Fracturing and drainage integrated double-hydraulic-cylinder high-temperature-resistant and high-pressure-resistant packer

Abstract

The invention relates to the technical field of oil and gas reservoir exploitation equipment, in particular to a fracturing, drainage and exploitation integrated double-hydraulic-cylinder high-temperature-resistant and high-pressure-resistant packer which is used for solving the problem that an existing high-temperature and high-pressure oil and gas well fracturing packer and an existing drainage packer are not suitable for each other. The upper joint and the lower joint are respectively in threaded connection with the top and the bottom of the central pipe; an anchoring mechanism is arranged in the middle of the center pipe and comprises an upper cone, a lower cone and a lower cone, the lower cone is fixedly mounted on the central pipe; the slip body is connected to the central pipe and located between the upper cone and the lower cone; when the slip expanding outwards abuts against the inner wall of the casing pipe, the packer is anchored in the casing pipe, the slip anchored in the casing pipe can bear upper pressure difference and lower pressure difference at the same time through the two-way anti-retreating teeth arranged on the outer portion of the slip, and therefore the packer can be suitable for fracturing operation and liquid drainage operation at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas reservoir exploitation equipment, and particularly to a fracturing and production drainage integrated double-cylinder high-temperature and high-pressure packer. Background Art

[0002] At present, with the continuous deepening of domestic oil and gas exploration and development, the reservoir depth is getting deeper and deeper. Deep reservoirs generally have the characteristics of high temperature and high fracture pressure. Most domestic oil and gas reservoirs also have the characteristics of low porosity and low permeability, and need to be transformed by fracturing measures. Due to the water sensitivity of fracturing fluid, it is easy to damage the reservoir, and the fracturing fluid needs to be discharged from the wellbore in time after fracturing.

[0003] Hydraulic pump liquid drainage is to pump the working fluid into the well from the tubing by a ground power pump, and use the principle of generating negative pressure at the nozzle of the hydraulic pump core in the well to suck up the liquid at the bottom of the well, and then discharge it into the oil-casing annulus from the working barrel of the hydraulic pump and return it to the ground. Hydraulic pump liquid drainage has the characteristics of fast liquid drainage speed and strong capacity. Timely liquid drainage can effectively reduce the damage of fracturing fluid to the reservoir.

[0004] Limited by the power of the ground power pump, the working barrel of the hydraulic pump is generally lowered to a depth of about 3000 meters during liquid drainage. In the liquid drainage string, it is usually the case that the sand-carrying cup and the packer are successively connected below the working barrel of the hydraulic pump. When pulling out the string, if sand sticking or sand burial occurs, the working barrel of the hydraulic pump can be used as a circulation channel to achieve circulation and release of the stuck, facilitating the pulling out of the string. In conventional oil and gas wells, the packer is lowered to a relatively shallow depth, and the requirements for the temperature resistance grade and pressure-bearing grade of the packer for hydraulic pump liquid drainage are relatively low. During fracturing, in order to provide effective protection for the upper casing of the oil and gas layer, it is generally required that the packer be lowered to near the top of the oil and gas layer. The packer will be lowered deeper, and the requirements for the temperature resistance grade and pressure-bearing grade of the packer are higher. In addition, during hydraulic pump liquid drainage, the packer needs to maintain the isolation of the oil-casing annulus, and the packer bears the liquid column pressure of the oil-casing annulus, that is, bears the upper pressure difference. The purpose is to prevent the liquid sucked up from the bottom of the well from falling back to the bottom of the well and circulating repeatedly, resulting in ineffective liquid drainage. While the fracturing packer generally bears the lower pressure difference. In view of the above problems, the common practice in high-temperature and high-pressure oil and gas wells at present is to use the Y531 high-temperature and high-pressure packer to perform a blowout after fracturing, perform a well killing operation after the blowout production liquid is low, pull out the fracturing string in the well, and then re-lower the hydraulic pump liquid drainage string for liquid drainage and production measurement. This not only increases the operation cost, but also the well killing operation will cause secondary pollution of the reservoir, resulting in a decrease in production. Therefore, there is a problem that the fracturing packer and the liquid drainage packer in high-temperature and high-pressure oil and gas wells are not applicable to each other at present. Summary of the Invention

[0005] The present invention provides a fracturing and production drainage integrated double-cylinder high-temperature and high-pressure packer to solve the problem that the fracturing packer and the liquid drainage packer in high-temperature and high-pressure oil and gas wells are not applicable to each other at present.

