Recyclable driving drilling liner hanger

Abstract

The invention relates to a recoverable driving drilling liner hanger which comprises a tubular mandrel and a body, a fluid circulation channel is arranged in the mandrel, and slips are arranged on the outer wall of the body. A first driving assembly capable of driving the slips to move downwards is arranged on the outer wall of the mandrel; a supporting rod which is arranged on the outer wall of the locking device and connected with the slips through a hinge can prop the slips open when the slips move downwards. And the locking device is connected with the supporting sleeve through inverted teeth. And finally, the slip is fixed and opened to finish hanging. And a thrust device for supporting the locking device and a pressing sleeve capable of pressing the thrust device are arranged at the upper part of the locking device. And a second driving assembly capable of driving the pressing sleeve to move downwards is arranged on the outer wall of the mandrel. The second driving assembly pushes the pressing sleeve to further push the thrust device to move downwards, and when the thrust device moves downwards to a certain position, unlocking of the thrust device and the locking device is achieved, so that the mandrel can be separated from the body after hanging is completed.

Description

Technical Field

[0001] The invention relates to a recoverable driven tail pipe hanger, belonging to the technical field of oil and natural gas mining drilling tools. Background Art

[0002] Liner hanger is a commonly used downhole tool in oil exploration and development. It can be divided into three types according to the different hanging methods: mechanical, hydraulic and hydraulic-mechanical double-acting. Hydraulic liner hanger is the most widely used.

[0003] The hydraulic liner hanger activates the hydraulic cylinder through the accumulation of pressure in the pipe, and then drives the suspension mechanism to achieve hanging. The hydraulic cylinder of the traditional hydraulic liner hanger is designed to be outside the hanger body. After the cementing construction is completed, the hydraulic cylinder will remain in the well for a long time. Since the hydraulic cylinder of this hydraulic liner hanger usually needs to use rubber seals, the rubber seals of the hydraulic cylinder are prone to aging under the high temperature and high pressure environment in the well for a long time, which will cause the seal of the hydraulic drive mechanism to fail, the hydraulic cylinder retreats under the action of pressure, and the slips cannot be maintained, thus affecting the durability of the seal of the entire wellbore. Summary of the invention

[0004] To solve this problem, a retrievable drive liner hanger is designed with a retrievable drive mechanism. The retrievable drive liner hanger transfers the sitting drive mechanism to the running tool and is recovered with the running tool after cementing. This avoids the rubber parts staying underground for a long time. This improves the tool's ability to withstand high temperature and high pressure and the durability of the seal.

[0005] According to the present invention, a retrievable driven tail pipe hanger is provided, comprising a tubular mandrel and a body, wherein the mandrel has a channel for fluid circulation, and a slip is arranged on the outer wall of the body. A first driving assembly capable of driving the slip to move downward is arranged on the outer wall of the mandrel; a support rod connected to the slip by a hinge arranged on the outer wall of the locking device can prop up the slip when the slip moves downward. The locking device is connected to the supporting sleeve by inverted teeth. Finally, the slip is fixed and opened to complete the hanging. A thrust device supporting the locking device and a pressing sleeve capable of pressing the thrust device downward are arranged on the upper part of the locking device. A second driving assembly capable of driving the pressing sleeve to move downward is arranged on the outer wall of the mandrel. The second driving assembly pushes the pressing sleeve and then pushes the thrust device to move downward. When the thrust device reaches a certain position downward, the thrust device and the locking device are unlocked, so that the mandrel can be detached from the body after the hanging is completed.

[0006] In a preferred embodiment, the first drive assembly is arranged at the lower side of the body. A first hydraulic cylinder connected to the channel is arranged outside the core shaft, and the first hydraulic cylinder can move downward under the action of the fluid pressure in the channel. The first hydraulic cylinder drives the pull-down sleeve downward to move downward.

[0007] In a preferred embodiment, the first hydraulic cylinder includes a first gap formed between the first cylinder body on the outer wall of the core shaft and the core shaft to connect to the channel, an opening at the upper end of the first gap, and a first piston on the outer wall of the core shaft, a part of the first piston is in the opening, so that the first gap is formed to change the first liquid chamber mentioned by itself, and the first cylinder body can move downward relative to the first piston under the action of the fluid pressure in the first liquid chamber.

