Clamping device, sucker rod operating system and workover rig including the same

Abstract

The present invention relates to a clamping device, a sucker rod operating system including the clamping device, and a well repair machine. The clamping device includes a supporting body (4), a rotating component (2), and two clamping slide blocks (1). The rotating component has two opposing channels (223) formed therein. Each clamping slide block slides in the channel and has a clamping end that can extend out of the channel to engage with a clamped object and a guide end opposite to the clamping end. The inner contour (41) of the recessed portion is configured to engage with the guide end to guide the movement of the clamping slide block, so that the rotation of the rotating component causes the two clamping slide blocks to slide, thereby clamping or releasing the clamped object. The present invention can achieve stable and reliable clamping of the clamped object with a relatively simple structure, can be applied to clamped objects of different sizes and achieve accurate clamping and positioning thereof, can achieve clamping of the sucker rod and rotational positioning of the wrench, and is conducive to realizing the automation of the sucker rod operating system.

Description

Technical Field

[0001] The invention relates to a clamping device, in particular to a clamping device for a sucker rod in a sucker rod operating system of well repair equipment. Background Art

[0002] Existing clamping devices for clamping objects (such as processing objects, processed workpieces) are often complex in structure and / or inconvenient to operate. The present invention is first intended to solve this problem.

[0003] For example, there is no dedicated clamping device for the sucker rod in the existing sucker rod lifting and lowering system of the well repair equipment. The lifting and positioning of the sucker rod uses a double elevator structure. One elevator is used as the power for the sucker rod lifting and lowering operation, and the other elevator is used as a wellhead slip to fix the sucker rod to prevent the sucker rod from sinking. The two elevators are used alternately in a repeated cycle. The installation and disassembly between the elevator and the sucker rod requires manual operation, with a low degree of automation, high manual operation intensity and low operating efficiency. At the same time, the on-site operating environment has certain risks, which affects the safety of oilfield operations.

[0004] Therefore, how to conveniently and stably clamp the sucker rod with a simple clamping and positioning device during the operation of the sucker rod is a problem that needs to be solved urgently in the well repair operation.

[0005] Furthermore, how to realize automatic clamping or loosening of the sucker rod in well repair operations to reduce or avoid manual operations, lower operation intensity and risks, and improve operation efficiency is also a problem that needs to be solved.

[0006] Furthermore, the sucker rods used in oil wells may have different diameters due to various complex operating conditions. Therefore, there is a need for a clamping device that is universal for sucker rods of various diameters to reduce the manpower and time costs caused by replacing the clamping device.

[0007] Since the clamped object may need subsequent processing after being clamped, for example, the sucker rod needs to be rotated to position the wrench so as to align with the hydraulic pliers, a clamping device that can realize the clamping, movement and positioning of the clamped object in an integrated manner is required. Furthermore, precise control of the clamping and positioning of the clamped object is also a common requirement for the clamping device.

[0008] The present invention aims to solve the above-mentioned problems and / or other problems existing in the prior art. Summary of the invention

[0009] The present invention provides a clamping device, which includes a supporting body, a rotating component and two clamping slide blocks, wherein a recessed portion is formed in the supporting body, the rotating component is at least partially accommodated in the supporting body, and the rotating component has two opposing channels formed therein, each clamping slide block is configured to slide in the corresponding channel, and has a clamping end that can extend out of the channel to engage with a clamped object and a guiding end opposite to the clamping end; the inner contour of the recessed portion is configured to engage with the guiding end of each clamping slide block to guide the movement of the clamping slide block, so that the rotation of the rotating component causes the sliding of the two clamping slide blocks to achieve clamping or release of the clamped object.

[0010] The present invention also provides a sucker rod operation system, which includes the clamping device and the control device as described above, wherein the clamping object is a sucker rod; the control device automatically controls the rotation of the rotating part of the clamping device and / or the lifting and lowering of the clamping device.

[0011] The present invention also provides a workover machine, which comprises the clamping device and the control device as described above, wherein the clamping object is a sucker rod; the control device automatically controls the rotation of the rotating part of the clamping device and / or the lifting and lowering of the clamping device.