[0006] To alleviate the above technical problems, the technical solution provided by the present invention lies in:

[0007] A fracturing and production integrated double-cylinder high-temperature and high-pressure packer, comprising an upper joint, a central pipe and a lower joint, wherein the upper joint and the lower joint are respectively threadedly connected to the top and bottom of the central pipe; an anchoring mechanism is arranged in the middle of the central pipe, and the anchoring mechanism includes: an upper cone, slidably connected to the central pipe; a lower cone, fixedly installed on the central pipe; a slip body, connected to the central pipe and located between the upper cone and the lower cone; a two-way anti-retreat tooth is arranged outside the slip body; when the upper cone moves downward, it pushes the slip body to expand outward and anchor to the inner wall of the casing, so that the two-way anti-retreat tooth outside the slip body abuts against the inner wall of the pipe sleeve, so that the slip body is fixed in the vertical direction.

[0008] Furthermore, the anchoring mechanism further includes: a slip sleeve, the upper end of which is sleeved on the upper cone, and a connecting pin is fixedly connected between the upper cone and the upper cone, the lower end of which is sleeved on the lower cone and threadedly connected with a slip retaining ring. When the slip retaining ring is screwed tightly on the slip sleeve, the upper end of the slip retaining ring abuts against the outer convex platform of the lower cone; a plurality of springs are annularly distributed inside the slip sleeve, and both ends of the spring are respectively connected to the slip sleeve and the slip body; a groove matching with the slip body is opened on the slip sleeve. When the upper cone moves downward, the connecting pin is disconnected, and the slip body is pushed to squeeze the spring and expand outward, so that the slip body moves out of the groove of the slip sleeve.

[0009] Furthermore, it further includes a double-cylinder setting mechanism, and the double-cylinder setting mechanism includes: a connecting mandrel, sleeved on the central pipe, and an annular groove is opened on the outer wall; a first-stage cylinder body, sleeved on the connecting mandrel; a round piston, sliding in the annular cavity between the first-stage cylinder body and the connecting mandrel; a lock sleeve, threadedly connected to the top of the round piston; a round lock ring, installed in the annular groove on the outer wall of the connecting mandrel and clamped to the inner wall of the round piston; a first pressure injection hole communicating the annular cavity between the first-stage cylinder body and the connecting mandrel is opened on the central pipe and the connecting mandrel. When pressure is injected into the central pipe, the pressure is conducted through the first pressure injection hole to the annular cavity between the first-stage cylinder body and the connecting mandrel and acts on the round piston to make the first-stage cylinder body move upward.

[0010] Furthermore, the double-cylinder setting mechanism further includes: a second-stage cylinder body sleeved on the connecting mandrel, and the second-stage cylinder body is threadedly connected to the bottom of the first-stage cylinder body; a ratchet piston sliding in the annular cavity between the second-stage cylinder body and the connecting mandrel; a shear sleeve sleeved on the connecting mandrel, the upper part of the shear sleeve is threadedly connected to the bottom end of the ratchet piston, and the lower part of the shear sleeve is threadedly connected to the upper cone; a lock ring seat sleeved on the shear sleeve, and a first starting pin is fixedly connected between the lock ring seat and the shear sleeve; when the first-stage cylinder body moves upward, it drives the second-stage cylinder body to move upward synchronously, thereby shearing the first starting pin so that the lock ring seat is separated from the shear sleeve; a second pressure injection hole communicating with the annular cavity between the second-stage cylinder body and the connecting mandrel is provided on the central tube and the connecting mandrel; after the first starting pin is disconnected, continue to inject pressure into the central tube, and the pressure is conducted through the second pressure injection hole to the annular cavity between the second-stage cylinder body and the connecting mandrel and acts on the ratchet piston so that the shear sleeve is pushed by the ratchet piston, and thus the shear sleeve drives the upper cone to move downward.

[0011] Furthermore, a ratchet lock ring is arranged inside the lock ring seat; the ratchet piston moves downward unidirectionally relative to the ratchet lock ring.

[0012] Furthermore, a groove, a convex platform and an inclined platform are arranged inside the lock ring seat; a first retaining ring is placed in the groove of the lock ring seat, a second retaining ring is placed between the convex platform of the lock ring seat and the first retaining ring, and the ratchet lock ring is placed between the inclined platform of the lock ring seat and the second retaining ring.

[0013] Furthermore, a sealing mechanism is further included, and the sealing mechanism includes: a rubber cylinder sleeved on the connecting mandrel; a fixed joint threadedly connected to the connecting mandrel; an upper pressure ring, the upper end of which is threadedly connected to the fixed joint and the lower end of which is fixedly connected to the top of the rubber cylinder; a lower pressure ring, the upper end of which is fixedly connected to the rubber cylinder and the lower end of which is threadedly connected to the first-stage cylinder body; when the first-stage cylinder body moves upward, it pushes the lower pressure ring to extrude the rubber cylinder to expand.