[0008] In a preferred embodiment, the first piston and the first cylinder are connected by a first shear pin, and a limiting step is provided between the first piston and the first cylinder to prevent the two from separating. The lower part of the first hydraulic cylinder is provided with a step protruding outward, and the inner side of the pull-down sleeve is provided with a step matching the step. The first hydraulic cylinder can drive the pull-down sleeve to move downward without hindering the first hydraulic cylinder from moving upward. The pull-down sleeve has a thread that is fixedly connected to the body.

[0009] In a preferred embodiment, one end of the support rod connected to the locking device by a first hinge is fixed, and the other end of the support rod connected to the slip by a second hinge moves downward. The support rod rotates around the first hinge, and the angle between the slip and the axis of the mandrel increases, completing the hanging. The locking device is connected to the support sleeve, so that the locking device cannot move downward relative to the body after being unlocked, thereby fixing the slip to open.

[0010] In a preferred embodiment, the inner side of the lower part of the locking device is provided with inverted teeth matching with the supporting sleeve. The supporting sleeve has a thread that is fixedly connected with the inner side of the body.

[0011] In a preferred embodiment, the outer side of the mandrel is provided with a support sleeve fixedly connected by a thread. A spring and a thrust device are respectively arranged on the upper part of the support sleeve. The thrust device has a serrated groove of the thrust device that matches with the locking device. The locking device presses down the thrust device spring and the support sleeve through the matching hook-shaped groove to complete the locking.

[0012] In a preferred embodiment, the second drive assembly is arranged on the upper side of the pressing sleeve.

[0013] In a preferred embodiment, the second hydraulic cylinder includes a second cylinder body sleeved on the outer wall of the mandrel, a second gap communicating with the passage is formed between the second cylinder body and the mandrel, an opening is provided at the upper end of the second gap, and a second piston is provided on the outer wall of the mandrel, a part of the second piston is in the opening, so that the second gap is formed into a second liquid cavity which changes itself, and the second cylinder body can move downward relative to the second piston under the action of the fluid pressure in the second liquid cavity. The second piston and the second cylinder body are connected by a second shear pin, and a limiting step is provided between the second piston and the second cylinder body to prevent the two from separating.

[0014] In a preferred embodiment, the pressing sleeve is on the inner side of the locking device, the pressing sleeve has a protruding extrusion surface on the outer side, and a serrated groove of the pressing sleeve on the bottom.

[0015] In a preferred embodiment, the locking device has a hook-shaped groove on the upper part, and an external passage directly reaching the top of the locking device is provided beside the hook-shaped groove. The locking device has a groove inside that matches the protruding extrusion surface on the outer side of the pressing sleeve.

[0016] In a preferred embodiment, the thrust device is located inside the locking device, below the pressing sleeve.

[0017] In a preferred embodiment, the second hydraulic cylinder drives the pressing sleeve downward, and the serrated groove of the pressing sleeve is semi-contacted with the serrated groove of the thrust device, and the inclined surface of the serrated groove of the pressing sleeve generates a force that causes the thrust device to move circumferentially. The protruding extrusion surface of the pressing sleeve cooperates with the groove of the locking device, so that the pressing sleeve cannot rotate relative to the locking device. When the thrust device is separated from the hook-shaped groove of the locking device downward, the thrust device rotates and is no longer connected to the locking device, and the thrust device can leave from the external passage next to it after leaving the hook-shaped groove.

[0018] In a preferred embodiment, a lifting joint is provided at the upper end of the mandrel, and the joint is designed to be connected to the upper pipe column. A rubber plug joint is provided at the lower end of the body, and both ends of the lifting joint and the rubber plug joint are respectively provided with reducing joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a retrievably driven liner hanger according to one embodiment of the present invention is shown.

[0020] Figure 2 for Figure 1 The diagram shows the connection between the first drive assembly and the pull-down sleeve of the retrievable driven tail pipe hanger.

[0021] Figure 3 for Figure 1 A schematic diagram of the connection of a locking device, a thrust device, a pressing sleeve, a second driving device and a supporting sleeve of a recoverable driven tail pipe hanger is shown.

[0022] Figure 4 for Figure 1 A schematic diagram of the locking device of the retrievable drive liner hanger when locked is shown.

[0023] Figure 5 for Figure 1 A schematic diagram of the retrievable drive liner hanger when the locking device is unlocked is shown.

