Locking mechanism of transmission unit of stratum isolation valve

Abstract

The invention belongs to the technical field of stratum isolation valves, and particularly relates to a locking mechanism of a stratum isolation valve transmission unit, which comprises a piston cylinder, a locking mechanism and a locking mechanism, and the inner wall of the piston cylinder is connected with a starting mechanism in a sliding manner; the locking mechanism of the stratum isolation valve transmission unit further comprises a sealing mechanism, the outer wall of the sealing mechanism is fixedly connected with the end, away from the starting mechanism, of the piston barrel, and the outer wall of the end, away from the piston barrel, of the sealing mechanism is fixedly connected with a pressure bearing sleeve. Due to the shape of the limiting claw and the material with certain elasticity, the limiting claw deforms and is clamped in the movable limiting sleeve, the locking assembly is prevented from being opened and closed accidentally, the limiting claw provides an initial force value for limiting opening and closing of the locking assembly, the locking assembly is effectively prevented from being opened and closed accidentally, and a sealing cavity is formed in the position where the limiting claw is located. And failure of the limiting claw caused by mud deposition during use can be prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of formation isolation valves, and specifically relates to a locking mechanism for a drive unit of a formation isolation valve. Background Art

[0002] In China, conventional formation isolation valves adopt plate valve designs, which can only bear pressure unidirectionally. When the valve needs to be opened, a special wire tool or coiled tubing must be used for breaking operations. This not only has the problem that impurity precipitation makes it difficult to open the valve, but also increases the high cost of using coiled tubing. In contrast, the mainstream foreign formation isolation valve design is a ball valve type, which can bear pressure bidirectionally and has a higher pressure-bearing capacity. However, the application conditions of the ball valve type formation isolation valve are limited, with high costs, long supply cycles, and relatively high failure rates in on-site applications.

[0003] To avoid the high cost of using coiled tubing, the limited scope of application of unidirectional pressure bearing, and the risk of accidental opening of the isolation valve during downhole operations. By using a switch tool with unlimited usage times to avoid using coiled tubing, adopting a ball valve type isolation valve to achieve bidirectional pressure bearing, and using a limit claw to limit the initial force value of the ball valve opening and closing, to prevent the ball valve from accidentally opening during downhole operations. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve its technical problems is: a locking mechanism for a drive unit of a formation isolation valve, including: a piston cylinder, and a starting mechanism is slidably connected to the inner wall of the piston cylinder;

[0005] The locking mechanism for the drive unit of the formation isolation valve further includes:

[0006] A sealing mechanism, the outer wall of the sealing mechanism is fixedly connected to one end of the piston cylinder away from the starting mechanism;

[0007] The sealing mechanism includes a sealing cylinder, the outer wall of the sealing cylinder is fixedly connected to the inner wall of the piston cylinder, a moving limit sleeve is slidably connected to the inner wall of the sealing cylinder, a limit claw is slidably connected to the inner wall of the moving limit sleeve, protrusions are uniformly arranged on the outer wall of the limit claw, a support cylinder is slidably connected to the inner wall of the limit claw, and a locking assembly is installed on the outer wall of one end of the support cylinder away from the piston cylinder.

[0008] Furthermore, a pressure-bearing sleeve is fixedly connected to the outer wall of one end of the sealing mechanism away from the piston cylinder, a pressure-bearing mechanism is arranged on the inner wall of one end of the pressure-bearing sleeve away from the sealing mechanism, and the outer wall of the pressure-bearing mechanism is sleeved with the inner wall of the pressure-bearing sleeve.

[0009] Furthermore, the sealing mechanism further includes a guiding sleeve, the outer wall of the guiding sleeve is fixedly connected to the inner wall of the locking component, an upper ball valve support is provided at one end of the guiding sleeve away from the support cylinder, the outer wall of the upper ball valve support is slidably connected to the inner wall of the locking component, a lower ball valve support is provided at one end of the locking component away from the support cylinder, the inner wall of the lower ball valve support is clamped with the outer wall of the locking component, the outer wall of the lower ball valve support is slidably connected to the inner wall of the pressure-bearing sleeve, one end of the lower ball valve support away from the locking component is fixedly connected to the outer wall of the pressure-bearing mechanism, a sealing seat is provided on the inner wall of the lower ball valve support, the outer wall of the sealing seat is sleeved with the inner wall of the lower ball valve support, one end of the sealing seat is in contact with the outer wall of the locking component, and the other end of the sealing seat is sleeved with the inner wall of the pressure-bearing mechanism. The auxiliary component drives the profiled sleeve and the floating sleeve to move, and then drives the support cylinder to move. The support cylinder drives the locking component to open or close. When the support cylinder moves, it drives the external limit claw to move and catch in the moving limit sleeve. When the limit claw is extruded by an external force, due to its shape setting and the material with a certain elasticity, the limit claw deforms, so as to catch in the moving limit sleeve, preventing the ball valve from being accidentally opened or closed. The limit claw provides the initial force value for restricting the opening and closing of the ball valve, effectively preventing the ball valve from being accidentally opened or closed. Moreover, the position where the limit claw is located forms a sealed cavity, which can prevent the limit claw from failing due to mud deposition during use.

