicates, etc.
- various problems associated with the use of strong acids have been pointed out, and an increase in cost has been pointed out including various countermeasures.
- fracturing method also referred to as “fracturing method” or “hydraulic fracturing method”
- the hydraulic fracturing method is a method in which a production layer is cracked by a fluid pressure such as water pressure (hereinafter sometimes simply referred to as “water pressure”).
- a fluid pressure such as water pressure (hereinafter sometimes simply referred to as “water pressure”).
- water pressure a fluid pressure
- a vertical hole is excavated, followed by a vertical hole.
- these well holes which means holes to form wells, sometimes referred to as “down holes”.
- Fracturing fluid is fed into the tank at a high pressure, and cracks (fractures) are generated by water pressure in deep underground production layers (layers that produce hydrocarbon resources such as oil or natural gas), and hydrocarbon resources are collected through the fractures.
- It is a production layer stimulation method for.
- the hydraulic fracturing method has attracted attention for its effectiveness in the development of unconventional resources such as so-called shale oil (oil aged in shale) and shale gas.
- Cracks (fractures) formed by fluid pressure such as water pressure are immediately closed by formation pressure when water pressure disappears.
- the propellant is contained in the fracturing fluid (that is, the well treatment fluid used for fracturing), and the proppant is fed into the well hole and the proppant is introduced into the crack (fracture).
- the proppant to be contained in the fracturing fluid an inorganic or organic material is used.
- Silica, alumina and other inorganic particles are used, and sand particles such as 20/40 mesh sand are widely used.
- the well treatment fluid such as fracturing fluid
- various types of water base, oil base and emulsion are used.
- the well treatment fluid is required to have a function capable of transporting proppant to a place where fractures are generated in the well hole. Therefore, the well treatment fluid usually has a predetermined viscosity and good dispersibility of proppant. Ease of processing and low environmental impact are required.
- the fracturing fluid may contain a channelant for the purpose of forming a channel through which shale oil, shale gas, etc. can pass between the proppants. Therefore, in addition to proppant, various additives such as a channelant, a gelling agent, a scale inhibitor, an acid for dissolving rocks, and a friction reducing agent are used in the well treatment fluid.
- fracturing fluid to create cracks (fractures) due to water pressure in deep underground production layers (layers that produce hydrocarbon resources such as oil or natural gas such as shale gas)
- the predetermined section is partially blocked while sequentially closing from the tip of the well hole, and the blockage is blocked.
- Fracturing fluid is fed into the compartment at high pressure to cause cracks in the production layer.
- fracturing is performed by closing the next predetermined section (usually, a section before the preceding section, that is, a section on the ground side). Thereafter, this process is repeated until the necessary sealing and fracturing are completed.
- the production layer may be stimulated again by fracturing the desired section of the well hole that has already been formed. In that case as well, operations for blocking and fracturing the well hole may be repeated. Further, in order to finish the well, the well hole may be closed to shut off the fluid from the lower part, and after the upper part is finished, the closing may be released.
- Patent Documents 2 to 4 disclose blocking of a well hole.
- well drilling plugs also referred to as “flac plugs”, “bridge plugs” or “packers” that can be fixed are disclosed.
- Patent Document 2 discloses a downhole plug for well excavation (hereinafter, simply referred to as “plug”), specifically, a mandrel (main body) having a hollow portion in the axial direction, On the outer peripheral surface orthogonal to the axial direction of the mandrel, along the axial direction, a ring or an annular member (annular member), a first conical member (slip) and a slip, elastomer or rubber are formed.
- a plug comprising a malleable element, a second conical member and slip, and an anti-rotation mechanism.
- the blocking of the well hole by the downhole plug for well drilling is as follows.
- the mandrel has a hollow portion in the axial direction, and a well or the like can be sealed by setting a ball or the like on the hollow portion.
- metal materials aluminum, steel, stainless steel, etc.
- fibers, wood, composite materials, plastics and the like are widely exemplified, and preferably a composite material containing a reinforcing material such as carbon fiber, in particular, It is described that it is a composite material containing a polymer such as an epoxy resin or a phenol resin, and that the mandrel is formed of aluminum or a composite material.
- a material that decomposes by temperature, pressure, pH (acid, base) or the like can be used for the ball or the like in addition to the materials described above.
- Patent Document 3 discloses a packer assembly for well excavation in which each packer is detachably connected to an adjacent packer.
- a mandrel having a hollow portion in the axial direction, an outer peripheral surface orthogonal to the axial direction of the mandrel, along the axial direction, slip, slip wedge (slip wedge), elastic packer element And a packer with an extrusion limiter and the like.
- Oil such as shale oil or natural gas such as shale gas (hereinafter collectively referred to as “oil and natural gas” or These may need to be removed when production such as “oil and / or natural gas” is initiated.
- Plugs are usually not designed to be recovered after removal from clogging, so they can be removed by crushing, drilling or other methods of breaking or breaking into pieces, but crushing, drilling, etc. Needed a lot of money and time. There are also specially designed plugs that can be recovered after use (retrievable plug), but since the plugs are deep underground, recovering all of them requires a lot of money and time. Was.
- Patent Document 4 discloses a disposable downhole tool (which means a downhole plug or the like) or a member thereof containing a degradable material that decomposes when exposed to an environment in a well.
- degradable materials degradable polymers such as aliphatic polyesters such as polylactic acid are disclosed.
- Patent Document 4 discloses a cylindrical body part (tubular body element) having a flow hole in the axial direction and an outer peripheral surface orthogonal to the axial direction of the cylindrical body part along the axial direction.
- a combination of a packer element assembly consisting of an upper sealing element, a central sealing element and a lower sealing element, and a slip and a mechanical slip body is described. Further, it is disclosed that a flow of only one direction of fluid is allowed by setting a ball in the flow hole of the cylindrical main body part.
- Patent Document 4 does not disclose whether the downhole tool or its member uses a material containing a degradable material.
- downhole tools and downhole tool members that are plugs for well excavation are required to have sufficient resistance to high loads that are applied during transfer, maintenance of well closure, and closure during fracturing.
- a load of about 45 kN (corresponding to about 10,000 pound weight) or more is applied in order to close a well hole and maintain the blockage during fracturing. Therefore, for example, the downhole tool and the downhole tool member which are plugs for well excavation reach a normal temperature of 66 ° C. (corresponding to about 150 ° F.), and in some cases, the temperature may exceed 100 ° C.
- the downhole tool that is a plug for well excavation or a part or all of the member by disassembling after the completion of fracturing.
- the well drilling plug is damaged in the environment of the well until the operations associated with fracturing are completed. It must be capable of having no required mechanical properties (tensile properties and / or compressive properties).
- the problem of the present invention is that the mining conditions such as deepening are becoming more severe and diverse, and the load of the heavy load applied to the bent portion is reduced, so that the transfer in the well is ensured.
- An object of the present invention is to provide a well drilling plug that can close and fracture a hole, reduce the cost of well drilling, and shorten the process by facilitating removal and securing of a flow path. Furthermore, the subject of this invention is providing the well drilling method which uses this plug for well drilling.
- a well drilling plug comprising a mandrel and a member attached on an outer peripheral surface perpendicular to the axial direction of the mandrel is transferred within the well.
- a high stress concentration occurs in the bent portion of the mandrel or the member, and as a result of further research, by controlling the shape of the bent portion in the mandrel or the member.
- a well drilling plug comprising a mandrel and a member attached on an outer peripheral surface perpendicular to the axial direction of the mandrel, the mandrel or the member At least one A well drilling plug is provided, which is formed of a degradable material and has a curvature radius of 0.5 to 50 mm at a bent portion thereof.
- At least one member selected from the group consisting of a slip, a wedge, a pair of ring-shaped fixing members, and a ring-shaped rubber member capable of expanding the diameter is attached to the outer peripheral surface orthogonal to the axial direction of the mandrel.
- the pair of ring-shaped fixing members can fix an expandable ring-shaped rubber member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel in a compressed state
- Plug for well drilling (4) The well drilling plug according to (2) or (3), wherein a combination of at least one slip and a wedge is placed between a pair of ring-shaped fixing members.
- the aliphatic polyester is polyglycolic acid.
- the mandrel formed of a degradable material has a male screw structure on the outer peripheral surface, and one of the pair of ring-shaped fixing members has a female screw structure facing the male screw structure on the inner peripheral surface, and
- One of the pair of ring-shaped fixing members is a plug for well excavation according to any one of (1) to (18), wherein the plug is fixed so that it cannot slide in the axial direction of the mandrel.
- a well drilling method is provided in which part or all of a well drilling plug is disassembled.
- a well drilling plug comprising a mandrel and a member attached on an outer peripheral surface perpendicular to the axial direction of the mandrel, wherein the mandrel or at least one of the members is disassembled.
- the plug for well drilling is characterized by the fact that it is formed from a conductive material and the curvature radius of the bent part is 0.5 to 50 mm. Under such circumstances, it is possible to reduce the load of a large load applied to the bent portion, reliably perform transfer in the well, close the well hole, and fracturing, and to remove and flow This makes it possible to provide a well drilling plug that can reduce the cost of well drilling and shorten the process.
- the well drilling method is characterized by the fact that mining conditions such as deepening are becoming increasingly severe and diverse, reducing the load of heavy loads on the bent part, Well drilling that can reduce the cost of well drilling and shorten the process by making it possible to reliably transfer the inside of the well, close the well hole and fracturing, and facilitate the removal and securing of the flow path. An effect is provided that a method is provided.
- FIG. 1B is a schematic front cross-sectional view showing a state in which the diameter of an annular rubber member capable of expanding the diameter of the well excavation plug of FIG. It is a typical front view of the mandrel which has a flange part.
- the present invention is a well drilling plug comprising a mandrel and a member mounted on an outer peripheral surface perpendicular to the axial direction of the mandrel, wherein the mandrel or at least one of the members is formed of a degradable material, and Further, the present invention relates to a well excavation plug characterized in that the radius of curvature of the bent portion is 0.5 to 50 mm.
- a description will be given with reference to FIGS. 1A and 1B.
- the plug for well excavation of this invention is a plug for well excavation provided with the mandrel and the member attached on the outer peripheral surface orthogonal to the axial direction of a mandrel.
- the mandrel 1 provided in the plug for well excavation of the present invention is usually also referred to as a “core metal”, has a substantially circular cross section, and is sufficiently long with respect to the diameter of the cross section. It is a member that basically ensures the strength of the well drilling plug.
- the mandrel 1 provided in the plug for well drilling of the present invention has a cross-sectional diameter appropriately selected according to the size of the well bore (by slightly smaller than the borehole inner diameter,
- the diameter of the annular rubber member 5 that can be expanded is such that the borehole can be closed by expanding the diameter, etc.).
- the diameter is, for example, about 5 to 20 times, but is not limited thereto.
- the diameter of the cross section of the mandrel 1 is in the range of about 5 to 30 cm.
- the mandrel 1 provided in the plug for well excavation of the present invention may be solid, but from the viewpoint of securing the flow path at the initial stage of fracturing, reducing the weight of the mandrel, controlling the decomposition speed of the mandrel, etc.
- the hollow mandrel has at least a portion of a hollow portion along the axial direction (that is, the hollow portion may penetrate the mandrel 1 along the axial direction or the mandrel 1 along the axial direction). And may not penetrate.)
- the mandrel 1 has a hollow portion along the axial direction.
- the cross-sectional shape of the mandrel 1 defines the diameter (outer diameter) of the mandrel 1 and the outer diameter of the hollow portion (corresponding to the inner diameter of the mandrel 1). It is an annular shape formed by two concentric circles.
- the ratio of the diameters of the two concentric circles that is, the ratio of the outer diameter of the hollow portion to the diameter of the mandrel 1 is preferably 0.7 or less. Since the size of this ratio is in conflict with the size of the ratio of the thickness of the hollow mandrel 1 to the diameter of the mandrel 1, determining the upper limit of the ratio determines the preferable lower limit of the thickness of the hollow mandrel.
- the ratio of the outer diameter of the hollow portion to the diameter of the mandrel 1 is more preferably 0.6 or less, and even more preferably 0.5 or less.
- the diameter of the mandrel 1 and / or the outer diameter of the hollow portion may be uniform along the axial direction of the mandrel 1 or may vary along the axial direction. That is, by changing the outer diameter of the mandrel 1 along the axial direction, a convex part, a step part, a flange part, a concave part (groove part) on the outer peripheral surface of the mandrel 1 and a screw part (usually a male screw structure). Or a bent portion such as a meshing portion of a ratchet mechanism which will be described later.
- the outer diameter of the hollow portion (the inner diameter of the hollow mandrel 1) changes along the axial direction
- a convex portion, a step portion, a groove portion, and a screw portion (a male screw structure or a female screw) are formed on the inner peripheral surface of the mandrel 1. It is good also as what has bending parts, such as a structure. Further, the bent portion may have a tapered portion.
