CN113073958A - Recyclable bridge plug and using method - Google Patents
Recyclable bridge plug and using method Download PDFInfo
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- CN113073958A CN113073958A CN202110294530.1A CN202110294530A CN113073958A CN 113073958 A CN113073958 A CN 113073958A CN 202110294530 A CN202110294530 A CN 202110294530A CN 113073958 A CN113073958 A CN 113073958A
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- 238000000034 method Methods 0.000 title claims abstract description 25
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- 229920001971 elastomer Polymers 0.000 claims description 53
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 19
- 238000012856 packing Methods 0.000 claims description 15
- 229910000576 Laminated steel Inorganic materials 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 9
- 230000003111 delayed effect Effects 0.000 claims description 8
- 229920006168 hydrated nitrile rubber Polymers 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 229910000816 inconels 718 Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 description 13
- 238000005553 drilling Methods 0.000 description 12
- 238000010276 construction Methods 0.000 description 7
- 238000003801 milling Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- UQMRAFJOBWOFNS-UHFFFAOYSA-N butyl 2-(2,4-dichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC=C(Cl)C=C1Cl UQMRAFJOBWOFNS-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 238000003825 pressing Methods 0.000 description 2
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- 230000035882 stress Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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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
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
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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
- E21B33/126—Packers; Plugs with fluid-pressure-operated elastic cup or skirt
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention belongs to the field of downhole operation tools of oil and gas fields, and particularly relates to a recyclable bridge plug and a using method thereof. The balance valve comprises an upper connector and a bridge plug body which are sequentially connected, wherein the upper connector comprises a balance core shaft, a balance sleeve and an upper core shaft, the balance sleeve is sleeved outside the balance core shaft and is connected by a shearing screw II, the balance core shaft is internally communicated and is sequentially provided with an upper valve sleeve, an upper valve sleeve spring and a lower valve shaft adapter; the bridge plug body comprises a bumper shell, a chuck joint, a lifting valve shell and a connector, and a lower valve shaft, a lower valve and a mandrel are arranged in the bridge plug body; the lift valve is characterized in that a lift valve, a lift spring and a delay inflation ring are arranged in the lift valve shell, and the delay inflation ring is connected with the connector through a shear screw I. The temporary bridge plug is provided under the condition that the production oil pipe is not required to be lifted up, and is simple to operate, safe and reliable.
Description
Technical Field
The invention relates to the technical field of downhole operation tools of oil and gas fields, in particular to a recyclable bridge plug and a using method thereof.
Background
Chinese patent publication No. CN103046896A, published as 2013, 4 and 17, discloses a fracturing bridge plug for staged fracturing modification of casing horizontal wells, having rapid drilling and removing performance, and applied to seiwatt petroleum drilling and production equipment limited company. The device comprises a fracturing ball, a central pipe, a shearing pin, a slip ring, a cone, an end rubber cylinder, a middle rubber cylinder, a guide shoe and the like. The horizontal well staged fracturing bridge plug is simple in structure, greatly saves the milling time of each bridge plug in horizontal well staged fracturing, and meets the low-cost requirement and the environment-friendly requirement of the exploration and development of low-permeability unconventional oil gas in China. The prior art represented by the above patent documents is suitable for the underground condition that the well section condition is not complicated and the internal drift diameter of the well section is consistent.
However, in the oil and gas exploration and development process, the complex situation that the lower large-drift diameter well section needs to be plugged through the upper small-drift diameter part is often encountered, and the expansion ratio of the bridge plug is generally about 1.2 and at most not more than 1.5, and the overall expansion rate is low in the prior art represented by the patent documents, so when the complex situation that the lower large-drift diameter well section needs to be plugged through the upper small-drift diameter part is encountered, the conventional method needs to perform plugging after killing operation, and the following defects occur in the processing mode: firstly, the stratum pollution is caused, the productivity is reduced, and the low-permeability gas well is easy to be killed; secondly, the operation period is long, and the after-pressing production and flowback cost is high; the problem of changing the oil recovery cross under many circumstances exists, and during the change, the well head belongs to out of control state, and the risk is very big.
If other conventional bridge plugs are adopted for plugging, the bridge plugs need to be drilled out after plugging, and although the bridge plugs can be drilled out after construction, the construction process is complex, the drilling and milling period is long, and the construction period is seriously influenced.