[0010] Furthermore, the starting mechanism includes a floating piston, the outer wall of the floating piston is slidably connected to the inner wall of the piston cylinder, a floating sleeve is slidably connected to the inner wall of the floating piston, a profiled sleeve is provided at one end of the floating sleeve away from the sealing mechanism, one end of the profiled sleeve is clamped with the end of the floating sleeve away from the sealing mechanism, and an auxiliary component is slidably connected to the inner wall of the profiled sleeve. By controlling the movement of the auxiliary component, the profiled sleeve can be moved, and then the floating sleeve can be pushed to move, so as to control the opening and closing of the sealing mechanism. The inner wall of the auxiliary component can adjust the pressure on the inner wall of the profiled sleeve according to the magnitude of the liquid pressure. When the liquid pressure is relatively high, the force for pushing the auxiliary component needs to be maintained to keep the sealing mechanism open, avoiding the valve from closing before the pressure is fully relieved. Through dual control, the controllability of the force on the profiled sleeve is enhanced.

[0011] Furthermore, the pressure-bearing mechanism includes a reduced-coupling nipple. The outer wall of the reduced-coupling nipple is sleeved with the inner wall of the pressure-bearing sleeve. A piston ring is slidably connected to the outer wall of the reduced-coupling nipple. One end of the piston ring away from the reduced-coupling nipple is fixedly connected to a positioning spring. The end of the positioning spring away from the piston ring is fixedly connected to the outer wall of the lower ball valve support. During use, the upper ball valve support and the lower ball valve support play a role in straightening and contact the ball valve. The seal seat seals with the ball valve to achieve pressure-bearing at the upper and lower ends. When the ball valve bears upward pressure, the seal seat moves upward to seal with the ball valve. When the ball valve bears downward pressure, the seal seat still moves upward to seal with the ball valve. The mechanical switch can move in the reverse direction, thereby forming an unlimited number of times to open and close the ball valve, greatly reducing the number of times of using coiled tubing.

[0012] Furthermore, the locking prevention assembly includes a driving claw. The inner wall of the driving claw is clamped with the outer wall of the support cylinder. The inner wall of the driving claw is sleeved with the outer wall of the upper ball valve support. There are two driving claws symmetrically arranged. A driving claw cylindrical shaft is fixedly connected to the opposite side of the driving claws. A rotary pin sleeve is slidably connected to the outer wall of the driving claw cylindrical shaft. A spherical center bearing is slidably connected to the inner wall of the driving claw near the rotary pin sleeve. The inner wall of the spherical center bearing is slidably connected to a ball valve. The outer wall of the ball valve is sleeved with the inner wall of the upper ball valve support. A through hole is formed in the inner wall of the ball valve. Sliding grooves are symmetrically formed in the outer wall of the ball valve. The outer wall of the driving claw cylindrical shaft is in contact with the inner wall of the sliding groove. A positioning plate is arranged on the outer wall of the driving claw. The outer wall of the positioning plate is clamped with the inner wall of the driving claw. The ball valve connected to the driving claw deflects the ball valve by moving in the sliding groove under the action of the driving claw cylindrical shaft and the rotary pin sleeve, so that the through hole of the ball valve communicates with and closes the support cylinder, thereby forming the opening and closing of the ball valve. The seal cylinder, the support cylinder, the floating piston, the floating sleeve, and the piston cylinder form a closed liquid cavity, protecting the limit claw and the moving limit sleeve in the pre-injected liquid, preventing mud from entering and depositing, resulting in the failure of its mechanism. Through cooperation with the pressure-bearing mechanism, the ball valve can be opened and closed an unlimited number of times.

