CN114809976B - Soluble packer and multistage sliding sleeve fracturing string - Google Patents
Soluble packer and multistage sliding sleeve fracturing string Download PDFInfo
- Publication number
- CN114809976B CN114809976B CN202110081357.7A CN202110081357A CN114809976B CN 114809976 B CN114809976 B CN 114809976B CN 202110081357 A CN202110081357 A CN 202110081357A CN 114809976 B CN114809976 B CN 114809976B
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- packer
- soluble
- cylinder
- slip
- piston
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- 238000007789 sealing Methods 0.000 claims abstract description 74
- 239000007788 liquid Substances 0.000 claims abstract description 40
- 230000007246 mechanism Effects 0.000 claims abstract description 29
- 239000007769 metal material Substances 0.000 claims abstract description 11
- 230000009471 action Effects 0.000 claims description 11
- 239000004576 sand Substances 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims 4
- 210000001503 joint Anatomy 0.000 claims 1
- 229920003169 water-soluble polymer Polymers 0.000 claims 1
- 238000010276 construction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000004873 anchoring Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000020477 pH reduction Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/1265—Packers; Plugs with fluid-pressure-operated elastic cup or skirt with mechanical slips
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The invention provides a soluble packer and a multistage sliding sleeve fracturing string, wherein the soluble packer comprises a central tube, a sealing mechanism and a setting mechanism, and a plurality of liquid inlets are formed in the lower part of the tube wall of the central tube; the sealing mechanism comprises a cone made of a soluble metal material, a sealing ring and a slip assembly, the cone is sleeved outside the central tube, the sealing ring is sleeved outside the cone, the slip assembly is sleeved outside the central tube and positioned below the cone, and the slip assembly can be abutted against the sealing ring; the setting mechanism comprises a pushing cylinder and a hydraulic cylinder, the pushing cylinder is sleeved outside the central pipe, the upper end of the pushing cylinder is abutted against the lower end of the slip assembly, the hydraulic cylinder comprises a cylinder barrel and a piston, the upper end of the cylinder barrel is connected with the lower end of the pushing cylinder, the piston is sleeved at the lower end of the central pipe and is communicated with the central pipe, and the liquid inlet is positioned above the piston and is communicated with the cylinder barrel. After the sealing mechanism is used, the sealing mechanism can be fully dissolved, so that the problem of difficult oil and gas well packer deblocking is effectively solved.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a soluble packer and a multistage sliding sleeve fracturing string containing the same.
Background
The packer mainly realizes the isolation production layer or the construction target layer, prevents the fluid and the pressure between layers from interfering with each other, adapts to the construction needs of various layering technologies, has the application range almost extending to various production links of exploration and development, and especially in the field of oil and gas field reconstruction, the packer sectional reconstruction is one of important technologies for realizing effective multi-layer and multi-section utilization of low-permeability and compact oil and gas reservoirs. After the packer is completed in the packing function, a well bore needs to be lifted out, and the problem that the packer is difficult to unseal is caused by various reasons such as underground corrosion and scaling, sand setting and the like, so that the production of an oil-gas well and the later overhaul and replacement of the pipe column are affected.
Disclosure of Invention
The invention aims to provide a soluble packer capable of effectively solving the problem of difficult oil and gas well packer deblocking.
Another object of the invention is to provide a multistage sliding sleeve fracturing string comprising the soluble packer
To achieve the above object, the present invention provides a soluble packer comprising:
the lower part of the pipe wall of the central pipe is provided with a plurality of liquid inlets;
the sealing mechanism comprises a cone made of a soluble metal material, a sealing ring and a slip assembly, wherein the cone is sleeved outside the central tube, the sealing ring is sleeved outside the cone, the slip assembly is movably sleeved outside the central tube and is positioned below the cone, and the slip assembly can be matched with the cone and can be abutted against the sealing ring;
the setting mechanism comprises a pushing cylinder and a hydraulic cylinder, wherein the pushing cylinder is sleeved outside the central tube, the upper end of the pushing cylinder is abutted to the lower end of the slip assembly, the hydraulic cylinder comprises a cylinder barrel and a piston arranged in the cylinder barrel, the upper end of the cylinder barrel is connected with the lower end of the pushing cylinder, the piston is sleeved at the lower end of the central tube and is communicated with the central tube, and the liquid inlet is positioned above the piston and is communicated with the cylinder barrel.