Disclosure of Invention
The invention aims at overcoming the defects and shortcomings of the prior art and providing a recyclable bridge plug, the invention enables an expansion rubber sleeve to expand and retract through sealing and unsealing of a valve and a mandrel, the expansion rate can reach about 3.0, and a temporary bridge plug can be provided under the condition that a special well section with a large drift diameter at the lower part needs to be plugged through a small drift diameter part at the upper part under the complex condition without putting out a production oil pipe; meanwhile, the invention can overcome the problems that the conventional bridge plug needs to be removed by drilling after being plugged, the construction process is complex, and the drilling and milling period is long.
Meanwhile, the invention also provides a using method of the recyclable bridge plug.
The invention is realized by adopting the following technical scheme:
a recoverable bridge plug, includes top connection and the bridge plug body that connects gradually, wherein: the upper connector comprises a balance core shaft, a balance sleeve and an upper core shaft, the balance sleeve is arranged outside the balance core shaft and connected through a shearing screw II, the lower end of the balance core shaft is connected with the upper core shaft, the balance core shaft is internally communicated and sequentially provided with an upper valve sleeve, an upper valve sleeve spring and a lower valve shaft adapter; the bridge plug body comprises a bumper shell, a chuck joint, a lifting valve shell and a connector, wherein a lower valve shaft, a lower valve and a mandrel are arranged in the bridge plug body; the lift valve is characterized in that a lift valve, a lift spring and a delay inflation ring are arranged in the lift valve shell, and the delay inflation ring is connected with the connector through a shear screw I.
Further, the packing element mainly by outer packing element, interior packing element, stromatolite steel band, pressure head and tension hoop constitute, the stromatolite steel band be located between interior packing element and the outer packing element, the stromatolite steel band be by a plurality of steel sheet through piling up the hollow cylinder structure that forms, every steel sheet is involute shape's curved surface structure, the hollow cylinder of pressure head for having outer step, the one end of the inner wall of pressure head is the inclined plane, and the inner wall one end of pressure head is passed through inclined plane and interior packing element contact cooperation, the other end of pressure head with the tip welded fastening of stromatolite steel band, the hollow cylinder of tension hoop for having inner step, the outer wall of packing element, pressure head and stromatolite steel band is established to the tension hoop cover, and the tension hoop passes through the cooperation of inner step and the outer step of pressure head is carried out spacing fixedly.
Furthermore, the outer rubber cylinders are arranged at intervals and are coated on the laminated steel belt in a melting mode.
Further, the laminated steel strip is made of an alloy with the model number of Inconel 718; the material of the rubber cylinder is high-hydrogen HNBR crude rubber.
Furthermore, the lower end of the mandrel is connected with a guide cone, the guide cone is in threaded connection with the mandrel, and the lower end of the guide cone is conical.
Furthermore, a pressure relief hole is formed in the joint at the bottom of the element.
Further, the shearing adapter is provided with a shearing screw III and a shearing ring, and the shearing ring is connected with the mandrel through the shearing screw III.
Further, the delayed inflation ring is positioned in the inner cavity of the poppet valve to keep the poppet valve closed. The lifting spring is positioned outside the lifting valve, and the lower part of the lifting spring is connected with the delay inflation ring.
Further, the upper sleeve spring is located within a cavity formed by the upper sleeve, the lower valve shaft adapter and the balance spindle.
Furthermore, the outer diameters of the bumper shell, the chuck joint, the lifting valve shell and the connector are the same as the outer diameter of the guide cone and are larger than the outer diameter of the balance sleeve.
Furthermore, the bumper shell, the chuck joint, the lifting valve shell and the connector are in threaded connection.