[0012] The beneficial effect of the present invention is at least that, by forming a recessed portion in the support body and guiding the clamping slide block with the inner contour of the recessed portion to achieve the sliding of the clamping slide block, a stable and reliable clamping of the clamped object is achieved with fewer parts and a simpler structure. The rotating component can rotate in different directions relative to the rest position, and by setting sections of different diameters of the inner contour, the clamping device can be suitable for clamping objects of different sizes and can accurately clamp and position. It can also achieve the rotational positioning of the wrench side of the sucker rod while clamping the sucker rod. Moreover, the rotating component can achieve precise and controllable rotation of the sucker rod by controlling the motor through the control device under the drive of the motor, which is conducive to realizing the automation of the sucker rod operation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic perspective cross-sectional view of a clamping device according to an exemplary embodiment of the present invention is shown;

[0014] Figure 2 Shows Figure 1 a top view of the clamping device shown with the rotating disc removed in order to clearly illustrate the inner contour of the support body and the engagement of the rolling device;

[0015] Figure 3 A three-dimensional schematic diagram of an exemplary support body of the present invention is shown;

[0016] Figure 4 Show Figure 3 A schematic perspective cross-sectional view of the support body shown; and

[0017] Figure 5 A schematic perspective view of an exemplary slide receiving member of the present invention is shown. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further specifically described below by way of examples and in conjunction with the accompanying drawings. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall concept of the present invention and should not be construed as a limitation of the present invention.

[0019] In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments. However, it is apparent that one or more embodiments may be implemented without these specific details. In addition, to simplify the drawings, well-known structures and devices are not shown in the illustrated manner.

[0020] like Figure 1 , 2 As shown, according to an exemplary embodiment of the present invention, a clamping device is provided, the clamping device includes a supporting body 4, a rotating component 2 and two clamping slides 1, wherein a recessed portion is formed in the supporting body 4, the rotating component 2 is at least partially accommodated in the supporting body 4, wherein the rotating component 2 has two opposing channels 223 formed therein, each of the two clamping slides 1 is configured to slide in the corresponding channel 223 and has a clamping end 11 that can extend out of the channel 223 to engage with a clamped object and a guiding end opposite to the clamping end, the inner contour 41 of the recessed portion is configured to engage with the guiding end of each clamping slide 1 to guide the movement of the clamping slide 1, so that the rotation of the rotating component 2 causes the two clamping slides 1 to slide, so as to achieve clamping or release of the clamped object.

[0021] In this example, when the rotating component 2 is driven to rotate, since the two clamping sliders 1 are both located in the channel 223 formed in the rotating component 2, the rotating component 2 drives the two clamping sliders 1 to rotate. Figure 2 Under the guidance of the inner contour 41 of the recessed portion of the support body 4, the two clamping sliders 1 slide in the channels 223 respectively, so as to slide towards each other to clamp the clamped object, or slide away from each other to release the clamped object. In the above structure, by forming a recessed portion in the support body and guiding the clamping slider with the inner contour of the recessed portion to realize the sliding of the slider, a stable and reliable clamping of the clamped object is achieved with fewer parts and a simpler structure.

[0022] As an example, Figure 1 As shown, the clamping object is a sucker rod 6 , and the sucker rod 6 includes a wrench square 61 and a flange portion 62 adjacent to the wrench square. The clamping end 11 of the clamping slider 1 is configured to be suitable for clamping the flange portion 62 .

[0023] It will be appreciated by those skilled in the art that although Figure 1 In the text and description of this article, the clamping object is illustrated and described by taking the sucker rod as an example, but the applicable field of the clamping device of the present invention is obviously not limited to this. For example, it can also be used to clamp the sucker pipe in well repair operations. Furthermore, it can be used as a universal clamping device to clamp various clamping objects.

[0024] like Figure 1 , 2 As shown in Figure 3, each of the clamping sliders 1 includes a rolling device 12 arranged at the guide end; the inner contour 41 includes a first section 411 and a second section 413 which are centrally symmetrical. When the rotating component 2 rotates from the rest position toward the first direction, the two rolling devices 12 roll along the first section 411 and the second section 413 respectively.