The soluble packer is characterized in that an outer lock catch is detachably connected to the outer peripheral surface of the central tube, an inner lock catch is connected to the inner surface of the push cylinder, and the outer lock catch can be in locking fit with the inner lock catch.
The soluble packer is characterized in that a deblocking sleeve is sleeved outside the central tube, the deblocking sleeve is connected with the central tube through a deblocking pin, and the outer lock catch is connected to the outer circumferential surface of the deblocking sleeve.
The soluble packer is characterized in that the outer part of the sealing ring is sleeved with a rubber auxiliary sealing ring.
The soluble packer comprises a slip assembly, a plurality of slip segments and a hoop, wherein the slip assembly comprises a slip seat, the slip seat is sleeved outside the central tube, the lower end of each slip segment is connected with the slip seat, the hoop is sleeved outside a plurality of slip segments, and a plurality of slip segments are gathered through the hoop and are abutted against the outside of the central tube.
A soluble packer as described above, wherein the slip segments have slip teeth that are bi-directional.
The soluble packer comprises a central pipe and a lower pipe connected to the lower end of the upper pipe, wherein the liquid inlet is formed in the pipe wall of the lower pipe, the upper end of the upper pipe is connected with an upper joint, an adjusting ring is sleeved outside the upper joint, and the upper end of the cone is abutted to the lower end of the adjusting ring.
The soluble packer comprises a push cylinder, wherein the upper end of the push cylinder is connected with a top ring, and the push cylinder is abutted with the slip assembly through the top ring.
The soluble packer comprises a plurality of hydraulic cylinders which are sequentially connected from top to bottom, each cylinder barrel is sequentially connected from top to bottom, each piston is sequentially connected and communicated from top to bottom, the uppermost cylinder barrel is connected with the pushing barrel, the uppermost piston is connected and communicated with the lower end of the central tube, the lower end of the lowermost cylinder barrel is detachably connected with a cylinder cover, the lower part of each piston is provided with a liquid inlet which can be communicated with the cylinder barrel connected below the cylinder barrel, and the liquid inlet is positioned above the piston connected below the liquid inlet.
The invention also provides a multistage sliding sleeve fracturing string which comprises an oil pipe, a first packer, at least one group of fracturing components and a constant pressure sand ejector which are sequentially connected from top to bottom, wherein the fracturing components comprise a sliding sleeve, a second packer and a sliding sleeve seat which are sequentially connected from top to bottom, and the first packer and the second packer are both the soluble packer.
Compared with the prior art, the invention has the following advantages:
the soluble packer can be used for multi-layer, multi-stage fracturing and acidification of an oil and gas well, can also be used for separate-layer water injection, can be used for fixed pipe column construction, can also be used for a tripping pipe column, can be used for a casing well and an open hole well, and has wide application range;
the soluble packer is made of the soluble metal material, and the sealing mechanism can be fully dissolved after the soluble packer is used, so that the soluble packer can be smoothly unsealed, a well bore is ensured to be unblocked, and the problem that the oil and gas well packer is difficult to unseal is effectively solved;
the soluble packer is locked by self-locking formed by the sealing mechanism and double locking formed by locking and matching of the outer lock catch and the inner lock catch, so that the sealing and anchoring reliability of the soluble packer is ensured;
according to the soluble packer, the rubber auxiliary sealing ring is sleeved outside the sealing ring, so that the sealing performance of the soluble packer is improved, the pressure bearing capacity of the soluble packer is improved, the soluble packer is not affected by high temperature in the well, and the reliability is high;
the multistage sliding sleeve fracturing string provided by the invention adopts the soluble packer, does not need a hydraulic anchor, simplifies the string structure and reduces the construction risk.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention. Wherein:
FIG. 1 is a schematic illustration of the construction of a soluble packer of the present invention;
FIG. 2 is a schematic view of the structure of the locking engagement of the inner shackle with the outer shackle;
fig. 3 is a schematic structural view of a multi-stage sliding sleeve fracturing string of the present invention.