[0024] 1- spindle, 10- channel, 11- slip, 12 support sleeve, 13 spring, 14 body, 15 first pressure transmission hole, 16 second pressure transmission hole, 2- first drive device, 20- first hydraulic cylinder, 21- first gap, 22- first piston, 23- first liquid chamber, 24- first shear pin, 25- first cylinder body, 26- pull-down sleeve, 27- upper step, 28- lower step, 30- locking device, 31- first hinge, 32- support rod, 33- second hinge, 34- inverted tooth, 35-hook groove, 36-external passage, 37-groove, 40-support sleeve, 50-thrust device, 51-serrated groove of thrust device, 60-pressing sleeve, 61-protruding extrusion surface, 62-serrated groove of pressing sleeve, 63-inclined surface, 7-first driving device, 70-first hydraulic cylinder, 71-first gap, 72-first piston, 73-first liquid chamber, 74-first shear pin, 75-first cylinder body, 80-lifting joint, 82-rubber plug joint, 85-reducing joint. DETAILED DESCRIPTION

[0025] The present invention is described below with reference to the accompanying drawings. In this article, the "upper end" or similar terms refer to the end close to the wellhead; the "lower end" or similar terms refer to the end away from the wellhead.

[0026] Figure 1 FIG. 1 is a schematic diagram of a retrievable drive liner hanger 100 according to an embodiment of the present invention. Figure 1 As shown, the retrievable driven liner hanger 100 comprises a body 14 placed in a wellbore (not shown), and a mandrel 1. The body 14 is configured as a circular tube, and a fluid flow channel 10 is provided in the mandrel. Slips 11 are provided on the outer wall of the body 14, and a support rod 32 is connected to the inner side of the slips 11.

[0027] At the same time, a pull-down sleeve 26 is provided at the lower end of the body 14. The pull-down sleeve 26 can apply a downward force to the body 14 under the action of an external force, thereby driving the body 14 to move downward, so that the angle between the support rod 32 and the core shaft 1 increases and supports the slips 14 to open, until the slips 14 abut against the inner wall of the wellbore to complete the hanging.

[0028] like Figure 1 As shown, there is a first drive assembly 2 connected with a step under the pull-down sleeve 26. The first drive assembly 2 can move downward relative to the pull-down sleeve 26 under the action of the fluid pressure in the channel 10, thereby pushing the pull-down sleeve 26 to move downward.

[0029] Figure 2 for Figure 1 The schematic diagram of the connection between the first drive assembly 2 and the pull-down sleeve 26 of the retrievable driven tail pipe hanger 100 is shown. Figure 2 As shown, there is a passage 10 for fluid flow in the core shaft 1. A ball seat (not shown) that can be set by a sealing ball (not shown) is arranged in the passage 10.

[0030] like Figure 2 As shown, the first drive assembly 2 also includes a first hydraulic cylinder 20 arranged on the outer wall of the mandrel 1. The first hydraulic cylinder 20 includes a first cylinder body 25 sleeved on the outer wall of the mandrel 1. A first gap 21 is formed between the first cylinder body 25 and the radial direction of the mandrel 1, and the upper end of the first gap 21 has an opening (not shown). At the same time, the first hydraulic cylinder 25 also includes a first piston 22 fixed on the outer wall of the mandrel 1. The lower end of the first piston 22 extends into and closes the opening, so that the first gap 21 is formed into a closed first liquid chamber 23. A first pressure transmission hole 15 connecting the first liquid chamber 23 and the channel 10 is provided on the outer wall of the mandrel 1. Therefore, after the ball seat seals the channel 10, the high-pressure fluid in the channel 10 located upstream of the ball seat can flow into the first liquid chamber 23 through the first pressure transmission hole 15. At this time, since the first piston 22 is fixed, under the action of the fluid pressure in the first liquid chamber 23, the first cylinder body 25 will move downward relative to the mandrel 1, thereby generating a power to push the pull-down sleeve 26 to move downward.

[0031] In a preferred embodiment, a first shear pin 24 is additionally provided between the first piston 22 and the first cylinder 25. This design ensures that the first piston 22 and the first cylinder 25 are firmly connected via the first shear pin 24. Obviously, by means of the provision of the first shear pin 24, the first cylinder 25 can be effectively prevented from being displaced in advance relative to the first piston 22 due to external factors such as vibration during downhole operations.