Further, a method for using the recyclable bridge plug, which uses any one of the recyclable bridge plugs as described above, comprises the following steps:
s1: the installation before the recoverable bridge plug enters the well;
the recoverable bridge plug is required to be carefully checked and maintained when entering the well, lubricating grease is required to be smeared on each movable part, flexibility and effectiveness are ensured, meanwhile, whether the shearing screw I and the shearing screw II are intact or not is checked, the damaged shearing screw I and the damaged shearing screw II are required to be replaced in time, and whether the rubber cylinder is in a shrinkage state or not is checked;
s2: the well can be filled with the bridge plug;
after the recoverable bridge plug is qualified by ground inspection, the upper valve sleeve is arranged at the foremost end of the operation pipe column and enters a well, and the drilling speed is strictly controlled to be not more than 0.5m/s in the lowering process;
s3: the bridge plug can be recovered for setting;
after the recyclable bridge plug is put in place, pressing and setting are started, an upper valve of the bridge plug is kept open by a feeding tool, and liquid enters the interior of the bridge plug expansion rubber cylinder from the upper valve; when the preset pressure is reached, the safety screw in the tool is sheared, the piston moves downwards, the chuck pawl which locks the running tool to the bridge plug is released, meanwhile, the lift valve is closed by the upward thrust of the reset spring, the liquid entering the expansion rubber sleeve is locked, the bridge plug is set, the pressure in the oil pipe is reduced, and the pipe column is disconnected;
s4: the bridge plug can be recovered for unsealing;
after the operation is finished, the pipe column is connected with a recovery tool, after the pipe column is lowered to the position of the bridge plug, the pipe column is pressed downwards to apply force to enable the sleeve on the recovery tool to be in contact with the balance sleeve on the bridge plug, when the current pressure reaches a preset value, the shearing pin on the balance sleeve is sheared, the balance sleeve moves downwards to balance the pressure difference between the upper portion and the lower portion of the bridge plug, liquid in the expansion rubber cylinder is released, and the tool is unsealed and recovered.
Compared with the prior art represented by the publication number CN103046896A, the invention has the following beneficial effects:
1. by adopting the specific structural form of the upper joint and the bridge plug body, the sealing and unsealing of the valve and the mandrel are realized, so that the expansion rubber sleeve is expanded and retracted, the expansion rate can reach about 3.0, and the temporary bridge plug can be provided under the condition that a specific well section with a large drift diameter at the lower part needs to be plugged through a small drift diameter part at the upper part under the complex condition without putting out a production oil pipe. The plugging is carried out after the killing operation is not needed, the stratum pollution is not caused, the productivity is greatly improved, the operation period is shortened, and the oil recovery cross joint does not need to be frequently replaced, so that the safe production can be effectively ensured. Meanwhile, compared with the conventional bridge plug plugging, the construction process is simple, and the drilling and milling period is short.
2. It should be particularly noted that, the rubber cylinder mainly comprises an outer rubber cylinder, an inner rubber cylinder, a laminated steel band, a pressure head and a tension hoop, particularly, the laminated steel band is a hollow cylindrical structure formed by stacking a plurality of steel sheets, each steel sheet is of an involute curved surface structure, and is limited and fixed through steps and inclined planes, on one hand, the steel sheets can be completely attached to each other during stacking, no gap is left, the stress state is best, and the pressure resistance is highest; on the other hand, the expansion rate of the rubber sleeve is good, and practical tests prove that the expansion rate can reach 2.5, so that the rubber sleeve is particularly suitable for complex-condition specific well sections needing to penetrate through the upper small-drift-diameter part to plug the lower large-drift-diameter well section. Meanwhile, the material of the laminated steel strip adopted by the invention is an alloy with the model number of Inconel 718; the rubber cylinder is made of high-hydrogen HNBR crude rubber, the elongation change rate of the rubber cylinder is expected to be 400% after aging, the rubber cylinder is particularly suitable for performing high-expansion high-pressure sealing operation in a high-temperature environment, the rubber cylinder is combined with the structural form of a laminated steel belt, and practical tests prove that a bridge plug with the outer diameter of 63.5mm can block a sleeve with the inner diameter of 195mm, so that the technical effect that the expansion rate reaches 3.0 can be realized.
3. The lower end of the mandrel is connected with the guide cone, the lower end of the guide cone is conical, and in the actual use process, the structure ensures that the tool is safely inserted into the tool, so that the tool is prevented from being blocked with a well wall.
4. The pressure relief hole is formed in the joint at the bottom of the element, and in the actual use process, the pressure relief hole can release the pressure difference between the upper part and the lower part of the bridge plug, so that the tool is prevented from being flushed out by the pressure difference at the bottom of the well when being released.
5. The delayed inflation ring is positioned in the inner cavity of the poppet valve to keep the poppet valve closed so as to prevent the expansion rubber cylinder from being subjected to liquid inlet setting too early. When a predetermined pressure is reached, the safety screw in the delayed inflation ring will be sheared, thereby opening the poppet valve and filling the expansion bladder with liquid.
