A plunger gas lift retainer and matching fishing tool

Abstract

This invention discloses a plunger gas lift locking device and a matching retrieval tool, relating to the field of oil and gas field development equipment. It includes a retrieval connection assembly, a buffer rod, and a locking assembly. The retrieval connection assembly includes a hollow fixed head, with a retrieval connection rod slidably mounted at the axis of the fixed head. The top end of the retrieval connection rod extends out of the fixed head, and the bottom end of the fixed head is coaxially and fixedly connected to the buffer rod. The buffer rod is hollow, with a transmission rod slidably mounted at its axis, and the top end of the transmission rod is connected to the bottom end of the retrieval connection rod. The locking device of this invention changes the locking method from the passive type of existing technology to an active type. By controlling the retrieval connection assembly, the locking device can lock or release itself. When used with the matching retrieval tool, it can lock the tubing at a designated location in highly deviated and horizontal wells. After locking, the matching retrieval tool can also smoothly detach from the locking device, reducing the risk of the retrieval device pulling the locking device out.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development equipment, specifically to a plunger gas lift locking device and its matching launching and retrieving tools. Background Technology

[0002] Plunger lift, a gas well drainage and gas production technology, is widely used in major oil and gas fields. The plunger lift process involves placing a plunger in the gas well tubing. The well's own energy propels the plunger to reciprocate within the tubing, achieving periodic fluid lifting. The plunger, acting as a mechanical interface, effectively prevents gas from escaping and fluid from slipping, thus improving lift efficiency.

[0003] Before deploying the plunger, a locking device must be lowered into the tubing using a wire rope. Currently, the main types of downhole locking devices used are slip-type and coupling-type. Conventional slip-type devices require a high degree of cleanliness of the tubing inner wall; otherwise, they are prone to setting midway and cannot be lowered to the designed depth. Coupling-type devices have the risk of unstable setting and upward movement under excessive fluid impact.

[0004] In existing technologies, the deployment of locking devices typically involves using a wireline tool connected to a JDC (Jet Controlled Deployment) tool. However, this method requires downward impact to disengage the shear pin. In wells with inclination angles exceeding 40 degrees, and in horizontal wells, both slip-type and coupling-type locking devices risk failing to disengage the shear pin during impact. This prevents the locking device from reaching the desired depth in the inclination section, resulting in poor plunger drainage. Furthermore, retrieving the wireline tool before the shear pin is disengaged can pull the locking device back out of the tubing, leading to a low success rate. Additionally, because the slip-type locking device in existing technologies relies on downward impact to deploy the slips, the device's relative position to the tubing can shift before the slips are fully engaged, causing it to deviate from its designed position and resulting in a low success rate for plunger gas lift operations. Summary of the Invention

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a slip-type plunger gas lift locking device and matching deployment and retrieval tools that can be successfully deployed and retrieved in highly deviated wells and horizontal wells.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] A plunger gas lift locking device is provided, which includes a casting and retrieval connection assembly, a buffer rod, and a locking assembly;

[0008] The casting and retrieval connection assembly includes a hollow fixed head, with a casting and retrieval connection rod slidably mounted on the axis of the fixed head; the top end of the casting and retrieval connection rod extends out of the fixed head, and the bottom end of the fixed head is coaxially and fixedly connected to a buffer rod; the buffer rod has a hollow structure, with a transmission rod slidably mounted on the axis of the buffer rod, the top end of the transmission rod being connected to the bottom end of the casting and retrieval connection rod; the bottom end of the transmission rod is connected to a locking assembly.

[0009] When the fishing connecting rod drives the transmission rod to rise, the locking component locks in place; when the fishing connecting rod drives the transmission rod to fall, the locking component releases the lock.

[0010] Furthermore, the locking assembly includes a housing, the top of which is connected to a buffer rod; two locking plates are symmetrically arranged on the housing, both of which are slidably engaged with the housing; a ramp is fixedly connected to the bottom end of the transmission rod, the top of which is fixedly connected to the transmission rod, and the width of the top of the ramp is smaller than the width of the bottom of the ramp; the two locking plates are respectively in contact with the inclined surfaces on both sides of the ramp on the inside of the housing; and the locking plates are slidably engaged with the ramp.