[0032] Figure 3 for Figure 1 The schematic diagram of the connection of the locking device 30, the thrust device 50, the pressing sleeve 60, the second driving device 7 and the supporting sleeve 40 of the retrievable driven tail pipe hanger 100 is shown. Figure 3 The support sleeve 40 and the locking device 30 shown have teeth that match each other, and the support sleeve 40 is connected to the body 14 by threads. As the first cylinder 25 squeezes and pulls down the sleeve to drive the body to move downward, the support sleeve 40 moves downward relative to the locking device 30, and the support sleeve 40 and the locking device 30 are staggered. Under the restriction of the support sleeve 40, the relative distance between the locking device 30 and the body 14 will remain unchanged. The angle between the support rod 32 and the mandrel 1 between the locking device 30 and the slip 11 will remain unchanged, thereby preventing the slip 14 from retracting during the long-term use of the liner hanger and causing the entire liner hanger to fail.

[0033] like Figure 3 As shown, in a preferred embodiment, the outer wall of the mandrel 1 is provided with a threaded support sleeve 12. The upper part of the support sleeve 12 is provided with a spring 13 and a thrust device 50. The thrust device 50 has a serrated groove 51 of the thrust device that matches the locking device 30. The locking device 30 presses down the thrust device spring 13 and the support sleeve 12 through the matching hook-shaped groove 35 to complete the locking.

[0034] like Figure 3 As shown, the second drive assembly 7 also includes a second hydraulic cylinder 70 arranged on the outer wall of the mandrel 1. The second hydraulic cylinder 70 includes a second cylinder body 75 sleeved on the outer wall of the mandrel 1. A second gap 71 is formed between the second cylinder body 75 and the radial direction of the mandrel 1, and the upper end of the second gap 71 has an opening (not shown). At the same time, the second hydraulic cylinder 75 also includes a second piston 72 fixed on the outer wall of the mandrel 1. The lower end of the second piston 72 extends into and closes the opening, so that the second gap 71 is formed into a closed second liquid cavity 73. A second pressure transmission hole 16 connecting the second liquid cavity 73 and the channel 10 is provided on the outer wall of the mandrel 1. At this time, since the second piston 72 is fixed, under the action of the fluid pressure in the second liquid cavity 73, the second cylinder body 75 will move downward relative to the mandrel 1, thereby generating power to push the downward pressure sleeve 60 to move downward.

[0035] In a preferred embodiment, a second shear pin 74 is additionally provided between the second piston 72 and the second cylinder 75. This design ensures that the second piston 72 and the second cylinder 75 are firmly connected via the second shear pin 74. Obviously, by means of the second shear pin 74, the second cylinder 75 can be effectively prevented from being displaced in advance relative to the second piston 72 due to external factors such as vibration during downhole operations.

[0036] like Figure 3 As shown, the serrated groove 62 of the pressing sleeve is semi-contacted with the serrated groove 51 of the thrust device, and the serrated groove 51 of the thrust device is matched with the hook-shaped groove 35 of the locking device at the same time. The protruding extrusion surface 61 of the pressing sleeve 60 is matched with the groove 37 of the inner wall of the locking device 30. The pressing sleeve 60 moves downward under the pressure of the second driving device 7, and after the protruding extrusion surface 61 of the pressing sleeve 60 is matched with the groove 37 of the inner wall of the locking device 30, the pressing sleeve cannot move circumferentially relative to the locking device 30. At the same time, the serrated groove 51 of the thrust device is matched with the hook-shaped groove 35 of the locking device at the same time, so that the thrust device 50 cannot move circumferentially relative to the locking device 30 in the hook-shaped groove 35. When the pressing sleeve 60 presses down the thrust device 50 and the thrust device 50 has not yet withdrawn from the hook-shaped groove 35, the pressing sleeve 60 and the thrust device 50 remain fixed in the circumferential direction. Because the serrated groove 62 of the pressing sleeve is in a semi-contact state with the serrated groove 51 of the thrust device, the inclined surface 63 of the serrated groove of the pressing sleeve will generate a circumferential component force on the inclined surface that cooperates with the thrust device 50. Therefore, when the pressing sleeve 60 continues to press down, the thrust device 50 leaves the hook-shaped groove 35, and the pressing sleeve 60 and the thrust device 50 are no longer fixed in the circumferential direction. The thrust device 50 will produce circumferential movement under the circumferential component force applied by the pressing sleeve 60, and the serrated groove of the thrust device enters the external passage 36 of the locking device 30 and no longer cooperates with the hook-shaped groove 35 of the locking device 30, and the thrust device 50 is unlocked from the locking device.