- the convex portion, stepped portion, flange portion and concave portion (groove portion) on the outer peripheral surface and / or inner peripheral surface of the mandrel 1 can also be used as a support part when the well drilling plug is transferred in the well. Moreover, it can also utilize as a site
- the outer peripheral surface of the mandrel 1 is allowed to move in one direction along the axial direction of the mandrel in cooperation with the inner peripheral surface of the member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel 1.
- a plurality of meshing portions that restrict movement in the opposite direction may be formed to constitute a ring-shaped ratchet mechanism that is orthogonal to the axial direction of the mandrel.
- the material forming the mandrel 1 provided in the plug for well excavation of the present invention is not particularly limited, and a material conventionally used as a material forming the mandrel provided in the plug for well excavation may be used. it can.
- metal materials aluminum, steel, stainless steel, etc.
- fibers wood, composite materials and resins
- composite materials containing reinforcing materials such as carbon fibers, particularly epoxy resins.
- composite materials containing polymers such as phenol resins.
- the plug for well excavation of the present invention is a plug for well excavation that can reduce the cost of well drilling and shorten the process by facilitating the removal and securing the flow path after fracturing. Therefore, the mandrel 1 is preferably formed from a degradable material.
- the degradable material may be a biodegradable or hydrolyzable degradable material, or any other method. Degradable materials that can be chemically degraded can be used.
- a material that is physically decomposed such as broken or collapsed by applying a large mechanical force such as a metal material such as aluminum that has been widely used as a mandrel provided in a well drilling plug, is provided by the present invention.
- a metal material such as aluminum that has been widely used as a mandrel provided in a well drilling plug
- This does not correspond to the degradable material forming the mandrel 1 provided in the plug for well drilling.
- the strength of the original resin is reduced due to a decrease in the degree of polymerization and the like, resulting in brittleness.
- the material that easily disintegrates and loses its shape corresponds to the degradable material.
- the mandrel 1 when the mandrel 1 is formed from a degradable material, it is preferably a hydrolyzable material that is decomposed by water at a predetermined temperature or more as described in detail later.
- the degradable material is more preferably an aliphatic polyester, and further preferably polyglycolic acid (hereinafter sometimes referred to as “PGA”). That is, a well drilling plug in which the mandrel 1 is formed of PGA is desirable.
- the decomposable material may contain a reinforcing material, or may contain other compounding components.
- the radius of curvature of the bent portion of the mandrel 1 can be 0.5 to 50 mm.
- the plug for well drilling according to the present invention is bent under the condition that the radius of curvature of the bent portion in the mandrel 1 is in the above range, so that the mining conditions such as deepening become increasingly severe and diverse.
- the plug for well excavation of the present invention is a plug for well excavation comprising a mandrel and a member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel. is there. That is, in the well drilling plug, the outer peripheral surface of the mandrel is usually used for the purpose of efficiently and surely transporting the plug, blocking the well hole, and fracturing, and further improving the handling property. Various members are mounted on the top.
- these various members include a member attached on the outer peripheral surface perpendicular to the axial direction of the mandrel, a member attached on the outer peripheral surface along the axial direction of the mandrel, and other directions along the axial direction of the mandrel.
- at least one of a mandrel or a member attached to an outer peripheral surface perpendicular to the axial direction of the mandrel (hereinafter, also referred to as “an outer peripheral surface attaching member”) is formed of a degradable material,
- the radius of curvature of the bent portion may be 0.5 to 50 mm.
- the plug for well excavation according to the present invention has the above-described characteristics with respect to the mounting member on the outer peripheral surface, so that the mining conditions such as an increase in depth become increasingly severe and diverse, and the plug is applied to the bent portion.
- Expenses for well drilling by reducing the load of heavy loads, reliably transferring in the well, blocking and fracturing the well, and making it easy to remove and secure the flow path It is a plug for well drilling that can reduce or shorten the process.
- the mounting member on the outer peripheral surface is not particularly limited as long as it is a member conventionally used in a plug for well excavation, and includes a slip, a wedge, a pair of ring-shaped fixing members, and an annular rubber capable of expanding the diameter.
- Preferred is at least one selected from the group consisting of members. These members are referred to as members in the sense that they include attachment members for attaching the respective members to the mandrel.
- slip and wedge Combinations of slips 2a, 2b and wedges 3a, 3b (in FIGS. 1A and 1B, combinations of slip 2a and wedge 3a, and combinations of slip 2b and wedge 3b, combinations of two slips and wedges
- the combination of the slip and the wedge provided in the well drilling plug may be one or plural.
- Such plugs are well known per se.
- slips 2a and 2b formed of a material such as a metal, an inorganic material, and a resin are slidably placed on the upper surfaces of the slopes of wedges 3a and 3b formed of a material such as a resin composite material, and the wedge
- the slips 2a and 2b ride on the upper surfaces of the slopes of the wedges 3a and 3b and move outwardly perpendicular to the axial direction of the mandrel 1.
- the outermost peripheral surface orthogonal to the axial direction of the mandrel 1 of the slips 2a and 2b is in contact with the inner wall H of the well hole to fix the plug and the inner wall H of the well hole.
- the slips 2a and 2b have one or more protrusions on the abutting portion with the inner wall H of the well hole in order to further ensure the blockage (seal) of the space between the plug and the well hole.
- a bent portion such as a stepped portion, a groove portion, or a rough surface (notched) may be provided.
- slips 2a and 2b may be divided in advance into a predetermined number in the circumferential direction orthogonal to the axial direction of the mandrel 1, or may be divided into a predetermined number as shown in FIG. Instead, it may have a cut that ends in the middle from one end along the axial direction to the other end.
- the combination of at least one slip 2a, 2b and wedge 3a, 3b is made up of a pair of ring-shaped fixing members 4a, 4b so that the axial force of the mandrel 1 can be applied to the wedges 3a, 3b. It is preferred to be in between. That is, the pair of ring-shaped fixing members 4a and 4b are configured to be able to slide along the axial direction of the mandrel 1 on the outer peripheral surface of the mandrel 1 and to change the mutual interval. The axial force of the mandrel 1 can be applied to the wedges 3a and 3b by directly or indirectly contacting the end portions along the axial direction of the wedges 3a and 3b.
- each of the pair of ring-shaped fixing members 4a and 4b are not particularly limited as long as they can fulfill the above-described functions.
- the axial force of the mandrel 1 is applied to the wedges 3a and 3b.
- each end surface of the pair of ring-shaped fixing members 4a, 4b on the side in contact with the wedges 3a, 3b is planar.
- Each ring-shaped fixing member of the pair of ring-shaped fixing members 4a and 4b is preferably an annular member that completely surrounds the outer peripheral surface of the mandrel 1, but may have a cut or a deformed portion in the circumferential direction.
- a ring having a shape separated in the circumferential direction
- a ring may be formed if desired.
- Each of the ring-shaped fixing members of the pair of ring-shaped fixing members 4a and 4b has a wide ring shape (the axial length of the mandrel 1 is large) by placing a plurality of rings adjacent to each other in the axial direction. It can also be a fixing member.
- the pair of ring-shaped fixing members 4a and 4b may have the same or similar composition, shape, and structure, or may have different compositions, shapes, and structures.
- each ring-shaped fixing member may have a different length and outer diameter in the axial direction of the mandrel 1.
- one ring-shaped fixing member of the pair of ring-shaped fixing members 4a and 4b can be configured to be unable to slide with respect to the mandrel 1 as desired.
- the other ring-shaped fixing member of the pair of ring-shaped fixing members 4a, 4b slides on the outer peripheral surface of the mandrel 1, whereby each of the pair of ring-shaped fixing members 4a, 4b is fixed in a ring shape.
- the members abut on the end portions along the axial direction of the wedges 3a and 3b, respectively.
- the configuration in which one ring-shaped fixing member of the pair of ring-shaped fixing members 4a and 4b cannot slide with respect to the mandrel 1 as desired is not particularly limited.
- the mandrel 1 and one ring-shaped fixing member of the pair of ring-shaped fixing members 4a and 4b are integrally formed (in this case, the ring-shaped fixing member is the mandrel 1).
- a clutch structure such as a dog clutch or a fitting structure shall be used (in this case, sliding with respect to the mandrel 1)
- a mandrel formed of a degradable material has a male screw structure on the outer peripheral surface, and one of the pair of ring-shaped fixing members faces the male screw structure.
- a structure is provided on the inner peripheral surface, and one of the pair of ring-shaped fixing members is fixed in a state where it cannot slide in the axial direction of the mandrel. Door can be.
- a well drilling plug in which the mandrel 1 and one ring-shaped fixing member of the pair of ring-shaped fixing members 4a and 4b are integrally formed, a well drilling plug formed by integral molding, or A well drilling plug formed by machining is provided.
- the well excavation plug may include a plurality of pairs of the ring-shaped fixing members 4a and 4b.
- a combination of the slips 2a, 2b and the wedges 3a, 3b and / or one or more of the diameter-expandable annular rubber members 5 which will be described in detail later are separately or combined to form a plurality of pairs. It can also be placed at a position between the ring-shaped fixing members 4a and 4b.
- the well excavation plug is on the outer peripheral surface perpendicular to the axial direction of the mandrel 1 and at least one annular rubber member 5 capable of expanding the diameter at a position between the pair of ring-shaped fixing members 4a, 4b.
- the pair of ring-shaped fixing members 4a and 4b described above fix the annular rubber member 5 whose diameter can be expanded, which is mounted on the outer peripheral surface orthogonal to the axial direction of the mandrel 1, in a compressed state. It can be.
- the ring-shaped rubber member 5 capable of expanding the diameter transmits the axial force of the mandrel 1 on the outer peripheral surface of the mandrel 1 by directly or indirectly contacting the pair of ring-shaped fixing members 4a and 4b.
- the mandrel 1 is compressed in the axial direction, and the diameter in the direction orthogonal to the axial direction of the mandrel 1 is increased as the axial distance is reduced (reduced diameter).
- the annular rubber member 5 is expanded in diameter so that the outer portion in the direction orthogonal to the axial direction contacts the inner wall H of the well hole and the inner portion in the direction orthogonal to the axial direction is the outer periphery of the mandrel 1.
- the ring-shaped rubber member 5 capable of expanding the diameter is fixed in a compressed state by a pair of ring-shaped fixing members 4a and 4b, and is maintained in contact with the inner wall H of the well hole while fracturing is performed. And has a function of maintaining a seal between the plug and the well hole.
- the diameter-expandable annular rubber member 5 has the above-described function, there is no limitation on its material, shape and structure.
- the annular rubber member 5 having a reverse U-shaped cross section in the circumferential direction orthogonal to the axial direction of the mandrel 1 is used, the U-shaped tip portion is compressed in the axial direction of the mandrel 1.
- the diameter can be increased toward the apex of the inverted U shape.
- the ring-shaped rubber member 5 capable of expanding the diameter abuts against the inner wall H of the well hole when the diameter is expanded and closes (seal) the space between the plug and the well hole.
- the axial length of the mandrel 1 is preferably 10 to 70%, more preferably 15 to 65% with respect to the length of the mandrel 1.
- the well excavation plug of the present invention has a sufficient sealing function and can also function to assist the fixing of the well hole and the plug after sealing.
- the well drilling plug can be provided with a plurality of annular rubber members 5 that can be expanded in diameter, whereby the space between the plug and the well hole can be closed (sealed) at a plurality of positions.
- the function of assisting in fixing the well hole and the plug can be more reliably performed.
- the well drilling plug includes a plurality of annular rubber members 5 capable of expanding the diameter
- the composition, shape or structure of the plurality of annular rubber members 5 capable of expanding the diameter the position of the mandrel 1 in the axial direction, and a pair of The relative positional relationship with the ring-shaped fixing members 4a and 4b can be selected as appropriate.
- the ring-shaped rubber member 5 capable of expanding the diameter is required not to lose the sealing function even in contact with a further high pressure or fracturing fluid accompanying fracturing in a high temperature and high pressure environment in a deep underground. Therefore, a rubber material excellent in heat resistance, oil resistance and water resistance is usually preferable, and for example, nitrile rubber, hydrogenated nitrile rubber, acrylic rubber and the like are often used. Further, the ring-shaped rubber member 5 capable of expanding the diameter may be, for example, rubber having a structure formed of a plurality of rubber members such as laminated rubber, or may have a structure in which other members are laminated.
- the inner wall H of the well hole may be provided with one or more bent portions such as a convex portion, a step portion, a groove portion, and a rough surface (notched).
- the material forming the outer peripheral surface mounting member provided in the plug for well excavation of the present invention is not particularly limited, and a material conventionally used as a material for forming the member provided in the plug for well excavation is used.
- a material conventionally used as a material for forming the member provided in the plug for well excavation is used.
- metal materials aluminum, steel, stainless steel, etc.
- fibers, wood, composite materials and resins can be mentioned.