[0011] A rubber bucket is also fitted onto the shell, and the rubber bucket is located at the bottom of the clasp.

[0012] Furthermore, a buffer cylinder is provided at the top of the housing, and a buffer rod is slidably engaged with the buffer cylinder. A protrusion is provided at the bottom of the buffer rod, and a groove is provided on the inner wall of the buffer cylinder for the protrusion to move along the length of the buffer rod. A buffer spring is sleeved on the buffer rod, with the top of the buffer spring abutting against the fixed head and the bottom of the buffer spring abutting against the buffer cylinder. A one-way valve is also provided at the lower end of the housing.

[0013] Furthermore, a sliding cavity is provided at the top of the transmission rod along its length; a piston is provided inside the sliding cavity, and the piston slides in the sliding cavity along its length. The bottom end of the casting and retrieval connecting rod extends into the sliding cavity and is fixedly connected to the piston, and the casting and retrieval connecting rod is in sliding engagement with the transmission rod.

[0014] The piston design allows the transmission method of the telescopic rod directly contacting the target to be changed to hydraulic or pneumatic transmission when releasing the locking mechanism. This reduces the structural performance requirements of the transmission rod and the casting / retrieval connecting rod while still fulfilling the work requirements, thereby lowering costs.

[0015] Furthermore, the upper end of the fixing head is provided with a first retaining ring, and the top of the first retaining ring is provided with a hollow frustum, the diameter of the top of the hollow frustum being smaller than the diameter of the bottom of the hollow frustum.

[0016] A matching retrieval tool for retrieving the aforementioned plunger gas lift locking device is provided, including a retrieval housing, a connecting buckle for connecting to a wire rope tool is provided at the top of the retrieval housing, a retrieval assembly for connecting to a fixing head and a retrieval connecting rod is provided at the bottom of the retrieval housing, and a torque motor for driving the retrieval assembly and a high-temperature battery for powering the torque motor and the retrieval assembly are provided inside the retrieval housing.

[0017] Furthermore, the retrieval assembly includes a retrieval component, which includes several first retrieval claws and a telescopic rod; the several first retrieval claws are evenly spaced along the axis of the retrieval housing; a torque motor drives the several first retrieval claws to retract towards the center; the bottom end of the first retrieval claw is provided with a hook that engages with the fixed head; the telescopic rod is located inside the retrieval housing, and the bottom end of the telescopic rod extends out of the retrieval housing and abuts against the top end of the retrieval connecting rod.

[0018] Furthermore, the retrieval assembly includes a deployment component, which comprises several second retrieval claws and a gripping component for fixing the retrieval connecting rod; the several second retrieval claws are evenly spaced along the axis of the retrieval housing; the bottom end of each second retrieval claw is provided with a hook that engages with the fixing head, and the top of each second retrieval claw is provided with an electric push rod; a torque motor drives the several electric push rods to retract towards the center; a stop block is provided on the side of each second retrieval claw near the axis of the retrieval housing, and the stop block abuts against the top of the fixing head.

[0019] The gripping assembly fixes the throwing connecting rod, so that when the second throwing claw pushes down against the fixed head, the throwing connecting rod and the fixed head will be relatively displaced, which will cause the transmission rod to move upward relative to the fixed head, so that the inclined platform can smoothly push the slip outward and realize the locking of the locking device.

[0020] Furthermore, the gripping assembly includes several gripping claws, which are evenly spaced along the axis of the retrieval shell; and the gripping claws are spaced apart from the second retrieval claw; the torque motor drives the gripping claws to retract towards the center.

[0021] Furthermore, the gripping component includes a rotating rod, which is driven to rotate along the axis by a torque motor; the bottom end of the rotating rod is provided with a threaded hole, and the top end of the fishing connecting rod is provided with a thread that engages with the threaded hole; a limiting structure is also provided to restrict the rotation of the fishing connecting rod along the axis, the limiting structure includes a limiting block provided on the fixed head, and a limiting groove provided on the fishing connecting rod along the length direction for the limiting block to slide.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. The locking device of the present invention changes the locking method from the passive type of the prior art to an active type. By controlling the fishing and retrieval connection components, the locking device can lock or release itself. When used with the matching fishing and retrieval tool, it can lock the tubing at a designated location in highly deviated wells and horizontal wells. After locking, the matching fishing and retrieval tool can also be smoothly disengaged from the locking device, reducing the risk of the fishing and retrieval device taking the locking device out.