Reference numerals illustrate:
100. a central tube; 110. an upper pipe; 120. a lower pipe; 121. a liquid inlet hole; 122. deblocking the envelope; 123. an outer lock catch; 124. deblocking the pin; 130. an upper joint; 131. an adjusting ring;
200. a sealing mechanism; 210. a cone; 220. a seal ring; 221. a rubber auxiliary sealing ring; 230. a slip assembly; 231. slip seat; 2311. a clamping groove; 232. slip segments; 2321. slip teeth; 233. a hoop;
300. a setting mechanism; 310. pushing a cylinder; 311. an inner lock catch; 320. a hydraulic cylinder; 321. a cylinder; 322. a piston; 3221. a liquid inlet; 323. a cylinder cover; 324. setting shear pins; 325. a seal ring group; 330. a top ring;
10. an oil pipe;
20. a first packer;
30. a fracturing assembly; 31. a sliding sleeve; 32. a second packer; 33. a sliding sleeve seat;
40. a constant pressure sand blaster.
Detailed Description
For a clearer understanding of the technical solutions, objects and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings. Wherein the use of the adjective or adverb modifiers "upper" and "lower," "top" and "bottom," "inner" and "outer" are merely for convenience of relative reference between groups of terms, and do not describe any particular directional limitation on the modified term. In addition, the terms "first," "second," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby features defining "first," "second," etc. may explicitly or implicitly include one or more such features. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
As shown in fig. 1, the present invention provides a soluble packer comprising a base pipe 100, a sealing mechanism 200, and a setting mechanism 300, wherein:
the lower part of the pipe wall of the central pipe 100 is provided with a plurality of liquid inlets 121, preferably, the number of the liquid inlets 121 is 2-6, and the liquid inlets 121 are arranged at equal intervals along the circumferential direction of the central pipe 100;
the sealing mechanism 200 comprises a cone 210 made of a soluble metal material, a sealing ring 220 and a slip assembly 230, wherein the soluble metal material is magnesium aluminum alloy, the magnesium aluminum alloy has good ductility and can be dissolved under the action of liquid in a well within a certain time, when in actual use, the dissolution time of the soluble metal material can be adjusted according to construction requirements, the specific adjustment method is the prior art, and is not repeated herein, the cone 210 is sheathed outside the central tube 100, namely, the cone 210 cannot move relative to the central tube 100, the cone 210 is in a reduced diameter shape gradually reduced from top to bottom, the sealing ring 220 is sheathed outside the cone 210, the sealing ring 220 can move along the axial direction of the cone 210, the slip assembly 230 can be sheathed outside the central tube 100 and is positioned below the cone 210, the slip assembly 230 can be matched with the cone 210 and can be abutted with the sealing ring 220, in particular, the lower end of the cone 210 is inserted between the slip assembly 230 and the central tube 100, the angle of the cone 210 is matched with the conical surface angle of the slip block 232 assembly, when the cone assembly 230 moves upwards relative to the central tube 100, the slip assembly 230 can move upwards under the action of the sealing ring 210, and simultaneously radially expands the sealing ring 220 can radially downwards and can radially expand the slip assembly, and simultaneously form a sleeve pipe with the sealing ring 220, and can radially expand the sealing ring 210 synchronously under the action of the sealing ring 210;
the setting mechanism 300 comprises a push cylinder 310 and a hydraulic cylinder 320, the push cylinder 310 is movably sleeved outside the central tube 100, the upper end of the push cylinder 310 is abutted against the lower end of the slip assembly 230, the push cylinder 310 can push the slip assembly 230 to move upwards relative to the central tube 100, the hydraulic cylinder 320 comprises a cylinder 321 and a piston 322 arranged in the cylinder 321, the cylinder 321 is particularly in a cylinder shape with a small diameter changing from top to bottom, the piston 322 is in a cylinder shape with a large diameter changing from top to bottom, the upper end of the cylinder 321 is connected with the lower end of the push cylinder 310, the piston 322 is sleeved at the lower end of the central tube 100 and is communicated with the central tube 100, the upper end of the cylinder 321 and the lower end of the central tube 100 are particularly provided with external threads, the lower end of the push cylinder 310 and the upper end of the piston 322 are respectively provided with internal threads, the external threads are matched with the internal threads, the cylinder 321 is connected with the push cylinder 310, the piston 322 is connected with the central tube 100, a sealing ring group 325 is respectively arranged between the cylinder 321 and the central tube 100 and the piston 322 so as to ensure that the piston 321 and the cylinder 321 is in a large diameter changing cylinder 321 and the cylinder 322, the cylinder 322 is in a sealing liquid inlet and the sealing liquid inlet of the cylinder 322 is relatively to the central tube 100, the upper end surface of the piston 322 is pushed by the piston 321 and the piston 322, the piston 321 is relatively to the upper end of the piston 322 and the piston 322 is relatively to the central tube 100, and the upper end of the piston assembly is relatively to the piston 322 and the piston 322, and the piston 322 is relatively to the upper end of the piston assembly and the piston 322 and the piston assembly is relatively the piston 322 and the upper end and the piston assembly and the cylinder 100.
