Sucker rod connecting structure and sucker rod string

Abstract

The application provides a sucker rod connecting structure and a sucker rod string, and relates to the technical field of oil exploitation. The sucker rod connecting structure comprises: a first joint, which comprises a connecting head and at least two claw springs, the connecting head is used for connecting one end of a sucker rod, the at least two claw springs are arranged at one end of the connecting head in the axial direction and are arranged at intervals in the circumferential direction, thereby forming a contraction space coaxial with the connecting head, and the end of each claw spring away from the connecting head is provided with a locking part respectively away from one side of the contraction space; and a second joint, which comprises a connecting body and a wedge shaft, the connecting body is an axial through structure, a first end of the connecting body is used for connecting the other end of the sucker rod and is used for being connected with the first joint of another sucker rod, an inner wall of the connecting body and close to a second end are provided with a locking groove in the circumferential direction, and the wedge shaft is arranged in the connecting body and can be adjusted in the axial position in the connecting body.

Description

Technical Field

[0001] This application relates to the field of oil extraction technology, and in particular to a sucker rod connection structure and a sucker rod string. Background Technology

[0002] The sucker rod is the component that transmits the power and motion of the pumping unit to the downhole pump for suction. Each sucker rod is approximately 8 meters long, and a typical oil well requires around 100 sucker rods. Currently, sucker rods are usually connected by threaded couplings. The couplings are pre-connected before each sucker rod is lowered into the well. During installation, specialized equipment is used to lift the sucker rod and erect it at the wellhead. The couplings are then threadedly connected to the sucker rods inside the well. Each sucker rod is lowered into the well after it is connected at the wellhead, and so on, until all sucker rods are lowered into the well.

[0003] The use of coupling threads to connect sucker rods has the following disadvantages: First, when connecting two sucker rods, the sucker rod at the wellhead needs to be rotated about 10 times, which takes a long time and is labor-intensive, affecting oil well production; Second, sucker rods used downhole for a long time will generate a certain torque, which can easily cause the threads at the sucker rod connection to loosen or even come off.

[0004] Therefore, how to provide a simple, quick, and highly reliable sucker rod connection structure is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a sucker rod connection structure and a sucker rod column to solve the technical problems of time-consuming, labor-intensive, and easily loosened screw rods that are usually connected by couplings.

[0006] To address the aforementioned technical problems, this application provides the following technical solutions:

[0007] The first aspect of this application provides a sucker rod connection structure, which includes: a first connector, comprising: a connector head and at least two claw springs, the connector head being used to connect one end of the sucker rod, the at least two claw springs being disposed at one axial end of the connector head and spaced apart circumferentially thereon to form a contraction space coaxial with the connector head, and each claw spring having a locking part disposed on the side opposite to the contraction space at the end away from the connector head;

[0008] The second connector includes a connecting body and a wedge shaft. The connecting body is an axially through structure. Its first end is used to connect to the other end of a sucker rod and to dock with the first connector of another sucker rod. A locking groove is provided circumferentially on the inner wall of the connecting body near the second end. The wedge shaft is disposed in the connecting body and its axial position within the connecting body is adjustable.

[0009] The at least two claw springs of the first connector extend into the connector from the second end of the connector. During the process of the locking part of the at least two claw springs from the second end to the locking groove, the at least two claw springs are in a retracted state. When the locking part is located in the locking groove, the at least two claw springs are in a non-retracted state, and the first end of the wedge shaft is positioned in the retraction space and its radial dimension is adapted to the retraction space.

[0010] Wherein, the first end and the second end are two ends that are axially opposite to each other of the connecting body, and the first end is the end of the wedge shaft that is away from the first end.

[0011] In some modified embodiments of the first aspect of this application, a limiting ring is provided circumferentially on the inner wall of the connector near the first end;

[0012] The second connector also includes:

[0013] A spring is disposed between the second end of the wedge shaft and the limiting ring.

[0014] When the first connector is connected to the second connector and the locking part is located in the locking groove, the spring is in a compressed state to hold the first end of the wedge shaft against the contraction space;

[0015] The second end is the end of the wedge shaft that is opposite to the first end in the circumferential direction.

