Circulating squeezing bridge plug

Abstract

The invention relates to a recyclable squeezing bridge plug which comprises a central pipe, a lower connector, a first connecting sleeve and a lock cap which are connected in sequence. The rotary joint, the coupling, the oil pipe and the round head guide shoe are connected in sequence; the sliding valve, the ball seat, the lining, the blocking ball capable of being fixed to the ball seat and the setting assembly arranged on the central pipe are arranged on the base; the slide valve is provided with a first channel, and the side wall of the lower joint is provided with a second channel which can be communicated with the first channel; the lining is connected with the ball seat through a rivet, a third channel is arranged on the side wall of the lining, a fourth channel is arranged on the side wall of the ball seat, and when the rivet is not broken, the third channel is communicated with the fourth channel. According to the scheme, after the cement paste is directly injected into the bottom of the well body through the third channel and the fourth channel, the cement paste circulates upwards, the problem that cement escapes outwards along a well body leakage layer when the well is sealed by cement is avoided, the cement paste can fully fill a target area of the well body, and the conditions that the stratum is blocked and the permeability is too high are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling well sealing, and more particularly to a recyclable squeeze bridge plug. BACKGROUND

[0002] With the development of the oil and gas industry, many oil and water wells will have problems such as downhole casing damage, casing outer layer interconnection, and production layer depletion when they enter the middle and late stages of production. To solve these problems, cement squeezing and other operations are usually required to repair the well structure, plug the channeling layer, and seal the well. The traditional squeezing process and tools have problems such as low efficiency, high cost, and poor reliability when facing these complex situations.

[0003] Especially in the aspect of old well repair and well sealing, especially for lost circulation wells with complex well conditions, when the formation loss is serious, the traditional squeezing process and tools are prone to formation plugging, excessive permeability, and other situations, causing the cement for filling and sealing to escape along the lost circulation layer and not enter the well bottom, thereby causing the cement slurry for squeezing the formation to not fully fill the target area, the cementing quality cannot meet the design requirements, and there are defects such as unstable wellbore pressure and high risk during operation. SUMMARY

[0004] The purpose of the present application is to overcome the deficiencies in the prior art that the formation loss is serious and the formation plugging causes the cement slurry to not fully fill the target area during well sealing repair, and to provide a recyclable squeeze bridge plug. The present application can solve the problem that the cement slurry cannot fully fill the target area caused by serious formation loss and formation plugging, and can keep the pressure in the wellbore stable during operation, reducing the risk of operation.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is as follows: A recyclable squeeze bridge plug is provided, which comprises a central pipe, a lower joint, a first connecting sleeve and a lock cap connected in sequence; a rotating joint, a coupling, a tubing and a round head guide shoe connected in sequence; a slide valve, a ball seat, a bushing, a blocking ball fixed to the ball seat and a setting assembly provided on the central pipe; The rotating joint is rotatably connected with the lock cap; the slide valve extends into the inner cavities of the central pipe and the lower joint at both ends, and the slide valve can slide along the central pipe, a first channel is provided on the slide valve, and a second channel that can communicate with the first channel is provided on the side wall of the lower joint; a fixing groove is formed between the lower joint and the first connecting sleeve, one end of the bushing is fixed to the inner cavity of the lower joint, and the other end extends into the inner cavity of the first connecting sleeve; Two ends of the ball seat respectively extend into the inner cavities of the lower joint and the bushing, the bushing and the ball seat are connected by a rivet, a third channel is arranged on the sidewall of the bushing, a fourth channel is arranged on the sidewall of the ball seat, and the third channel and the fourth channel are in communication when the rivet is not broken.

[0006] In the scheme, the central tube, the lower joint, the first connecting sleeve and the lock cap are sequentially threadedly connected, and the rotary joint, the coupling, the oil pipe and the round head guide shoe are also sequentially threadedly connected. The inner cavity bottom of the lower joint is provided with a limiting step surface, and a fixed groove is formed between the lower joint and the first connecting sleeve after the lower joint and the first connecting sleeve are threadedly connected, wherein the limiting step surface of the lower joint and the end surface of the first connecting sleeve form two sidewalls of the fixed groove, the top of the bushing is provided with a stepped protrusion, and the stepped protrusion is clamped into the fixed groove to complete the fixation of the bushing in the inner cavity of the lower joint. The rotary joint is rotationally connected with the lock cap, that is, the rotary joint can rotate in the inner cavity of the lock cap after extending into the inner cavity of the lock cap.

[0007] The ball seat can slide in the slide valve and the bushing, and after the squeeze bridge plug extends into the inner cavity of the well body, the first channel and the second channel are located above the lost circulation layer of the well body, and the third channel and the fourth channel are located below the lost circulation layer of the well body. Before the plug ball is put in, the ball seat is fixed on the bushing through the rivet, at this time, the third channel and the fourth channel are in communication, the end of the ball seat extending into the slide valve blocks the first channel, so that the cement slurry entering the inner cavity of the slide valve cannot flow out along the first channel and the second channel. After the plug ball is put in, the plug ball blocks the third channel and the fourth channel, and when the cement slurry continues to be injected, the rivet is subjected to a larger shearing force until the rivet is broken, after the rivet is broken, the ball seat slides downward in the bushing and the slide valve, so that the ball seat cannot block the first channel and the second channel, and because the third channel and the fourth channel are blocked, the cement slurry entering the slide valve flows out along the first channel and the second channel.

[0008] The squeeze bridge plug of the present application, when working, first selects a suitable length of tubing according to the depth of the well to be set, so that after the squeeze bridge plug is extended into the well cavity, the tubing can drive the bullet shoe to cross the part of the formation loss in the well and extend to the bottom of the well, and calculate the first cement filling amount required for the part below the loss layer and the second cement filling amount required for the part above the loss layer when using cement slurry to plug the well according to the well data to be set. Then connect the mechanical setting tool with the central tube, and inject cement slurry into the central tube cavity through the mechanical setting tool. The cement slurry flows down into the ball seat after being injected into the central tube, and the cement slurry entering the ball seat passes through the fourth channel and the third channel into the inner cavity of the first connecting sleeve. The cement slurry entering the inner cavity of the first connecting sleeve continues to move downward along the first connecting sleeve and sequentially passes through the rotary joint, the coupling tubing and the bullet shoe, and then is injected into the bottom of the well along the bullet shoe. As the cement slurry injected into the well increases, the cement slurry circulating into the well cavity makes the cement slurry level in the well cavity also rise, until the cement slurry injected into the well reaches the first cement filling amount, at which time the part below the loss layer in the well has completed cement sealing, and the cement slurry moving from bottom to top has partially filled the loss layer, and further injection of cement from top to bottom can further prevent cement from escaping along the loss layer.