[0024] 2. By setting up the rubber bucket and the one-way valve, the locking of the locking device in the high-angle section is achieved and the liquid is kept in the upper part of the locking device, which improves the liquid carrying efficiency of the plunger. It can effectively solve the problem of the liquid falling back to the horizontal section during the operation of the plunger in the high-angle well, resulting in no liquid in the upper part of the locking device and the plunger running empty. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of Example 1;

[0026] Figure 2 This is a schematic diagram of the internal structure of Example 2;

[0027] Figure 3 This is a schematic diagram of the internal structure of Example 3;

[0028] Figure 4 This is a bottom view of a partial three-dimensional structure of Example 4;

[0029] Figure 5 This is a schematic diagram of the internal structure of Example 5;

[0030] Figure 6 This is a bottom view of a partial three-dimensional structure of Example 6;

[0031] Figure 7 This is a bottom view of a partial three-dimensional structure of Example 7.

[0032] Among them, 11, fixed head; 111, first retaining ring; 112, hollow truncated cone; 12, casting and retrieval connecting rod; 122, thread; 13, transmission rod; 131, inclined platform; 132, sliding cavity; 133, piston; 2, buffer rod; 21, protrusion; 31, shell; 32, slip; 33, glue bucket; 34, buffer cylinder; 35, sliding groove; 36, buffer spring; 37, one-way valve; 41, casting and retrieval shell; 42, connecting buckle; 43, high temperature battery; 51, first casting and retrieval claw; 52, telescopic rod; 61, second casting and retrieval claw; 62, electric push rod; 63, stop block; 64, gripping claw; 65, rotating rod; 651, threaded hole; 66, torque motor; 67, gear plate. Detailed Implementation

[0033] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0034] Example 1

[0035] like Figure 1As shown, a plunger gas lift locking device includes a casting and retrieval connection assembly, a buffer rod 2, and a locking assembly;

[0036] The casting and retrieval connection assembly includes a hollow fixed head 11, with a casting and retrieval connection rod 12 slidably mounted on the axis of the fixed head 11; the top end of the casting and retrieval connection rod 12 extends out of the fixed head 11, and the bottom end of the fixed head 11 is coaxially and fixedly connected to the buffer rod 2; the buffer rod 2 has a hollow structure, with a transmission rod 13 slidably mounted on the axis of the buffer rod 2, the top end of the transmission rod 13 being connected to the bottom end of the casting and retrieval connection rod 12; the bottom end of the transmission rod 13 is connected to the locking assembly;

[0037] When the fishing connecting rod 12 drives the transmission rod 13 to rise, the locking component locks in place; when the fishing connecting rod 12 drives the transmission rod 13 to fall, the locking component releases the lock.

[0038] The locking assembly includes a housing 31, the top of which is connected to the buffer rod 2; two locking plates 32 are symmetrically arranged on the housing 31, and both locking plates 32 are slidably engaged with the housing 31; a ramp 131 is fixedly connected to the bottom end of the transmission rod 13, the top end of the ramp 131 is fixedly connected to the transmission rod 13, and the width of the top end of the ramp 131 is smaller than the width of the bottom end of the ramp 131; the two locking plates 32 are respectively attached to the inclined surfaces on both sides of the ramp 131 on the side closest to the inside of the housing 31; and the locking plates 32 are slidably engaged with the ramp 131;

[0039] A glue bucket 33 is also fitted onto the housing 31, and the glue bucket 33 is located at the bottom of the clasp 32.