- composite materials containing reinforcing materials such as carbon fibers, particularly epoxy resins.
- composite materials containing polymers such as phenol resins.
- the plug for well excavation of the present invention is a plug for well excavation that can reduce the cost of well drilling and shorten the process by facilitating the removal and securing the flow path after fracturing.
- at least one of the outer peripheral surface mounting members is formed of a degradable material.
- the degradable material in the plug for well excavation of the present invention, as the degradable material forming at least one of the mounting members on the outer peripheral surface, the degradable material having biodegradability and hydrolyzability as described in the mandrel above.
- degradable materials that can be chemically decomposed by some other method can be used.
- the well excavation plug of the present invention when at least one of the outer peripheral surface mounting members is formed from a degradable material, a large load is applied to the bent portion of the outer peripheral surface mounting member formed from the degradable material.
- the radius of curvature of the bent portion of the mounting member on the outer peripheral surface shall be 0.5 to 50 mm from the viewpoint of reducing the load on the well and reliably carrying out the transfer in the well, blocking the well hole, and fracturing. Can do.
- the plug for well excavation of the present invention is such that the curvature radius of the bent portion of the mounting member on the outer peripheral surface is in the above range, so that the mining conditions such as deepening are becoming more severe and diverse.
- the transition portion (where the outer diameter of the mounting member on the outer peripheral surface gradually changes to form the bent portion) becomes longer. In some cases, a bent portion having a desired shape and position cannot be formed.
- the plug for well excavation provided with the mandrel of the present invention and the outer peripheral surface mounting member has at least one of the mandrel or the outer peripheral surface mounting member formed of a degradable material, and the curvature of the bent portion.
- the radius is 0.5 to 50 mm.
- the decomposable material will be described in detail below.
- the degradable material forming at least one of the mandrel or the outer peripheral mounting member of the present invention is, for example, biodegradable that is degraded by microorganisms in the soil in which the fracturing fluid is used, or in the fracturing fluid
- it is a hydrolyzable material that decomposes with water at a predetermined temperature or higher.
- materials that physically break down such as destruction and collapse by applying a large mechanical force such as metal materials such as aluminum, which have been widely used in well drilling plugs, are degradable.
- metal materials such as aluminum, which have been widely used in well drilling plugs
- the strength of the original resin decreased due to a decrease in the degree of polymerization, etc., resulting in brittleness.
- a material that easily collapses and loses its shape by applying an appropriate force corresponds to the degradable material.
- the decomposable material forming at least one of the mandrel or the outer peripheral surface mounting member of the present invention is required to have a desired strength in a high-temperature and high-pressure environment in a deep underground and at the same time be excellent in decomposability. Therefore, a degradable resin is preferable.
- the degradable resin means a resin that can be chemically decomposed by biodegradability, hydrolyzability, and other methods as described above.
- Examples of the degradable resin include aliphatic polyesters such as polylactic acid, polyglycolic acid, poly- ⁇ -caprolactone, and polyvinyl alcohol (such as partially saponified polyvinyl alcohol having a saponification degree of about 80 to 95 mol%).
- the degradable material is preferably an aliphatic polyester.
- Decomposable resins can be used alone or in combination of two or more by blending or the like.
- the mounting member on the outer peripheral surface formed of a decomposable material is an annular rubber member capable of expanding the diameter
- examples of the decomposable material include aliphatic polyester rubber, polyurethane rubber, natural rubber, polyisoprene.
- Decomposable rubbers such as acrylic rubber, aliphatic polyester rubber, polyester-based thermoplastic elastomer, and polyamide-based thermoplastic elastomer can be used.
- the aliphatic polyester includes, for example, homopolymerization or copolymerization of oxycarboxylic acid and / or lactone, esterification reaction of aliphatic dicarboxylic acid and aliphatic diol, aliphatic dicarboxylic acid, aliphatic diol, oxycarboxylic acid and An aliphatic polyester obtained by copolymerization with lactone and / or one that dissolves rapidly in water at a temperature of about 20 to 100 ° C. is preferable.
- Examples of the oxycarboxylic acid include glycolic acid, lactic acid, malic acid, hydroxypropionic acid, hydroxybutyric acid, hydroxypentanoic acid, hydroxycaproic acid, hydroxyheptanoic acid, hydroxyoctanoic acid, and other aliphatic hydroxycarboxylic acids having 2 to 8 carbon atoms. Is mentioned.
- Examples of the lactone include lactones having 3 to 10 carbon atoms such as propiolactone, butyrolactone, valerolactone, and ⁇ -caprolactone.
- aliphatic dicarboxylic acid examples include aliphatic saturated dicarboxylic acids having 2 to 8 carbon atoms such as oxalic acid, malonic acid, succinic acid, glutaric acid and adipic acid, and aliphatic acids having 4 to 8 carbon atoms such as maleic acid and fumaric acid. And unsaturated dicarboxylic acid.
- Examples of the aliphatic diol include alkylene glycols having 2 to 6 carbon atoms such as ethylene glycol, propylene glycol, butanediol, and hexanediol, and polyalkylene glycols having 2 to 4 carbon atoms such as polyethylene glycol, polypropylene glycol, and polybutylene glycol. Can be mentioned.
- polyesters can be used alone or in combination of two or more. Moreover, as long as the property as a degradable resin is not lost, it can also be used combining the component which forms polyesters which are aromatic, such as terephthalic acid.
- aliphatic polyesters that are particularly preferred degradable resins include polycarboxylic acid-based aliphatic polyesters such as polylactic acid (hereinafter sometimes referred to as “PLA”) and PGA; poly- ⁇ -caprolactone (hereinafter referred to as “PCL”). Lactone aliphatic polyesters such as polyethylene succinates and polybutylene succinates; diol / dicarboxylic acid aliphatic polyesters such as polyethylene succinates; copolymers thereof such as glycolic acid / lactic acid copolymers (hereinafter referred to as , "PGLA”), as well as mixtures thereof. Moreover, the aliphatic polyester which combines and uses aromatic components, such as a polyethylene adipate / terephthalate, can also be mentioned.
- PHA polycarboxylic acid-based aliphatic polyesters
- PCL poly- ⁇ -caprolactone
- Lactone aliphatic polyesters such as polyethylene succinates and polybutylene
- the aliphatic polyester is most preferably at least one selected from the group consisting of PGA, PLA and PGLA, and more preferably PGA.
- the glycolic acid repeating unit is 50% by mass or more, preferably 75% by mass or more, more preferably 85% by mass or more, and still more preferably 90% by mass or more. It includes 95% by mass or more, most preferably 99% by mass or more, and particularly preferably 99.5% by mass or more of a copolymer.
- a repeating unit of L-lactic acid or D-lactic acid is 50% by mass or more, preferably 75% by mass or more, more preferably 85% by mass.
- a stereocomplex polylactic acid including a copolymer having 90% by mass or more, and obtained by mixing poly-L-lactic acid and poly-D-lactic acid may be used.
- the ratio (mass ratio) of glycolic acid repeating units to lactic acid repeating units is 99: 1 to 1:99, preferably 90:10 to 10:90, more preferably 80:20 to 20:80. Copolymers can be used.
- melt viscosity As the aliphatic polyester, preferably PGA, PLA or PGLA, those having a melt viscosity of usually 50 to 5000 Pa ⁇ s, preferably 150 to 3000 Pa ⁇ s, more preferably 300 to 1500 Pa ⁇ s can be used. The melt viscosity is measured at a temperature of 240 ° C. and a shear rate of 122 sec-1. If the melt viscosity is too small, the strength required for the mandrel provided in the well drilling plug may be insufficient.
- melt viscosity is too large, for example, a high melting temperature is required to produce a mandrel, and the aliphatic polyester may be thermally deteriorated or the decomposability may be insufficient.
- the melt viscosity is about 20 g of sample at a predetermined temperature (240 ° C.) using a capillograph (“Capillograph 1-C” manufactured by Toyo Seiki Seisakusyo Co., Ltd.) equipped with a capillary (diameter 1 mm ⁇ ⁇ length 10 mm). For 5 minutes, and then the measurement is performed under the condition of a shear rate of 122 sec ⁇ 1 .
- PGA which is a particularly preferred aliphatic polyester, has a weight average molecular weight of 180,000 to 300,000, a temperature of 270 ° C., a shear rate, for example, from the viewpoint of moldability such that cracking is less likely to occur during molding by solidification extrusion molding.
- PGA having a melt viscosity of 700 to 2000 Pa ⁇ s measured at 122 sec ⁇ 1 is more preferable.
- PGA having a weight average molecular weight of 190,000 to 240000, a temperature of 270 ° C., and a melt viscosity measured at a shear rate of 122 sec ⁇ 1 is 800 to 1200 Pa ⁇ s.
- the melt viscosity is measured according to the method described above (the measurement temperature is 270 ° C.).
- the weight average molecular weight is obtained by dissolving 10 mg of PGA sample in hexafluoroisopropanol (HFIP) in which sodium trifluoroacetate is dissolved at a concentration of 5 mM to 10 mL, and then filtering with a membrane filter. 10 ⁇ l of the sample solution was measured by gel permeation chromatography (GPC) under the following conditions.
- HFIP hexafluoroisopropanol
- a degradable material preferably a degradable resin, more preferably an aliphatic polyester, and even more preferably PGA, is a resin material (degradable material is degradable), as long as it does not impair the object of the present invention.
- a resin other additives such as other resins
- a stabilizer e.g., a stabilizer
- a decomposition accelerator or a decomposition inhibitor e.g., a a decomposition inhibitor
- a reinforcing material may be contained or blended.
- the degradable material preferably contains a reinforcing material.
- the degradable material can be referred to as a composite material.
- the degradable material is a degradable resin, it is a so-called reinforced resin.
- the mandrel or outer peripheral surface mounting member formed from a reinforced resin is preferably formed from an aliphatic polyester containing a reinforcing material.
- the reinforcing material As the reinforcing material, it is possible to use a material that has been conventionally used as a reinforcing material such as a resin material for the purpose of improving mechanical strength and heat resistance, such as a fibrous reinforcing material or a granular or powdered reinforcing material. Can be used.
- the reinforcing material can be contained in an amount of usually 150 parts by mass or less, preferably 10 to 100 parts by mass with respect to 100 parts by mass of a degradable material such as a degradable resin.
- fibrous reinforcing materials include glass fibers, carbon fibers, asbestos fibers, silica fibers, alumina fibers, zirconia fibers, boron nitride fibers, silicon nitride fibers, boron fibers, potassium titanate fibers, and the like; stainless steel, aluminum Metal fiber materials such as titanium, steel and brass; high melting point organic fiber materials such as aramid fiber, kenaf fiber, polyamide, fluororesin, polyester resin and acrylic resin; and the like.
- fibrous reinforcing material short fibers having a length of 10 mm or less, more preferably 1 to 6 mm, and further preferably 1.5 to 4 mm are preferable, inorganic fibrous materials are preferably used, and glass fibers are particularly preferable. preferable.
- Granular or powdery reinforcing materials include mica, silica, talc, alumina, kaolin, calcium sulfate, calcium carbonate, titanium oxide, ferrite, clay, glass powder, zinc oxide, nickel carbonate, iron oxide, quartz powder, magnesium carbonate, Barium sulfate or the like can be used.
- the reinforcing materials can be used alone or in combination of two or more.
- the reinforcing material may be treated with a sizing agent or a surface treatment agent as necessary.
- the mandrel or outer peripheral surface mounting member formed from a degradable material may be formed of a composite material of a degradable material and a metal or an inorganic material.
- a base material made of a degradable material such as a degradable resin such as PGA is provided with a recess such as a recess having a predetermined shape, and a metal (metal piece or the like) having a shape matching the shape of the recess or Examples include those in which an inorganic substance is inserted and fixed with an adhesive, or a metal piece or an inorganic substance and a base material are wound and fixed so as to maintain a fixed state.
- the radius of curvature of the bent portion In the well drilling plug including the mandrel of the present invention and the outer peripheral surface mounting member, at least one of the mandrel or the outer peripheral surface mounting member is formed of a degradable material, and the bent portion thereof
- the curvature radius is 0.5 to 50 mm. That is, the radius of curvature of the bent portion of the mandrel formed from the degradable material or the mounting member on the outer peripheral surface is 0.5 to 50 mm.
- the radius of curvature of at least one bent portion of the mandrel or the outer peripheral surface mounting member formed from the degradable material will be described in detail.
- the mandrel provided in the plug for well excavation, or an outer peripheral mounting member such as a slip, a wedge, a pair of ring-shaped fixing members, an annular rubber member capable of expanding the diameter, etc.
- bent portions such as convex portions, step portions, flange portions, and groove portions are provided. Further, these bent portions allow movement of the mandrel in one direction along the axial direction of the mandrel on the outer peripheral surface of the mandrel and the inner peripheral surface of the mounting member on the outer peripheral surface, and restrict movement in the opposite direction.