[0009] After the part below the loss layer in the well completes cement sealing, the blocking ball is put into the central tube, and the blocking ball blocks the third channel and the fourth channel after being put into the central tube, so that the circulating channel of the squeeze bridge plug to the bottom of the well is closed.

[0010] After the circulating channel is closed, the mechanical setting tool is used to set the setting assembly on the central tube. After the well setting is completed, the cement slurry continues to be injected into the squeeze bridge plug. After the cement slurry continues to be injected, the blocking ball blocks the downward path of the cement, so that the downward force on the ball seat will be transmitted to the rivet as a shear force when the cement continues to be injected, and the shear force on the rivet becomes larger until the rivet breaks. After the rivet breaks, the ball seat slides downward in the bushing and the slide valve so that the ball seat cannot block the first channel and the second channel, and because the third channel and the fourth channel are blocked, the cement entering the slide valve flows out along the first channel and the second channel. The cement flowing out along the first channel and the second channel performs cement squeeze on the bottom layer, until the second cement filling amount is reached, and then the slide valve is lifted in the central tube through the mechanical setting tool, so that the first channel and the second channel are misaligned, and the squeeze channel is closed.

[0011] The recyclable squeeze bridge plug of the present application can directly inject cement slurry to the bottom of the well body through the third channel and the fourth channel, and the cement slurry is circulated upward, which can avoid the problem that the cement escapes outward along the leakage layer of the well body when the well is sealed by the cement, so that the cement slurry can fully fill the target area of the well body, and the situation that the formation is blocked and the permeability is too high can be avoided when the well is sealed, so that the cementing quality can meet the design requirements.

[0012] Further, the setting assembly comprises an upper slip protector, an upper slip, an upper cone, an upper outer ring, an upper inner ring, an upper rubber, a middle rubber, a lower rubber, a lower inner ring, a lower outer ring, a lower cone and a lower slip arranged in sequence on the release ring installed at the top of the inner cavity of the central pipe, and the lower slip is connected with the lower joint; The inner cavity of the upper slip protector is provided with a lock ring for preventing the upper slip protector from sliding in the direction of the upper slip; and the inner cavity of the upper slip is provided with a first clasp ring for preventing the upper slip from sliding in the direction of the upper slip protector; The upper cone, the upper outer ring and the upper inner ring are fixedly connected in sequence; and the lower cone, the lower outer ring and the lower inner ring are fixedly connected in sequence. The upper cone, the upper outer ring and the upper inner ring are connected through a fixed pin, and the lower cone, the lower outer ring and the lower inner ring are also connected through a fixed pin, so that the relative rotation between the cone, the outer ring and the inner ring can be prevented.

[0013] When the setting assembly is set, the upper slip protector moves downward to press the upper slip, the upper slip is expanded along the upper cone to abut against the sidewall of the sleeve in the well body, and the riveting of the upper slip on the sleeve in the well body is completed. Then the central pipe is pulled up, the lower slip moves upward to expand along the lower cone to abut against the sidewall of the sleeve in the well body, and the setting of the well body is completed. In the process of upward movement of the lower slip, the upper rubber, the middle rubber and the lower rubber are pressed to deform the rubber in the rubber to tightly adhere to the sleeve in the well body, and the well body is sealed. The setting of the upper outer ring and the lower outer ring can avoid the flow rate of the rubber in the rubber, and the sealing capacity of the rubber is improved.

[0014] Further, the setting assembly further comprises a setting joint package for driving the setting assembly to set the well body by a mechanical setting tool, and the setting joint package comprises a push cylinder, a second connecting sleeve, a fixing sleeve, a pull rod, a valve body push rod, a shear pin and a torque transmission sleeve; The push cylinder is connected with the outer pipe of the mechanical setting tool; the second connecting sleeve is located in the inner cavity of the push cylinder and is connected with the inner pipe of the mechanical setting tool; and the torque transmission sleeve is inserted into the central pipe to transmit torque; The pull rod is in threaded connection with the fixing sleeve, and the pull rod and the fixing sleeve form a groove capable of accommodating the bottom of the second connecting sleeve after being connected.

[0015] The shear pin passes through the torque transmission sleeve and the pull rod, and the ball is located between the second connecting sleeve and the fixing sleeve.

[0016] The inner tube and the outer tube of the mechanical setting tool are connected in a threaded connection mode, that is, when the inner tube of the mechanical setting tool is rotated, if the outer tube of the mechanical setting tool cannot be rotated, the outer tube of the mechanical setting tool will slide along the axial direction. After the setting adapter is connected with the squeeze bridge plug, the push cylinder is sleeved on the outer sidewall of the central tube, and the push cylinder can push the upper slip protector, thereby pushing the upper slip to be expanded along the upper cone, and the riveting of the upper slip is completed. The outer sidewall top end of the central tube is provided with a key groove, and when the setting adapter is connected with the squeeze bridge plug, the torque transmission sleeve can be inserted into the key groove at the top of the outer sidewall of the central tube to transmit torque.

[0017] The bottom of the second connecting sleeve is provided with an outward protruding protrusion, and the protrusion can be clamped into the groove; the top of the valve push rod is also provided with an outward protruding protrusion, the protrusion of the valve push rod extends into the inner cavity of the protrusion of the second connecting sleeve and is attached to each other, the outer sidewall of the protrusion of the second connecting sleeve is attached to the bottom surface of the groove, and the bottom surface of the protrusion of the valve push rod can abut against the lower end surface of the groove. The second connecting sleeve shell rotates in the groove, but when the downward pressure on the valve push rod is too large, the valve push rod will drive the pull rod to be pressed downward, and the pull rod will drive the fixing sleeve to be pressed downward. After the fixing sleeve is pressed downward on the second connecting sleeve, the second connecting sleeve and the fixing sleeve can be driven to rotate together due to the friction therebetween, the fixing sleeve drives the pull rod to rotate, the pull rod drives the torque transmission sleeve to rotate, and the torque transmission sleeve drives the central tube to rotate.