[0040] A buffer cylinder 34 is provided at the top of the housing 31. The buffer rod 2 is slidably engaged with the buffer cylinder 34. A protrusion 21 is provided at the bottom of the buffer rod 2. A groove 35 is provided on the inner wall of the buffer cylinder 34 for the protrusion 21 to move along the length of the buffer rod 2. A buffer spring 36 is sleeved on the buffer rod 2. The top of the buffer spring 36 abuts against the fixed head 11, and the bottom of the buffer spring 36 abuts against the buffer cylinder 34. A one-way valve 37 is also provided at the lower end of the housing 31.

[0041] The top end of the transmission rod 13 is provided with a sliding cavity 132 along the length direction; a piston 133 is provided in the sliding cavity 132, and the piston 133 slides in the sliding cavity 132 along the length direction. The bottom end of the casting and retrieval connecting rod 12 extends into the sliding cavity 132 and is fixedly connected to the piston 133, and the casting and retrieval connecting rod 12 and the transmission rod 13 are in sliding cooperation.

[0042] The upper end of the fixing head 11 is provided with a first retaining ring 111, and the top end of the first retaining ring 111 is provided with a hollow frustum 112, the diameter of the top end of the hollow frustum 112 is smaller than the diameter of the bottom end of the hollow frustum 112.

[0043] The surface of the throwing and retrieval connecting rod 12 is in contact with the gripping claw 64.

[0044] Example 2

[0045] like Figure 2 As shown, a plunger gas lift locking device is provided. The difference between this embodiment and embodiment 1 is that the top end of the fishing connecting rod 12 is provided with a thread 122, and a limiting structure is also provided to restrict the rotation of the fishing connecting rod 12 along the axis. The limiting structure includes a limiting block provided on the fixed head 11, and a limiting groove 35 is provided on the fishing connecting rod 12 along the length direction for the limiting block to slide.

[0046] Example 3

[0047] like Figure 3 As shown, a salvage tool for salvage embodiment 1 or embodiment 2 includes a salvage housing 41. The top of the salvage housing 41 is provided with a connecting buckle 42 for connecting to a wire rope tool. The bottom of the salvage housing 41 is provided with a salvage assembly for connecting to a fixing head 11 and a salvage connecting rod 12. The interior of the salvage housing 41 is provided with a torque motor for driving the salvage assembly and a high-temperature battery 43 for supplying power to the torque motor and the salvage assembly.

[0048] The retrieval assembly includes three first retrieval claws 51 and a telescopic rod 52. The three first retrieval claws 51 are evenly spaced along the axis of the retrieval housing 41. A torque motor drives the three first retrieval claws 51 to retract towards the center. In other embodiments of the present invention, the number of first retrieval claws 51 can be 2, 4, or 5. The principle by which the torque motor 66 drives the first retrieval claws 51 to retract towards the center is consistent with that of an electric three-jaw chuck disclosed in publication number CN216680279U, which is prior art and will not be described in detail here. The bottom end of the first retrieval claw 51 is provided with a hook that cooperates with the fixed head 11. The telescopic rod 52 is disposed inside the retrieval housing 41, and the telescopic rod 52 is coaxial with the retrieval housing 41. The bottom end of the telescopic rod 52 extends out of the retrieval housing 41 and abuts against the top end of the retrieval connecting rod 12. The telescopic rod 52 is an electric telescopic rod 52, and the high-temperature battery 43 supplies power to the electric telescopic rod 52.

[0049] The working principle and usage process of this embodiment are as follows:

[0050] Using a wireline tool, this embodiment is deployed to the locking device inside the tubing. At this time, the hook of the first retrieval claw 51 is located on the side of the first retaining ring 111 near the slip 32. Then, the torque motor drives the first retrieval claw 51 to retract towards the center. The three first retrieval claws 51 grip and fix the fixing head 11. Then, the telescopic rod 52 extends. After the telescopic rod 52 abuts against the retrieval connecting rod 12, it continues to extend, thereby driving the retrieval connecting rod 12 to move downward. The downward movement of the retrieval connecting rod 12 drives the piston 133 to move downward, which in turn drives the transmission rod 13 to move downward. After the transmission rod 13 moves downward, the inclined platform 131 at the bottom of the transmission rod 13 relaxes its abutment against the two slips 32, thereby releasing the locking state of the slips 32. While the first retrieval claws 51 are gripping the fixing head 11, the wireline tool is used to pull this embodiment and the gripped locking device out of the tubing, completing the retrieval of the locking device.