6. The outer diameters of the bumper shell, the chuck joint, the lifting valve shell and the connector are the same as the outer diameter of the guide cone and are larger than the outer diameter of the balance sleeve. The safety of going into of instrument has been guaranteed to such structural style, adopts threaded connection between bumper shell, chuck joint, the lift valve casing, the connector, has improved the stability that the instrument is connected.
7. The use method is particularly suitable for bridge plug plugging under complex conditions that a lower large-drift-diameter well section needs to be plugged through an upper small-drift-diameter part and the like, the use method is simple, the expansion rate can reach about 3.0, and a temporary bridge plug can be provided under the condition that a production oil pipe does not need to be put forward; meanwhile, the method can solve the problems that the conventional bridge plug needs to be removed by drilling after being plugged, the construction process is complex, and the drilling and milling period is long.
Drawings
The invention will be described in further detail with reference to the following description taken in conjunction with the accompanying drawings and detailed description, in which:
FIG. 1 is a schematic view of a retrievable bridge plug;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
fig. 4 is a schematic view of a structure of the rubber cylinder.
Reference numerals: 15. shear screws i, 17, shear screws ii, 20, bumper housing, 24, collet coupler, 25, poppet valve, 29, connector, 30, upper mandrel, 31, lift spring, 32, cartridge, 33, element bottom coupler, 34, relief hole, 36, mandrel, 37, late inflation ring, 40, poppet valve housing, 42, pilot cone, 56, shear screw iii, 57, shear adapter, 58, shear ring, 61, upper valve sleeve, 64, balance mandrel, 65, balance sleeve, 66, upper valve sleeve spring, 67, lower valve shaft adapter, 68, lower valve shaft, 69, lower valve, 70, mandrel sleeve, 71, inner cartridge, 72, outer cartridge, 73, laminated steel strip, 74, ram, 75, outer step and inner step contact, 76, weld, 77, ramp, 78, tension band.
Detailed Description
Example 1
In order to overcome the problems that the conventional bridge plug needs to be removed by drilling after being plugged, the construction process is complex, and the drilling and milling period is long, the invention provides the recyclable bridge plug and the use method as shown in figure 1.
As shown in fig. 1, a retrievable bridge plug, includes an upper joint and a bridge plug body which are connected in sequence, wherein: the upper connector comprises a balance mandrel 64, a balance sleeve 65 and an upper mandrel 30, the balance sleeve 65 is arranged outside the balance mandrel 64 and connected through a shearing screw II 17, the lower end of the balance mandrel 64 is connected with the upper mandrel 30, the balance mandrel 64 is communicated internally, and an upper valve sleeve 61, an upper valve sleeve spring 66 and a lower valve shaft adapter 67 are sequentially arranged in the balance mandrel 64; the bridge plug body comprises a bumper shell 20, a chuck joint 24, a lifting valve shell 40 and a connector 29, wherein a lower valve shaft 68, a lower valve 69 and a mandrel 36 are arranged in the bridge plug body, a mandrel sleeve 70 is arranged on the outer side of the upper part of the mandrel 36, and a rubber cylinder 32, an element bottom joint 33 and a shearing adapter 57 are sequentially arranged on the outer side of the middle lower part; the lift valve shell 40 is internally provided with a lift valve 25, a lift spring 31 and a delay inflation ring 37, and the delay inflation ring 37 is connected with the connector 29 through a shear screw I15.
In actual use, the upper valve 61 of the bridge plug is kept open by the running tool. When open, the upper valve provides a passage for liquid to enter the bridge packing expansion cylinder 32. When the running tool is disconnected from the bridge plug, the upper valve 61 closes and locks to prevent pressure above the bridge plug from entering the bridge plug expansion rubber cartridge. The lower valve 33 seals the mandrel of the bridge plug so that the expanding cartridge 32 is inflated with the feed liquid. The lower valve 33 is closed during setting and is opened when the tool is unset for draining the liquid inside the expanding glue cartridge 32 during unset recovery. The poppet valve 25 provides a mechanism to lock the liquid within the expansion bladder 32. Fluid is pumped into the interior around the poppet valve and the running tool is disconnected from the bridge plug and when the pressure in the tubing drops, the poppet valve 25 closes the internal pressure of the expanding rubber sleeve 32. A delayed inflation ring 37 is located in the poppet valve 25 cavity to keep the poppet valve 25 closed to prevent premature liquid setting of the expanding cartridge 32. When a predetermined pressure is reached, the safety screw 15 in the delayed inflation ring 37 will be sheared, thereby opening the poppet valve 25 and filling the expansion bladder 32 with liquid. The balance sleeve 65 provides a means of balancing the pressure on the bridge plug for releasing the bridge plug. The differential pressure above and below the bridge plug will be relieved by the balance sleeve 65, preventing the tool from being washed out by the differential pressure downhole when released. The invention enables the expansion rubber sleeve to expand and retract through the sealing and the unsealing of the valve and the mandrel, can realize the temporary bridge plug under the condition of selecting a well section and not needing to put forward a production oil pipe, and has the advantages of simple operation, safety, reliability, simple operation, safety and reliability.