- a ring-shaped ratchet mechanism that forms a plurality of meshing portions and is orthogonal to the axial direction of the mandrel can be configured.
- the outer peripheral surface mounting member, the mounting member for mounting the outer peripheral surface mounting member to the mandrel, or the mandrel may be provided with a screw portion (male screw structure or female screw structure). Needless to say, there are threads and bent portions of the screw bottom. Therefore, the well excavation plug of the present invention has a mandrel formed from a degradable material or a curvature radius of a bent portion such as a convex portion, a step portion, a flange portion, a groove portion, a screw thread, and a screw bottom in an outer peripheral surface mounting member. Is 0.5 to 50 mm. Further, the mandrel formed of the decomposable material may include a meshing portion of a ratchet mechanism on the outer peripheral surface, and the curvature radius of the meshing portion may be 0.5 to 50 mm.
- the well excavation plug including the mandrel and the outer peripheral surface mounting member of the present invention allows the mandrel and the outer peripheral surface mounting member to jointly close the well and enable fracturing. Therefore, the mandrel and the mounting member on the outer peripheral surface provided in the plug for well drilling are subjected to a heavy load applied to the bent portion under the increasingly severe and diverse mining conditions such as deepening.
- the required mechanical properties tensile properties and / or compression
- a pressure of about several tons is applied to the closed space, and a tension pressure and / or a compression pressure corresponding to a high pressure is applied to the mounting member on the outer peripheral surface.
- stress concentration occurs at convex portions, stepped portions, groove portions, screw threads and screw bottoms, and bent portions such as flange portions and meshing portions of the ratchet mechanism, and a greater tensile pressure and / or compressive pressure is applied.
- the well drilling plug of the present invention has at least a part of the mandrel or the outer peripheral surface mounting member. Formed from degradable material. Compared with metal materials such as aluminum, which are conventionally used as materials for forming well drilling plugs, degradable materials such as degradable resins such as aliphatic polyester have mechanical properties under the environment in the wells. Often small. However, in the present invention, since the radius of curvature of the bent portion of the mandrel formed from the degradable material or the mounting member on the outer peripheral surface is 0.5 to 50 mm, it is necessary to prevent damage in the environment of the well.
- the curvature radius of the bent portion of the mandrel or outer peripheral surface mounting member formed from a degradable material is the minimum in the bent portion when the bent portion is composed of a plurality of curved surfaces having different curvature radii. Means the radius of curvature.
- the radius of curvature of the bent portion of the mandrel formed from the degradable material or the mounting member on the outer peripheral surface is preferably 1 to 40 mm, more preferably 3 to 36 mm, The range is preferably 5 to 32 mm.
- the mandrel formed from the degradable material or the mounting member on the outer peripheral surface formed from the degradable material has a plurality of bent portions, all the bent portions
- the radius of curvature may be 0.5 to 50 mm, but the radius of curvature of the bent portion to which a larger load is applied in the transfer in the well, blockage of the well hole, and fracturing is within the above range. There may be.
- the bent part of the mandrel formed from the degradable material or the mounting member on the outer peripheral surface is at least selected from the group consisting of a convex part, a step part, a flange part, a meshing part of a ratchet mechanism, a groove part, a screw thread, and a screw bottom.
- the height of the tapered portion is 1 mm or more, more preferably because the load of a large load may be reduced.
- the range is 2 to 50 mm, more preferably 3 to 45 mm, and particularly preferably 5 to 40 mm.
- a taper part means the length in alignment with the mandrel axial direction of the part except the part which has the minimum curvature radius in the bending part in the mandrel formed from a degradable material, or an outer peripheral surface attachment member.
- FIG. 2 is a schematic view of a specific example of a mandrel having a flange portion (thickness (A): 30 mm) as a bent portion formed from PGA which is a degradable resin.
- a round bar-like flange part having a large diameter is connected to a round bar-like (pipe-like) mandrel via a taper part having a radius of curvature Rmm and a height Tmm of the taper part.
- the upper end of the upper round bar is fixed, and a load of 45 kN is applied to the flange portion (corresponding to the tensile force caused by the pressure applied during fracturing).
- Table 1 shows the results of measuring the tensile stress (unit: MPa) applied to the flange portion while changing the radius of curvature R (unit: mm) and the height T (unit: mm) of the tapered portion.
- the mandrel having this flange portion can be used in a high-temperature environment at a high depth. It was inferred that the pressure applied to the well drilling plug would not cause damage.
- the taper part height is 10 or 20 mm. 3 and no. Since the maximum stress applied to the flange portion of 4 is even smaller at 31 MPa or less, the mandrel having this flange portion reliably ensures the pressure received by the well drilling plug even in a higher temperature environment at a higher depth. It was inferred that it could resist.
- the plug for well excavation of the present invention is a plug for well excavation provided with a mandrel and a mounting member on the outer peripheral surface, and at least one of the mandrel or the member is formed of a degradable material.
- the well excavation plug is characterized in that the radius of curvature of the bent portion is 0.5 to 50 mm.
- the well drilling plug of the present invention may further include other members that may be normally provided in a well drilling plug. For example, when the mandrel has a hollow portion along the axial direction, the ball is placed in the hollow portion and controls the flow of fluid (formed from a material such as metal or resin, and may be formed from a degradable material). Can be provided.
- a well drilling plug mandrel, an outer peripheral mounting member, and a member for coupling or releasing the other member to or from each other member, for example, a rotation stop member, etc. be able to.
- the plug for well excavation provided with the mandrel of the present invention and the mounting member on the outer peripheral surface may be all made of a degradable material.
- the plug for well excavation of the present invention applies a mandrel axial force to a pair of ring-shaped fixing members in the axial direction of the mandrel.
- Directional force is transmitted, and as a result, the diameter-expandable annular rubber member is compressed in the axial direction of the mandrel, and the axial distance is reduced (reduced diameter).
- the member expands in the direction perpendicular to the axial direction of the mandrel.
- the annular rubber member expands in diameter so that the outer portion in the direction orthogonal to the axial direction contacts the inner wall of the well hole and the inner portion in the direction orthogonal to the axial direction contacts the outer peripheral surface of the mandrel.
- the space between the plug and the well hole can be closed (seal) (blocking of the well hole).
- the slip rides on the upper surface of the slope of the wedge and moves outwardly perpendicular to the axial direction of the mandrel, and the outermost peripheral surface perpendicular to the axial direction of the mandrel of the slip contacts the inner wall of the wellbore.
- the plug can be fixed in place in the wellbore.
- fracturing can be performed in a state where the space between the plug and the well hole is closed (sealed).
- the well drilling plug according to the present invention is usually used after completion of fracturing of predetermined sections, when drilling of the well is completed and the well is completed, and production of oil, natural gas, etc. is started.
- at least one of a mandrel or an outer peripheral mounting member formed from a degradable material by biodegradation, hydrolysis, or chemical decomposition by some other method is optionally formed from the degradable material.
- the mandrel can be easily decomposed and removed, and hydrocarbon resources can be mined efficiently.
- the well drilling plug of the present invention conventionally, after completion of the well, a large number of well drilling plugs left in the well are removed, recovered, crushed, drilled or other methods, Many expenses and time required for destruction or fragmentation are not required, so that the cost of well drilling can be reduced and the process can be shortened.
- the well drilling plug of the present invention is a well drilling plug including a mandrel and an outer peripheral surface mounting member, and at least one of the mandrel or the member is a degradable material.
- the manufacturing method is not limited as long as the plug for well excavation, which is formed from the above and has a curvature radius of 0.5 to 50 mm, can be manufactured.
- each member provided in the plug for well excavation is molded by injection molding, extrusion molding (including solid extrusion molding), centrifugal molding, compression molding, or other known molding methods, and each member obtained is After machining such as cutting or drilling as necessary, a well drilling plug can be obtained by a combination of methods known per se.
- the well drilling plug of the present invention is a well drilling plug in which a mandrel formed from a degradable material and an outer peripheral surface mounting member formed from a degradable material are integrally formed, injection Formed from a decomposable material and a mandrel formed from a degradable material by integral molding by a molding method such as molding, extrusion molding (including solid extrusion molding), centrifugal molding, or by machining such as cutting. It is preferable to integrally form the mounting member on the outer peripheral surface.
- the present invention is a well drilling plug comprising a mandrel and a member mounted on an outer peripheral surface perpendicular to the axial direction of the mandrel, wherein the mandrel or at least one of the members is formed of a degradable material, and
- the well drilling plug is characterized by the curvature radius of the bent part being 0.5-50mm, and the mining conditions such as deepening are becoming increasingly severe and diverse. Therefore, it is possible to reduce the load of a large load applied to the bent portion, reliably transfer in the well, close the well hole and fracture, and facilitate the removal and securing of the flow path. Therefore, it is possible to provide a well drilling plug capable of reducing the cost of well drilling and shortening the process, so that the industrial applicability is high.
- the present invention provides a well drilling machine wherein a part or all of a well drilling plug is disassembled after performing a well hole sealing process using the well drilling plug.
- the well drilling method reduces the load of the heavy load on the bent part and makes sure that it is transported in the well well, while the mining conditions are becoming more severe and diverse, such as deepening. It is possible to provide a well drilling method capable of reducing the cost of well drilling and shortening the process by making it possible to close and fracture the well hole and facilitate the removal and securing of the flow path. So the industrial applicability is high.
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Abstract
Description
分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmである
ことを特徴とする坑井掘削用プラグが提供される。 That is, according to the first aspect of the present invention, (1) a well drilling plug comprising a mandrel and a member attached on an outer peripheral surface perpendicular to the axial direction of the mandrel, the mandrel or the member At least one
A well drilling plug is provided, which is formed of a degradable material and has a curvature radius of 0.5 to 50 mm at a bent portion thereof.
(3)1対のリング状固定部材が、マンドレルの軸方向に直交する外周面上に取り付けられる拡径可能な環状のゴム部材を圧縮状態のまま固定することができるものである前記(2)の坑井掘削用プラグ。
(4)少なくとも1つのスリップとウエッジとの組み合わせが、1対のリング状固定部材の間に置かれる前記(2)または(3)の坑井掘削用プラグ。
(5)分解性材料から形成されるマンドレルの軸方向に直交する外周面上に取り付けられる部材が、分解性材料と金属または無機物との複合材により形成される前記(1)~(4)のいずれかの坑井掘削用プラグ。
(6)マンドレルが、分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmである前記(1)~(5)のいずれかの坑井掘削用プラグ。
(7)分解性材料から形成されるマンドレルが、軸方向に沿う中空部を有する前記(6)の坑井掘削用プラグ。
(8)分解性材料から形成されるマンドレルと、分解性材料から形成されるマンドレルの軸方向に直交する外周面上に取り付けられる部材とが一体に形成されている前記(6)または(7)の坑井掘削用プラグ。
(9)一体成形により一体に形成されている前記(8)の坑井掘削用プラグ。
(10)機械加工により一体に形成されている前記(8)の坑井掘削用プラグ。
(11)曲折部分が、凸部、段部、フランジ部、溝部、ねじ山及びねじ底からなる群より選ばれる少なくとも1つである前記(1)~(10)のいずれかの坑井掘削用プラグ。
(12)曲折部分が、更にテーパー部を有し、テーパー部の高さが1mm以上である前記(11)の坑井掘削用プラグ。
(13)分解性材料が、脂肪族ポリエステルである前記(1)~(12)のいずれかの坑井掘削用プラグ。
(14)脂肪族ポリエステルが、ポリグリコール酸である前記(13)の坑井掘削用プラグ。
(15)ポリグリコール酸が、重量平均分子量が180000~300000、かつ、温度270℃、せん断速度122sec-1で測定した溶融粘度が700~2000Pa・sである前記(14)の坑井掘削用プラグ。
(16)分解性材料が、強化材を含有する前記(1)~(15)のいずれかの坑井掘削用プラグ。
(17)マンドレルが、ポリグリコール酸から形成される前記(1)~(16)のいずれかの坑井掘削用プラグ。
(18)分解性材料から形成されるマンドレルが、外周面にラチェット機構のかみ合い部を備え、該かみ合い部の曲率半径が0.5~50mmである前記(1)~(17)のいずれかの坑井掘削用プラグ。
(19)分解性材料から形成されるマンドレルが、外周面に雄ねじ構造を備え、1対のリング状固定部材の一方が、該雄ねじ構造と対向する雌ねじ構造をその内周面に備え、かつ、前記1対のリング状固定部材の一方は、前記マンドレルの軸方向に摺動することができない状態に固定されている前記(1)~(18)のいずれかの坑井掘削用プラグ。 (2) At least one member selected from the group consisting of a slip, a wedge, a pair of ring-shaped fixing members, and a ring-shaped rubber member capable of expanding the diameter is attached to the outer peripheral surface orthogonal to the axial direction of the mandrel. The plug for well excavation according to (1) above.
(3) The pair of ring-shaped fixing members can fix an expandable ring-shaped rubber member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel in a compressed state (2) Plug for well drilling.