[0051] Example 4

[0052] like Figure 4 As shown, a matching delivery tool for delivery embodiment 1 includes a delivery housing 41. The top of the delivery housing 41 is provided with a connecting buckle 42 for connecting to a wire cutting tool. The bottom of the delivery housing 41 is provided with a delivery component connected to a fixing head 11 and a delivery connecting rod 12. The interior of the delivery housing 41 is provided with a torque motor for driving the delivery component and a high-temperature battery 43 for supplying power to the torque motor and the delivery component.

[0053] The delivery assembly includes three second delivery claws 61 and a gripping assembly for fixing the delivery connecting rod 12. The three second delivery claws 61 are evenly spaced along the axis of the delivery housing 41. The bottom end of each second delivery claw 61 is provided with a hook that engages with the fixing head 11, and the top of each of the three second delivery claws 61 is provided with an electric push rod 62. A torque motor drives the three electric push rods 62 to retract towards the center, that is, the torque motor drives the three second delivery claws 61 to retract towards the center. A stop block 63 is provided on the side of each second delivery claw 61 near the axis of the delivery housing 41, and the stop block 63 abuts against the top of the fixing head 11. The principle of the torque motor 66 driving the second delivery claws 61 to retract towards the center is the same as that of an electric three-jaw chuck disclosed in publication number CN216680279U, which is prior art and will not be described in detail. In other embodiments of the present invention, the number of second delivery claws 61 can also be 2, 4 or 5.

[0054] The gripping assembly includes three gripping claws 64, which are evenly spaced along the axis of the loading housing 41; and the gripping claws 64 are spaced apart from the second loading claw 61; the torque motor drives the three gripping claws 64 to retract towards the center; the gripping claws 64 are connected to the loading connecting rod 12.

[0055] The principle by which the torque motor 66 drives the second retrieving claw 61 to retract towards the center is the same as that of an electric three-jaw chuck disclosed in publication number CN216680279U. The gripping claw 64 and the second retrieving claw 61 are connected to the same gear plate 67, and the gripping claw 64 is closer to the axis than the second retrieving claw 61, so that while the gripping claw 64 grips and fixes the retrieving connecting rod 12, the second retrieving claw 61 grips and fixes the fixing head 11. Furthermore, when the gripping claw 64 is in its ultimate retracted state, it will not affect the operation of the telescopic rod 52.

[0056] In other embodiments of the present invention, the number of gripping claws 64 may be 2, 4 or 5.

[0057] The working principle and usage process of this embodiment are as follows:

[0058] When the wire rope tool is connected to this embodiment, on the ground, the torque motor drives the three second-stage retrieval claws 61 to retract towards the center, gripping the fixed head 11 of Embodiment 1. Simultaneously, the three gripping claws 64 retract towards the center, gripping the retrieval connecting rod 12. Then, the wire rope tool lowers this embodiment and the locking device to the designed locking point in the oil pipe to perform the following locking actions: the gripping claws 64 maintain gripping the retrieval connecting rod 12; the electric push rod 62 at the top of the second-stage retrieval claws 61 extends, causing the stop block 63 to abut against the fixed head 11; the electric push rod 62 continues to extend, and the stop block 63 causes the fixed head 11 to move downwards. The movement causes the launching connecting rod 12 to move upward relative to the piston 133, which in turn drives the transmission rod 13 to move upward. The upward movement of the transmission rod 13 causes the inclined platform 131 to move upward. The movement of the inclined platform 131 causes the two slips 32 to move to both sides of the locking device, thereby locking the slips 32 with the oil pipe. After the locking device is locked in the oil pipe, the torque motor drives the three second launching claws 61 and the three gripping claws 64 to expand outward, thereby disengaging this embodiment from the locking device. A wire cutting tool is then used to pull this embodiment out of the oil pipe, completing the deployment of the locking device.