[0014] Furthermore, it also includes an unlocking mechanism, which includes: a limiting groove and an unlocking groove. The limiting groove is opened at the upper end of the central tube, and the unlocking groove is opened at the lower end of the unlocking groove; an upper boss is formed at the upper part of the limiting groove, and a lower boss is formed at the lower part of the limiting groove; a limiting ring is placed in the limiting groove; a sealing boss is arranged on the outer wall of the connecting mandrel; a ratchet claw is threadedly connected to the connecting mandrel, and the lower end of the ratchet claw is elastically expanded by the support of the connecting mandrel and is clamped to the lower cone; a second starting pin is fixedly connected between the lower cone and the central tube; when the central tube moves upward, the second starting pin is disconnected, and at the same time, the central tube drives the upper pressing ring to move upward through the fixed joint, so that the rubber cylinder contracts; when the central tube continues to move upward, it drives the limiting ring and the connecting mandrel to move upward through the lower boss, so that the connecting mandrel drives the ratchet claw to move upward to the unlocking groove. When the ratchet claw moves to the unlocking groove, the ratchet claw elastically contracts into the unlocking groove and disengages from the contact with the lower cone; when the second-stage cylinder body moves relative to the connecting mandrel to the sealing boss, the annular cavity between the second-stage cylinder body and the connecting mandrel is sealed, so that the second-stage cylinder body drives the upper cone to move upward through the ratchet piston, so that the slip body contracts and resets.

[0015] Furthermore, two sets of slotted liquid inlet channels are opened on the central tube. The two sets of slotted liquid inlet channels are vertically distributed, and each set of slotted liquid inlet channels has eight slots. Every eight slots of the slotted liquid inlet channels are circumferentially evenly distributed on the central tube.

[0016] Furthermore, the second-stage cylinder body can move relative to the round piston, and the moving distance is twenty-two millimeters.

[0017] The beneficial effects of the present invention are analyzed as follows:

[0018] A fracturing and production integrated double-cylinder high-temperature and high-pressure packer includes an upper joint, a central tube and a lower joint. The upper joint and the lower joint are respectively threadedly connected to the top and bottom of the central tube;

[0019] An anchoring mechanism is arranged in the middle of the central tube. The anchoring mechanism includes:

[0020] An upper cone, which is slidably connected to the central tube;

[0021] A lower cone, which is fixedly installed on the central tube;

[0022] A slip, which is connected to the central tube and is located between the upper cone and the lower cone;

[0023] Two-way anti-retreat teeth are arranged on the outside of the slip;

[0024] When the upper cone descends, it pushes the slips to expand outwards and anchor on the inner wall of the casing. Thus, the two-way anti-back teeth outside the slips abut against the inner wall of the pipe sleeve, so that the slips are fixed in the vertical direction.

[0025] The tubing is connected to the central pipe through the upper joint and the lower joint. During use, a soluble ball and an inner sliding sleeve are configured and connected to the tubing and then lowered into the well. Subsequently, pressure is applied to the central pipe through the tubing. At this time, pressure is built up inside the tubing. Thus, the anchoring mechanism operates under the action of the pressure. When the anchoring mechanism operates, the upper cone and the lower cone approach each other, so that the slips between the upper cone and the lower cone are squeezed. At this time, the slips expand outwards, so that the expanded slips abut against the inner wall of the casing, making the packer anchored in the casing. The two-way anti-back teeth provided outside the slips enable the slips anchored in the casing to withstand both the upper pressure difference and the lower pressure difference simultaneously, so that it can be applicable to both fracturing and fluid drainage operations. Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the following-described drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure at the rubber cylinder of the present invention;

[0029] Figure 3 For the present invention Figure 2 It is a schematic diagram of the structure of part A in the present invention;

[0030] Figure 4 It is a schematic diagram of the structure at the shear sleeve of the present invention;

[0031] Figure 5 For the present invention Figure 4 It is a schematic diagram of the structure of part B in the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the slip body of the present invention.

[0033] Icon:

[0034] 100. Central tube; 110. Upper joint; 120. Lower joint; 130. Connecting mandrel; 140. Fixed joint; 200. Anchoring mechanism; 210. Upper cone; 220. Lower cone; 230. Slip body; 240. Slip sleeve; 241. Connecting pin; 242. Slip retaining ring; 243. Spring; 300. Dual-fluid cylinder setting mechanism; 310. First-stage cylinder body; 320. Round piston; 321. Lock sleeve; 322. Round lock ring; 330. First pressure injection hole; 340. Second-stage cylinder body; 341. Ratchet piston; 342. Second pressure injection hole; 350. Shearing sleeve; 360. Lock ring seat; 361. First starting pin; 362. Ratchet lock ring; 363. First retaining ring; 364. Second retaining ring; 400. Rubber barrel; 410. Upper pressure ring; 420. Lower pressure ring; 500. Release mechanism; 510. Limiting groove; 511. Upper boss; 512. Lower boss; 520. Limiting ring; 530. Sealing boss; 540. Ratchet claw; 550. Second starting pin; 560. Release groove. Detailed implementation manners