[0018] The mechanical setting tool, the setting joint package and the bridge plug are connected, and then the setting assembly is set. At this time, the inner tube of the mechanical setting tool rotates upward to drive the second connecting sleeve to rotate upward. The second connecting sleeve rotates upward to drive the transmission sleeve to rotate upward through the fixed sleeve and the pull rod. The transmission sleeve rotates upward to drive the central tube to rotate upward. However, at this time, the outer tube of the mechanical setting tool does not move, that is, the push cylinder does not move. When the central tube drives the setting assembly to move upward, the push cylinder pushes the upper slip protection sleeve, and then pushes the upper slip to be expanded along the upper taper. The riveting of the upper slip is completed. The upper slip is pulled upward to rivet the lower slip, and then the well body is set. When the well body is set, the release ring is broken. After the well body is set, the mechanical setting tool and the setting joint package are pulled out, and the second cement injection is performed. After the cement injection is completed, the setting joint package is connected with the central tube again. At this time, the pull rod is pulled upward to drive the slide valve to move upward and block the cement passage.

[0019] When the setting joint package is inserted again, if the transmission sleeve is not successfully inserted into the key groove of the central tube, the shear pin between the transmission sleeve and the pull rod is broken under stress when the pull rod is continuously pressed downward, so that the pull rod can continue to move downward to be engaged with the slide valve.

[0020] The setting of the ball can further reduce the friction between the second connecting sleeve and the fixed sleeve, and avoid mechanical wear when the second connecting sleeve drives the fixed sleeve to rotate.

[0021] Further, the outer side wall of the upper slip and the lower slip is sleeved with a hoop ring to prevent the slips from scattering. The setting of the hoop ring can make the slips expand uniformly along the inclined surface of the taper, and avoid the scattering of the slips.

[0022] Further, an end of the slide valve extending into the central tube is provided with an elastic claw. Adjacent two claw teeth of the elastic claw are provided with a deformation groove for deformation of the claw teeth. The end of the claw tooth is provided with a clamping protrusion. The inner side wall of the central tube is provided with a clamping groove capable of being clamped with the clamping protrusion. The slide valve can slide to the state that the clamping protrusion extends into the clamping groove. When the clamping protrusion is not clamped with the clamping groove, the side wall of the clamping protrusion is attached to the inner side wall of the central tube, that is, the claw teeth of the elastic claw slightly close to the axis of the central tube. When the slide valve slides upward to align the clamping protrusion with the clamping groove, the claw teeth expand outward under the action of the elastic force of the claw teeth to clamp the clamping protrusion into the clamping groove, and the fixing of the slide valve in the central tube is completed. When the slide valve is fixed in the central tube, the first passage and the second passage are staggered. The inner cavity of the claw tooth of the elastic claw is provided with a protrusion, and the side wall of the valve body push rod is provided with a groove for clamping the protrusion. When the slide valve needs to be lifted, the setting joint package is inserted into the central tube to make the protrusion clamped with the groove. At this time, the slide valve can be lifted by the setting joint package.

[0023] Further, the side wall of the center tube is fixedly provided with a guide pin, the slide valve is provided with a guide groove, and one end of the guide pin extends into the guide groove through the side wall of the center tube and is in sliding connection with the guide groove. The arrangement of the guide pin can avoid the rotation of the slide valve in the center tube.

[0024] Further, the bushing is provided with a clamping groove at the bottom of the inner side wall, the side wall of the ball seat is provided with a second clamping ring, when the rivet is broken, the ball seat can slide to the direction of the round head guide shoe to the clamping of the second clamping ring and the clamping groove. The fourth channel on the ball seat is located at the bottom of the side wall of the ball seat, and the middle part of the inner cavity of the ball seat is provided with a step surface for preventing the blocking ball from falling further. The part of the step surface in contact with the blocking ball is an arc surface that can fit the blocking ball. The top of the ball seat is provided with a guide slope for the blocking ball to smoothly enter the inner cavity of the ball seat. The second clamping ring is a C ring. When the ball seat does not slide, the second clamping ring is tightly fitted with the inner side wall of the bushing. When the ball seat slides downward to the position where the second clamping ring is opposite to the clamping groove, the second clamping ring is popped out to the clamping groove, thereby fixing the ball seat in the bushing.

[0025] Further, after the first connecting sleeve is connected with the lock cap, a positioning groove is formed between the first connecting sleeve and the lock cap, one end of the rotary joint extending into the inner cavity of the lock cap is provided with a positioning protrusion located in the positioning groove, and the positioning protrusion is in rotational connection with the positioning groove. The first connecting sleeve and the lock cap are connected with the rotary joint provided with the positioning protrusion through the positioning groove, thereby realizing the rotational connection of the rotary joint and the lock cap.

[0026] Further, a bearing is also installed in the positioning groove, and the two ends of the bearing are respectively in abutment with the positioning groove and the positioning protrusion. In the vertical direction, the two end faces of the bearing are respectively in abutment with the bottom face of the positioning protrusion and the bottom face of the positioning groove. The arrangement of the bearing can reduce the friction between the positioning protrusion and the positioning groove during rotation, so that the resistance of the rotary joint during rotation is smaller.

[0027] Further, in the scheme, a sealing part is arranged between two adjacent or sleeved components, the sealing part is a sealing ring or a sealing ring provided with sealing back rings on both sides, and the sealing back rings can provide support for the sealing ring, so that the sealing performance of the sealing ring is better.

[0028] Compared with the prior art, the beneficial effects of the present application are: The circulating squeeze bridge plug of the present application can directly inject cement slurry into the bottom of the well body through the third channel and the fourth channel, the cement slurry circulates upward, the problem that cement escapes outward along the lost circulation zone of the well body during cementing is avoided, the cement slurry can fully fill the target area of the well body, the problems of formation plugging and excessively high permeability during cementing are avoided, and the cementing quality can meet the design requirements.