[0059] In actual use, the following can also be achieved: the three gripping claws 64 retract towards the center to grip the retrieval connecting rod 12, while the three second retrieval claws 61 retract towards the center. The second retrieval claws 61 are located above the fixed head 11, and the hooks of the second retrieval claws 61 abut against the top surface of the hollow truncated cone 112. Then, the wire rope tool lowers this embodiment and the locking device to the designed locking point in the oil pipe to perform the following locking action: the gripping claws 64 hold the retrieval connecting rod 12; the electric push rod 62 at the top of the second retrieval claws 61 extends, and the second retrieval claws 61 cause the fixed head 11 to move downward, achieving the same locking principle as above. After the locking device is locked in the oil pipe, the torque motor drives the three gripping claws 64 to expand outward, thereby causing this embodiment to disengage from the locking device. The wire rope tool is then used to pull this embodiment out of the oil pipe, completing the deployment of the locking device.

[0060] Example 5

[0061] like Figure 5 As shown, a matching delivery tool for delivery embodiment 2 is provided. The difference between this embodiment and embodiment 4 is that the gripping component includes a rotating rod 65. A torque motor group drives the rotating rod 65 to rotate along the axis. The rotating rod 65 is coaxially connected to the rotating shaft of one of the torque motors 66 in the torque motor group. The rotating rod 65 can be rotated by the operation of the torque motor 66. The bottom end of the rotating rod 65 is provided with a threaded hole 651 that is connected to the top thread 122 of the delivery connecting rod 12.

[0062] The working principle and usage process of this embodiment are as follows:

[0063] When connected to this embodiment using a wire rope tool, on the ground, the torque motor drives the three second retrieval claws 61 to retract towards the center, gripping the fixing head 11 of Embodiment 2. Simultaneously, the torque motor 66 operates to rotate the rotating rod 65. The threaded hole 651 at the bottom of the rotating rod 65 engages with the threaded end 122 of the retrieval connecting rod 12. The rotating rod 65 restricts the up-and-down movement of the retrieval connecting rod 12. Then, the same locking action as in Embodiment 4 is performed, locking the locking device of Embodiment 2 in the oil pipe. The torque motor then drives the three second retrieval claws 61 to expand outward. Simultaneously, the torque motor 66 operates to rotate the rotating rod 65 in the opposite direction, disengaging the rotating rod 65 from the retrieval connecting rod 12. This allows this embodiment to detach from the locking device. The wire rope tool is then used to pull this embodiment out of the oil pipe, completing the deployment of the locking device.

[0064] Example 6

[0065] like Figure 6 As shown, a matching casting and retrieval tool for Embodiment 1, which can both cast and retrieve, includes a casting housing 41. The top of the casting housing 41 is provided with a connecting buckle 42 for connecting to a wire rope tool. The bottom of the casting housing 41 is provided with a casting assembly for connecting to a fixing head 11 and a casting connecting rod 12. The interior of the casting housing 41 is provided with a torque motor for driving the casting assembly and a high-temperature battery 43 for supplying power to the torque motor and the casting assembly.

[0066] The retrieval assembly includes a retrieval component and a deployment component. The retrieval component includes three first retrieval claws 51 and a telescopic rod 52. The three first retrieval claws 51 are evenly spaced along the axis of the retrieval housing 41. A torque motor drives the three first retrieval claws 51 to retract towards the center. The bottom end of each first retrieval claw 51 is provided with a hook that engages with the fixing head 11. The telescopic rod 52 is located inside the retrieval housing 41, is coaxial with the retrieval housing 41, and its bottom end extends out of the retrieval housing 41 and abuts against the top end of the retrieval connecting rod 12. The telescopic rod 52 is electrically powered, and a high-temperature battery 43 supplies power to the electric telescopic rod 52.

[0067] The delivery assembly includes three second delivery claws 61 and a gripping assembly for fixing the delivery connecting rod 12; the three second delivery claws 61 are evenly spaced along the axis of the delivery housing 41; the bottom end of the second delivery claws 61 is provided with a hook that engages with the fixing head 11, and the top of each of the three second delivery claws 61 is provided with an electric push rod 62; the torque motor drives the three electric push rods 62 to retract towards the center, that is, the torque motor drives the three second delivery claws 61 to retract towards the center; a stop block 63 is provided on the side of the second delivery claw 61 near the axis of the delivery housing 41, and the stop block 63 abuts against the top of the fixing head 11.