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "central", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] Embodiment

[0039] As Figures 1-6As shown in the figure, a fracturing and fluid production integrated double-cylinder high-temperature and high-pressure packer includes an upper joint 110, a central pipe 100, and a lower joint 120. The upper joint 110 and the lower joint 120 are respectively threadedly connected to the top and bottom of the central pipe 100. Its characteristics are as follows: An anchoring mechanism 200 is provided in the middle of the central pipe 100. The anchoring mechanism 200 includes: an upper cone 210, which is slidably connected to the central pipe 100; a lower cone 220, which is fixedly installed on the central pipe 100; a slip body 230, which is connected to the central pipe 100 and is located between the upper cone 210 and the lower cone 220; a two-way anti-retreat tooth is provided on the outside of the slip body 230; when the upper cone 210 moves downward, it pushes the slip body 230 to expand outward and anchor to the inner wall of the casing, so that the two-way anti-retreat tooth on the outside of the slip body 230 abuts against the inner wall of the pipe sleeve, so that the slip body 230 is fixed in the vertical direction.

[0040] The working mechanism of the fracturing and fluid production integrated double-cylinder high-temperature and high-pressure packer provided in this embodiment is as follows:

[0041] The tubing is connected to the central pipe 100 through the upper joint 110 and the lower joint 120. During use, a soluble ball and an inner sliding sleeve are configured and connected to the tubing and lowered into the well. Subsequently, pressure is applied to the central pipe 100 through the tubing. At this time, the tubing is pressurized, so that the anchoring mechanism 200 operates under the action of the pressure. When the anchoring mechanism 200 operates, the upper cone 210 and the lower cone 220 approach each other, so that the slip body 230 between the upper cone 210 and the lower cone 220 is squeezed. At this time, the slip body 230 expands outward, so that the expanded slip body 230 abuts against the inner wall of the casing, so that the packer is anchored in the casing, and the two-way anti-retreat teeth provided on the outside of the slip body 230 enable the slip body 230 anchored in the casing to withstand both the upper pressure difference and the lower pressure difference at the same time, so that it can be applied to both fracturing and fluid drainage operations at the same time.

[0042] Regarding the anchoring mechanism 200, specifically:

[0043] The anchoring mechanism 200 further includes: a slip sleeve 240, the upper end of which is sleeved on the upper cone 210, and a connecting pin 241 is fixedly connected between the upper cone 210 and the upper cone 210. The lower end is sleeved on the lower cone 220 and threadedly connected with a slip retaining ring 242. When the slip retaining ring 242 is screwed tightly on the slip sleeve 240, the upper end of the slip retaining ring 242 abuts against the outer boss of the lower cone 220; a plurality of springs 243 are annularly distributed inside the slip sleeve 240, and both ends of the spring 243 are respectively connected to the slip sleeve 240 and the slip body 230; a groove matching with the slip body 230 is provided on the slip sleeve 240. When the upper cone 210 moves downward, the connecting pin 241 disconnects, and pushes the slip body 230 to squeeze the spring 243 and expand outward, so that the slip body 230 moves out of the groove of the slip sleeve 240.

[0044] The slips body 230 is split-type. Slots are provided on the slips sleeve 240 for mating with the slips body 230. When the pressure inside the tubing is increased to 18 MPa by pumping, the two slips sleeves 240 support the slips body 230. The slips retaining ring 242 is screwed onto the lower slips sleeve 240 to prevent the lower slips sleeve 240 from falling off. The upper end of the slips retaining ring 242 abuts against the convex platform of the lower cone 220 to ensure that the lower slips sleeve 240 does not move axially. The hoop ring fixes the slips annularly. When the slips are pushed by the upper cone 210 and the lower cone 220, the slips body 230 squeezes the spring 243, causing the spring 243 to contract. When the upper cone 210 and the lower cone 220 move away from the slips body 230, the spring 243 pushes the slips body 230, causing the contraction of the slips body 230 to be released and the anchoring to be released.

[0045] Regarding the double hydraulic cylinder setting mechanism 300, specifically:

[0046] It further includes a double hydraulic cylinder setting mechanism 300. The double hydraulic cylinder setting mechanism 300 includes: a connecting mandrel 130, sleeved on the central tube 100 and having an annular groove on its outer wall; a first-stage hydraulic cylinder body 310, sleeved on the connecting mandrel 130; a round piston 320, sliding in the annular cavity between the first-stage hydraulic cylinder body 310 and the connecting mandrel 130; a lock sleeve 321, threadedly connected to the top of the round piston 320; a round lock ring 322, installed in the annular groove on the outer wall of the connecting mandrel 130 and clamped to the inner wall of the round piston 320. First pressure holes 330 communicating the annular cavity between the first-stage hydraulic cylinder body 310 and the connecting mandrel 130 are provided on the central tube 100 and the connecting mandrel 130. When pressure is applied to the central tube 100, the pressure is conducted through the first pressure holes 330 to the annular cavity between the first-stage hydraulic cylinder body 310 and the connecting mandrel 130 and acts on the round piston 320 to cause the first-stage hydraulic cylinder body 310 to move upward.