When the packer is used, high-pressure liquid is introduced into the central tube 100, the high-pressure liquid enters a space surrounded by the upper end face of the piston 322 and the cylinder barrel 321 through each liquid inlet hole 121, the piston 322 is connected with the central tube 100, so that the piston 322 cannot move relative to the central tube 100, the cylinder barrel 321 is pushed to move upwards along with continuous accumulation of the high-pressure liquid, the cylinder barrel 321 is pushed to move upwards relative to the piston 322 by the high-pressure liquid, the push barrel 310 above the cylinder barrel 321 is synchronously pushed to move upwards relative to the central tube 100 by the movement of the push barrel 310, the slip assembly 230 above the push barrel 310 is synchronously pushed to move upwards relative to the central tube 100 along with the upward movement of the slip assembly 230, the slip assembly 230 can radially expand under the action of the cone 210 to be meshed on a sleeve, and meanwhile, the sealing ring 220 can radially expand under the action of the cone 210 to form large-diameter sealing, so that the packer is anchored and the packer is completed.
The soluble packer is made of the soluble metal material, and the sealing mechanism 200 can be fully dissolved after the soluble packer is used, so that the soluble packer can be successfully unsealed, the smoothness of a shaft is ensured, and the problem of difficult unsealing of the oil-gas well packer is effectively solved.
Further, the outer circumference of the central tube 100 is connected with the outer lock catch 123, the inner surface of the push tube 310 is connected with the inner lock catch 311, the outer lock catch 123 can be in locking fit with the inner lock catch 311, specifically, as shown in fig. 2, when the slip assembly 230 is meshed with the sleeve, and the sealing ring 220 forms the large-diameter sealing mechanism 200, the outer lock catch 123 can be locked with the inner lock catch 311, so that the push tube 310 cannot move relative to the central tube 100, at this time, the slip assembly 230 can be meshed with the sleeve, and the outer circumference of the sealing ring 220 can be tightly attached to the inner surface of the sleeve, thereby effectively ensuring the sealing and anchoring reliability of the soluble packer.
Still further, as shown in fig. 1, the outer part of the central tube 100 is sleeved with a deblocking sleeve 122, the deblocking sleeve 122 is connected with the central tube 100 through deblocking pins 124, an outer lock catch 123 is connected to the outer circumferential surface of the deblocking sleeve 122, and the deblocking sleeve 122 is arranged, so that when the sealing mechanism 200 is not completely dissolved, but a soluble packer needs to be lifted out, the deblocking pins 124 can be sheared by lifting up the central tube 100, and the deblocking sleeve 122 is separated from the central tube 100, so that the locking cooperation of the outer lock catch 123 and the inner lock catch 311 does not limit the movement of the central tube 100, and further, the soluble packer can be lifted out of a well shaft smoothly.
Further, considering that the sealing ring 220 is made of a soluble metal material, when factors such as wellbore deformation occur, the sealing effect is poor, in order to solve the problem, as shown in fig. 1, a rubber auxiliary sealing ring 221 is sleeved outside the sealing ring 220, the rubber auxiliary sealing ring 221 can assist the sealing ring 220 to seal, so that the sealing performance of the soluble packer is improved, and the pressure bearing capacity of the soluble packer is improved, so that the soluble packer is not affected by high temperature in the pit, and the reliability is high.