[0029] The present invention provides a recyclable injection bridge plug that reduces the large torque required during rotation by setting a setting joint package, thereby protecting the tubing, tools, and operational safety. It also solves the problem of the torque generated during rotation being transmitted to the central tube of the injection bridge plug through the torque transmission sleeve, better protecting the release ring and preventing the release ring from breaking due to excessive torque, which would cause the injection bridge plug to set in failure. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a recyclable injection bridge plug; Figure 2 for Figure 1 Enlarged view of part A; Figure 3 for Figure 1 Enlarged view of part B; Figure 4 A schematic diagram of the setting assembly of a recyclable extrusion bridge plug; Figure 5 A schematic diagram of the setting connector package for a recyclable extrusion bridge plug; Figure 6 A schematic diagram of the structure of a slide valve for a recyclable injection bridge plug; Figure 7 This is a schematic diagram of the working state of a recyclable injection bridge plug during the circulation of cement slurry before setting. The arrows in the diagram indicate the flow direction of the cement slurry. Figure 8 This is a schematic diagram of the working state of a recyclable injection bridge plug during ball throwing. The arrow in the diagram indicates the flow direction of the cement slurry. Figure 9 This is a schematic diagram of the working state of a recyclable injection bridge plug after setting and injecting cement. The arrows in the diagram indicate the flow direction of the cement slurry. Figure 10 This is a schematic diagram of the working state of a recyclable injection bridge plug when the injection channel is closed. The arrows in the diagram indicate the flow direction of the cement slurry.

[0031] In the drawings: 1, central tube; 2, lower joint; 3, first connecting sleeve; 4, locking cap; 5, rotary joint; 6, coupling; 7, oil pipe; 8, round head guide shoe; 9, sliding valve; 10, ball seat; 11, bushing; 12, blocking ball; 13, setting assembly; 901, first channel; 201, second channel; 1101, third channel; 1001, fourth channel; 14, rivet; 1301, upper slip protection sleeve; 1302, upper slip; 1303, upper cone; 1304, upper outer ring; 1305, upper inner ring; 1306, upper side rubber cylinder; 1307, middle rubber cylinder; 1308, lower side rubber cylinder; 1309, lower inner ring; 1310, lower outer ring; 1311, lower cone; 1312, lower slip; 1313, locking ring; 1314, first snap ring; 1316, release ring; 15, setting joint package; 1501, push cylinder; 1502, second connecting sleeve; 1503, fixed sleeve; 1504, pull rod; 1505, valve body push rod; 1506, shear pin; 1507, torque transmission sleeve; 1508, ball; 1315, hoop ring; 902, elastic claw; 921, deformation groove; 922, claw tooth; 923, clamping protrusion; 101, clamping groove; 102, guide pin; 1102, clamping groove; 1002, second snap ring; 16, bearing; 17, sealing part; 18, mechanical setting tool. DETAILED DESCRIPTION

[0032] The application will be further described below in connection with specific embodiments. In the drawings, only for exemplary illustration, the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation on the patent; in order to better illustrate the embodiments of the application, some components of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some known structures and their descriptions in the drawings may be omitted.

[0033] The same or similar reference numerals in the drawings of the embodiments of the application correspond to the same or similar components; in the description of the application, it should be understood that if the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the application and simplifying the description, and therefore the terms describing the positional relationship in the drawings cannot be understood as a limitation on the patent, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] Embodiment one This embodiment is a first embodiment of a recyclable squeeze bridge plug, as shown in Figure 1-10As shown, it comprises a central pipe 1, a lower joint 2, a first connecting sleeve 3 and a lock cap 4 connected in sequence; a rotary joint 5, a coupling 6, a tubing 7 and a round head guide shoe 8 connected in sequence; and a sliding valve 9, a ball seat 10, a bushing 11, a blocking ball 12 fixable to the ball seat 10 and a setting assembly 13 arranged on the central pipe 1; The rotary joint 5 is rotationally connected with the lock cap 4; the sliding valve 9 extends into the inner cavities of the central pipe 1 and the lower joint 2 respectively and is slidable along the central pipe 1, and the sliding valve 9 is provided with a first channel 901, and the sidewall of the lower joint 2 is provided with a second channel 201 in communication with the first channel 901; a fixing groove is formed between the lower joint 2 and the first connecting sleeve 3, and the bushing 11 is fixed at one end to the inner cavity of the lower joint 2 and extends into the inner cavity of the first connecting sleeve 3 at the other end; The ball seat 10 extends into the inner cavities of the lower joint 2 and the bushing 11 respectively, and the bushing 11 and the ball seat 10 are connected by a rivet 14, the sidewall of the bushing 11 is provided with a third channel 1101, and the sidewall of the ball seat 10 is provided with a fourth channel 1001, and when the rivet 14 is not broken, the third channel 1101 is in communication with the fourth channel 1001.

[0035] Specifically, the central pipe 1, the lower joint 2, the first connecting sleeve 3 and the lock cap 4 are threadedly connected in sequence, and the rotary joint 5, the coupling 6, the tubing 7 and the round head guide shoe 8 are also threadedly connected in sequence. The inner cavity of the lower joint 2 is provided with a limiting step surface at the bottom, and after the lower joint 2 and the first connecting sleeve 3 are threadedly connected, a fixing groove is formed between the lower joint 2 and the first connecting sleeve 3, wherein the limiting step surface of the lower joint 2 and the end surface of the first connecting sleeve 3 form two sidewalls of the fixing groove, and the top of the bushing 11 is provided with a step-shaped protrusion which is clamped into the fixing groove to complete the fixation of the bushing 11 in the inner cavity of the lower joint 2. The rotary joint 5 is rotationally connected with the lock cap 4, that is, the rotary joint 5 can rotate in the inner cavity of the lock cap 4 after extending into the inner cavity of the lock cap 4.