[0025] Since the two clamping slide blocks 1 where the two rolling devices 12 are located are respectively located in two opposite channels 223 in the rotating component 2, when the first section 411 and the second section 413 of the inner contour 41 form a central symmetrical contour, the movements of the two rolling devices 12 are consistent and synchronous, so that the clamping movement process is smoother and more stable. In addition, this central symmetrical structure is more conducive to the processing of the inner contour of the support body 4.

[0026] Those skilled in the art will appreciate that in the above example, two rolling devices 12 are provided to reduce friction between the clamping slider 1 and the inner contour 41 of the support body 4, but the present invention is not limited thereto. As an example, the leading end of the clamping slider can be processed into a relatively smooth end.

[0027] As an example, Figure 2-4 As shown, the inner contour 41 also includes a third section 412 and a fourth section 414 which are centrally symmetrical, wherein when the rotating component 2 rotates from the rest position toward the second direction, the two rolling devices 12 roll along the third section 412 and the fourth section 414 respectively.

[0028] Through the above structure, the rotating component 2 can rotate in different directions relative to the rest position, so that the first section 411 / the second section 413 and the third section 412 / the fourth section 414 can be designed with different curve profiles to adapt to different clamping objects.

[0029] Preferably, the first section 411, the second section 413, the third section 412 and the fourth section 414 respectively include an open section 41R and a closed section 41C, wherein when the rolling device is located in the open section 41R, the two clamping sliders 1 are not engaged with the clamped object, and when the rolling device is in the closed section 41C, the two clamping sliders 1 are engaged with the clamped object to clamp it; wherein the diameter of the closed section 41C of the first section 411 is different from the diameter of the closed section of the third section 412.

[0030] Through the contour structure of the above example, the clamping device can realize stable clamping and releasing actions, and can also clamp objects of different sizes.

[0031] like Figure 2-4 As shown, there are protruding blocking portions 42 between the closing section 41C of the first section 411 and the closing section 41C of the fourth section 414, and between the closing section 41C of the second section 413 and the closing section 41C of the third section 412, respectively, to prevent the rolling device from continuing to move. This structure ensures that when the rotating component rotates to a certain extent, the rolling device is prevented from continuing to move by the blocking portion 42, so the rotating component does not continue to rotate.

[0032] Further, still refer to Figure 2-4 , each of the closed sections 41C is configured so that after the two clamping sliders 1 clamp the clamped object, the rotating component 2 can still rotate to drive the clamped object to rotate through the two clamping sliders 1. Specifically, as an example, the closed section 41C extends in the form of an arc. And preferably, the extension length (or extension range) of the arc can be determined according to the stroke that the clamped object needs to rotate after clamping the clamped object. Those skilled in the art can also understand that the diameter of the arc of the closed section 41C is adapted to the length of the clamping slider 1 and the size of the clamped object.

[0033] The structure of this example can realize that after the clamped object is clamped, the clamped object can be further rotated according to the positioning requirements of the clamped object. For example, when the clamped object is a sucker rod, Figure 1 As shown, the clamping ends 11 of the two clamping sliders are clamped at the flange 62 adjacent to the wrench 61 at the clamping position of the sucker rod. During the process of raising and lowering the sucker rod, since the two adjacent sucker rods are connected by a threaded coupling (not shown), the upper and lower sucker rods need to be unhooked (i.e., the connection between the two sucker rods is disconnected) during the process of removing the sucker rod. The sucker rod at the bottom is the clamping object. Figure 1The clamped slide block 1 is shown, and the hydraulic pliers responsible for loosening the sucker rod and coupling below need to twist the coupling. During the twisting process, the backing clamp of the hydraulic pliers is clamped on the wrench square to fix the sucker rod below, that is, the clamped object. Therefore, the wrench square 61 needs to be positioned so that its flat surface is aligned with the clamping part of the backing clamp. By adopting the clamping device of the present invention, the rotating component 2 can continue to drive the clamping slide block 1 and then drive the clamped object to rotate to the desired position while clamping the flange portion 62, so as to achieve the alignment of the wrench square relative to the hydraulic pliers.