(4) The well drilling plug according to (2) or (3), wherein a combination of at least one slip and a wedge is placed between a pair of ring-shaped fixing members.
(5) The member (1) to (4), wherein the member attached on the outer peripheral surface perpendicular to the axial direction of the mandrel formed of the decomposable material is formed of a composite material of the decomposable material and a metal or an inorganic substance. Any well drilling plug.
(6) The well excavation plug according to any one of (1) to (5), wherein the mandrel is formed of a degradable material, and the curvature radius of the bent portion is 0.5 to 50 mm.
(7) The well drilling plug according to (6), wherein the mandrel formed of a degradable material has a hollow portion along the axial direction.
(8) The above (6) or (7), wherein the mandrel formed from the degradable material and the member attached on the outer peripheral surface perpendicular to the axial direction of the mandrel formed from the degradable material are integrally formed. Plug for well drilling.
(9) The well excavation plug according to (8), which is integrally formed by integral molding.
(10) The well excavation plug according to (8), which is integrally formed by machining.
(11) For well drilling according to any one of (1) to (10), wherein the bent portion is at least one selected from the group consisting of a convex portion, a step portion, a flange portion, a groove portion, a screw thread, and a screw bottom. plug.
(12) The well excavation plug according to (11), wherein the bent portion further has a tapered portion, and the height of the tapered portion is 1 mm or more.
(13) The well drilling plug according to any one of (1) to (12), wherein the degradable material is aliphatic polyester.
(14) The well drilling plug according to (13), wherein the aliphatic polyester is polyglycolic acid.
(15) The plug for well excavation according to (14), wherein the polyglycolic acid has a weight average molecular weight of 180,000 to 300,000, a melt viscosity of 700 to 2000 Pa · s measured at a temperature of 270 ° C. and a shear rate of 122 sec −1. .
(16) The well excavation plug according to any one of (1) to (15), wherein the degradable material contains a reinforcing material.
(17) The well drilling plug according to any one of (1) to (16), wherein the mandrel is formed of polyglycolic acid.
(18) The mandrel formed of a degradable material has an engagement portion of a ratchet mechanism on the outer peripheral surface, and the curvature radius of the engagement portion is 0.5 to 50 mm, any of (1) to (17) Plug for well drilling.
(19) The mandrel formed of a degradable material has a male screw structure on the outer peripheral surface, and one of the pair of ring-shaped fixing members has a female screw structure facing the male screw structure on the inner peripheral surface, and One of the pair of ring-shaped fixing members is a plug for well excavation according to any one of (1) to (18), wherein the plug is fixed so that it cannot slide in the axial direction of the mandrel.
1.マンドレル
本発明の坑井掘削用プラグは、マンドレルと、マンドレルの軸方向に直交する外周面上に取り付けられる部材とを備える坑井掘削用プラグである。本発明の坑井掘削用プラグが備えるマンドレル1は、通常「芯金」とも称されるものであって、断面が略円形状で、断面の直径に対して長さが十分大きく、本発明の坑井掘削用プラグの強度を基本的に担保する部材である。本発明の坑井掘削用プラグに備えられるマンドレル1は、断面の直径が、坑井孔の大きさに応じて適宜選択され(坑井孔の内径より僅かに小さいことにより、坑井孔内を移動可能であり、一方、後述するように拡径可能な環状ゴム部材5の拡径等により坑井孔の閉塞が可能となる程度の径の差を有する。)、その長さは、断面の直径に対して、例えば5~20倍程度であるが、これに限定されるものではない。通常、マンドレル1の断面の直径は、5~30cm程度の範囲である。 I. Plug for
本発明の坑井掘削用プラグに備えられるマンドレル1は、中実のものでもよいが、フラクチャリング初期の流路確保、マンドレルの重量の軽減、マンドレルの分解速度の制御などの観点から、マンドレル1が、軸方向に沿う中空部を少なくとも一部に有する中空マンドレルであることが好ましい(すなわち、中空部は、マンドレル1を軸方向に沿って貫通してもよいし、マンドレル1を軸方向に沿って貫通しないものでもよい。)。また、流体を用いて坑井掘削用プラグ坑井内に押し込み移送する場合には、マンドレル1が、軸方向に沿う中空部を有することが好ましい。マンドレル1が軸方向に沿う中空部を有するものである場合、マンドレル1の断面形状は、マンドレル1の直径(外径)及び中空部の外径(マンドレル1の内径に相当する。)を画成する2つの同心円で形成される円環状である。2つの同心円の径の比率、すなわち、マンドレル1の直径に対する中空部の外径の比率が0.7以下であることが好ましい。この比率の大小は、マンドレル1の直径に対する中空マンドレル1の肉厚の比率の大小と相反する関係にあるので、その比率の上限値を定めることは、中空マンドレルの肉厚の好ましい下限値を定めることに相当するということができる。中空マンドレルの肉厚が薄すぎると、坑井掘削用プラグを坑井孔内に配置したり、坑井孔の閉塞やフラクチャリングを行うときに、中空マンドレルの強度(特に引張強度)が不足して、極端な場合には坑井掘削用プラグが損傷することがある。したがって、マンドレル1の直径に対する中空部の外径の比率は、より好ましくは0.6以下、更に好ましくは0.5以下である。 (Hollow part)
The
本発明の坑井掘削用プラグに備えられるマンドレル1を形成する材料は、特に限定されず、従来、坑井掘削用プラグに備えられるマンドレルを形成する材料として使用されている材料を使用することができる。例えば、金属材料(アルミニウム、スチール、ステンレス鋼等)、繊維、木、複合材及び樹脂などを挙げることができ、具体的には、炭素繊維等の強化材を含有する複合材、特に、エポキシ樹脂やフェノール樹脂等の重合体を含有する複合材などを挙げることができる。本発明の坑井掘削用プラグは、フラクチャリングを行った後には、その除去や流路の確保を容易にすることにより坑井掘削の経費軽減や工程短縮ができる坑井掘削用プラグであることから、マンドレル1が分解性材料から形成されるものであることが好ましい。 [Materials for forming mandrels]
The material forming the
本発明の坑井掘削用プラグにおいて、マンドレル1が分解性材料から形成されるものである場合、分解性材料としては、生分解性、加水分解性を有する分解性材料、更に他の何らかの方法によって化学的に分解することができる分解性材料を使用することができる。 (Degradable material)
In the well excavation plug of the present invention, when the
本発明の坑井掘削用プラグにおいて、マンドレル1が分解性材料から形成されるものである場合、曲折部分にかかる大荷重の負荷を軽減して、確実に坑井内における移送、坑井孔の閉塞及びフラクチャリングを行う観点から、マンドレル1における曲折部分の曲率半径が0.5~50mmであるものとすることができる。本発明の坑井掘削用プラグは、マンドレル1における曲折部分の曲率半径が上記の範囲であることにより、高深度化など採掘条件がますます過酷かつ多様なものとなっているもとで、曲折部分にかかる大荷重の負荷を軽減して、確実に坑井内における移送、坑井孔の閉塞及びフラクチャリングを行うことができ、かつ、その除去や流路の確保を容易にすることにより坑井掘削の経費軽減や工程短縮ができる坑井掘削用プラグである。すなわち、分解性材料から形成されるマンドレル1における曲折部分の曲率半径が小さすぎると、該曲折部分が、坑井内における移送、坑井孔の閉塞及びフラクチャリングに負荷される高圧力により破損するおそれがある。分解性材料から形成されるマンドレル1における曲折部分の曲率半径が大きすぎると、移行部(曲折部分を形成するためにマンドレル1の外径または内径が漸次変化する箇所)が長くなりすぎて所望の形状及び位置の曲折部分を形成できない場合がある。 [Curve radius of bent part]
In the well drilling plug of the present invention, when the
本発明の坑井掘削用プラグは、マンドレルと、マンドレルの軸方向に直交する外周面上に取り付けられる部材とを備える坑井掘削用プラグである。すなわち、坑井掘削用プラグにおいて、該プラグの移送、坑井孔の閉塞及びフラクチャリングを効率的かつ確実に行うため、更に、取扱い性を改善するためなどの目的で、通常、マンドレルの外周面上に種々の部材が取り付けられる。それら種々の部材としては、マンドレルの軸方向に直交する外周面上に取り付けられる部材、マンドレルの軸方向に沿う外周面上に取り付けられる部材、及び、マンドレルの軸方向に対してその他の方向に沿う外周面上に取り付けられる部材などがある。本発明は、マンドレル、または、マンドレルの軸方向に直交する外周面上に取り付けられる部材(以下、「外周面上取付部材」ということがある。)の少なくとも1つが、分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmであることを特徴とするものとすることができる。 2. The member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel The plug for well excavation of the present invention is a plug for well excavation comprising a mandrel and a member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel. is there. That is, in the well drilling plug, the outer peripheral surface of the mandrel is usually used for the purpose of efficiently and surely transporting the plug, blocking the well hole, and fracturing, and further improving the handling property. Various members are mounted on the top. These various members include a member attached on the outer peripheral surface perpendicular to the axial direction of the mandrel, a member attached on the outer peripheral surface along the axial direction of the mandrel, and other directions along the axial direction of the mandrel. There are members attached on the outer peripheral surface. In the present invention, at least one of a mandrel or a member attached to an outer peripheral surface perpendicular to the axial direction of the mandrel (hereinafter, also referred to as “an outer peripheral surface attaching member”) is formed of a degradable material, In addition, the radius of curvature of the bent portion may be 0.5 to 50 mm.
スリップ2a、2bとウエッジ3a、3bとの組み合わせ(図1A、図1Bにおいては、スリップ2aとウエッジ3aとの組み合わせ、及び、スリップ2bとウエッジ3bとの組み合わせとして、2つのスリップとウエッジとの組み合わせが示されているが、坑井掘削用プラグに備えられるスリップとウエッジとの組み合わせは1つでもよいし、複数でもよい。)は、プラグと坑井孔との固定を行う手段として、坑井掘削用プラグにおいてそれ自体周知のものである。すなわち、金属、無機物、樹脂等の材料により形成されるスリップ2a、2bが、樹脂複合材等の材料により形成されるウエッジ3a、3bの斜面の上面に摺動可能に接触して置かれ、ウエッジ3a、3bが、マンドレル1の軸方向の力が加えられて移動することによって、スリップ2a、2bがウエッジ3a、3bの斜面の上面に乗り上げてマンドレル1の軸方向と直交する外方に移動し、該スリップ2a、2bのマンドレル1の軸方向と直交する最外方の周面が、坑井孔の内壁Hに当接して、プラグと坑井孔の内壁Hとの固定を行う。スリップ2a、2bには、プラグと坑井孔との間の空間の閉塞(シール)を一層確実なものとするために、坑井孔の内壁Hとの当接部に、1以上の凸部、段部、溝部、粗面(ギザギザ)などの曲折部分が設けられることがある。また、スリップ2a、2bは、予めマンドレル1の軸方向に直交する円周方向において所定の数に分割されているものでもよいし、図1に示すように、予め所定の数に分割されてはおらず、軸方向に沿う一端部から他端部に向かい途中で終了する切れ目を有するものでもよい。なお、この場合は、ウエッジ3a、3bにマンドレル1の軸方向の力が加えられて、ウエッジ3a、3bがスリップ2a、2bの下面に進入することにより、スリップ2a、2bが、前記の切れ目及びその延長線に沿って割られて分割し、次いで各分割片がマンドレル1の軸方向と直交する外方に移動するが、それ自体は周知の構造である。 [Slip and wedge]
Combinations of
ウエッジ3a、3bにマンドレル1の軸方向の力を加え移動させることができるように、少なくとも1つのスリップ2a、2bとウエッジ3a、3bとの組み合わせが、1対のリング状固定部材4a、4bの間に置かれることが好ましい。すなわち、1対のリング状固定部材4a、4bは、マンドレル1の外周面上においてマンドレル1の軸方向に沿って摺動が可能で、相互の間隔を変更することができるように構成されており、ウエッジ3a、3bの軸方向に沿う端部に、直接または間接的に当接することにより、これらにマンドレル1の軸方向の力を加えることができるように構成されている。1対のリング状固定部材4a、4bの各々の形状や大きさは、上記した機能を果たすことができる限り、特に制限されないが、ウエッジ3a、3bに対して、マンドレル1の軸方向の力を有効に加えることができる観点から、1対のリング状固定部材4a、4bのウエッジ3a、3bに当接する側の各々の端面を平面状とすることが好ましい。1対のリング状固定部材4a、4bの各々のリング状固定部材は、マンドレル1の外周面を完全に取り囲む円環状のものが好ましいが、周方向に切れ目や変形箇所を有するものでもよい。また、円環を周方向に分離した形状のものとして、所望により円環を形成するようにしたものでもよい。1対のリング状固定部材4a、4bの各々のリング状固定部材は、複数のリングを軸方向に隣接して置くことにより、幅広の(マンドレル1の軸方向の長さが大きい。)リング状固定部材とすることもできる。 [A pair of ring-shaped fixing members]
The combination of at least one
坑井掘削用プラグは、マンドレル1の軸方向と直交する外周面上であって、1対のリング状固定部材4a、4bの間の位置に、少なくとも1つの拡径可能な環状のゴム部材5を備えるものとすることができる。好ましくは、先に説明した1対のリング状固定部材4a、4bが、マンドレル1の軸方向に直交する外周面上に取り付けられる拡径可能な環状のゴム部材5を圧縮状態のまま固定するものとすることができる。すなわち、拡径可能な環状のゴム部材5は、1対のリング状固定部材4a、4bに直接または間接的に当接することにより、マンドレル1の外周面上においてマンドレル1の軸方向の力を伝達され、その結果、マンドレル1の軸方向に圧縮され、軸方向の距離が縮小(縮径)することに伴い、マンドレル1の軸方向に直交する方向に拡径する。該環状のゴム部材5は、拡径して、軸方向に直交する方向の外方部が坑井孔の内壁Hと当接するとともに、軸方向に直交する方向の内方部がマンドレル1の外周面に当接することにより、プラグと坑井孔との間の空間を閉塞(シール)するものである。拡径可能な環状のゴム部材5は、1対のリング状固定部材4a、4bによって圧縮状態のまま固定され、フラクチャリングが遂行されている間、坑井孔の内壁Hと当接状態を維持することができ、プラグと坑井孔とのシールを維持する機能を有するものである。 [A ring-shaped rubber member that can be expanded]
The well excavation plug is on the outer peripheral surface perpendicular to the axial direction of the
本発明の坑井掘削用プラグに備えられる外周面上取付部材を形成する材料は、特に限定されず、従来、坑井掘削用プラグに備えられる該部材を形成する材料として使用されている材料を使用することができる。例えば、金属材料(アルミニウム、スチール、ステンレス鋼等)、繊維、木、複合材及び樹脂などを挙げることができ、具体的には、炭素繊維等の強化材を含有する複合材、特に、エポキシ樹脂やフェノール樹脂等の重合体を含有する複合材などを挙げることができる。本発明の坑井掘削用プラグは、フラクチャリングを行った後には、その除去や流路の確保を容易にすることにより坑井掘削の経費軽減や工程短縮ができる坑井掘削用プラグであることから、先にマンドレルについて説明したと同様に、外周面上取付部材の少なくとも1つが分解性材料から形成されるものであることが好ましい。 [Material for forming a member to be mounted on the outer peripheral surface orthogonal to the axial direction of the mandrel]
The material forming the outer peripheral surface mounting member provided in the plug for well excavation of the present invention is not particularly limited, and a material conventionally used as a material for forming the member provided in the plug for well excavation is used. Can be used. For example, metal materials (aluminum, steel, stainless steel, etc.), fibers, wood, composite materials and resins can be mentioned. Specifically, composite materials containing reinforcing materials such as carbon fibers, particularly epoxy resins. And composite materials containing polymers such as phenol resins. The plug for well excavation of the present invention is a plug for well excavation that can reduce the cost of well drilling and shorten the process by facilitating the removal and securing the flow path after fracturing. Thus, as described above for the mandrel, it is preferable that at least one of the outer peripheral surface mounting members is formed of a degradable material.