[0037] When the pressure rises to a certain level, the ball seat is sheared off, and the pressure in the channel 10 decreases. The spring 13 under the thrust device 50 stretches, pushing the thrust device 50 and the pressing sleeve 60 out along the external passage 36, completing the unlocking of the locking device 30 and the spindle 1.

[0038] In addition to the foregoing, if Figure 1 As shown, the upper end of the mandrel 1 is provided with a lifting joint 80, which is designed to be connected to an upper pipe column (not shown). At the same time, a rubber plug joint 82 is configured at the lower end of the body 14, which is used to establish a connection with a tail pipe rubber plug (not shown). Both ends of the lifting joint 80 and the rubber plug joint 82 are respectively equipped with reducing joints 85.

[0039] The working process of the retrievable driven liner hanger 100 according to the present invention is briefly described below.

[0040] The retrievable driven tail pipe hanger 100 of the present invention is used for the tail pipe seating operation. When the tail pipe seating operation is required, the operator first needs to connect the retrievable driven tail pipe hanger 100 to the tail pipe and lower it into the well together with the tail pipe. When the tail pipe reaches the specified position, the ball can be dropped into the well to seal the channel 10. Then, high-pressure fluid is injected into the channel 10, and the high-pressure fluid will enter the first liquid chamber 23 from the first pressure transmission hole 15. Then, under the action of the high-pressure fluid entering the first liquid chamber 23, the first cylinder body 26 will move downward relative to the core shaft 1, thereby driving the main body 14 to move downward. As the main body moves downward, the support rod 32 will open the cava 11 to complete the seating. At this time, the locking device 30 is fixed to the main body with a support sleeve 40. The pressure is continuously increased, and the high-pressure fluid in the second liquid chamber 73 drives the second cylinder 76 to press down the sleeve 60 and the thrust device 50 out of the locking device 30. Finally, when the pressure shears off the ball seat, the pressure reduction spring in the rear channel separates the locking device 30 from the thrust device 50. Then, the mandrel 1 is lifted up, and only the body 14, the locking device 30 and the supporting sleeve 40 remain in the well.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A retrievable driven tail pipe hanger, the structure of which comprises: A tubular mandrel 1 and a body 14 are provided in the mandrel 1. A fluid flow channel 15 is provided in the mandrel 1. A slip 11 is provided on the outer wall of the body. A first driving assembly 2 capable of driving the slip 11 to move downward is provided on the outer wall of the mandrel 1. A support rod 32 connected to the slip 11 by a hinge is provided on the outer wall of the locking device 30, which can prop up the slip 11 when the slip 11 moves downward. The support sleeve is threadedly connected to the body 14. The locking device 30 is connected to the support sleeve 40 by inverted teeth to ensure that the locking device 30 remains stationary after the slip 11 is opened, and finally the slip 11 is fixedly opened to complete the hanging. A thrust supporting the locking device 30 is provided on the upper part of the locking device 30. The outer wall of the core shaft 1 is provided with a second driving assembly 7 which can drive the pressing sleeve 60 to move downward, and the second driving assembly 7 pushes the pressing sleeve 60 and then pushes the thrust device 50 to move downward, and the serrated groove 62 of the pressing sleeve is semi-contacted and connected with the serrated groove 51 of the thrust device, and the serrated groove inclined surface 63 of the pressing sleeve will generate a force to make the thrust device 50 move circumferentially, and when the thrust device 50 is separated from the hook groove 35 of the locking device downward, the thrust device 50 rotates and is no longer connected to the locking device 30, and the ball seat is unlocked by the shear flow channel pressure drop locking device 30 and the thrust device.

2. A retrievable driven liner hanger according to claim 1, characterized in that: The first drive assembly 2 is arranged on the lower side of the main body 14, and a ball seat that can be sealed is provided in the core shaft 1. A first hydraulic cylinder 20 connected to the channel is provided on the outer side of the core shaft 1. The first hydraulic cylinder 20 can move downward under the action of the fluid pressure in the channel, and the hydraulic cylinder 20 drives the pull-down sleeve 26 downward to move downward.