Example 2
Preferably, on the basis of embodiment 1, the lower end of the mandrel 36 is connected with a pilot cone 42, the pilot cone 42 is in threaded connection with the mandrel 36, and the lower end of the pilot cone 42 is conical.
In the practical use process, the guide cone 42 ensures the safe running of the tool and prevents the tool from being blocked with the well wall.
Preferably, the element bottom connector 33 is provided with a pressure relief hole 34.
In actual use, the pressure relief hole 34 can release the pressure difference above and below the bridge plug, and the tool is prevented from being flushed out by the pressure difference at the bottom of the well when the tool is released.
Preferably, the shearing adapter 57 is provided with a shearing screw iii 56 and a shearing ring 58, and the shearing ring 58 is connected with the mandrel 36 through the shearing screw iii 56. Preferably, a late inflation ring 37 is located in the poppet valve 25 cavity, keeping the poppet valve 25 closed.
In actual use, the delayed inflation ring 37 is located in the poppet valve 25 cavity to keep the poppet valve 25 closed. To prevent premature liquid setting of the expansion bladder 32. When a predetermined pressure is reached, the safety screw 15 in the delayed inflation ring 37 will be sheared, thereby opening the poppet valve 25 and filling the expansion bladder 32 with liquid.
The rubber cylinder 32 mainly comprises an outer rubber cylinder 32, an inner rubber cylinder 32, a laminated steel belt, a pressure head and a tension hoop, particularly, the laminated steel belt is a hollow cylindrical structure formed by stacking a plurality of steel sheets, each steel sheet is of an involute-shaped curved surface structure, and a specific structural form of limiting and fixing is carried out through steps and inclined planes, so that on one hand, the steel sheets can be completely attached to each other in the process of stacking, no gap is reserved, the stress state is best, and the pressure resistance is highest; on the other hand, the expansion rate of the rubber sleeve 32 is good, and practical tests prove that the expansion rate can reach 2.5, so that the special well section is particularly suitable for complex-condition special well sections needing to penetrate through the upper small drift diameter part to plug the lower large drift diameter well section.
Example 3
Preferably, on the basis of embodiment 2, further, the number of the outer rubber cylinders 32 is multiple, the multiple outer rubber cylinders 32 are arranged at intervals, and the outer rubber cylinders 32 are cladded on the laminated steel strip. By analyzing the existing raw materials of the rubber cylinder 32 and the manufacturing process of the rubber cylinder 32, the raw materials of the rubber cylinder 32 suitable for the requirements of high temperature and high expansion ratio are the rubber cylinder 32 mainly made of modified HNBR, preferably imported high hydrogen HNBR raw rubber, an adhesive, a filling system, a vulcanization system and an acid absorbent, the elongation change rate is expected to be 400% after aging, and the rubber cylinder 32 is suitable for high-polymer elastomer materials for performing high-expansion high-pressure sealing operation in a high-temperature environment. The laminated steel strip is preferably a high toughness high strength steel strip material Inconel 718. The structural form of the high-hydrogen HNBR crude rubber and the laminated steel strip are combined for use, and practical tests prove that the bridge plug with the outer diameter of 63.5mm can block the sleeve with the inner diameter of 195mm, so that the technical effect that the expansion rate reaches 3.0 can be realized.