[0013] Furthermore, the auxiliary component includes a moving pipe. A control sliding sleeve is arranged on the outer wall of the moving pipe. The inner wall of the control sliding sleeve is clamped with the outer wall of the moving pipe. The outer wall of the control sliding sleeve is slidably connected with the inner wall of the profiled sleeve. The outer wall of the control sliding sleeve is evenly provided with bumps. The inner wall of the moving pipe is symmetrically provided with curved surface rings. The outer wall of the curved surface ring is fixedly connected with the inner wall of the moving pipe. The outer wall of the curved surface ring is evenly provided with connecting rods. One end of the connecting rod is fixedly connected with the outer wall of the curved surface ring. The other end of the connecting rod is fixedly connected with a conical ring. The inner wall of the conical ring is slidably connected with the outer wall of the moving pipe. The outer wall of the conical ring is sleeved with the inner wall of the control sliding sleeve. The outer wall of the connecting rod is slidably connected with the inner wall of the moving pipe. Since the connecting rod is restricted by the control sliding sleeve, it can only push the conical ring forward, making the conical ring move towards the middle of the control sliding sleeve, padding the gap between the control sliding sleeve and the outer wall of the moving pipe, thereby enhancing the stiffness of the control sliding sleeve, making the control sliding sleeve stuck in the profiled sleeve, keeping the valve open, preventing the valve from closing when the liquid pressure is still relatively strong, making the pressure relief threshold of the liquid pressure more accurate, and the profile of the control sliding sleeve and the profiled sleeve can provide force values for the opening and closing of the ball valve without limit on the number of times.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. By setting the sealing mechanism in the present invention, when the limit claw is extruded by an external force, due to its shape setting and the material with a certain elasticity, the limit claw deforms, thus getting stuck in the moving limit sleeve, preventing the anti-lock component from being accidentally opened or closed. The limit claw provides the initial force value for restricting the opening and closing of the anti-lock component, effectively preventing the anti-lock component from being accidentally opened or closed, and the position where the limit claw is located forms a sealed cavity, which can prevent the limit claw from failing due to mud deposition during use.

[0016] 2. By setting the starting mechanism in the present invention, by controlling the movement of the auxiliary component, the profiled sleeve can be moved, and then the floating sleeve can be pushed to move, thereby controlling the opening and closing of the sealing mechanism. The inner wall of the auxiliary component can adjust the pressure on the inner wall of the profiled sleeve according to the magnitude of the liquid pressure received. When the liquid pressure is relatively large, it is necessary to maintain the force for pushing the auxiliary component to keep the sealing mechanism open, preventing the valve from closing before the pressure is fully relieved. Through dual control, the controllability of the force on the profiled sleeve is enhanced.

[0017] 3. By setting the pressure-bearing mechanism in the present invention, during use, the upper ball valve support and the lower ball valve support play a straightening role and contact the ball valve. The sealing seat seals with the ball valve to achieve pressure-bearing at the upper and lower ends. When the ball valve bears an upward pressure, the sealing seat moves upward to seal with the ball valve. When the ball valve bears a downward pressure, the sealing seat still moves upward to seal with the ball valve. The mechanical switch can move in the reverse direction, thereby forming an unlimited number of times to open and close the ball valve, greatly reducing the number of times of using the coiled tubing.

[0018] 4. By providing a locking prevention assembly in the present invention, when the support cylinder drives the driving claw to move, the ball valve connected to the driving claw, under the action of the cylindrical shaft of the driving claw and the pin sleeve, deflects by moving in the chute, so that the through-hole of the ball valve communicates with and closes the support cylinder, thereby forming the opening and closing of the ball valve. The sealing cylinder, the support cylinder, the floating piston, the floating sleeve, and the piston cylinder form a closed liquid cavity, protecting the limiting claw and the moving limiting sleeve in the pre-injected liquid, preventing mud from entering and depositing, resulting in the failure of its mechanism. Through cooperation with the pressure-bearing mechanism, the ball valve can be opened and closed an unlimited number of times. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the present invention;

[0020] Figure 2 is a sectional view of the present invention;

[0021] Figure 3 is a sectional view of the sealing mechanism of the present invention;

[0022] Figure 4 is a partial schematic structural view of the sealing mechanism of the present invention;

[0023] Figure 5 is a schematic structural view of the pressure-bearing mechanism of the present invention;

[0024] Figure 6 is a schematic structural view of the starting mechanism of the present invention;

[0025] Figure 7 is a schematic structural view of the locking prevention assembly of the present invention;

[0026] Figure 8 is a partial schematic structural view of the locking prevention assembly of the present invention;

[0027] Figure 9 is a schematic structural view of the ball valve of the present invention;

[0028] Figure 10 is a schematic structural view of the auxiliary assembly of the present invention.