本発明の坑井掘削用プラグにおいて、外周面上取付部材の少なくとも1つを形成する分解性材料としては、先にマンドレルに説明したと同様に、生分解性、加水分解性を有する分解性材料、更に他の何らかの方法によって化学的に分解することができる分解性材料を使用することができる。 (Degradable material)
In the plug for well excavation of the present invention, as the degradable material forming at least one of the mounting members on the outer peripheral surface, the degradable material having biodegradability and hydrolyzability as described in the mandrel above. In addition, degradable materials that can be chemically decomposed by some other method can be used.
本発明の坑井掘削用プラグにおいて、外周面上取付部材の少なくとも1つが分解性材料から形成されるものである場合、分解性材料から形成される外周面上取付部材の曲折部分にかかる大荷重の負荷を軽減して、確実に坑井内における移送、坑井孔の閉塞及びフラクチャリングを行う観点から、外周面上取付部材における曲折部分の曲率半径が0.5~50mmであるものとすることができる。本発明の坑井掘削用プラグは、外周面上取付部材における曲折部分の曲率半径が上記の範囲であることにより、高深度化など採掘条件がますます過酷かつ多様なものとなっているもとで、曲折部分にかかる大荷重の負荷を軽減して、確実に坑井内における移送、坑井孔の閉塞及びフラクチャリングを行うことができ、かつ、その除去や流路の確保を容易にすることにより坑井掘削の経費軽減や工程短縮ができる坑井掘削用プラグである。すなわち、分解性材料から形成される外周面上取付部材における曲折部分の曲率半径が小さすぎると、該曲折部分が、坑井内における移送、坑井孔の閉塞及びフラクチャリングに負荷される高圧力により破損するおそれがある。分解性材料から形成される外周面上取付部材における曲折部分の曲率半径が大きすぎると、移行部(曲折部分を形成するために外周面上取付部材の外径が漸次変化する箇所)が長くなりすぎて所望の形状及び位置の曲折部分を形成できない場合がある。 [Curve radius of bent part]
In the well excavation plug of the present invention, when at least one of the outer peripheral surface mounting members is formed from a degradable material, a large load is applied to the bent portion of the outer peripheral surface mounting member formed from the degradable material. The radius of curvature of the bent portion of the mounting member on the outer peripheral surface shall be 0.5 to 50 mm from the viewpoint of reducing the load on the well and reliably carrying out the transfer in the well, blocking the well hole, and fracturing. Can do. The plug for well excavation of the present invention is such that the curvature radius of the bent portion of the mounting member on the outer peripheral surface is in the above range, so that the mining conditions such as deepening are becoming more severe and diverse. Therefore, it is possible to reduce the load of a large load applied to the bent portion, reliably transfer in the well, close the well hole and fracture, and facilitate the removal and securing of the flow path. This is a well drilling plug that can reduce the cost of well drilling and shorten the process. That is, if the radius of curvature of the bent portion of the mounting member on the outer peripheral surface formed from a degradable material is too small, the bent portion is caused by high pressure applied to transfer in the well, blocking of the well hole, and fracturing. There is a risk of damage. If the radius of curvature of the bent portion of the mounting member on the outer peripheral surface formed from a degradable material is too large, the transition portion (where the outer diameter of the mounting member on the outer peripheral surface gradually changes to form the bent portion) becomes longer. In some cases, a bent portion having a desired shape and position cannot be formed.
本発明のマンドレルと、外周面上取付部材とを備える坑井掘削用プラグは、マンドレルまたは外周面上取付部材の少なくとも1つが、分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmであることを特徴とする。分解性材料について、以下詳述する。 3. Decomposable material The plug for well excavation provided with the mandrel of the present invention and the outer peripheral surface mounting member has at least one of the mandrel or the outer peripheral surface mounting member formed of a degradable material, and the curvature of the bent portion. The radius is 0.5 to 50 mm. The decomposable material will be described in detail below.
本発明のマンドレルまたは外周面上取付部材の少なくとも1つを形成する分解性材料としては、高深度地下の高温高圧の環境において所期の強度を有すると同時に、分解性に優れることが求められことから、分解性樹脂が好ましい。分解性樹脂とは、先に説明したように生分解性、加水分解性、更にその他の方法によって化学的に分解することができる樹脂を意味する。分解性樹脂としては、例えば、ポリ乳酸、ポリグリコール酸、ポリ-ε-カプロラクトン等の脂肪族ポリエステルやポリビニルアルコール(ケン化度80~95モル%程度の部分ケン化ポリビニルアルコールなど)などが挙げられるが、より好ましくは脂肪族ポリエステルである。すなわち、分解性材料は、脂肪族ポリエステルであることが好ましい。分解性樹脂は、単独でまたは2種以上をブレンド等により組み合わせて使用することもできる。また、分解性材料から形成される外周面上取付部材が、拡径可能な環状のゴム部材である場合は、分解性材料として、例えば、脂肪族ポリエステル系ゴム、ポリウレタンゴム、天然ゴム、ポリイソプレン、アクリルゴム、脂肪族ポリエステルゴム、ポリエステル系熱可塑性エラストマー、ポリアミド系熱可塑性エラストマー等の分解性ゴムを使用することができる。 (Degradable resin)
The decomposable material forming at least one of the mandrel or the outer peripheral surface mounting member of the present invention is required to have a desired strength in a high-temperature and high-pressure environment in a deep underground and at the same time be excellent in decomposability. Therefore, a degradable resin is preferable. The degradable resin means a resin that can be chemically decomposed by biodegradability, hydrolyzability, and other methods as described above. Examples of the degradable resin include aliphatic polyesters such as polylactic acid, polyglycolic acid, poly-ε-caprolactone, and polyvinyl alcohol (such as partially saponified polyvinyl alcohol having a saponification degree of about 80 to 95 mol%). Is more preferably an aliphatic polyester. That is, the degradable material is preferably an aliphatic polyester. Decomposable resins can be used alone or in combination of two or more by blending or the like. In addition, when the mounting member on the outer peripheral surface formed of a decomposable material is an annular rubber member capable of expanding the diameter, examples of the decomposable material include aliphatic polyester rubber, polyurethane rubber, natural rubber, polyisoprene. Decomposable rubbers such as acrylic rubber, aliphatic polyester rubber, polyester-based thermoplastic elastomer, and polyamide-based thermoplastic elastomer can be used.
脂肪族ポリエステルは、例えば、オキシカルボン酸及び/またはラクトンの単独重合または共重合、脂肪族ジカルボン酸と脂肪族ジオールとのエステル化反応、脂肪族ジカルボン酸と、脂肪族ジオールと、オキシカルボン酸及び/またはラクトンとの共重合により得られる脂肪族ポリエステルであり、温度20~100℃程度の水に速やかに溶解するものが好ましい。 [Aliphatic polyester]
The aliphatic polyester includes, for example, homopolymerization or copolymerization of oxycarboxylic acid and / or lactone, esterification reaction of aliphatic dicarboxylic acid and aliphatic diol, aliphatic dicarboxylic acid, aliphatic diol, oxycarboxylic acid and An aliphatic polyester obtained by copolymerization with lactone and / or one that dissolves rapidly in water at a temperature of about 20 to 100 ° C. is preferable.
脂肪族ポリエステル、好ましくはPGA、PLAまたはPGLAとしては、溶融粘度が通常50~5000Pa・s、好ましくは150~3000Pa・s、より好ましくは300~1500Pa・sであるものを使用することができる。溶融粘度は、温度240℃、せん断速度122sec-1において測定するものである。溶融粘度が小さすぎると、坑井掘削用プラグに備えられるマンドレルに求められる強度が不足する場合がある。溶融粘度が大きすぎると、例えば、マンドレルを製造するために高い溶融温度が必要となり、脂肪族ポリエステルが熱劣化するおそれがあったり、分解性が不十分となったりすることがある。前記の溶融粘度は、キャピラリー(直径1mmφ×長さ10mm)を装着したキャピログラフ(株式会社東洋精機製作所製の「キャピログラフ1-C」)を使用して、試料約20gを所定温度(240℃)にて5分間保持した後、せん断速度122sec-1の条件で測定を行うものである。 (Melt viscosity)
As the aliphatic polyester, preferably PGA, PLA or PGLA, those having a melt viscosity of usually 50 to 5000 Pa · s, preferably 150 to 3000 Pa · s, more preferably 300 to 1500 Pa · s can be used. The melt viscosity is measured at a temperature of 240 ° C. and a shear rate of 122 sec-1. If the melt viscosity is too small, the strength required for the mandrel provided in the well drilling plug may be insufficient. If the melt viscosity is too large, for example, a high melting temperature is required to produce a mandrel, and the aliphatic polyester may be thermally deteriorated or the decomposability may be insufficient. The melt viscosity is about 20 g of sample at a predetermined temperature (240 ° C.) using a capillograph (“Capillograph 1-C” manufactured by Toyo Seiki Seisakusyo Co., Ltd.) equipped with a capillary (
<GPC測定条件>
装置:株式会社島津製作所製のShimazu LC-9A
カラム:昭和電工株式会社製のHFIP-806M 2本(直列接続)+プレカラム:HFIP-LG 1本
カラム温度:40℃
溶離液:トリフルオロ酢酸ナトリウムを5mMの濃度で溶解させたHFIP溶液
流速:1mL/分
検出器:示差屈折率計
分子量校正:分子量の異なる標準分子量のポリメタクリル酸メチル5種(POLYMER LABORATORIES Ltd.製)を用いて作成した分子量の検量線データを使用。 PGA, which is a particularly preferred aliphatic polyester, has a weight average molecular weight of 180,000 to 300,000, a temperature of 270 ° C., a shear rate, for example, from the viewpoint of moldability such that cracking is less likely to occur during molding by solidification extrusion molding. PGA having a melt viscosity of 700 to 2000 Pa · s measured at 122 sec −1 is more preferable. Among them, PGA having a weight average molecular weight of 190,000 to 240000, a temperature of 270 ° C., and a melt viscosity measured at a shear rate of 122 sec −1 is 800 to 1200 Pa · s. The melt viscosity is measured according to the method described above (the measurement temperature is 270 ° C.). The weight average molecular weight is obtained by dissolving 10 mg of PGA sample in hexafluoroisopropanol (HFIP) in which sodium trifluoroacetate is dissolved at a concentration of 5 mM to 10 mL, and then filtering with a membrane filter. 10 μl of the sample solution was measured by gel permeation chromatography (GPC) under the following conditions.