[0047] When pressure is applied to the inside of the central tube 100, the pressure is conducted through the first pressure holes 330 into the first-stage hydraulic cylinder body 310. The pressure pushes the round piston 320. The round piston 320 is clamped to the lock sleeve 321 and is clamped to the connecting mandrel 130 through the round lock ring 322. Thus, the round piston 320 does not move relative to the connecting mandrel 130. At this time, the action of the pressure pushes the first-stage hydraulic cylinder body 310 to move upward relative to the connecting mandrel 130.

[0048] In an alternative embodiment of the present example, preferably:

[0049] The double-fluid cylinder setting mechanism 300 further includes: a second-stage cylinder body 340 sleeved on the connecting mandrel 130, and the second-stage cylinder body 340 is threadedly connected to the bottom of the first-stage cylinder body 310; a ratchet piston 341 sliding in the annular cavity between the second-stage cylinder body 340 and the connecting mandrel 130; a shear sleeve 350 sleeved on the connecting mandrel 130, the upper part of the shear sleeve 350 is threadedly connected to the bottom end of the ratchet piston 341, and the lower part of the shear sleeve 350 is threadedly connected to the upper cone 210; a lock ring seat 360 sleeved on the shear sleeve 350, and a first starting pin 361 is fixedly connected between the lock ring seat 360 and the shear sleeve 350; when the first-stage cylinder body 310 moves upward, it drives the second-stage cylinder body 340 to move upward synchronously, thereby shearing the first starting pin 361 to separate the lock ring seat 360 from the shear sleeve 350; a second pressure injection hole 342 communicating with the annular cavity between the second-stage cylinder body 340 and the connecting mandrel 130 is provided on the central tube 100 and the connecting mandrel 130; after the first starting pin 361 is disconnected, continue to inject pressure into the central tube 100, and the pressure is conducted through the second pressure injection hole 342 to the annular cavity between the second-stage cylinder body 340 and the connecting mandrel 130 and acts on the ratchet piston 341 to make the shear sleeve 350 be pushed by the ratchet piston 341, so that the shear sleeve 350 drives the upper cone 210 to move downward.

[0050] When the pressure in the oil pipe reaches 18 MPa, the first starting pin 361 is disconnected. Since the bottom of the first-stage cylinder body 310 is connected to the second-stage cylinder body 340 by thread, when the first-stage cylinder body 310 moves upward, it drives the second-stage cylinder body 340 to move upward synchronously, and the pressure in the central tube 100 is simultaneously conducted through the second pressure injection hole 342 into the second-stage cylinder body 340. At this time, the pressure acts on the ratchet piston 341 in the second-stage cylinder body 340, so that the ratchet piston 341 slides downward relative to the connecting mandrel 130. At this time, the bottom of the ratchet piston 341 pushes the shear sleeve 350 downward, and the shear sleeve 350 drives the upper cone 210 to move downward, so that the upper cone 210 pushes the slip body 230 to expand the slip body 230 outward.

[0051] In an alternative embodiment of the present embodiment, preferably:

[0052] A ratchet lock ring 362 is arranged inside the lock ring seat 360; the ratchet piston 341 moves downward unidirectionally relative to the ratchet lock ring 362.

[0053] The ratchet piston 341 can move downward relative to the ratchet lock ring 362, and the ratchet teeth on the ratchet lock ring 362 and the ratchet piston 341 cooperate with each other so that the ratchet piston 341 cannot move upward relative to the ratchet lock ring 362, so that the upper cone 210 can move downward stably, ensuring the stable expansion of the slip body 230 and enabling the anchoring mechanism 200 to operate stably.

[0054] In an alternative embodiment of the present embodiment, preferably:

[0055] The locking ring seat 360 is internally provided with a groove, a boss and an inclined platform; a first retaining ring 363 is placed in the groove of the locking ring seat 360, a second retaining ring 364 is placed between the boss of the locking ring seat 360 and the first retaining ring 363, and the ratchet locking ring 362 is placed between the inclined platform of the locking ring seat 360 and the second retaining ring 364.

[0056] The ratchet locking ring 362 is squeezed by the inclined platform and the second retaining ring 364 in the locking ring seat 360, so as to prevent the ratchet locking ring 362 from moving relative to the locking ring seat 360, and ensure the stable limit of the ratchet locking ring 362 on the ratchet piston 341.