[0036] The ball seat 10 can slide in the sliding valve 9 and the bushing 11. After the squeeze bridge plug is extended into the inner cavity of the well body, the first channel 901 and the second channel 201 are located above the lost circulation layer of the well body, and the third channel 1101 and the fourth channel 1001 are located below the lost circulation layer of the well body. Before the blocking ball 12 is put in, the ball seat 10 is fixed on the bushing 11 by the rivet 14, at this time, the third channel 1101 and the fourth channel 1001 are communicated, the ball seat 10 is extended into one end of the sliding valve 9 to block the first channel 901, so that the cement slurry entering the inner cavity of the sliding valve 9 cannot flow out along the first channel 901 and the second channel 201. After the blocking ball 12 is put in, the blocking ball 12 blocks the third channel 1101 and the fourth channel 1001. When the cement slurry continues to be injected, the rivet 14 is subjected to a larger shear force until the rivet 14 is broken. After the rivet 14 is broken, the ball seat 10 slides downward in the bushing 11 and the sliding valve 9, so that the ball seat 10 cannot block the first channel 901 and the second channel 201, and because the third channel 1101 and the fourth channel 1001 are blocked, the cement slurry entering the sliding valve 9 flows out along the first channel 901 and the second channel 201.

[0037] The working principle or working process of the embodiment is as follows: When the squeeze bridge plug of the embodiment works, first, the appropriate length of the oil pipe 7 is selected according to the depth of the well body to be set, so that after the squeeze bridge plug is extended into the inner cavity of the well body, the oil pipe 7 can drive the round head guide shoe 8 to extend to the bottom of the well body across the part of the formation loss in the well body. At the same time, the first cement filling amount required for the part below the lost circulation layer and the second cement filling amount required for the part above the lost circulation layer when the cement slurry is used to seal the well body are calculated according to the data of the well body to be set. Then, the mechanical setting tool 18 is connected with the central pipe 1, and the cement slurry is injected into the inner cavity of the central pipe 1 through the mechanical setting tool 18. After the cement slurry is injected into the central pipe 1, it flows downward to the ball seat 10 through the sliding valve 9. The cement slurry entering the ball seat 10 passes through the fourth channel 1001 and the third channel 1101 to enter the inner cavity of the first connecting sleeve 3. The cement slurry entering the inner cavity of the first connecting sleeve 3 continues to move downward along the first connecting sleeve 3, and then passes through the rotary joint 5, the coupling 6, the oil pipe 7 and the round head guide shoe 8 in turn to be injected into the bottom of the well body along the round head guide shoe 8. As the cement slurry injected into the well body continues to increase, the cement slurry entering the inner cavity of the well body along the squeeze bridge plug circulates upward, so that the liquid level of the cement slurry in the inner cavity of the well body also continues to rise, until the cement slurry injected into the well body reaches the first cement filling amount. At this time, the part below the lost circulation layer of the well body has completed the cement sealing, and the cement slurry moving from bottom to top has locally filled the lost circulation layer. When the cement is further injected from top to bottom, it can further avoid the cement escaping outward along the lost circulation layer.

[0038] After the cementing of the part below the lost circulation zone of the wellbore, the ball 12 is put into the center pipe 1, and the third passage 1101 and the fourth passage 1001 are blocked after the ball 12 is put into the center pipe 1, so that the circulation passage for injecting the cement slurry to the bottom of the wellbore is closed.

[0039] After the circulation passage is closed, the setting assembly 13 on the center pipe 1 is set by the mechanical setting tool 18. After the setting of the wellbore is completed, the cement slurry continues to be injected into the squeeze bridge plug. After the cement slurry continues to be injected, the ball seat 10 is subjected to a downward force due to the blocking of the downward path of the cement by the ball 12, the downward force on the ball seat 10 is transmitted to the rivet 14 as a shear force of the rivet 14, the shear force on the rivet 14 becomes larger until the rivet 14 is broken, after the rivet 14 is broken, the ball seat 10 slides downward in the bushing 11 and the spool 9 so that the ball seat 10 cannot block the first passage 901 and the second passage 201, and since the third passage 1101 and the fourth passage 1001 are blocked, the cement slurry entering the spool 9 flows out along the first passage 901 and the second passage 201. The cement slurry flowing out along the first passage 901 and the second passage 201 performs cement squeeze on the bottom layer until the second cement filling amount is reached, and then the spool 9 is lifted in the center pipe 1 by the mechanical setting tool 18, so that the first passage 901 and the second passage 201 are misaligned, and the closing of the squeeze passage is completed.

[0040] The beneficial effects of the embodiment are as follows: After the cement slurry is directly injected to the bottom of the wellbore through the third passage 1101 and the fourth passage 1001 of the recyclable squeeze bridge plug of the embodiment, the cement slurry circulates upward, avoiding the problem of cement escaping outward along the lost circulation zone of the wellbore during cementing, so that the cement slurry can fully fill the target area of the wellbore, avoiding the situation of formation blockage and excessively high permeability during cementing, and the cementing quality can meet the design requirements.

[0041] Embodiment Two The second embodiment of the recyclable squeeze bridge plug is as shown in Figure 1-10 The setting structure is further limited based on the first embodiment.

[0042] Specifically, the setting assembly 13 includes a release ring 1316 installed at the top of the inner cavity of the center pipe 1, and an upper slip protection sleeve 1301, an upper slip 1302, an upper cone 1303, an upper outer ring 1304, an upper inner ring 1305, an upper side rubber cylinder 1306, a middle rubber cylinder 1307, a lower side rubber cylinder 1308, a lower inner ring 1309, a lower outer ring 1310, a lower cone 1311, and a lower slip 1312 are sequentially arranged, and the lower slip 1312 can be clamped with the lower joint 2. The inner cavity of the upper slip protection sleeve 1301 is provided with a locking ring 1313 for preventing the upper slip protection sleeve 1301 from sliding in the direction of the upper slip 1302; the inner cavity of the upper slip 1302 is provided with a first clamping ring 1314 for preventing the upper slip 1302 from sliding in the direction of the upper slip protection sleeve 1301; The upper cone 1303, the upper outer ring 1304 and the upper inner ring 1305 are sequentially fixedly connected; the lower cone 1311, the lower outer ring 1310 and the lower inner ring 1309 are sequentially fixedly connected. The upper cone 1303, the upper outer ring 1304 and the upper inner ring 1305 are connected through a fixed pin, and the lower cone 1311, the lower outer ring 1310 and the lower inner ring 1309 are also connected through a fixed pin. The fixed pin can prevent relative rotation between the cone, the outer ring and the inner ring.