[0034] Those skilled in the art will appreciate that, although the pumping rod tripping operation is used as an example of the pumping rod operation in the context, the present invention is not limited thereto. As described above, the clamping device can also be used to clamp the pumping pipe, and is not limited to the pumping rod / pumping pipe tripping operation, and can also be used to clamp the pumping rod / pumping pipe during operations such as the transport, cleaning, and inspection of the pumping rod / pumping pipe.

[0035] As an example of a rolling device, Figure 1 , 4 As shown, the rolling device 12 includes a shaft 121 fixed on the clamping slider 1 and a first roller 122 and a second roller 123 which are arranged in parallel on the shaft 121, and the inner contour 41 includes a first guide portion 410 and a second guide portion 419, the first guide portion 410 is formed as a side wall of the recessed portion, and the first roller 122 is engaged with the first guide portion 410, the second guide portion 419 is formed as a groove located in the bottom wall of the recessed portion, and the second roller 123 is located in the groove.

[0036] The rolling device 12 of the above structure is used so that when the rotating part 2 moves from the rest position to the position for clamping the clamped object, the first roller 122 abuts against the first guide portion 410 of the inner contour 41, i.e., the side wall of the recessed portion of the support body 4, thereby applying a pushing force to the first roller 122 to push the clamping slider 1 to slide toward the clamped object in the channel 223. In the process of releasing the clamped object and returning to the rest position, the second roller 123 abuts against the radial inner side of the groove in the second guide portion 419, i.e., the bottom wall of the recessed portion, thereby applying a pushing force to the second roller 123 to push the clamping slider 1 to slide away from the clamped object in the channel 223.

[0037] As an example, the rotating component includes two parts, such as Figure 1 , 5As shown, the rotating component 2 includes a rotating disk 21 driven by a transmission device and a slider accommodating member 22 connected to the rotating disk 21 for rotation together; wherein a through hole 221 is formed in the slider accommodating member 22 for the clamped object to pass through, and the slider accommodating member 22 includes a main body portion 222 at least partially accommodated in the recessed portion of the supporting body 4, wherein the two channels 223 extend from the outer side surface of the main body portion 222 to the through hole 221.

[0038] Those skilled in the art may understand that, although the rotating component 2 is described herein by taking the structure including the rotating disk 21 and the slider accommodating member 22 connected to the rotating disk 21 for rotation therewith as an example, the structure of the rotating component 2 may not be limited thereto, as long as the corresponding function of the rotating component 2 can be achieved.

[0039] Preferably, if Figure 1 As shown, the rotating disk 21 is supported on the supporting body 4 and covers the inner contour 41 and the rolling device 12 engaged with the inner contour 41. Therefore, it is possible to prevent debris, dust, etc. from entering the interior of the clamping device, especially to prevent debris, dust, etc. from entering the portion where the rolling device 12 engages with the inner contour 41 and affecting the relative movement therebetween.

[0040] As an example of a connection in which the rotating disk 21 rotates together with the slider receiving member 22, Figure 1 , 5 As shown, the main body 222 of the slider accommodating member 22 is cylindrical and is provided with an anti-rotation step 224 at the end connected to the rotating disk 21. The rotating disk 21 is formed with a central cutout, and the contour of the central cutout matches the contour of the anti-rotation step to achieve a non-relatively rotating connection between the rotating disk 21 and the slider accommodating member 22.

[0041] Exemplarily, two edges of the anti-rotation step 224 extend respectively along the direction of the chord length of the circular cross section of the cylindrical main body 222. This structure is advantageous for machining the slider receiving member 22.

[0042] Those skilled in the art will appreciate that the structure of the slider accommodating member 22 is described above as an example; however, the structure of the slider accommodating member 22 is not limited thereto, and other structures may also be adopted. Various modifications and variations that can achieve its functions are also within the scope of protection of the appended claims of the present invention.

[0043] As a transmission device of the rotating part, exemplarily, the clamping device includes a motor 31 and a transmission device arranged between the output shaft of the motor 31 and the rotating part 2; wherein the motor 31 is suitable for being controlled to control the rotation of the rotating part 2.

[0044] Preferably, the motor 31 may be an electric motor, such as a stepping motor or a hydraulic motor, so that the output of the motor can be precisely controlled by the control device, thereby achieving precise control of the rotation of the rotating component and precise positioning of the clamped object.