[0029] In the figure: 1, piston cylinder; 2, sealing mechanism; 201, sealing cylinder; 202, limiting claw; 203, moving limiting sleeve; 204, protrusion; 205, locking prevention assembly; 2051, driving claw; 2052, spherical center bearing; 2053, driving claw cylindrical shaft; 2054, rotating pin sleeve; 2055, ball valve; 2056, through hole; 2057, sliding groove; 2058, positioning plate; 206, guiding sleeve; 207, upper ball valve support; 208, lower ball valve support; 209, support cylinder; 210, sealing seat; 3, pressure-bearing sleeve; 4, pressure-bearing mechanism; 401, variable-coupling short joint; 402, piston ring; 403, positioning spring; 5, starting mechanism; 501, profiled sleeve; 502, floating sleeve; 503, auxiliary assembly; 5031, moving pipe; 5032, curved surface ring; 5033, connecting rod; 5034, conical ring; 5035, control sliding sleeve; 5036, convex block; 504, floating piston. Detailed implementation mode

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and the detailed implementation mode. The embodiments of the present invention are given for the purpose of illustration and description, and are not exhaustive or limited to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0031] Example 1, please refer to Figures 1-6 , the present invention provides a technical solution: A locking prevention mechanism of a formation isolation valve transmission unit is described as follows.

[0032] It includes: a piston cylinder 1, and a starting mechanism 5 is slidably connected to the inner wall of the piston cylinder 1;

[0033] The locking prevention mechanism of the formation isolation valve transmission unit further includes:

[0034] A sealing mechanism 2, and the outer wall of the sealing mechanism 2 is fixedly connected to one end of the piston cylinder 1 away from the starting mechanism 5;

[0035] The outer wall of one end of the sealing mechanism 2 away from the piston cylinder 1 is fixedly connected to a pressure-bearing sleeve 3, and a pressure-bearing mechanism 4 is arranged on the inner wall of one end of the pressure-bearing sleeve 3 away from the sealing mechanism 2, and the outer wall of the pressure-bearing mechanism 4 is sleeved with the inner wall of the pressure-bearing sleeve 3.

[0036] During operation, through the tight connection between the piston cylinder 1 and the pressure-bearing sleeve 3, a relatively enclosed space is formed between the piston cylinder 1, the pressure-bearing sleeve 3, and the outside of the sealing mechanism 2. When the starting mechanism 5 is subjected to an external force, it can move inside the piston cylinder 1, thereby triggering the internal movement of the sealing mechanism 2, and then meeting the conditions for valve opening and closing, and realizing pressure regulation.

[0037] The starting mechanism 5 includes a floating piston 504. The floating piston 504 is used to block the gap between the piston cylinder 1 and the floating sleeve 502. The outer wall of the floating piston 504 is slidably connected to the inner wall of the piston cylinder 1. The inner wall of the floating piston 504 is slidably connected with a floating sleeve 502. A profiled sleeve 501 is arranged at one end of the floating sleeve 502 away from the sealing mechanism 2. One end of the profiled sleeve 501 is clamped with the end of the floating sleeve 502 away from the sealing mechanism 2. An auxiliary component 503 is slidably connected to the inner wall of the profiled sleeve 501.

[0038] By controlling the movement of the auxiliary component 503, the profiled sleeve 501 can be moved, and then the floating sleeve 502 can be pushed to move, so as to control the opening and closing of the sealing mechanism 2. The inner wall of the auxiliary component 503 can adjust the pressure on the inner wall of the profiled sleeve 501 according to the magnitude of the liquid pressure. When the liquid pressure is relatively high, the force for pushing the auxiliary component 503 needs to be maintained to keep the sealing mechanism 2 open, so as to prevent the valve from closing before the pressure is fully relieved. Through dual control, the controllability of the force on the profiled sleeve 501 is enhanced.