[0057] Regarding the sealing mechanism, specifically: A sealing mechanism is further included, and the sealing mechanism includes: a rubber cylinder 400 sleeved on the connecting mandrel 130; a fixed joint 140 threadedly connected to the connecting mandrel 130; an upper pressing ring 410, threadedly connected to the fixed joint 140 at the upper end and fixedly connected to the top of the rubber cylinder 400 at the lower end; a lower pressing ring 420, fixedly connected to the rubber cylinder 400 at the upper end and threadedly connected to the first-stage cylinder body 310 at the lower end; when the first-stage cylinder body 310 moves upward, it pushes the lower pressing ring 420 to squeeze the rubber cylinder 400 to expand.

[0058] During the pressure application stage, the fixed joint 140 does not move relative to the connecting mandrel 130, so that the upper pressing ring 410 does not move relative to the fixed joint 140. At this time, the first-stage cylinder body 310 moves upward, so that the first-stage cylinder body 310 drives the lower pressing ring 420 to move upward, so that the lower pressing ring 420 pushes the rubber cylinder 400 to expand, so as to seal between the casing and the packer.

[0059] In an optional manner of this embodiment, preferably:

[0060] The unsealing mechanism 500 is also included, and the unsealing mechanism 500 includes: a limiting groove 510 and an unsealing groove 560, the limiting groove 510 is opened at the upper end of the central tube 100, and the unsealing groove 560 is opened at the lower end of the unsealing groove 560; an upper boss 511 is formed at the upper part of the limiting groove 510, and a lower boss 512 is formed at the lower part of the limiting groove 510; a limiting ring 520 is placed in the limiting groove 510; a sealing boss 530 is arranged on the outer wall of the connecting core shaft 130; a ratchet pawl 540 is threadedly connected to the connecting core shaft 130, and the lower end of the ratchet pawl 540 is supported by the connecting core shaft 130 to elastically expand and be clamped to the lower cone 220; a second starting pin 550 is fixedly connected between the lower cone 220 and the central tube 100; when the central tube 100 goes up, the second starting pin 550 is disconnected At the same time, the center tube 100 drives the upper pressure ring 410 to move upward through the fixed joint 140, so that the rubber cylinder 400 contracts; when the center tube 100 continues to move upward, it drives the limit ring 520 and the connecting core shaft 130 to move upward through the lower boss 512, so that the connecting core shaft 130 drives the ratchet claw 540 to move upward to the unsealing groove 560. When the ratchet claw 540 moves to the unsealing groove 560, the ratchet claw 540 elastically contracts into the unsealing groove 560 and breaks away from the contact with the lower cone 220; when the second-stage liquid cylinder body 340 moves to the sealing boss 530 relative to the connecting core shaft 130, the annular cavity between the second-stage liquid cylinder body 340 and the connecting core shaft 130 is sealed, so that the second-stage liquid cylinder body 340 drives the upper cone 210 upward through the ratchet piston 341, so that the slip body 230 contracts and resets.

[0061] When unsealing, the oil pipe is lifted up, and the oil pipe drives the upper joint 110, and then drives the center pipe 100. Since the slip body 230 is anchored in the casing, the center pipe 100 and the lower cone 220 will move relative to each other. At this time, the second starting pin 550 is cut off, and the pipe string continues to be lifted up, the center pipe 100 moves upward, and the limiting ring 520 moves downward relative to the fixed joint 140 and moves to the lower boss 512, that is, at this time, the upper pressure ring 410 moves upward relative to the lower pressure ring 420, so that the rubber cylinder 400 is recovered, and further, the limiting ring 520 is stuck at the lower boss 512, and the center pipe 100 drives the connecting core shaft 130 to move upward through the limiting ring 520, so that the ratchet claw 540 moves upward, and when the ratchet claw 540 moves into the unsealing groove 560, the ratchet claw 540 is released. The second stage cylinder 340 is elastic and contracts, so that the bottom of the ratchet claw 540 is away from the lower cone 220, and the pipe column is continuously lifted to drive the second stage liquid cylinder 340 to move to the sealing boss 530. At this time, the second punching hole 342 is not connected with the annular cavity between the second stage liquid cylinder 340 and the connecting core shaft 130, so that under the action of negative pressure, the second stage liquid cylinder 340 drives the ratchet piston 341 and the upper cone 210 upward, and the upper cone 210 and the upper cava sleeve 240 complete the positioning, and then the upper cone 210 drives the upper cava sleeve 240 upward, and the lower cava sleeve 240 and the lower cone 220 complete the positioning. At this time, the upper cone 210 and the lower cone 220 are away from each other, so that the cava body 230 is pressed back into the cava sleeve 240 under the elastic force of the spring 243 to complete the unsealing.