Further, as shown in fig. 1, the slip assembly 230 includes a slip seat 231, a plurality of slip segments 232 and a collar 233, the slip seat 231 is sleeved outside the central tube 100, the lower end of each slip segment 232 is connected with the slip seat 231, specifically, the upper end of the slip seat 231 is provided with a plurality of clamping grooves 2311 corresponding to each slip segment 232 one by one, the lower end of each slip segment 232 is provided with a dovetail, each slip segment 232 is connected with the slip seat 231 through the clamping fit of the dovetail and the clamping groove 2311, the collar 233 is sleeved outside the slip segments 232, the slip segments 232 are gathered and abutted against the outside of the central tube 100 through the collar 233, preferably, the slip assembly 230 includes two collars 233, the two collars 233 are arranged at intervals to ensure that the plurality of slip segments 232 can be firmly gathered together during the well descending process, and the two collars 233 can be spread under the action of the cone 210 to enable each slip segment 232 to be engaged with the sleeve.
Further, as shown in fig. 1, the slip segments 232 have bi-directional slip segments 2321, and the bi-directional slip segments 2321 can bear forces in an up-down direction, so that the soluble packer can bear an upper pressure as a bottom seal packer or a lower pressure as an upper seal packer when in use.
Further, as shown in fig. 1, the central pipe 100 includes an upper pipe 110 and a lower pipe 120 connected to the lower end of the upper pipe 110, the upper end of the pipe is connected with an upper joint 130, an adjusting ring 131 is sleeved outside the upper joint 130, specifically, the upper and lower ends of the upper pipe 110 are both provided with upper pipe external threads, the upper end of the lower pipe 120 is provided with lower pipe internal threads, the lower end of the upper joint 130 is provided with joint internal threads and joint external threads, the upper end of the adjusting ring 131 is provided with adjusting internal threads, the upper pipe 110 is connected with the lower pipe 120 through the threaded fit of the lower pipe internal threads and the joint internal threads, the upper pipe 110 is connected with the upper joint 130 through the threaded fit of the joint external threads and the adjusting internal threads, the adjusting ring 131 is connected with the upper joint 130, and the threaded connection mode is simple, convenient and reliable, so that the assembly of the soluble packer becomes simple and convenient; the liquid inlet 121 is disposed on the wall of the lower pipe 120, the upper end of the cone 210 abuts against the lower end of the adjusting ring 131, that is, the upper and lower ends of the cone 210 can be limited by the adjusting ring 131 and the slip assembly 230 respectively, so that the cone 210 cannot move relative to the central pipe 100 during the running and setting process.
Still further, as shown in fig. 1, the lower tube 120 includes a first tube section, a second tube section and a third tube section sequentially connected from top to bottom, the outer diameter of the first tube section is larger than that of the second tube section, the outer diameter of the second tube section is larger than that of the third tube section, the lower tube 120 is internally threaded on the third tube section, the inner surface of the push tube 310 is attached to the outer circumferential surface of the third tube section, so as to prevent impurities from entering between the push tube 310 and the lower tube 120, the deblocking sleeve 122 is connected to the outer circumferential surface of the second tube section, and the piston 322 is screwed to the outer portion of the third tube section.
Further, as shown in fig. 1, the upper end of the push cylinder 310 is connected with a top ring 330, the push cylinder 310 is abutted with the slip assembly 230 through the top ring 330, and the top ring 330 can increase the contact area between the push cylinder 310 and the slip assembly 230, so that the reliability of pushing the slip assembly 230 by the push cylinder 310 is improved.
Further, as shown in fig. 1, the setting mechanism 300 includes a plurality of hydraulic cylinders 320 sequentially connected from top to bottom, each cylinder 321 is sequentially connected and communicated from top to bottom, specifically, two adjacent cylinders 321 are connected and communicated by threads, two adjacent pistons 322 are connected and communicated by threads, the uppermost cylinder 321 is connected with the pushing cylinder 310, the uppermost piston 322 is connected and communicated with the lower end of the central tube 100, the lower end of the lowermost cylinder 321 is detachably connected with a cylinder cover 323, specifically, the cylinder cover 323 is connected with the cylinder 321 by a setting shear pin 324, the piston 322 is limited by the cylinder cover 323 so that the piston 322 cannot be separated from the cylinder 321 in the process of being lowered, a liquid inlet 3221 capable of being communicated with the cylinder 321 connected below the piston 322 is arranged at the lower part of each piston 322, the liquid inlet 3221 is located above the piston 322 connected below the liquid inlet 322, and high-pressure liquid can enter a space where the upper end surface of the piston 322 is combined with the cylinder 321 by the liquid inlet 3221 so as to push the piston 322 to move upwards relatively to the cylinder 322.