[0039] The sealing mechanism 2 includes a sealing cylinder 201. The outer wall of the sealing cylinder 201 is fixedly connected to the inner wall of the piston cylinder 1. A movable limiting sleeve 203 is slidably connected to the inner wall of the sealing cylinder 201. A limiting claw 202 is slidably connected to the inner wall of the movable limiting sleeve 203. Protrusions 204 and slits are evenly arranged on the outer wall of the limiting claw 202, and it cannot move within a certain force value. Corresponding grooves are provided in the movable limiting sleeve 203 so that the limiting claw 202 can be stuck in the grooves. By adjusting the movable limiting sleeve 203, the limiting position of the limiting claw 202 can be adjusted. A support cylinder 209 is slidably connected to the inner wall of the limiting claw 202. A locking prevention assembly 205 is installed on the outer wall of the end of the support cylinder 209 away from the piston cylinder 1. The sealing mechanism 2 further includes a guiding sleeve 206. The outer wall of the guiding sleeve 206 is fixedly connected to the inner wall of the locking prevention assembly 205. An upper ball valve support 207 is provided at the end of the guiding sleeve 206 away from the support cylinder 209. The outer wall of the upper ball valve support 207 is slidably connected to the inner wall of the locking prevention assembly 205. A lower ball valve support 208 is provided at the end of the locking prevention assembly 205 away from the support cylinder 209. The driving claw 2051 clamps the guiding sleeve 206, the upper ball valve support 207, and the ball valve 2055 in the middle, and the lower end is inserted into the groove of the lower ball valve support 208. The inner wall of the lower ball valve support 208 is engaged with the outer wall of the locking prevention assembly 205. The outer wall of the lower ball valve support 208 is slidably connected to the inner wall of the pressure-bearing sleeve 3. The end of the lower ball valve support 208 away from the locking prevention assembly 205 is fixedly connected to the outer wall of the pressure-bearing mechanism 4. A sealing seat 210 is provided on the inner wall of the lower ball valve support 208. The outer wall of the sealing seat 210 is sleeved with the inner wall of the lower ball valve support 208. One end of the sealing seat 210 is in contact with the outer wall of the locking prevention assembly 205, and the other end of the sealing seat 210 is sleeved with the inner wall of the pressure-bearing mechanism 4.

[0040] During operation, the auxiliary component 503 drives the profiled sleeve 501 and the floating sleeve 502 to move, thereby driving the support cylinder 209 to move. The support cylinder 209 drives the locking prevention assembly 205 to open or close. When the support cylinder 209 moves, it drives the external limiting claw 202 to move and get stuck in the movable limiting sleeve 203. When the limiting claw 202 is externally squeezed, due to its shape setting and a material with a certain elasticity, the limiting claw 202 deforms and thus gets stuck in the movable limiting sleeve 203, preventing the locking prevention assembly 205 from being accidentally opened or closed. The limiting claw 202 provides the initial force value for restricting the opening and closing of the locking prevention assembly 205, effectively preventing the locking prevention assembly 205 from being accidentally opened or closed. Moreover, the position where the limiting claw 202 is located forms a sealed cavity, which can prevent the mud deposition during use from causing the limiting claw 202 to fail.

[0041] The pressure-bearing mechanism 4 includes a reducer nipple 401. The outer wall of the reducer nipple 401 is sleeved with the inner wall of the pressure-bearing sleeve 3. A piston ring 402 is slidably connected to the outer wall of the reducer nipple 401. One end of the piston ring 402 away from the reducer nipple 401 is fixedly connected to a positioning spring 403. One end of the positioning spring 403 away from the piston ring 402 is fixedly connected to the outer wall of the lower ball valve support 208. The positioning spring 403 can drive the sealing seat 210 to move. The piston ring 402 is installed at the lower end of the sealing cylinder 201. During use, the upper ball valve support 207 and the lower ball valve support 208 play a centering role and contact the ball valve 2055. The sealing seat 210 is sealed with the ball valve 2055 to achieve pressure-bearing at the upper and lower ends. When the ball valve 2055 bears an upward pressure, the sealing seat 210 moves upward to seal with the ball valve 2055. When the ball valve 2055 bears a downward pressure, the sealing seat 210 still moves upward to seal with the ball valve 2055. The mechanical switch can move in the reverse direction, thereby enabling the ball valve 2055 to be opened and closed an unlimited number of times, greatly reducing the number of times of using coiled tubing.