[0062] Among the optional methods of this embodiment, the more preferred ones are:

[0063] Two groups of slit liquid inlet channels are provided on the central tube 100 . The two groups of slit liquid inlet channels are vertically distributed, and each group of slit liquid inlet channels has eight slits. Each group of eight slit liquid inlet channels is evenly distributed on the central tube 100 in a circular shape.

[0064] The slit liquid inlet channel opened on the central pipe 100 allows fracturing fluid to be injected into the slit, expanding the slit and forming a liquid channel, which increases the permeability of oil and gas and improves the oil and gas production.

[0065] Among the optional methods of this embodiment, the more preferred ones are:

[0066] The second-stage cylinder body 340 can move relative to the round piston 320, and the moving distance is 22 mm.

[0067] There is a certain moving distance between the second-stage liquid cylinder body 340 and the round piston 320, which is 22 mm, to meet the requirement of 18 mm compression distance of the rubber cylinder 400 under the compression force of 15 tons.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A fracturing and production integrated double-cylinder high-temperature and high-pressure packer, comprising an upper joint (110), a central tube (100) and a lower joint (120), wherein the upper joint (110) and the lower joint (120) are respectively threadedly connected to the top and bottom of the central tube (100). It is characterized in that; An anchoring mechanism (200) is provided in the middle of the central tube (100), and the anchoring mechanism (200) includes: An upper cone (210), slidably connected to the central tube (100); A lower cone (220), fixedly installed on the central tube (100); A slip body (230), connected to the central tube (100) and located between the upper cone (210) and the lower cone (220); Two-way anti-retreat teeth are provided on the outer part of the slip body (230); When the upper cone (210) moves downward, it pushes the slip body (230) to expand outward and anchor to the inner wall of the casing, so that the two-way anti-retreat teeth on the outer part of the slip body (230) abut against the inner wall of the casing tube, so that the slip body (230) is fixed in the vertical direction.

2. The fracturing and production integrated double-cylinder high-temperature and high-pressure packer according to claim 1, It is characterized in that; The anchoring mechanism (200) further includes: A slip sleeve (240), the upper end of which is sleeved on the upper cone (210), and a connecting pin (241) is fixedly connected between the upper cone (210) and the lower end, which is sleeved on the lower cone (220) and threadedly connected with a slip retaining ring (242). When the slip retaining ring (242) is tightened on the slip sleeve (240), the upper end of the slip retaining ring (242) abuts against the outer convex platform of the lower cone (220); A plurality of springs (243), annularly distributed inside the slip sleeve (240), and both ends of the spring (243) are respectively connected to the slip sleeve (240) and the slip body (230); A groove cooperating with the slip body (230) is provided on the slip sleeve (240). When the upper cone (210) moves downward, the connecting pin (241) disconnects and pushes the slip body (230) to squeeze the spring (243) and expand outward, so that the slip body (230) moves out of the groove of the slip sleeve (240).

3. The fracturing and production integrated double-cylinder high-temperature and high-pressure packer according to claim 2, characterized in that ； It further includes a double-cylinder setting mechanism (300), and the double-cylinder setting mechanism (300) includes: A connecting mandrel (130), sleeved on the central tube (100), and an annular groove is provided on the outer wall; A first-stage cylinder body (310), sleeved on the connecting mandrel (130); A round piston (320), sliding in the annular cavity between the first-stage cylinder body (310) and the connecting mandrel (130); A lock sleeve (321), threadedly connected to the top of the round piston (320); A round lock ring (322), installed in the annular groove on the outer wall of the connecting mandrel (130) and clamped to the inner wall of the round piston (320); A first pressure injection hole (330) communicating the annular cavity between the first-stage cylinder body (310) and the connecting mandrel (130) is provided on the central tube (100) and the connecting mandrel (130). When pressurizing the central tube (100), the pressure is conducted through the first pressure injection hole (330) to the annular cavity between the first-stage cylinder body (310) and the connecting mandrel (130) and acts on the round piston (320) to move the first-stage cylinder body (310) upward.

4. The fracturing and production integrated double-cylinder high temperature and high pressure packer according to claim 3, characterized in that ； The double-fluid cylinder setting mechanism (300) further includes: A second-stage cylinder body (340) sleeved on the connecting mandrel (130), and the second-stage cylinder body (340) is threadedly connected to the bottom of the first-stage cylinder body (310); A ratchet piston (341) sliding in the annular cavity between the second-stage cylinder body (340) and the connecting mandrel (130); A shear sleeve (350) sleeved on the connecting mandrel (130), the upper part of the shear sleeve (350) is threadedly connected to the bottom end of the ratchet piston (341), and the lower part of the shear sleeve (350) is threadedly connected to the upper cone (210); A lock ring seat (360) sleeved on the shear sleeve (350), and a first starting pin (361) is fixedly connected between the lock ring seat (360) and the shear sleeve (350); When the first-stage cylinder body (310) moves upward, it drives the second-stage cylinder body (340) to move upward synchronously, thereby shearing the first starting pin (361) so that the lock ring seat (360) is separated from the shear sleeve (350); A second pressure hole (342) communicating with the annular cavity between the second-stage cylinder body (340) and the connecting mandrel (130) is provided on the central tube (100) and the connecting mandrel (130); After the first starting pin (361) is disconnected, continue to apply pressure into the central tube (100), and the pressure is conducted through the second pressure hole (342) to the annular cavity between the second-stage cylinder body (340) and the connecting mandrel (130) and acts on the ratchet piston (341) so that the shear sleeve (350) is pushed by the ratchet piston (341), thereby the shear sleeve (350) drives the upper cone (210) to move downward.