Example 4
On the basis of the embodiments 2 and 3, a method for using the recyclable bridge plug uses any one of the recyclable bridge plugs, and comprises the following specific processes:
s1: the installation before the recoverable bridge plug enters the well;
the recoverable bridge plug is required to be carefully checked and maintained when entering the well, lubricating grease is required to be smeared on each movable part to ensure flexibility and effectiveness, and meanwhile, whether the shearing screw I15 and the shearing screw II 17 are intact or not is checked, the damaged shearing screw I and the damaged shearing screw II are required to be replaced in time, and whether the rubber cylinder 32 is in a shrinkage state or not is checked;
s2: the well can be filled with the bridge plug;
after the recoverable bridge plug is qualified by ground inspection, the upper valve sleeve 61 is arranged at the foremost end of the operation pipe column and enters a well, and the drilling speed is strictly controlled to be not more than 0.5m/s in the lowering process;
s3: the bridge plug can be recovered for setting;
after the recyclable bridge plug is put in place, the recyclable bridge plug starts to be pressed and set, an upper valve 61 of the bridge plug is kept open by a feeding tool, and liquid enters the interior of the bridge plug expansion rubber cylinder 32 from the upper valve 61; when a preset pressure is reached, the safety screw in the tool is sheared, the piston moves downwards to release a chuck pawl which locks the running tool to the bridge plug, meanwhile, the poppet valve 25 is closed by the upward thrust of the return spring 66 to lock the liquid entering the expansion rubber cylinder 32, the bridge plug is set, the pressure in the oil pipe is reduced, and the pipe column is disconnected;
s4: the bridge plug can be recovered for unsealing;
after the operation is finished, the pipe column is connected with a recovery tool, after the pipe column is lowered to the position of the bridge plug, the pipe column is pressed downwards to apply force to enable the sleeve on the recovery tool to be in contact with the balance sleeve 65 on the bridge plug, when the current pressure reaches a preset value, the shearing pin 17 on the balance sleeve 65 is sheared, the balance sleeve 65 moves downwards, the pressure difference between the upper portion and the lower portion of the bridge plug is balanced, liquid in the expansion rubber cylinder 32 is released, and the tool is unsealed and retracted.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A retrievable bridge plug, comprising: including the top connection and the bridging plug body that connect gradually, wherein:
the upper connector comprises a balance mandrel (64), a balance sleeve (65) and an upper mandrel (30), the balance sleeve (65) is arranged outside the balance mandrel (64) and connected through a shear screw II (17), the lower end of the balance mandrel (64) is connected with the upper mandrel (30), the balance mandrel (64) is internally communicated, and an upper valve sleeve (61), an upper valve sleeve spring (66) and a lower valve shaft adapter (67) are sequentially arranged;
the bridge plug body comprises a bumper shell (20), a chuck connector (24), a poppet valve shell (40) and a connector (29), wherein a lower valve shaft (68), a lower valve (69) and a mandrel (36) are arranged in the bridge plug body, a mandrel sleeve (70) is arranged on the outer side of the upper part of the mandrel (36), and a rubber cylinder (32), an element bottom connector (33) and a shearing adapter (57) are sequentially arranged on the outer side of the middle-lower part; the lifting valve shell (40) is internally provided with a lifting valve (25), a lifting spring (31) and a delay inflating ring (37), and the delay inflating ring (37) is connected with the connector (29) through a shear screw I (15).
2. A retrievable bridge plug according to claim 1, wherein: packing element (32) mainly by outer packing element (32), interior packing element (32), stromatolite steel band, pressure head and tension hoop constitute, the stromatolite steel band be located between packing element (32) and outer packing element (32), the stromatolite steel band be by a plurality of steel sheet through piling up the hollow cylinder structure that forms, every steel sheet is involute-shaped's curved surface structure, the hollow cylinder of pressure head for having outer step, the one end of the inner wall of pressure head is the inclined plane, the inner wall one end of pressure head is passed through inclined plane and interior packing element (32) contact cooperation, the other end of pressure head with the tip welded fastening of stromatolite steel band, tension hoop is for having the hollow cylinder of interior step, and tension hoop cover is established the outer wall of packing element (32), pressure head and stromatolite steel band, and tension hoop passes through interior step carries on spacing fixedly with the cooperation of the outer step of pressure head.
3. A retrievable bridge plug according to claim 2, wherein: the laminated steel strip is made of an alloy with the model number of Inconel 718; the rubber cylinder (32) is made of high-hydrogen HNBR crude rubber.
4. A retrievable bridge plug according to claim 1, wherein: the lower end of the mandrel (36) is connected with a guide cone (42), the guide cone (42) is in threaded connection with the mandrel (36), and the lower end of the guide cone (42) is conical.
5. A retrievable bridge plug according to claim 1, wherein: and a pressure relief hole (34) is formed in the element bottom connector (33).