<GPC measurement conditions>
Apparatus: Shimazu LC-9A manufactured by Shimadzu Corporation
Column: Showa Denko HFIP-806M 2 (in series connection) + Precolumn: HFIP-
Eluent: HFIP solution in which sodium trifluoroacetate is dissolved at a concentration of 5 mM Flow rate: 1 mL / min Detector: Differential refractometer Molecular weight calibration: Polymethyl methacrylate of 5 standard molecular weights with different molecular weights (manufactured by POLYMER LABORATORIES Ltd.) ) Is used for the molecular weight calibration curve data.
分解性材料、好ましくは分解性樹脂、より好ましくは脂肪族ポリエステル、更に好ましくはPGAには、本発明の目的を阻害しない範囲で、更に他の配合成分として、樹脂材料(分解性材料が分解性樹脂である場合は、他の樹脂)や、安定剤、分解促進剤または分解抑制剤、強化材等の各種添加剤を含有させ、または配合してもよい。分解性材料が、強化材を含有することが好ましく、この場合、分解性材料は、複合材ということができる。分解性材料が、分解性樹脂である場合は、いわゆる強化樹脂である。強化樹脂から形成されるマンドレルまたは外周面上取付部材は、好ましくは、強化材を含有する脂肪族ポリエステルから形成されるものである。 [Other ingredients]
A degradable material, preferably a degradable resin, more preferably an aliphatic polyester, and even more preferably PGA, is a resin material (degradable material is degradable), as long as it does not impair the object of the present invention. In the case of a resin, other additives such as other resins), a stabilizer, a decomposition accelerator or a decomposition inhibitor, and a reinforcing material may be contained or blended. The degradable material preferably contains a reinforcing material. In this case, the degradable material can be referred to as a composite material. When the degradable material is a degradable resin, it is a so-called reinforced resin. The mandrel or outer peripheral surface mounting member formed from a reinforced resin is preferably formed from an aliphatic polyester containing a reinforcing material.
強化材としては、従来、機械的強度や耐熱性の向上を目的として樹脂材料等の強化材として使用されている材料を使用することができ、繊維状強化材や、粒状または粉末状強化材を使用することができる。強化材は、分解性樹脂等の分解性材料100質量部に対して、通常150質量部以下、好ましくは10~100質量部の範囲で含有させることができる。 (Reinforcement material)
As the reinforcing material, it is possible to use a material that has been conventionally used as a reinforcing material such as a resin material for the purpose of improving mechanical strength and heat resistance, such as a fibrous reinforcing material or a granular or powdered reinforcing material. Can be used. The reinforcing material can be contained in an amount of usually 150 parts by mass or less, preferably 10 to 100 parts by mass with respect to 100 parts by mass of a degradable material such as a degradable resin.
分解性材料から形成されるマンドレルまたは外周面上取付部材としては、分解性材料と金属または無機物との複合材により形成されるものとすることができる。具体的には、PGAを始めとする分解性樹脂等の分解性材料からなる母材に、所定形状の窪み等の凹部を設け、該凹部の形状に合致する形状の金属(金属片等)または無機物をはめ込んで、これらを接着剤で固定したり、金属片や無機物と母材が固定状態を維持できるように針金、繊維等を巻きつけて固定したりしてなるものが挙げられる。 [Composite material]
The mandrel or outer peripheral surface mounting member formed from a degradable material may be formed of a composite material of a degradable material and a metal or an inorganic material. Specifically, a base material made of a degradable material such as a degradable resin such as PGA is provided with a recess such as a recess having a predetermined shape, and a metal (metal piece or the like) having a shape matching the shape of the recess or Examples include those in which an inorganic substance is inserted and fixed with an adhesive, or a metal piece or an inorganic substance and a base material are wound and fixed so as to maintain a fixed state.
本発明のマンドレルと、外周面上取付部材とを備える坑井掘削用プラグは、マンドレルまたは外周面上取付部材の少なくとも1つが、分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmであることを特徴とする。すなわち、分解性材料から形成されるマンドレルまたは外周面上取付部材における曲折部分の曲率半径が0.5~50mmである。以下、分解性材料から形成されるマンドレルまたは外周面上取付部材の少なくとも1つの曲折部分の曲率半径について詳述する。 4). The radius of curvature of the bent portion In the well drilling plug including the mandrel of the present invention and the outer peripheral surface mounting member, at least one of the mandrel or the outer peripheral surface mounting member is formed of a degradable material, and the bent portion thereof The curvature radius is 0.5 to 50 mm. That is, the radius of curvature of the bent portion of the mandrel formed from the degradable material or the mounting member on the outer peripheral surface is 0.5 to 50 mm. Hereinafter, the radius of curvature of at least one bent portion of the mandrel or the outer peripheral surface mounting member formed from the degradable material will be described in detail.
本発明の坑井掘削用プラグは、マンドレルと、外周面上取付部材とを備える坑井掘削用プラグであって、マンドレルまたは該部材の少なくとも1つが、分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmであることを特徴とする坑井掘削用プラグである。本発明の坑井掘削用プラグは、更に、通常坑井掘削用プラグに備えられることがあるその他の部材を備えることができる。例えば、マンドレルが、軸方向に沿う中空部を有する場合、中空部に置かれ、流体の流れを制御するボール(金属、樹脂等の材料から形成され、分解性材料から形成されてもよい。)を備えることができる。また、坑井掘削用プラグのマンドレル、外周面上取付部材、更には前記のその他の部材を、それぞれまたは他の部材に結合したり開放したりするための部材、例えば、回転止め部材などを備えることができる。本発明のマンドレルと、外周面上取付部材とを備える坑井掘削用プラグは、そのすべてを分解性材料から形成されるものとすることもできる。 5. Plug for well excavation The plug for well excavation of the present invention is a plug for well excavation provided with a mandrel and a mounting member on the outer peripheral surface, and at least one of the mandrel or the member is formed of a degradable material. The well excavation plug is characterized in that the radius of curvature of the bent portion is 0.5 to 50 mm. The well drilling plug of the present invention may further include other members that may be normally provided in a well drilling plug. For example, when the mandrel has a hollow portion along the axial direction, the ball is placed in the hollow portion and controls the flow of fluid (formed from a material such as metal or resin, and may be formed from a degradable material). Can be provided. Further, a well drilling plug mandrel, an outer peripheral mounting member, and a member for coupling or releasing the other member to or from each other member, for example, a rotation stop member, etc. be able to. The plug for well excavation provided with the mandrel of the present invention and the mounting member on the outer peripheral surface may be all made of a degradable material.
本発明の坑井掘削用プラグは、先に説明したように、例えば、1対のリング状固定部材にマンドレルの軸方向の力を加えることにより、拡径可能な環状のゴム部材にマンドレルの軸方向の力を伝達し、その結果、拡径可能な環状のゴム部材がマンドレルの軸方向に圧縮されて、軸方向の距離が縮小(縮径)することに伴い、拡径可能な環状のゴム部材が、マンドレルの軸方向と直交する方向に拡径する。該環状のゴム部材は、拡径して、軸方向に直交する方向の外方部が坑井孔の内壁と当接するとともに、軸方向に直交する方向の内方部がマンドレルの外周面に当接することにより、プラグと坑井孔との間の空間を閉塞(シール)することができる(坑井孔の閉塞)。また、スリップがウエッジの斜面の上面に乗り上げてマンドレルの軸方向と直交する外方に移動し、該スリップのマンドレルの軸方向と直交する最外方の周面が、坑井孔の内壁と当接して、プラグを坑井孔の所定位置に固定することができる。次いで、プラグと坑井孔との間の空間を閉塞(シール)した状態で、フラクチャリングを行うことができる。 [Clogging of borehole]
As described above, the plug for well excavation of the present invention, for example, applies a mandrel axial force to a pair of ring-shaped fixing members in the axial direction of the mandrel. Directional force is transmitted, and as a result, the diameter-expandable annular rubber member is compressed in the axial direction of the mandrel, and the axial distance is reduced (reduced diameter). The member expands in the direction perpendicular to the axial direction of the mandrel. The annular rubber member expands in diameter so that the outer portion in the direction orthogonal to the axial direction contacts the inner wall of the well hole and the inner portion in the direction orthogonal to the axial direction contacts the outer peripheral surface of the mandrel. By contacting, the space between the plug and the well hole can be closed (seal) (blocking of the well hole). In addition, the slip rides on the upper surface of the slope of the wedge and moves outwardly perpendicular to the axial direction of the mandrel, and the outermost peripheral surface perpendicular to the axial direction of the mandrel of the slip contacts the inner wall of the wellbore. In contact, the plug can be fixed in place in the wellbore. Next, fracturing can be performed in a state where the space between the plug and the well hole is closed (sealed).
本発明の坑井掘削用プラグは、所定の諸区画のフラクチャリングが終了した後、通常は、坑井の掘削が終了して坑井が完成し、石油や天然ガス等の生産を開始するときに、生分解、加水分解または更に他の何らかの方法による化学的な分解により、分解性材料から形成されるマンドレルまたは外周面上取付部材の少なくとも1つを、所望によっては更に分解性材料から形成されるマンドレルを、容易に分解して除去することができるとともに、炭化水素資源の採掘を効率的に行うことができる。したがって、本発明の坑井掘削用プラグによれば、従来、坑井完成後に、坑井内に残置されていた多数の坑井掘削用プラグを除去、回収したり、破砕、穿孔その他の方法によって、破壊したり、小片化したりするために要していた多くの経費と時間が不要となるので、坑井掘削の経費軽減や工程短縮ができる。 [Disassembly of plug for well drilling]
The well drilling plug according to the present invention is usually used after completion of fracturing of predetermined sections, when drilling of the well is completed and the well is completed, and production of oil, natural gas, etc. is started. In addition, at least one of a mandrel or an outer peripheral mounting member formed from a degradable material by biodegradation, hydrolysis, or chemical decomposition by some other method is optionally formed from the degradable material. The mandrel can be easily decomposed and removed, and hydrocarbon resources can be mined efficiently. Therefore, according to the well drilling plug of the present invention, conventionally, after completion of the well, a large number of well drilling plugs left in the well are removed, recovered, crushed, drilled or other methods, Many expenses and time required for destruction or fragmentation are not required, so that the cost of well drilling can be reduced and the process can be shortened.
本発明の坑井掘削用プラグは、マンドレルと、外周面上取付部材とを備える坑井掘削用プラグであって、マンドレルまたは該部材の少なくとも1つが、分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmであることを特徴とする坑井掘削用プラグを製造することができる限り、その製造方法は限定されない。例えば、射出成形、押出成形(固化押出成形を含む。)、遠心成形、圧縮成形その他の公知の成形方法により、坑井掘削用プラグに備えられる各部材を成形し、得られた各部材を、必要に応じて切削加工や穿孔等の機械加工した後に、それ自体公知の方法によって組み合わせて、坑井掘削用プラグを得ることができる。 II. Manufacturing method of well drilling plug The well drilling plug of the present invention is a well drilling plug including a mandrel and an outer peripheral surface mounting member, and at least one of the mandrel or the member is a degradable material. The manufacturing method is not limited as long as the plug for well excavation, which is formed from the above and has a curvature radius of 0.5 to 50 mm, can be manufactured. For example, each member provided in the plug for well excavation is molded by injection molding, extrusion molding (including solid extrusion molding), centrifugal molding, compression molding, or other known molding methods, and each member obtained is After machining such as cutting or drilling as necessary, a well drilling plug can be obtained by a combination of methods known per se.