In the present invention, only one hydraulic cylinder 320 may be provided, that is, the setting of the soluble packer is driven by a single hydraulic cylinder 320, at this time, the lower end of the cylinder 321 may be connected to the cylinder cover 323 through a setting shear pin 324, or the lower end of the cylinder 321 may be sealed, so that the lower portion of the piston is connected to the lower end of the cylinder 321 through the setting shear pin 324; when the setting force does not meet the requirement, a plurality of hydraulic cylinders 320, such as two or three, are arranged to form two-stage hydraulic drive or three-stage hydraulic drive, and during assembly, only the cylinder 321 of the upper stage hydraulic cylinder 320 is in threaded connection with the cylinder 321 of the lower stage hydraulic cylinder 320, the piston 322 of the upper stage hydraulic cylinder 320 is in threaded connection with the piston 322 of the lower stage hydraulic cylinder 320, and the liquid inlet 3221 of the upper stage piston 322 is communicated with the space enclosed by the upper end surface of the lower stage piston 322 and the cylinder 321.
The setting and unsetting process of the soluble packer of the present invention is specifically described below with reference to the accompanying drawings:
as shown in fig. 1, when in use, high-pressure liquid is introduced into the central tube 100, the high-pressure liquid enters a space surrounded by the upper end surface of the piston 322 and the cylinder barrel 321 through each liquid inlet 121 and each liquid inlet 3221, and as the piston 322 is connected with the central tube 100, the piston 322 cannot move relative to the central tube 100, the sealing ring 220 can be radially expanded under the action of the cone 210 to form a large-diameter seal along with the continuous accumulation of the high-pressure liquid, the cylinder barrels 323 and the lowermost cylinder barrel 321 are sheared, the high-pressure liquid can push each cylinder barrel 321 to move upwards, the movement of the cylinder barrel 321 synchronously pushes the push barrel 310 above the cylinder barrel 321 to move upwards relative to the central tube 100, the movement of the push barrel 310 synchronously pushes the slip assembly 230 above the push barrel 310 to move upwards relative to the central tube 100, and as the slip assembly 230 moves upwards, the slip assembly 230 can radially expand under the action of the cone 210 so as to be engaged on the sleeve, the slip assembly 230 can push the sealing ring 220 synchronously move upwards relative to the central tube 100, the sealing ring 220 can radially expand under the action of the cone 210 to form a large-diameter seal, anchor the lockable packer, and the locking device 123 is matched with the inner sealing ring 311, and the locking function is completed;
after the soluble packer is constructed, the sealing mechanism 200 begins to dissolve and lose sealing and anchoring functions, at this time, the central tube 100 is lifted up, so that the unsealing shear pins connecting the unsealing sleeve 122 and the central tube 100 are sheared, namely, the locking mechanism fails, at this time, the soluble packer can be lifted out of the well bore, and if the time of the soluble packer in the well bore is continuously prolonged, the sealing mechanism 200 of the soluble packer can be basically dissolved, and smooth lifting of the packer out of the well bore is ensured.
As shown in fig. 3, the present invention further provides a multi-stage sliding sleeve fracturing string, which includes an oil pipe 10, a first packer 20, at least one group of fracturing components 30 and a constant pressure sand blaster 40 sequentially connected from top to bottom, the fracturing components 30 include a sliding sleeve 31, a second packer 32 and a sliding sleeve seat 33 sequentially connected from top to bottom, the first packer 20 and the second packer 32 are all soluble packers as described above, specifically, the number of the fracturing components 30 is set according to actual use requirements, for example, five groups of fracturing components 30 are set, six-stage fracturing can be completed, and if one string cannot fracture all layers due to the influence of displacement and the inner diameter of the sliding sleeve 31, multiple fracturing strings can be used.
The multistage sliding sleeve fracturing string provided by the invention adopts the soluble packer, does not need a hydraulic anchor, simplifies the string structure and reduces the construction risk.