5. The fracturing and production integrated double-cylinder high-temperature and high-pressure packer according to claim 4, It is characterized in that; A ratchet lock ring (362) is arranged inside the lock ring seat (360); The ratchet piston (341) moves downward unidirectionally relative to the ratchet lock ring (362).

6. The fracturing and production integrated double-cylinder high-temperature and high-pressure packer according to claim 5, It is characterized in that; The lock ring seat (360) is internally provided with a groove, a convex platform and an inclined platform; A first retaining ring (363) is placed in the groove of the lock ring seat (360), a second retaining ring (364) is placed between the convex platform of the lock ring seat (360) and the first retaining ring (363), and the ratchet lock ring (362) is placed between the inclined platform of the lock ring seat (360) and the second retaining ring (364).

7. The fracturing and production integrated double-cylinder high-temperature and high-pressure packer according to claim 6, characterized in that ； It further includes a sealing mechanism, and the sealing mechanism includes: A rubber cylinder (400) sleeved on the connecting mandrel (130); A fixed joint (140) threadedly connected to the connecting mandrel (130); An upper pressure ring (410) is threadedly connected to the fixed joint (140) at the upper end and fixedly connected to the top of the rubber cylinder (400) at the lower end; A lower pressure ring (420) is fixedly connected to the rubber cylinder (400) at the upper end and threadedly connected to the first-stage cylinder body (310) at the lower end; When the first-stage cylinder body (310) moves upward, it pushes the lower pressure ring (420) to squeeze the rubber cylinder (400) to expand.

8. The fracturing and production integrated double-cylinder high temperature and high pressure packer according to claim 7, characterized in that ； The device further comprises an unsealing mechanism (500), wherein the unsealing mechanism (500) comprises: A limiting groove (510) and an unsealing groove (560), wherein the limiting groove (510) is provided at the upper end of the central tube (100), and the unsealing groove (560) is provided at the lower end of the unsealing groove (560); The upper portion of the limiting groove (510) forms an upper boss (511), and the lower portion of the limiting groove (510) forms a lower boss (512); A limiting ring (520) is placed in the limiting groove (510); A sealing boss (530) is arranged on the outer wall of the connecting core shaft (130); A ratchet pawl (540) is threadedly connected to the connecting core shaft (130), and the lower end of the ratchet pawl (540) is supported by the connecting core shaft (130) to elastically expand and be clamped to the lower cone (220); A second starting pin (550) is fixedly connected between the lower cone (220) and the central tube (100); When the central tube (100) moves upward, the second starting pin (550) is disconnected, and at the same time, the central tube (100) drives the upper pressure ring (410) to move upward through the fixed joint (140), so that the rubber cylinder (400) contracts; When the central tube (100) continues to move upward, the limiting ring (520) and the connecting core shaft (130) are driven upward through the lower boss (512), so that the connecting core shaft (130) drives the ratchet claw (540) to move upward to the unsealing groove (560). When the ratchet claw (540) moves to the unsealing groove (560), the ratchet claw (540) elastically contracts into the unsealing groove (560) and breaks away from contact with the lower cone (220); When the second-stage liquid cylinder body (340) moves relative to the connecting core shaft (130) to the sealing boss (530), the annular cavity between the second-stage liquid cylinder body (340) and the connecting core shaft (130) is sealed, so that the second-stage liquid cylinder body (340) drives the upper cone (210) upward through the ratchet piston (341), so that the cava body (230) contracts and resets.

9. The fracturing and production integrated double-cylinder high-temperature and high-pressure packer according to claim 1, It is characterized by: The central tube (100) is provided with two groups of slit liquid inlet channels, the two groups of slit liquid inlet channels are vertically distributed, and each group of slit liquid inlet channels has eight slits, and each group of eight slit liquid inlet channels is evenly distributed on the central tube (100) in a circular shape.

10. The fracturing and production integrated double-cylinder high-temperature and high-pressure packer according to claim 4, characterized in that ； The second-stage liquid cylinder (340) can move relative to the round piston (320), and the moving distance is 22 millimeters.

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