6. A retrievable bridge plug according to claim 1, wherein: the shearing adapter (57) is provided with a shearing screw III (56) and a shearing ring (58), and the shearing ring (58) is connected with the mandrel (36) through the shearing screw III (56).
7. A retrievable bridge plug according to claim 1, wherein: the delayed inflation ring (37) is positioned in the inner cavity of the poppet valve (25) and keeps the poppet valve (25) closed; the lifting spring (31) is positioned outside the lifting valve (25), and the lower part of the lifting spring (31) is connected with the delay inflation ring (37).
8. A retrievable bridge plug according to claim 1, wherein: the upper sleeve spring (66) is located within a cavity formed by the upper sleeve (61), the lower valve shaft adapter (67) and the balance spindle (64).
9. A retrievable bridge plug according to claim 1, wherein: the outer diameters of the bumper shell (20), the chuck joint (24), the poppet valve shell (40) and the connector (29) are the same as that of the guide cone (42) and are larger than that of the balance sleeve (65); the bumper shell (20), the chuck joint (24), the poppet valve shell (40) and the connector (29) are in threaded connection.
10. Use of a retrievable bridge plug according to any one of claims 1 to 9, wherein: the method comprises the following steps:
s1: the installation before the recoverable bridge plug enters the well;
before the recoverable bridge plug is put into a well, checking and maintaining, smearing lubricating grease on each movable part, checking whether the shearing screw I (15) and the shearing screw II (17) are intact, and checking whether the rubber cylinder (32) is in a shrinkage state;
s2: the well can be filled with the bridge plug;
after the recoverable bridge plug is qualified by ground inspection, an upper valve sleeve (61) is arranged at the foremost end of the operation pipe column and enters a well;
s3: the bridge plug can be recovered for setting;
after the recyclable bridge plug is put in place, the recyclable bridge plug starts to be pressed and set, an upper valve (61) of the bridge plug is kept open by a feeding tool, and liquid enters the inside of the bridge plug expansion rubber cylinder (32) through the upper valve (61); when a preset pressure is reached, the safety screw in the feeding tool is sheared, the piston moves downwards to release a chuck pawl which locks the running tool to the bridge plug, meanwhile, the lift valve (25) is closed by the upward thrust of the return spring (66), the liquid entering the expansion rubber sleeve (32) is locked, the bridge plug is set, the pressure in the oil pipe is reduced, and the pipe column is disconnected;
s4: the bridge plug can be recovered for unsealing;
after the operation is finished, the pipe column is connected with a recovery tool, after the pipe column is lowered to the position of a bridge plug, the pipe column is pressed downwards to apply force to enable a sleeve on the recovery tool to be in contact with a balance sleeve (65) on the bridge plug, when the lower pressure reaches a preset value, a shearing pin (17) on the balance sleeve (65) is sheared, the balance sleeve (65) moves downwards, the pressure difference between the upper portion and the lower portion of the bridge plug is balanced, liquid in an expansion rubber cylinder (32) is released, and the tool is unlocked and retracted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110294530.1A CN113073958B (en) | 2021-03-19 | 2021-03-19 | Recyclable bridge plug and using method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110294530.1A CN113073958B (en) | 2021-03-19 | 2021-03-19 | Recyclable bridge plug and using method |
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| CN113073958A true CN113073958A (en) | 2021-07-06 |
| CN113073958B CN113073958B (en) | 2023-04-07 |
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| CN202110294530.1A Active CN113073958B (en) | 2021-03-19 | 2021-03-19 | Recyclable bridge plug and using method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263234A (en) * | 2022-08-30 | 2022-11-01 | 大庆长垣能源科技有限公司 | Pressure-controlled underground switch bridge plug |
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| US4436150A (en) * | 1981-09-28 | 1984-03-13 | Otis Engineering Corporation | Bridge plug |
| CN2835545Y (en) * | 2005-07-04 | 2006-11-08 | 徐建 | Recoverable bridge plug |
| US20110036564A1 (en) * | 2009-08-11 | 2011-02-17 | Weatherford/Lamb, Inc. | Retrievable Bridge Plug |
| CN102900395A (en) * | 2011-07-29 | 2013-01-30 | 扬州市驰城石油机械有限公司 | Hydraulic packer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263234A (en) * | 2022-08-30 | 2022-11-01 | 大庆长垣能源科技有限公司 | Pressure-controlled underground switch bridge plug |
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| Publication number | Publication date |
|---|---|
| CN113073958B (en) | 2023-04-07 |
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