The use process of the multistage sliding sleeve fracturing string disclosed by the invention is specifically described below with reference to the accompanying drawings:
as shown in fig. 3, in this embodiment, the multi-stage sliding sleeve fracturing string includes two sets of fracturing components 30, the two sets of fracturing components 30 being a primary fracturing component and a secondary fracturing component, respectively, when in use:
the method comprises the steps of firstly, according to the position of a perforation interval, a multi-stage sliding sleeve fracturing string is lowered to a proper position of a shaft, a constant pressure sand ejector 40 is arranged at a first section perforation position, and a first stage fracturing assembly and a second stage fracturing assembly are respectively arranged at a second section perforation position and a third section perforation position;
secondly, pressing the oil pipe 10, and setting all soluble packers;
thirdly, continuously pressing the oil pipe 10, opening a constant pressure sand blower 40, and performing first-stage fracturing;
fourth, after the first stage of fracturing is completed, a first stage of fracturing ball is thrown at a wellhead, a first stage of fracturing sliding sleeve 31 is opened, the fracturing ball falls onto a first stage of sliding sleeve seat 33, the first stage of fracturing is sealed, and the second stage of fracturing is carried out;
fifthly, sequentially completing fracturing of the second section and the third section;
and sixthly, after fracturing, the wellhead is opened, the fracturing string can be used as a production string to be left in the well, and the string can be lifted up to enable the soluble packer to be unsealed and a multistage sliding sleeve fracturing string to be lifted up according to requirements.
In summary, the soluble packer can be used for multi-layer, multi-stage fracturing and acidification of oil and gas wells, can also be used for separate-layer water injection, can be used for fixed pipe string construction, can also be used for a drilling pipe string, can be used for cased wells and open hole wells, and has wide application range;
the soluble packer is made of the soluble metal material, and the sealing mechanism can be fully dissolved after the soluble packer is used, so that the soluble packer can be smoothly unsealed, a well bore is ensured to be unblocked, and the problem that the oil and gas well packer is difficult to unseal is effectively solved;
the soluble packer is locked by self-locking formed by the sealing mechanism and double locking formed by locking and matching of the outer lock catch and the inner lock catch, so that the sealing and anchoring reliability of the soluble packer is ensured;
according to the soluble packer, the rubber auxiliary sealing ring is sleeved outside the sealing ring, so that the sealing performance of the soluble packer is improved, the pressure bearing capacity of the soluble packer is improved, the soluble packer is not affected by high temperature in the well, and the reliability is high;
the multistage sliding sleeve fracturing string provided by the invention adopts the soluble packer, does not need a hydraulic anchor, simplifies the string structure and reduces the construction risk.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention. It should be noted that, the components of the present invention are not limited to the above-mentioned overall application, and each technical feature described in the specification of the present invention may be selected to be used singly or in combination according to actual needs, so that other combinations and specific applications related to the present invention are naturally covered by the present invention.
Claims (8)
1. A soluble packer, the soluble packer comprising:
the lower part of the pipe wall of the central pipe is provided with a plurality of liquid inlets;
the sealing mechanism comprises a cone made of a soluble metal material, a sealing ring and a slip assembly, wherein the cone is sleeved outside the central tube, the sealing ring is sleeved outside the cone, the slip assembly is movably sleeved outside the central tube and is positioned below the cone, and the slip assembly can be matched with the cone and can be abutted against the sealing ring;
the setting mechanism comprises a pushing cylinder and a hydraulic cylinder, the pushing cylinder is sleeved outside the central pipe, the upper end of the pushing cylinder is abutted against the lower end of the slip assembly, the hydraulic cylinder comprises a cylinder barrel and a piston arranged in the cylinder barrel, the upper end of the cylinder barrel is connected with the lower end of the pushing cylinder, the piston is sleeved at the lower end of the central pipe and communicated with the central pipe, and the liquid inlet is positioned above the piston and communicated with the cylinder barrel;
the sealing ring is provided with an inner conical surface and can move along the axial direction of the cone, and the angle of the cone is matched with the angle of the inner conical surface of the sealing ring;
when the slip assembly moves upwards relative to the central pipe, the slip assembly can radially expand under the action of the cone, meanwhile, the slip assembly pushes the sealing ring to synchronously move upwards relative to the central pipe, and the sealing ring can radially expand under the action of the cone to form a large-diameter seal;
the sealing ring is made of a soluble metal material;
an outer lock catch is detachably connected to the outer peripheral surface of the central tube, an inner lock catch is connected to the inner surface of the push cylinder, and the outer lock catch can be in locking fit with the inner lock catch;
the outer part of the central tube is sleeved with a deblocking sleeve, the deblocking sleeve is connected with the central tube through a deblocking pin, and the outer lock catch is connected to the outer peripheral surface of the deblocking sleeve; the deblocking sleeve is arranged so that when the sealing mechanism is not completely dissolved, but the soluble packer needs to be lifted out, the deblocking pin can be sheared by lifting up the central tube, the release sleeve is separated from the central tube, so that the outer lock catch and the inner lock catch are in locking fit without limiting the movement of the central tube, and the soluble packer can be smoothly pulled out of a shaft.