[0042] Embodiment 2. Please refer to Figures 1-10 , the present invention provides a technical solution: on the basis of Embodiment 1, the locking prevention assembly 205 includes a driving claw 2051. The inner wall of the driving claw 2051 is clamped with the outer wall of the support cylinder 209. The inner wall of the driving claw 2051 is sleeved with the outer wall of the upper ball valve support 207. There are two driving claws 2051 symmetrically arranged. A driving claw cylindrical shaft 2053 is fixedly connected to the opposite side of the driving claws 2051. A rotating pin sleeve 2054 is slidably connected to the outer wall of the driving claw cylindrical shaft 2053. A spherical center bearing 2052 is slidably connected to the inner wall of the driving claw 2051 near the rotating pin sleeve 2054. A ball valve 2055 is slidably connected to the inner wall of the spherical center bearing 2052. The outer wall of the ball valve 2055 is sleeved with the inner wall of the upper ball valve support 207. A through hole 2056 is opened in the inner wall of the ball valve 2055. Chute grooves 2057 are symmetrically opened on the outer wall of the ball valve 2055. The chute grooves 2057 on both sides of the ball valve 2055 are installed together with the driving claw cylindrical shaft 2053. The grooves of the upper ball valve support 207 and the lower ball valve support 208 are on the same side as the grooves of the ball valve 2055. The outer wall of the driving claw cylindrical shaft 2053 is in contact with the inner wall of the chute groove 2057. A positioning plate 2058 is arranged on the outer wall of the driving claw 2051. The outer wall of the positioning plate 2058 is clamped with the inner wall of the driving claw 2051.

[0043] When the support cylinder 209 drives the driving claw 2051 to move, the ball valve 2055 connected to the driving claw 2051, under the action of the driving claw cylindrical shaft 2053 and the rotating pin sleeve, deflects by moving in the chute 2057, causing the through hole 2056 of the ball valve 2055 to communicate with and close the support cylinder 209, thereby forming the opening and closing of the ball valve 2055. The sealing cylinder 201, the support cylinder 209, the floating piston 504, the floating sleeve 502, and the piston cylinder 1 form a closed liquid chamber, protecting the limit claw 202 and the moving limit sleeve 203 in the pre-injected liquid, preventing mud from entering and depositing, which may cause the failure of its mechanism. Through cooperation with the pressure-bearing mechanism 4, the ball valve 2055 can be opened and closed an unlimited number of times.

[0044] The auxiliary component 503 includes a moving pipe 5031. The outer wall of the moving pipe 5031 is provided with a control sliding sleeve 5035. The inner wall of the control sliding sleeve 5035 is clamped with the outer wall of the moving pipe 5031. The outer wall of the control sliding sleeve 5035 is slidably connected to the inner wall of the profiled sleeve 501. The outer wall of the control sliding sleeve 5035 is evenly provided with bumps 5036. There are bumps 5036 and slits on the control sliding sleeve 5035. It can drive the profiled sleeve 501 to move under a certain force value. When the force value exceeds a certain value, the bumps 5036 retract. By the position of the bumps 5036 on the profiled sleeve 501, a reverse force of a certain force value can be provided to continue driving the profiled sleeve 501 to move. The inner wall of the moving pipe 5031 is symmetrically provided with curved surface rings 5032. The outer wall of the curved surface ring 5032 is fixedly connected to the inner wall of the moving pipe 5031. The outer wall of the curved surface ring 5032 is evenly provided with connecting rods 5033. The curved surface ring 5032 has elasticity and maintains a curved surface state when not subjected to external forces. When subjected to external force extrusion, it will be close to the inner wall of the moving pipe 5031. One end of the connecting rod 5033 is fixedly connected to the outer wall of the curved surface ring 5032. The connecting rod 5033 is made of elastic material. When the curved surface ring 5032 is squeezed, the end of the connecting rod 5033 is exposed outside the moving pipe 5031. Due to the connection of the conical ring 5034, the connecting rod 5033 is in a bent state and pushes the conical ring 5034. The other end of the connecting rod 5033 is fixedly connected to a conical ring 5034. The inner wall of the conical ring 5034 is slidably connected to the outer wall of the moving pipe 5031. The outer wall of the conical ring 5034 is sleeved with the inner wall of the control sliding sleeve 5035. The outer wall of the connecting rod 5033 is slidably connected to the inner wall of the moving pipe 5031.