[0068] The gripping assembly includes three gripping claws 64, which are evenly spaced along the axis of the loading housing 41; and the gripping claws 64 are spaced apart from the second loading claw 61; the torque motor drives the three gripping claws 64 to retract towards the center; the gripping claws 64 are connected to the loading connecting rod 12.

[0069] The principle by which the torque motor drives the first casting claw 51, the second casting claw 61, and the gripping claw 64 to retract towards the center is the same as that of an electric three-jaw chuck disclosed in CN216680279U, which is prior art. The first casting claw 51 and the second casting claw 61 are evenly spaced apart; the second casting claw 61 and the gripping claw 64 are spaced apart from each other, that is, the first casting claw 51 and the gripping claw 64 are distributed in the same direction along the axis of the casting housing 41. The top ends of the first casting claw 51 and the gripping claw 64 are connected by a connecting rod, and the connecting rod is connected to the gear plate 67. The first casting claw 51, the electric push rod 62, and the gripping claw 64 are connected to the same gear plate 67. The gripping claw 64 is closer to the axis than the first casting claw 51 and the second casting claw 61, so that while the gripping claw 64 grips the casting connecting rod 12, the first casting claw 51 and the second casting claw 61 grip the fixed head 11. Furthermore, the operation of the telescopic rod 52 is not affected when the gripper 64 is in its maximum retracted state.

[0070] Example 7

[0071] like Figure 7 As shown, a matching throwing and retrieval tool for Embodiment 2 is provided. The difference between this embodiment and Embodiment 6 is that the gripping component includes a torque motor 66 that drives the telescopic rod 52 to rotate along the axis; the bottom end of the telescopic rod 52 is provided with a threaded hole 651 that is connected to the top thread 122 of the throwing and retrieval connecting rod 12.

[0072] To ensure smooth connection between the first and second retrieval claws 51 and the locking device in the locked state, several electric push plates are evenly spaced on the retrieval housing 41 in any of embodiments 3, 6, or 7. The high-temperature battery 43 powers these electric push plates. Initially, all electric push plates are in a retracted state. When retrieving the locking device, after reaching the retrieval position in any embodiment, all electric push plates extend, making the retrieval housing 41 parallel to the oil pipe. This ensures that both the first and second retrieval claws 51 and 61 are located on the outer periphery of the locking device's fixing head 11, allowing the retrieval operation to proceed smoothly.

Claims

1. A plunger air lift locking device, characterized in that, Includes a casting and retrieval connection assembly, a buffer rod (2), and a locking assembly; The fishing and retrieval connection assembly includes a hollow fixed head (11), and a fishing and retrieval connection rod (12) is slidably arranged at the axis of the fixed head (11); the top end of the fishing and retrieval connection rod (12) extends out of the fixed head (11), and the bottom end of the fixed head (11) is coaxially fixedly connected to the buffer rod (2); the buffer rod (2) is a hollow structure, and a transmission rod (13) is slidably arranged at the axis of the buffer rod (2), and the top end of the transmission rod (13) is connected to the bottom end of the fishing and retrieval connection rod (12); the bottom end of the transmission rod (13) is connected to the locking assembly; When the fishing connecting rod (12) drives the transmission rod (13) to rise, the locking component performs locking; when the fishing connecting rod (12) drives the transmission rod (13) to fall, the locking component performs unlocking. The locking assembly includes a housing (31), the top of which is connected to a buffer rod (2); two locking plates (32) are symmetrically arranged on the housing (31), and both locking plates (32) are slidably engaged with the housing (31); a ramp (131) is fixedly connected to the bottom end of the transmission rod (13), the top end of the ramp (131) is fixedly connected to the transmission rod (13), and the width of the top end of the ramp (131) is smaller than the width of the bottom end of the ramp (131); the two locking plates (32) are respectively attached to the inclined surfaces on both sides of the ramp (131) on the side closest to the inside of the housing (31); and the locking plates (32) are slidably engaged with the ramp (131); A glue bucket (33) is also fitted onto the shell (31), and the glue bucket (33) is located at the bottom end of the clasp (32); A buffer cylinder (34) is provided at the top of the housing (31), and the buffer rod (2) is slidably engaged with the buffer cylinder (34). A protrusion (21) is provided at the bottom of the buffer rod (2), and a groove (35) is provided on the inner wall of the buffer cylinder (34) for the protrusion (21) to move along the length of the buffer rod (2). A buffer spring (36) is sleeved on the buffer rod (2), and the top of the buffer spring (36) abuts against the fixed head (11), and the bottom of the buffer spring (36) abuts against the buffer cylinder (34). A one-way valve (37) is also provided at the lower end of the housing (31). The top end of the transmission rod (13) is provided with a sliding cavity (132) along the length direction; a piston (133) is provided in the sliding cavity (132), the piston (133) slides in the sliding cavity (132) along the length direction, the bottom end of the fishing connecting rod (12) extends into the sliding cavity (132) and is fixedly connected to the piston (133), and the fishing connecting rod (12) and the transmission rod (13) are in sliding cooperation.