2. The soluble packer of claim 1, wherein the polymer composition,
the outside of sealing ring has cup jointed rubber auxiliary seal circle.
3. The soluble packer of claim 1, wherein the polymer composition,
the slip assembly comprises slip seats, a plurality of slip blocks and hoops, wherein the slip seats are sleeved outside the central tube, the lower ends of the slip blocks are connected with the slip seats, the hoops are sleeved outside the slip blocks, and the slip blocks are gathered together through the hoops and are attached to the outside of the central tube.
4. The soluble packer of claim 3, wherein the water-soluble polymer is selected from the group consisting of,
the slip segments have bi-directional slip teeth.
5. The soluble packer of claim 1, wherein the polymer composition,
the center tube comprises an upper tube and a lower tube connected to the lower end of the upper tube, the liquid inlet is formed in the tube wall of the lower tube, the upper end of the upper tube is connected with an upper joint, an adjusting ring is sleeved outside the upper joint, and the upper end of the cone is abutted to the lower end of the adjusting ring.
6. The soluble packer of claim 1, wherein the polymer composition,
the upper end of the pushing cylinder is connected with a top ring, and the pushing cylinder is in butt joint with the slip assembly through the top ring.
7. The soluble packer of any one of claims 1 to 6, wherein,
the setting mechanism comprises a plurality of hydraulic cylinders which are sequentially connected from top to bottom, each cylinder barrel is sequentially connected from top to bottom, each piston is sequentially connected and communicated from top to bottom, the uppermost cylinder barrel is connected with the pushing barrel, the uppermost piston is connected and communicated with the lower end of the central tube, the lower end of the lowermost cylinder barrel is detachably connected with a cylinder cover, the lower part of each piston is provided with a liquid inlet which can be communicated with the cylinder barrel connected to the lower part of the piston, and the liquid inlet is positioned above the piston connected to the lower part of the liquid inlet.
8. A multistage sliding sleeve fracturing string, characterized in that the multistage sliding sleeve fracturing string comprises an oil pipe, a first packer, at least one group of fracturing components and a constant pressure sand ejector which are sequentially connected from top to bottom, the fracturing components comprise a sliding sleeve, a second packer and a sliding sleeve seat which are sequentially connected from top to bottom, and the first packer and the second packer are the soluble packer as claimed in any one of claims 1 to 7.
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| CN202110081357.7A CN114809976B (en) | 2021-01-21 | 2021-01-21 | Soluble packer and multistage sliding sleeve fracturing string |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110081357.7A CN114809976B (en) | 2021-01-21 | 2021-01-21 | Soluble packer and multistage sliding sleeve fracturing string |
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| CN114809976B true CN114809976B (en) | 2023-12-22 |
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| CN203223203U (en) * | 2013-04-19 | 2013-10-02 | 四机赛瓦石油钻采设备有限公司 | Hanging packer for open hole completion pipe string |
| CN106639963A (en) * | 2016-12-28 | 2017-05-10 | 中国石油集团渤海钻探工程有限公司 | Degradable packer, multi-stage layering fracturing pipe column and fracturing construction method thereof |
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2021
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| US3456723A (en) * | 1967-06-30 | 1969-07-22 | Camco Inc | Hydraulically set well packer |
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| CN114809976A (en) | 2022-07-29 |
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