[0045] Exemplarily, the transmission device includes a gear 32 , wherein a tooth portion 211 engaging with the gear 32 is provided on the rotating disk 21 .

[0046] For example, Figure 1 As shown, the clamping device further includes a lifting rod 5, which is connected to the supporting body 4 to realize the lifting of the clamping device, so that the clamping device can more flexibly meet the movement requirements of the work site. For the sake of simplicity of introduction, the driving and transmission devices of the lifting rod are not shown here, but those skilled in the art can understand that various driving and transmission mechanisms can be used, for example, it can include a driving device suitable for being controlled.

[0047] According to an exemplary embodiment of the present invention, a sucker rod operating system is also provided, which includes the clamping device and the control device described in the above examples, wherein the clamping object is a sucker rod, and the control device automatically controls the rotation of the rotating part 2 of the clamping device and / or the lifting and lowering of the clamping device.

[0048] According to another exemplary embodiment of the present invention, a workover machine is provided, which includes the clamping device described in the above examples and a control device, wherein the control device automatically controls the rotation of the rotating part 2 of the clamping device and / or the lifting and lowering of the clamping device.

[0049] The sucker rod operation system and the workover rig thus have the advantages of the clamping device described in the above examples. In addition, due to the use of the control device, the rotation direction and degree of the rotating component are accurately controlled, which realizes the accurate clamping of the sucker rod and the precise control of the rotation angle of the sucker rod, thereby realizing the precise alignment of the wrench. At the same time, the control of the lifting and lowering of the clamping device facilitates the coordinated movement of the clamping device and other operating devices such as hydraulic clamps, elevators, etc. during the operation of the sucker rod, thereby facilitating the automation of the sucker rod lifting and lowering operation, reducing or avoiding manual operation and improving the operation efficiency. In view of the current low level of automation in the field of workover rigs, the application of the clamping device in the field of workover rigs is particularly innovative. Furthermore, due to the special shape and performance of the sucker rod, the operation of the sucker rod in the existing workover technology is basically carried out manually. The application of the clamping device in the sucker rod operation system in the present invention has important innovative significance for realizing the automation of the sucker rod operation and the automation of the entire workover rig.

[0050] For those skilled in the art, various modifications and variations may be made to the embodiments disclosed above without departing from the scope or spirit of the present invention. Other embodiments of the present invention will be apparent to those skilled in the art from the practice of the present invention disclosed in this specification. This specification and the examples disclosed therein should be considered to be illustrative only, and the true scope of the present invention is specified by the appended claims and their equivalents.

Claims

1. A sucker rod clamping device, wherein the sucker rod (6) comprises a wrench square (61) and a flange portion (62) adjacent to the wrench square, characterized in that: The sucker rod clamping device comprises: A support body (4) having a recessed portion formed therein; a rotating member (2) at least partially accommodated in the supporting body (4), wherein the rotating member (2) has two opposing channels (223) formed therein; and Two clamping slide blocks (1), each clamping slide block (1) is configured to slide in the corresponding channel and has a clamping end (11) that can extend out of the channel to engage the sucker rod and a guide end opposite to the clamping end (11), the clamping end (11) being suitable for clamping the flange portion (62) at a clamping position of the sucker rod; The inner contour (41) of the recessed portion is configured to engage with the guide end of each clamping slide block (1) to guide the movement of the clamping slide block (1), so that the rotation of the rotating component (2) causes the two clamping slide blocks (1) to slide, thereby achieving the clamping or loosening of the sucker rod.

2. The sucker rod clamping device according to claim 1, characterized in that: Each of the clamping slide blocks (1) comprises a rolling device (12) arranged at the guide end; The inner contour (41) comprises a first section (411) and a second section (413) which are centrally symmetrical, and when the rotating component (2) rotates in a first direction relative to the rest position, the two rolling devices (12) roll along the first section (411) and the second section (413) respectively.

3. The sucker rod clamping device according to claim 2, characterized in that: The inner contour (41) further comprises a third section (412) and a fourth section (414) which are centrally symmetrical, wherein when the rotating component (2) rotates in a second direction relative to the rest position, the two rolling devices (12) roll along the third section (412) and the fourth section (414) respectively.