2. The plunger air lift locking device according to claim 1, characterized in that, The upper end of the fixing head (11) is provided with a first retaining ring (111), and the top end of the first retaining ring (111) is provided with a hollow frustum (112). The diameter of the top end of the hollow frustum (112) is smaller than the diameter of the bottom end of the hollow frustum (112); the diameter of the bottom end of the hollow frustum (112) is the same as the outer diameter of the first retaining ring (111).

3. A matching retrieval tool for retrieving the plunger gas lift locking device according to any one of claims 1-2, characterized in that, The system includes a retrieval housing (41), the top of which is provided with a connecting buckle (42) for connecting to a wire rope tool; the bottom of which is provided with a retrieval assembly for connecting to a fixing head (11) and a retrieval connecting rod (12); and the interior of the retrieval housing (41) is provided with a torque motor for driving the retrieval assembly and a high-temperature battery (43) for supplying power to the torque motor and the retrieval assembly. The retrieval assembly includes a retrieval component, which includes a plurality of first retrieval claws (51) and a telescopic rod (52); the plurality of first retrieval claws (51) are evenly spaced along the axis of the retrieval housing (41); the torque motor drives the plurality of first retrieval claws (51) to retract toward the center; the bottom end of the first retrieval claws (51) is provided with a hook that cooperates with the fixed head (11); the telescopic rod (52) is disposed inside the retrieval housing (41), and the bottom end of the telescopic rod (52) extends out of the retrieval housing (41) and abuts against the top end of the retrieval connecting rod (12).

4. The matching casting and retrieval tool according to claim 3, characterized in that, The launching assembly includes a launching component, which includes a plurality of second launching claws (61) and a gripping component for fixing the launching connecting rod (12); the plurality of second launching claws (61) are evenly spaced along the axis of the launching housing (41); the bottom end of the second launching claws (61) is provided with a hook that engages with the fixing head (11), and the top end of each of the plurality of second launching claws (61) is provided with an electric push rod (62); the torque motor drives the plurality of electric push rods (62) to retract toward the center; a stop block (63) is provided on the side of the second launching claw (61) near the axis of the launching housing (41), and the stop block (63) abuts against the top end of the fixing head (11).

5. The matching casting and retrieval tool according to claim 4, characterized in that, The gripping assembly includes a plurality of gripping claws (64), which are evenly spaced along the axis of the loading shell (41); and the gripping claws (64) are spaced apart from the second loading claws (61); the torque motor drives the plurality of gripping claws (64) to retract toward the center.

6. The matching casting and retrieval tool according to claim 4, characterized in that, The gripping assembly includes a rotating rod (65), which is driven by a torque motor to rotate along the axis. The bottom end of the rotating rod (65) is provided with a threaded hole (651), and the top end of the fishing connecting rod (12) is provided with a thread (122) that engages with the threaded hole (651). A limiting structure is also provided to restrict the rotation of the fishing connecting rod (12) along the axis. The limiting structure includes a limiting block provided on the fixed head (11), and a limiting groove (35) is provided on the fishing connecting rod (12) along the length direction for the limiting block to slide.

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