[0045] When the liquid pressure is relatively high, it will squeeze the inner wall of the moving pipe 5031, deforming the curved surface ring 5032, causing it to approach the inner wall of the moving pipe 5031. As a result, the connecting rod 5033 is subjected to an external force and moves outward from the moving pipe 5031. Since the connecting rod 5033 is restricted by the control sliding sleeve 5035, it can only push the conical ring 5034 forward, causing the conical ring 5034 to move towards the middle of the control sliding sleeve 5035, padding the gap between the control sliding sleeve 5035 and the outer wall of the moving pipe 5031, thereby enhancing the stiffness of the control sliding sleeve 5035, making the control sliding sleeve 5035 stuck in the profile sleeve 501, keeping the valve open, preventing the valve from closing when the liquid pressure is still relatively high, making the pressure relief threshold of the liquid pressure more accurate. The profile between the control sliding sleeve 5035 and the profile sleeve 501 can provide a force value for the opening and closing of the ball valve 2055 without limitation on the number of times.

[0046] The specific working process is as follows:

[0047] During operation, through the tight connection between the piston cylinder 1 and the pressure-bearing sleeve 3, a relatively enclosed space is formed between the piston cylinder 1, the pressure-bearing sleeve 3, and the outside of the sealing mechanism 2. By controlling the movement of the auxiliary component 503, the profile sleeve 501 can be moved, which in turn drives the floating sleeve 502 to move, and then drives the support cylinder 209 to move. When the support cylinder 209 drives the driving claw 2051 to move, the ball valve 2055 connected to the driving claw 2051, under the action of the driving claw cylindrical shaft 2053 and the pin sleeve, moves in the chute 2057, causing the ball valve 2055 to deflect, making the through hole 2056 of the ball valve 2055 communicate with and close the support cylinder 209, thereby forming the opening and closing of the ball valve 2055. The upper ball valve support 207 and the lower ball valve support 208 play a role in straightening and contact the ball valve 2055. The sealing seat 210 seals with the ball valve 2055 to achieve pressure bearing at the upper and lower ends. When the ball valve 2055 bears the upper pressure, the sealing seat 210 moves upward to seal with the ball valve 2055. When the ball valve 2055 bears the lower pressure, the sealing seat 210 still moves upward to seal with the ball valve 2055. The mechanical switch can move in the reverse direction, thereby forming the opening and closing of the ball valve 2055 without limitation on the number of times, greatly reducing the number of times of using the coiled tubing.

[0048] Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative efforts shall fall within the scope of protection of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. A locking mechanism for a formation isolation valve transmission unit, specifically comprising: The piston cylinder (1) is characterized in that: the inner wall of the piston cylinder (1) is slidably connected with a starting mechanism (5); The locking mechanism of the formation isolation valve transmission unit also includes: A sealing mechanism (2), wherein an outer wall of the sealing mechanism (2) is fixedly connected to an end of the piston cylinder (1) away from the starting mechanism (5); The sealing mechanism (2) comprises a sealing cylinder (201), the outer wall of the sealing cylinder (201) is fixedly connected to the inner wall of the piston cylinder (1), the inner wall of the sealing cylinder (201) is slidably connected to a movable limiting sleeve (203), the inner wall of the movable limiting sleeve (203) is slidably connected to a limiting claw (202), the outer wall of the limiting claw (202) is evenly provided with protrusions (204), the inner wall of the limiting claw (202) is slidably connected to a supporting cylinder (209), and the outer wall of the supporting cylinder (209) away from the end of the piston cylinder (1) is installed with a locking assembly (205).

2. The locking mechanism of the formation isolation valve transmission unit according to claim 1 is characterized in that: The outer wall of the sealing mechanism (2) at one end away from the piston cylinder (1) is fixedly connected to a pressure-bearing sleeve (3), and the inner wall of the pressure-bearing sleeve (3) at one end away from the sealing mechanism (2) is provided with a pressure-bearing mechanism (4), and the outer wall of the pressure-bearing mechanism (4) is sleeved with the inner wall of the pressure-bearing sleeve (3).

3. The locking mechanism of the formation isolation valve transmission unit according to claim 2 is characterized in that: The sealing mechanism (2) further comprises a guide sleeve (206), the outer wall of which is fixedly connected to the inner wall of the locking assembly (205); an upper ball valve support (207) is arranged at one end of the guide sleeve (206) away from the support tube (209); the outer wall of the upper ball valve support (207) is slidably connected to the inner wall of the locking assembly (205); a lower ball valve support (208) is arranged at one end of the locking assembly (205) away from the support tube (209); the inner wall of the lower ball valve support (208) is snap-fitted to the outer wall of the locking assembly (205).