4. The sucker rod clamping device according to claim 3, characterized in that: The first section (411), the second section (413), the third section (412) and the fourth section (414) respectively include an open section (41R) and a closed section (41C); when the rolling device is located in the open section (41R), the clamping ends (11) of the two clamping slide blocks (1) are not engaged with the sucker rod; when the rolling device is in the closed section (41C), the clamping ends (11) of the two clamping slide blocks (1) are engaged with the sucker rod to clamp it; The diameter of the closed section (41C) of the first section (411) is different from the diameter of the closed section of the third section (412).

5. The sucker rod clamping device according to claim 4, characterized in that: There are protruding blocking portions (42) between the closed section (41C) of the first section (411) and the closed section of the fourth section (414), and between the closed section (41C) of the second section (413) and the closed section of the third section (412) to prevent the rolling device from continuing to move.

6. The sucker rod clamping device according to claim 4 or 5, characterized in that: Each of the closed sections (41C) is extended so that after the two clamping slide blocks (1) clamp the sucker rod, the rotating component (2) can still rotate to drive the sucker rod to rotate through the two clamping slide blocks (1).

7. The sucker rod clamping device according to claim 2, characterized in that: The rolling device (12) comprises a shaft (121) fixed on the clamping slider (1), and a first roller (122) and a second roller (123) sleeved in parallel on the shaft (121), and, The inner contour (41) comprises: a first guide portion (410) formed as a side wall of the recessed portion, wherein the first roller (122) engages with the first guide portion (410), and The second guide portion (419) is formed as a groove located in the bottom wall of the recessed portion; the second roller (123) is located in the groove.

8. The sucker rod clamping device according to claim 1, characterized in that: Also includes: a motor (31), and A transmission device arranged between the output shaft of the motor (31) and the rotating component (2); The motor (31) is suitable for being controlled to control the rotation of the rotating component (2).

9. The sucker rod clamping device according to claim 8, characterized in that: The rotating component (2) comprises a rotating disk (21) driven by the transmission device and a slider receiving member (22) connected to the rotating disk (21) to rotate together; wherein, A through hole (221) for the sucker rod to pass through is formed in the slider accommodation member (22), and the slider accommodation member (22) includes a main body portion (222) at least partially accommodated in the recessed portion of the support body (4), wherein the two channels (223) extend from the outer side surface of the main body portion to the through hole (221).

10. The sucker rod clamping device according to claim 9, characterized in that: The rotating disk (21) is supported on the supporting body (4) and covers the inner contour (41) and a guide end engaged with the inner contour (41).

11. The sucker rod clamping device according to claim 9 or 10, characterized in that: The main body (222) of the slider accommodating member (22) is cylindrical and is provided with an anti-rotation step (224) at the end connected to the rotating disk (21). The rotating disk (21) is provided with a central cutout, the contour of the central cutout matches the contour of the anti-rotation step to achieve a non-relatively rotational connection between the rotating disk (21) and the slider accommodating member (22).

12. The sucker rod clamping device according to claim 11, characterized in that: The two edges of the anti-rotation step (224) extend respectively along the direction of the chord length of the circular cross section of the cylindrical main body (222).

13. The sucker rod clamping device according to claim 9, characterized in that: The transmission device comprises a gear (32), wherein the rotating disk (21) is provided with a toothed portion (211) engaged with the gear (32).

14. The sucker rod clamping device according to claim 1, characterized in that: It also includes a lifting rod (5) which is connected to the supporting body (4) to achieve the lifting and lowering of the clamping device.

15. A sucker rod operation system, characterized in that: include: The sucker rod clamping device according to any one of claims 1 to 14; as well as A control device, wherein the control device automatically controls the rotation of the rotating component (2) of the clamping device and / or the lifting and lowering of the clamping device.

16. A workover machine, characterized in that: include: The sucker rod clamping device according to any one of claims 1 to 14; as well as A control device, wherein the control device automatically controls the rotation of the rotating component (2) of the clamping device and / or the lifting and lowering of the clamping device.

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