[0043] Specifically, the mechanical setting tool further comprises a setting joint package 15 for driving the setting assembly 13 to set the well body, the setting joint package 15 comprising a push cylinder 1501, a second connecting sleeve 1502, a fixed sleeve 1503, a pull rod 1504, a valve body push rod 1505, a shear pin 1506 and a torque transmission sleeve 1507. The push cylinder 1501 is used to connect with the outer pipe of the mechanical setting tool; the second connecting sleeve 1502 is located in the inner cavity of the push cylinder 1501 and is used to connect with the inner pipe of the mechanical setting tool; the torque transmission sleeve 1507 can be inserted into the central pipe 1 and is used to transmit torque. The pull rod 1504 is threadedly connected with the fixed sleeve 1503, and the pull rod 1504 and the fixed sleeve 1503 form a groove after being connected, which can accommodate the bottom of the second connecting sleeve 1502. The bottom of the second connecting sleeve 1502 is sleeved on the top of the valve body push rod 1505, and the bottom of the valve body push rod 1505 can extend into the inner cavity of the central pipe 1 and be connected with the sliding valve 9.

[0044] The setting joint package 15 further comprises the shear pin 1506 and a ball 1508. The shear pin 1506 passes through the torque transmission sleeve 1507 and the pull rod 1504, and the ball 1508 is located between the second connecting sleeve 1502 and the fixed sleeve 1503.

[0045] Specifically, the inner pipe and the outer pipe of the mechanical setting tool are connected in a threaded connection mode, that is, when the inner pipe of the mechanical setting tool is rotated, if the outer pipe of the mechanical setting tool cannot be rotated, the outer pipe of the mechanical setting tool will slide along the axial direction. After the setting joint package 15 is connected with the squeeze bridge plug, the push cylinder 1501 is sleeved on the outer sidewall of the central pipe 1 and can push the upper slip 1302 protection sleeve, thereby pushing the upper slip 1302 to be expanded along the upper cone 1303, and the riveting of the upper slip 1302 is completed. The top end of the outer sidewall of the central pipe 1 is provided with a key groove, and when the setting joint package 15 is connected with the squeeze bridge plug, the torque transmission sleeve 1507 can be inserted into the key groove at the top of the outer sidewall of the central pipe 1 to transmit torque.

[0046] The bottom of the second connecting sleeve 1502 is provided with a protrusion protruding outward, which can be clamped into the groove; the top of the valve push rod 1505 is also provided with a protrusion protruding outward, the protrusion of the valve push rod 1505 extends into the inner cavity of the protrusion of the second connecting sleeve 1502 and the two are attached, the outer side wall of the protrusion of the second connecting sleeve 1502 is attached to the bottom surface of the groove; the bottom surface of the protrusion of the valve push rod 1505 can abut against the lower end surface of the groove. The second connecting sleeve 1502 shell rotates in the groove, but when the downward pressure on the valve push rod 1505 is too large, the valve push rod 1505 will drive the pull rod 1504 to press down, and the pull rod 1504 will drive the fixing sleeve 1503 to press down, and after the fixing sleeve 1503 presses down on the second connecting sleeve 1502, the fixing sleeve 1503 and the second connecting sleeve 1502 can be driven to rotate together due to the friction therebetween, the fixing sleeve 1503 drives the pull rod 1504 to rotate, the pull rod 1504 drives the torque sleeve 1507 to rotate, and the torque sleeve 1507 drives the central pipe 1 to rotate.

[0047] Specifically, the outer side walls of the upper slips 1302 and the lower slips 1312 are both sleeved with hoops 1315 to prevent them from scattering.

[0048] The working principle or working process of the embodiment is as follows: When the setting assembly 13 sets and seals the well body, the upper slip protection sleeve 1301 moves downward to extrude the upper slips 1302, so that the upper slips 1302 are expanded along the upper cone 1303 to abut against the side wall of the inner sleeve of the well body, and the riveting of the upper slips 1302 on the inner sleeve of the well body is completed. Then the central pipe 1 is lifted upward, so that the lower slips 1312 move upward to expand along the lower cone 1311 to abut against the side wall of the inner sleeve of the well body, and the setting and sealing of the well body are completed. In the process of upward movement of the lower slips 1312, the upper rubber cylinder 1306, the middle rubber cylinder 1307 and the lower rubber cylinder 1308 are extruded, so that the rubber material in the rubber cylinder is extruded and deformed to tightly attach to the inner sleeve of the well body, sealing the well body. The setting of the upper covering ring 1304 and the lower covering ring 1310 can avoid the flow rate of the rubber material in the rubber cylinder, thereby improving the sealing capacity of the rubber cylinder.

[0049] The mechanical setting tool and the setting joint pack 15 are connected, and then the setting assembly 13 is set. At this time, the inner tube of the mechanical setting tool rotates upward to drive the second connecting sleeve 1502 to rotate upward. The second connecting sleeve 1502 rotates upward to drive the transmission sleeve 1507 to rotate upward through the fixed sleeve 1503 and the pull rod 1504. The transmission sleeve 1507 rotates upward to drive the center tube 1 to rotate upward. However, at this time, the outer tube of the mechanical setting tool does not move, that is, the push cylinder 1501 does not move. When the center tube 1 drives the setting assembly 13 to move upward, the push cylinder 1501 pushes the upper slip 1302 protection sleeve, and then pushes the upper slip 1302 to expand along the upper taper 1303, and the riveting of the upper slip 1302 is completed. After the riveting of the upper slip 1302 is completed, the center tube 1 is pulled upward, and the riveting of the lower slip 1312 is completed, and then the setting of the well body is completed. When the setting of the well body is completed, the release ring 1316 is broken. After the setting of the well body is completed, the mechanical setting tool and the setting joint pack 15 are pulled out, and the second cement injection is performed. After the cement injection is completed, the setting joint pack 15 is connected with the center tube 1 again. At this time, the pull rod 1504 is pulled upward to drive the slide valve 9 to move upward and block the cement passage.