本発明のマンドレルと、外周面上取付部材とを備える坑井掘削用プラグを使用して、坑井孔の目止め処理を行った後に、坑井掘削用プラグの一部または全部が分解される坑井掘削方法によれば、所定の諸区画のフラクチャリングが終了し、または、坑井の掘削が終了して坑井が完成し、石油や天然ガス等の生産を開始するときには、生分解、加水分解または更に他の何らかの方法による化学的な分解により、外周面上取付部材の少なくとも1つ、所望によっては更に分解性材料から形成されるマンドレルを、容易に分解して除去することができるとともに、炭化水素資源の採掘を効率的に行うことができる。この結果、本発明の坑井掘削方法によれば、従来、坑井完成後に、坑井内に残置されていた多数の坑井掘削用プラグを除去、回収したり、破砕、穿孔その他の方法によって、破壊したり、小片化したりするために要していた多くの経費と時間が不要となるので、坑井掘削の経費軽減や工程短縮ができる。 III. Well Drilling Method Using a well drilling plug provided with the mandrel of the present invention and a mounting member on the outer peripheral surface, after performing a sealing process for a well hole, a part or all of the well drilling plug According to the well excavation method in which the fracturing is completed, when the fracturing of the predetermined sections is completed, or when the well is completed and the well is completed and production of oil, natural gas, etc. is started At least one of the mounting members on the outer peripheral surface, and optionally a mandrel formed from a further degradable material, is easily decomposed and removed by chemical decomposition by biodegradation, hydrolysis or some other method. In addition, it is possible to efficiently extract hydrocarbon resources. As a result, according to the well drilling method of the present invention, conventionally, after completion of the well, a number of well drilling plugs left in the well are removed, recovered, crushed, drilled and other methods, Many expenses and time required for destruction or fragmentation are not required, so that the cost of well drilling can be reduced and the process can be shortened.
2a、2b: スリップ
3a、3b: ウエッジ
4a、4b: リング状固定部材
5 : 拡径可能な環状のゴム部材
H : 坑井孔の内壁
A : フランジ部の厚み
R : 曲率半径
T : テーパー部の高さ 1:
Claims (20)
- マンドレルと、マンドレルの軸方向に直交する外周面上に取り付けられる部材とを備える坑井掘削用プラグであって、マンドレルまたは該部材の少なくとも1つが、
分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmである
ことを特徴とする坑井掘削用プラグ。 A well drilling plug comprising a mandrel and a member attached on an outer peripheral surface perpendicular to the axial direction of the mandrel, wherein the mandrel or at least one of the members is
A well drilling plug characterized by being formed of a degradable material and having a curvature radius of 0.5 to 50 mm at a bent portion thereof. - マンドレルの軸方向に直交する外周面上に取り付けられる部材が、スリップ、ウエッジ、1対のリング状固定部材、及び、拡径可能な環状のゴム部材からなる群より選ばれる少なくとも1つである請求項1記載の坑井掘削用プラグ。 The member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel is at least one selected from the group consisting of a slip, a wedge, a pair of ring-shaped fixing members, and an annular rubber member capable of expanding the diameter. Item 1. A well drilling plug according to Item 1.
- 1対のリング状固定部材が、マンドレルの軸方向に直交する外周面上に取り付けられる拡径可能な環状のゴム部材を圧縮状態のまま固定することができるものである請求項2記載の坑井掘削用プラグ。 The well according to claim 2, wherein the pair of ring-shaped fixing members are capable of fixing an expandable annular rubber member attached on an outer peripheral surface orthogonal to the axial direction of the mandrel in a compressed state. Plug for excavation.
- 少なくとも1つのスリップとウエッジとの組み合わせが、1対のリング状固定部材の間に置かれる請求項2または3記載の坑井掘削用プラグ。 The well excavation plug according to claim 2 or 3, wherein a combination of at least one slip and a wedge is placed between a pair of ring-shaped fixing members.
- 分解性材料から形成されるマンドレルの軸方向に直交する外周面上に取り付けられる部材が、分解性材料と金属または無機物との複合材により形成される請求項1乃至4のいずれか1項に記載の坑井掘削用プラグ。 The member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel formed from a degradable material is formed of a composite material of a degradable material and a metal or an inorganic material. Plug for well drilling.
- マンドレルが、分解性材料から形成され、かつ、その曲折部分の曲率半径が0.5~50mmである請求項1乃至5のいずれか1項に記載の坑井掘削用プラグ。 The well drilling plug according to any one of claims 1 to 5, wherein the mandrel is formed of a degradable material, and a curvature radius of the bent portion is 0.5 to 50 mm.
- 分解性材料から形成されるマンドレルが、軸方向に沿う中空部を有する請求項6記載の坑井掘削用プラグ。 The plug for well excavation according to claim 6, wherein the mandrel formed of a degradable material has a hollow portion along the axial direction.
- 分解性材料から形成されるマンドレルと、分解性材料から形成されるマンドレルの軸方向に直交する外周面上に取り付けられる部材とが一体に形成されている請求項6または7記載の坑井掘削用プラグ。 The well mandrel formed from a degradable material and the member attached on the outer peripheral surface orthogonal to the axial direction of the mandrel formed from a degradable material are integrally formed. plug.
- 一体成形により一体に形成されている請求項8記載の坑井掘削用プラグ。 The plug for well excavation according to claim 8, which is integrally formed by integral molding.
- 機械加工により一体に形成されている請求項8記載の坑井掘削用プラグ。 The well excavation plug according to claim 8, which is integrally formed by machining.
- 曲折部分が、凸部、段部、フランジ部、溝部、ねじ山及びねじ底からなる群より選ばれる少なくとも1つである請求項1乃至10のいずれか1項に記載の坑井掘削用プラグ。 The well excavation plug according to any one of claims 1 to 10, wherein the bent portion is at least one selected from the group consisting of a convex portion, a step portion, a flange portion, a groove portion, a screw thread, and a screw bottom.
- 曲折部分が、更にテーパー部を有し、テーパー部の高さが1mm以上である請求項11記載の坑井掘削用プラグ。 The plug for well excavation according to claim 11, wherein the bent portion further has a tapered portion, and the height of the tapered portion is 1 mm or more.
- 分解性材料が、脂肪族ポリエステルである請求項1乃至12のいずれか1項に記載の坑井掘削用プラグ。 The plug for well excavation according to any one of claims 1 to 12, wherein the degradable material is aliphatic polyester.
- 脂肪族ポリエステルが、ポリグリコール酸である請求項13記載の坑井掘削用プラグ。 The plug for well excavation according to claim 13, wherein the aliphatic polyester is polyglycolic acid.
- ポリグリコール酸が、重量平均分子量が180000~300000、かつ、温度270℃、せん断速度122sec-1で測定した溶融粘度が700~2000Pa・sである請求項14記載の坑井掘削用プラグ。 The well drilling plug according to claim 14, wherein the polyglycolic acid has a weight average molecular weight of 180,000 to 300,000, a melt viscosity of 700 to 2000 Pa · s measured at a temperature of 270 ° C and a shear rate of 122 sec -1 .
- 分解性材料が、強化材を含有する請求項1乃至15のいずれか1項に記載の坑井掘削用プラグ。 The plug for well excavation according to any one of claims 1 to 15, wherein the degradable material contains a reinforcing material.
- マンドレルが、ポリグリコール酸から形成される請求項1乃至16のいずれか1項に記載の坑井掘削用プラグ。 The plug for well excavation according to any one of claims 1 to 16, wherein the mandrel is formed of polyglycolic acid.
- 分解性材料から形成されるマンドレルが、外周面にラチェット機構のかみ合い部を備え、該かみ合い部の曲率半径が0.5~50mmである請求項1乃至17のいずれか1項に記載の坑井掘削用プラグ。 The well according to any one of claims 1 to 17, wherein the mandrel formed of a degradable material includes an engagement portion of a ratchet mechanism on an outer peripheral surface, and a curvature radius of the engagement portion is 0.5 to 50 mm. Plug for excavation.
- 分解性材料から形成されるマンドレルが、外周面に雄ねじ構造を備え、1対のリング状固定部材の一方は、該雄ねじ構造と対向する雌ねじ構造をその内周面に備え、かつ、前記1対のリング状固定部材の一方が、前記マンドレルの軸方向に摺動することができない状態に固定されている請求項1乃至18のいずれか1項に記載の坑井掘削用プラグ。 A mandrel formed of a degradable material has a male screw structure on the outer peripheral surface, and one of the pair of ring-shaped fixing members has a female screw structure facing the male screw structure on its inner peripheral surface, 19. The plug for well excavation according to claim 1, wherein one of the ring-shaped fixing members is fixed in a state in which the ring-shaped fixing member cannot slide in the axial direction of the mandrel.
- 請求項1乃至19のいずれか1項に記載の坑井掘削用プラグを使用して、坑井孔の目止め処理を行った後に、坑井掘削用プラグの一部または全部が分解されることを特徴とする坑井掘削方法。 A part or all of the plug for well excavation is disassembled after performing the sealing treatment for the well hole using the plug for well excavation according to any one of claims 1 to 19. Well drilling method characterized by the above.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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CA2927080A CA2927080C (en) | 2013-10-23 | 2014-10-20 | Plug for well drilling |
JP2015543843A JP5955469B2 (en) | 2013-10-23 | 2014-10-20 | Plug for well drilling |
US15/028,227 US20160237774A1 (en) | 2013-10-23 | 2014-10-20 | Plug for well drilling |
Applications Claiming Priority (2)
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JP2013220223 | 2013-10-23 | ||
JP2013-220223 | 2013-10-23 |
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WO2015060246A1 true WO2015060246A1 (en) | 2015-04-30 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2014/077831 WO2015060246A1 (en) | 2013-10-23 | 2014-10-20 | Plug for well drilling |
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US (1) | US20160237774A1 (en) |
JP (1) | JP5955469B2 (en) |
CA (1) | CA2927080C (en) |
WO (1) | WO2015060246A1 (en) |
Cited By (3)
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USRE46028E1 (en) | 2003-05-15 | 2016-06-14 | Kureha Corporation | Method and apparatus for delayed flow or pressure change in wells |
WO2017111159A1 (en) * | 2015-12-25 | 2017-06-29 | 株式会社クレハ | Shaped material for downhole tool member, downhole tool member, and downhole tool |
US9708878B2 (en) | 2003-05-15 | 2017-07-18 | Kureha Corporation | Applications of degradable polymer for delayed mechanical changes in wells |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11787991B1 (en) | 2022-04-11 | 2023-10-17 | Baker Hughes Oilfield Operations Llc | Disintegrable rubber seal, method of manufacture, and application thereof |
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JPS641892A (en) * | 1987-04-13 | 1989-01-06 | Drilex Syst Inc | Packing aggregate |
US20050205266A1 (en) * | 2004-03-18 | 2005-09-22 | Todd Bradley I | Biodegradable downhole tools |
US20110277989A1 (en) * | 2009-04-21 | 2011-11-17 | Frazier W Lynn | Configurable bridge plugs and methods for using same |
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US9500061B2 (en) * | 2008-12-23 | 2016-11-22 | Frazier Technologies, L.L.C. | Downhole tools having non-toxic degradable elements and methods of using the same |
-
2014
- 2014-10-20 WO PCT/JP2014/077831 patent/WO2015060246A1/en active Application Filing
- 2014-10-20 JP JP2015543843A patent/JP5955469B2/en not_active Expired - Fee Related
- 2014-10-20 CA CA2927080A patent/CA2927080C/en active Active
- 2014-10-20 US US15/028,227 patent/US20160237774A1/en not_active Abandoned
Patent Citations (3)
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JPS641892A (en) * | 1987-04-13 | 1989-01-06 | Drilex Syst Inc | Packing aggregate |
US20050205266A1 (en) * | 2004-03-18 | 2005-09-22 | Todd Bradley I | Biodegradable downhole tools |
US20110277989A1 (en) * | 2009-04-21 | 2011-11-17 | Frazier W Lynn | Configurable bridge plugs and methods for using same |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE46028E1 (en) | 2003-05-15 | 2016-06-14 | Kureha Corporation | Method and apparatus for delayed flow or pressure change in wells |
US9708878B2 (en) | 2003-05-15 | 2017-07-18 | Kureha Corporation | Applications of degradable polymer for delayed mechanical changes in wells |
US10280703B2 (en) | 2003-05-15 | 2019-05-07 | Kureha Corporation | Applications of degradable polymer for delayed mechanical changes in wells |
WO2017111159A1 (en) * | 2015-12-25 | 2017-06-29 | 株式会社クレハ | Shaped material for downhole tool member, downhole tool member, and downhole tool |
CN108368572A (en) * | 2015-12-25 | 2018-08-03 | 株式会社吴羽 | Downhole tool component raw material proximate matter, downhole tool component and downhole tool |
RU2697466C1 (en) * | 2015-12-25 | 2019-08-14 | Куреха Корпорейшн | Shaped material for well tool component, well tool component and well tool |
US10738561B2 (en) | 2015-12-25 | 2020-08-11 | Kureha Corporation | Stock shape for downhole tool component, downhole tool component, and downhole tool |
Also Published As
Publication number | Publication date |
---|---|
US20160237774A1 (en) | 2016-08-18 |
JPWO2015060246A1 (en) | 2017-03-09 |
CA2927080A1 (en) | 2015-04-30 |
JP5955469B2 (en) | 2016-07-20 |
CA2927080C (en) | 2018-07-10 |
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