3. A retrievable driven liner hanger according to claim 2, characterized in that: The first hydraulic cylinder 20 includes a first gap 21 formed between the first cylinder body 25 on the outer wall of the core shaft and the core shaft 1 to connect the channel 10, an opening at the upper end of the first gap 21, and a first piston 22 on the outer wall of the core shaft 1, a part of the opening of the first piston 22, so that the first gap 21 is formed into a first liquid chamber 23 mentioned by itself, the first cylinder body 25 can move downward relative to the first piston 22 under the action of the fluid pressure in the first liquid chamber, the first piston 22 and the first cylinder body 25 are connected by a first shear pin 24, and a limiting step is provided between the first piston 22 and the first cylinder body 25 to prevent the two from separating, the first hydraulic cylinder 20 is provided with an upper step 27 protruding outward at the lower part, and a step 28 matching it is provided on the inner side of the pull-down sleeve 26, so that the first hydraulic cylinder 20 can drive the pull-down sleeve 26 to move downward without hindering the first hydraulic cylinder 20 from moving upward, and the pull-down sleeve 26 has a thread that is fixedly connected to the body 14.

4. The retrievable driven liner hanger according to claim 1, characterized in that: One end of the support rod 32 connected to the locking device 30 by the first hinge 31 is fixed, and the other end of the support rod 32 connected to the cava 11 by the second hinge 33 moves downward. The support rod 32 rotates around the first hinge 31, and the angle between the cava 11 and the axis of the core shaft 1 increases, completing the hanging. The locking device 30 is connected to the support sleeve 40, so that the locking device 30 cannot move downward relative to the main body 14 after being unlocked, thereby fixing the cava 11 to open.

5. A retrievable driven liner hanger according to claim 4, characterized in that: The inner side of the lower part of the locking device 30 is provided with inverted teeth 34 matching with the support sleeve 40, the support sleeve has a thread that forms a fixed connection with the inner side of the body, the outer side of the core shaft 1 is provided with a support sleeve 12 that forms a fixed connection with the thread, and the upper part of the support sleeve 12 is respectively provided with a spring 13 and a thrust device 50. The thrust device 50 has a serrated groove 51 of the thrust device that matches with the locking device 30. The locking device 30 presses down the thrust device spring 13 and the support sleeve 12 through the matching hook-shaped groove 35 to complete the locking.

6. The retrievable driven liner hanger according to claim 1, characterized in that: The second hydraulic cylinder 70 includes a cylinder body 75 sleeved on the outer wall of the core shaft 1, and a second gap 71 connecting the channel is formed between the cylinder body 75 and the core shaft 1, an opening is provided at the upper end of the second gap 71, and a piston 72 is provided on the outer wall of the core shaft 1, a part of the piston 72 is in the opening, so that the second gap 71 is formed to change the second liquid chamber 73 mentioned by itself, and the second cylinder body 75 can move downward relative to the second piston 72 under the action of the fluid pressure in the second liquid chamber 73, the second piston 72 and the second cylinder body 75 are connected by a second shear pin 74, and a limiting step is provided between the second piston 72 and the second cylinder body 75 to prevent the two from separating.

7. The retrievable driven liner hanger according to claim 1, characterized in that: The pressing sleeve 60 is on the inner side of the locking device 30, and has a protruding extrusion surface 61 on the outer side of the pressing sleeve 60, and a serrated groove 62 of the pressing device on the bottom. The locking device 30 has a hook-shaped groove 35 on the upper part, and an external passage 36 next to the hook-shaped groove 35 that directly reaches the top of the locking device 30. The locking device 30 has a groove 37 inside that cooperates with the protruding extrusion surface 61 on the outer side of the pressing sleeve 60. The thrust device 50 is located on the inner side of the locking device 30, below the pressing sleeve.

8. The retrievable driven liner hanger according to claim 7, characterized in that: The second hydraulic cylinder 70 drives the pressing sleeve 60 downward, and the serrated groove 62 of the pressing sleeve is semi-contacted with the serrated groove 51 of the thrust device. The serrated groove inclined surface 63 of the pressing sleeve generates a force to make the thrust device 50 move circumferentially. The protruding extrusion surface 61 of the pressing sleeve 60 cooperates with the groove 37 of the locking device, so that the pressing sleeve 60 cannot rotate relative to the locking device 30. When the thrust device 50 is separated from the hook-shaped groove 35 of the locking device downward, the thrust device 50 rotates and is no longer connected to the locking device 30. After leaving the hook-shaped groove 35, the thrust device 50 can leave from the external passage 36 next to it.

9. The retrievable driven liner hanger according to claim 1, characterized in that: A lifting joint 80 is also provided at the upper end of the core shaft 1, and the joint is designed to be connected to the upper pipe column. A rubber plug joint 82 is also provided at the lower end of the body 14, and reducers 85 are also provided at both ends of the lifting joint 80 and the rubber plug joint 82.

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