[0050] When the setting joint pack 15 is inserted again, if the transmission sleeve 1507 does not smoothly insert into the key groove of the center tube 1, the shear pin 1506 between the transmission sleeve 1507 and the pull rod 1504 is broken under stress, so that the pull rod 1504 can continue to move downward to be connected with the slide valve 9.

[0051] The beneficial effects of the embodiment are as follows: The setting of the setting joint pack 15 can reduce the large torque required during rotation, protect the pipe string, the tool and the operation safety, and then solve the problem that the torque generated during rotation is transmitted to the center tube 1 of the squeeze bridge plug through the transmission sleeve, better protect the release ring 1316, and prevent the release ring 1316 from being broken due to excessive torque, causing the setting failure of the squeeze bridge plug.

[0052] The setting of the shear pin 1506 can make the pull rod 1504 continue to move downward to be connected with the slide valve 9 when the transmission sleeve 1507 does not smoothly insert into the key groove of the center tube 1. The setting of the ball 1508 can further reduce the friction between the second connecting sleeve 1502 and the fixed sleeve 1503, and avoid mechanical wear when the second connecting sleeve 1502 drives the fixed sleeve 1503 to rotate.

[0053] Embodiment three The third embodiment of the recyclable squeeze bridge plug is shown in Figure 1-10 The embodiment is further limited to other structures on the basis of the second embodiment.

[0054] Specifically, the end of the slide valve 9 that extends into the central tube 1 is provided with an elastic claw 902. Between two adjacent claw teeth 922 of the elastic claw 902, there is a deformation groove 921 that allows the claw teeth 922 to deform. The end of the claw teeth 922 is provided with a snap-fit ​​protrusion 923. The inner side wall of the central tube 1 is provided with a snap-fit ​​groove 101 that can engage with the snap-fit ​​protrusion 923. The slide valve 9 can slide until the snap-fit ​​protrusion 923 extends into the snap-fit ​​groove 101.

[0055] The inner cavity of the claw teeth 922 of the elastic claw 902 is provided with a protrusion, and the side wall of the valve body push rod 1505 is provided with a groove for the protrusion to engage. When it is necessary to lift the slide valve 9, the setting connector package 15 is inserted into the central tube 1 again to make the protrusion engage with the groove. At this time, the slide valve 9 can be lifted through the setting connector package 15.

[0056] When the locking protrusion 923 is not engaged with the locking groove 101, the sidewall of the locking protrusion 923 is in contact with the inner sidewall of the central tube 1, that is, the claw teeth 922 of the elastic claw 902 are slightly close to the axis of the central tube 1. When the slide valve 9 slides upward until the locking protrusion 923 of the elastic claw 902 is aligned with the locking groove 101, under the action of the elastic force of the claw teeth 922, the claw teeth 922 expand outward, causing the locking protrusion 923 to engage in the locking groove 101, thus completing the fixation of the slide valve 9 in the central tube 1.

[0057] Specifically, a guide pin 102 is fixedly installed on the side wall of the central tube 1, and a guide groove is provided on the slide valve 9. One end of the guide pin 102 passes through the side wall of the central tube 1, extends into the guide groove, and slides in connection with the guide groove.

[0058] Specifically, the bushing 11 is provided with a groove 1102, which is located at the bottom of the inner side wall of the bushing 11. The ball seat 10 is provided with a second retaining ring 1002 on its side wall. When the rivet 14 breaks, the ball seat 10 can slide towards the round-headed shoe 8 until the second retaining ring 1002 engages with the groove 1102.

[0059] The fourth channel 1001 on the ball seat 10 is located at the bottom of the side wall of the ball seat 10. The middle of the inner cavity of the ball seat 10 is provided with a stepped surface to prevent the blocking ball 12 from falling further. The part of the stepped surface that contacts the blocking ball 12 is an arc-shaped surface that can fit the blocking ball 12.

[0060] The top of the ball seat 10 is provided with a guide ramp to allow the sealing ball 12 to smoothly enter the inner cavity of the ball seat 10.

[0061] The second retaining ring 1002 is a C-ring. When the ball seat 10 does not slide, the second retaining ring 1002 is tightly fitted to the inner wall of the bushing 11. When the ball seat 10 slides down to the point where the second retaining ring 1002 is directly opposite the groove 1102, the second retaining ring 1002 pops outward and engages with the groove 1102, thereby fixing the ball seat 10 in the bushing 11.

[0062] Specifically, the first connecting sleeve 3 is connected with the lock cap 4, and a positioning groove is formed between the first connecting sleeve 3 and the lock cap 4, and the end of the rotary joint 5 extending into the inner cavity of the lock cap 4 is provided with a positioning protrusion located in the positioning groove, and the positioning protrusion is rotationally connected with the positioning groove.

[0063] Specifically, the positioning groove is further provided with a bearing 16, and the two ends of the bearing 16 abut against the positioning groove and the positioning protrusion, respectively. In the vertical direction, the two end faces of the bearing 16 abut against the bottom surface of the positioning protrusion and the bottom surface of the positioning groove, respectively.

[0064] Specifically, a release ring 1316 is arranged between two adjacent or sleeved components, and the release ring 1316 is a sealing ring or a sealing ring provided with sealing back rings on both sides.

[0065] The beneficial effects of the embodiment are as follows: The guide pin 102 can avoid the rotation of the spool 9 in the center pipe 1. The first connecting sleeve 3 and the lock cap 4 are connected through the positioning groove and the rotary joint 5 provided with the positioning protrusion, thereby achieving the rotational connection between the rotary joint 5 and the lock cap 4. The arrangement of the bearing 16 can reduce the friction between the positioning protrusion and the positioning groove during rotation, so that the resistance of the rotary joint 5 during rotation is smaller. The sealing back ring can provide support for the sealing ring, so that the sealing performance of the sealing ring is better.

[0066] In the specific content of the above specific embodiments, any technically consistent combination of technical features can be combined, and in order to make the description concise, not all possible combinations of the above technical features are described, but as long as the combination of technical features does not exist, it should be considered as the scope of the present application.