4. The locking mechanism of the formation isolation valve transmission unit according to claim 3 is characterized in that: The outer wall of the lower ball valve support (208) is slidably connected to the inner wall of the pressure-bearing sleeve (3), and one end of the lower ball valve support (208) away from the locking assembly (205) is fixedly connected to the outer wall of the pressure-bearing mechanism (4). The inner wall of the lower ball valve support (208) is provided with a sealing seat (210), and the outer wall of the sealing seat (210) is sleeved with the inner wall of the lower ball valve support (208). One end of the sealing seat (210) contacts the outer wall of the locking assembly (205), and the other end of the sealing seat (210) is sleeved with the inner wall of the pressure-bearing mechanism (4).

5. The locking mechanism of the formation isolation valve transmission unit according to claim 1 is characterized in that: The starting mechanism (5) comprises a floating piston (504), the outer wall of the floating piston (504) is slidably connected to the inner wall of the piston cylinder (1), the inner wall of the floating piston (504) is slidably connected to a floating sleeve (502), an end of the floating sleeve (502) away from the sealing mechanism (2) is provided with a profile sleeve (501), one end of the profile sleeve (501) is snap-fitted to an end of the floating sleeve (502) away from the sealing mechanism (2), and the inner wall of the profile sleeve (501) is slidably connected to an auxiliary component (503).

6. The locking mechanism of the formation isolation valve transmission unit according to claim 2 is characterized in that: The pressure-bearing mechanism (4) comprises a variable buckle short section (401), the outer wall of the variable buckle short section (401) is sleeved with the inner wall of the pressure-bearing sleeve (3), the outer wall of the variable buckle short section (401) is slidably connected with a piston ring (402), one end of the piston ring (402) away from the variable buckle short section (401) is fixedly connected with a positioning spring (403), and one end of the positioning spring (403) away from the piston ring (402) is fixedly connected to the outer wall of the lower ball valve support (208).

7. The locking mechanism of the formation isolation valve transmission unit according to claim 1 is characterized in that: The locking assembly (205) includes a driving claw (2051), the inner wall of the driving claw (2051) is clamped with the outer wall of the support tube (209), the inner wall of the driving claw (2051) is sleeved with the outer wall of the upper ball valve support (207), and two driving claws (2051) are symmetrically arranged, and the driving claw cylindrical shaft (2053) is fixedly connected to the opposite side of the driving claw (2051).

8. The locking mechanism of the formation isolation valve transmission unit according to claim 7 is characterized in that: The outer wall of the cylindrical shaft (2053) of the driving claw is slidably connected to a rotating pin sleeve (2054), the inner wall of the driving claw (2051) close to the rotating pin sleeve (2054) is slidably connected to a spherical bearing (2052), the inner wall of the spherical bearing (2052) is slidably connected to a ball valve (2055), the outer wall of the ball valve (2055) is sleeved with the inner wall of the upper ball valve support (207), the inner wall of the ball valve (2055) is provided with a through hole (2056), the outer wall of the ball valve (2055) is symmetrically provided with a slide groove (2057), the outer wall of the cylindrical shaft (2053) of the driving claw is in contact with the inner wall of the slide groove (2057), the outer wall of the driving claw (2051) is provided with a positioning plate (2058), and the outer wall of the positioning plate (2058) is snap-fitted with the inner wall of the driving claw (2051).

9. The locking mechanism of the formation isolation valve transmission unit according to claim 5, characterized in that: The auxiliary component (503) comprises a moving tube (5031), the outer wall of the moving tube (5031) is provided with a control sleeve (5035), the inner wall of the control sleeve (5035) is snap-fitted with the outer wall of the moving tube (5031), the outer wall of the control sleeve (5035) is slidably connected with the inner wall of the profile sleeve (501), the outer wall of the control sleeve (5035) is evenly provided with bumps (5036), the inner wall of the moving tube (5031) is symmetrically provided with a curved surface ring (5032), the outer wall of the curved surface ring (5032) is symmetrically connected with the outer wall of the moving tube (5031), and the outer wall of the curved surface ring (5032) is symmetrically connected with the outer wall of the moving tube (5031). ), the outer wall of the curved ring (5032) is evenly provided with connecting rods (5033), one end of the connecting rod (5033) is fixedly connected to the outer wall of the curved ring (5032), the other end of the connecting rod (5033) is fixedly connected to a conical ring (5034), the inner wall of the conical ring (5034) is slidably connected to the outer wall of the moving tube (5031), the outer wall of the conical ring (5034) is sleeved with the inner wall of the control sleeve (5035), and the outer wall of the connecting rod (5033) is slidably connected to the inner wall of the moving tube (5031).

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