[0067] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, other different forms of changes or modifications can be made on the basis of the above description. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A recyclable injection bridge plug, characterized in that, It includes a central tube (1), a lower connector (2), a first connecting sleeve (3) and a locking cap (4) connected in sequence; a rotary joint (5), a coupling (6), an oil pipe (7) and a round-headed guide shoe (8) connected in sequence; and a slide valve (9), a ball seat (10), a bushing (11), a sealing ball (12) that can be fixed to the ball seat (10) and a setting and sealing assembly (13) provided on the central tube (1); The rotary joint (5) is rotatably connected to the locking cap (4); the two ends of the slide valve (9) extend into the inner cavity of the central tube (1) and the lower joint (2) respectively, and the slide valve (9) can slide along the central tube (1). The slide valve (9) is provided with a first channel (901), and the side wall of the lower joint (2) is provided with a second channel (201) that can communicate with the first channel (901); one end of the bushing (11) is fixed to the inner cavity of the lower joint (2), and the other end extends into the inner cavity of the first connecting sleeve (3); The two ends of the ball seat (10) extend into the inner cavity of the lower connector (2) and the bushing (11), respectively. The bushing (11) and the ball seat (10) are connected by rivets (14). The bushing (11) has a third channel (1101) on its side wall and the ball seat (10) has a fourth channel (1001) on its side wall. When the rivet (14) is not broken, the third channel (1101) and the fourth channel (1001) are connected.

2. The recyclable injection bridge plug according to claim 1, characterized in that, The setting assembly (13) includes a release ring (1316) installed at the top of the inner cavity of the central tube (1) and, in sequence, an upper slip protective sleeve (1301), an upper slip (1302), an upper cone (1303), an upper outer sheath ring (1304), an upper inner sheath ring (1305), an upper rubber sleeve (1306), a middle rubber sleeve (1307), a lower rubber sleeve (1308), a lower inner sheath ring (1309), a lower outer sheath ring (1310), a lower cone (1311), and a lower slip (1312). The lower slip (1312) can be engaged with the lower connector (2). The inner cavity of the upper slip protective sleeve (1301) is provided with a locking ring (1313) to prevent the upper slip protective sleeve (1301) from sliding in the direction of the upper slip (1302); the inner cavity of the upper slip (1302) is provided with a first retaining ring (1314) to prevent the upper slip (1302) from sliding in the direction of the upper slip protective sleeve (1301); The upper cone (1303), the upper outer sheath (1304), and the upper inner sheath (1305) are fixedly connected in sequence; the lower cone (1311), the lower outer sheath (1310), and the lower inner sheath (1309) are fixedly connected in sequence.

3. The recyclable injection bridge plug according to claim 2, characterized in that, It also includes a setting connector package (15) for driving the setting assembly (13) to set the well body by a mechanical setting tool (18), the setting connector package (15) including a pusher (1501), a second connecting sleeve (1502), a fixing sleeve (1503), a pull rod (1504), a valve body push rod (1505), a shear pin (1506), and a torque transmission sleeve (1507); The push cylinder (1501) is used to connect with the outer tube of the mechanical setting tool (18); the second connecting sleeve (1502) is located in the inner cavity of the push cylinder (1501) and is used to connect with the inner tube of the mechanical setting tool (18); the torque transmission sleeve (1507) can be inserted into the central tube (1) to transmit torque; The pull rod (1504) is threadedly connected to the fixed sleeve (1503). After the pull rod (1504) and the fixed sleeve (1503) are connected, a groove is formed that can accommodate the bottom of the second connecting sleeve (1502). The bottom of the second connecting sleeve (1502) is sleeved on the top of the valve body push rod (1505). The bottom of the valve body push rod (1505) can extend into the inner cavity of the central tube (1) and connect to the slide valve (9).

4. A recyclable injection bridge plug according to claim 3, characterized in that, It also includes a shear pin (1506) and a ball (1508), the shear pin (1506) passing through the torsion sleeve (1507) and the pull rod (1504), and the ball (1508) located between the second connecting sleeve (1502) and the fixing sleeve (1503).

5. A recyclable injection bridge plug according to claim 2, characterized in that, The outer walls of both the upper slip (1302) and the lower slip (1312) are fitted with hoop rings (1315) to prevent them from falling off.

6. A recyclable injection bridge plug according to claim 1, characterized in that, The slide valve (9) has an elastic claw (902) extending into the central tube (1) at one end. The elastic claw (902) has a deformation groove (921) between two adjacent claw teeth (922) for deformation of the claw teeth (922). The end of the claw teeth (922) has a snap-fit ​​protrusion (923). The inner wall of the central tube (1) has a snap-fit ​​groove (101) that can engage with the snap-fit ​​protrusion (923). The slide valve (9) can slide until the snap-fit ​​protrusion (923) extends into the snap-fit ​​groove (101).

7. A recyclable injection bridge plug according to claim 6, characterized in that, A guide pin (102) is fixedly installed on the side wall of the central tube (1). A guide groove is provided on the slide valve (9). One end of the guide pin (102) passes through the side wall of the central tube (1), extends into the guide groove, and slides in connection with the guide groove.

8. A recyclable injection bridge plug according to claim 1, characterized in that, The bushing (11) is provided with a slot (1102), which is located at the bottom of the inner sidewall of the bushing (11). The ball seat (10) is provided with a second retaining ring (1002) on its sidewall. When the rivet (14) breaks, the ball seat (10) can slide towards the round-toed shoe (8) until the second retaining ring (1002) engages with the slot (1102).

9. A recyclable injection bridge plug according to claim 1, characterized in that, After the first connecting sleeve (3) is connected to the lock cap (4), a positioning groove is formed between the first connecting sleeve (3) and the lock cap (4). One end of the rotary joint (5) that extends into the inner cavity of the lock cap (4) is provided with a positioning protrusion located in the positioning groove. The positioning protrusion is rotatably connected to the positioning groove.

10. A recyclable injection bridge plug according to claim 9, characterized in that, A bearing (16) is also installed in the positioning groove, and the two ends of the bearing (16) abut against the positioning groove and the positioning protrusion respectively.

Images