[0016] In some modified embodiments of the first aspect of this application, the outer diameter of the at least two claw springs is smaller than the outer diameter of the connector;

[0017] The second connector also includes:

[0018] A push sleeve is coaxial with the connecting body and fixed to the second end of the connecting body;

[0019] When the first connector is connected to the second connector, and the first end of the wedge shaft is located within the contraction space, the end face of the push sleeve away from the connector body is in contact with the end face of the connector head;

[0020] The outer diameters of the push sleeve, the connecting body, and the connecting head are the same.

[0021] In some modified embodiments of the first aspect of this application, the connecting body is provided with a first disassembly hole extending along its axial direction, and the wedge shaft is provided with a second disassembly hole extending along its axial direction, the first disassembly hole and the second disassembly hole being circumferentially corresponding;

[0022] When the first connector is connected to the second connector, and the first end of the wedge is located within the contraction space, at least a portion of the second disassembly hole near the second end is exposed in the first disassembly hole, and the axial distance between the edge of the second disassembly hole near the second end and the first disassembly hole and its edge on the same side is not less than the axial length of the portion of the wedge located within the contraction space.

[0023] In some modified embodiments of the first aspect of this application, the connecting body is provided with a pin hole for installing a pin;

[0024] The wedge shaft has a limiting groove extending along its axial direction and corresponding to the pin hole in its circumferential position. The end of the pin extends into the limiting groove and the diameter of its end is adapted to the circumferential dimension of the limiting groove on the wedge shaft.

[0025] In some modified embodiments of the first aspect of this application, the end face of the locking portion facing away from the connector is a first wedge-shaped inclined surface;

[0026] The end face of the second end of the connector and the end face of the locking groove near the first end are respectively second wedge-shaped inclined surfaces adapted to the first wedge-shaped inclined surface.

[0027] In some modified embodiments of the first aspect of this application, the end face of the locking portion near the connector is a third wedge-shaped slope;

[0028] The end face of the locking groove near the second end is a fourth wedge-shaped inclined surface that is adapted to the third wedge-shaped inclined surface.

[0029] In some modified embodiments of the first aspect of this application, a disassembly tool is further included, comprising a disassembly head and a handle, the disassembly head including a plug end and a fixed end facing away from each other, the plug end being used to extend into the first disassembly hole and a second disassembly hole exposed in the first disassembly hole, and the handle being fixed to the fixed end.

[0030] In some modified embodiments of the first aspect of this application, the disassembly head is a flat plate structure with a thickness less than the width of the first disassembly hole and the second disassembly hole, and the width of the disassembly head gradually decreases from the fixed end to the plug end.

[0031] A second aspect of this application provides a sucker rod string, which includes: a plurality of the above-described sucker rod connection structures; a plurality of sucker rods, each sucker rod having a first connector and a second connector of the sucker rod connection structure respectively installed at both ends;

[0032] The multiple sucker rods are connected together via the first connector and the second connector to form the sucker rod string.

[0033] Compared to existing technologies, the sucker rod connection structure and sucker rod string provided in this application, by pre-connecting a first joint and a second joint at both ends of the sucker rod, allows the sucker rod to be connected to the first joint of another sucker rod downhole during the installation of the sucker rod. Through the cooperation of the claw spring and locking part of the first joint with the locking groove and wedge shaft of the second joint, the two sucker rods can be quickly and reliably connected. Furthermore, since the first joint and the second joint can rotate relative to each other after connection, the torque and load generated by the sucker rod downhole can be overcome, thus preventing the sucker rod connection from loosening or even disengaging. Attached Figure Description

[0034] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, with the same or corresponding reference numerals denoteing the same or corresponding parts, wherein:

[0035] Figure 1 A schematic diagram of a half-section of the first joint of the sucker rod connection structure provided in an embodiment of the present invention is shown.

[0036] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of section AA;

[0037] Figure 3 A schematic diagram of a half-section of the second connector of the sucker rod connection structure provided in an embodiment of the present invention is shown.

[0038] Figure 4 The diagram illustrates a half-section of the sucker rod connection structure provided in an embodiment of the present invention after the first and second joints are connected.

[0039] Figure 5 A schematic diagram of the disassembly tool provided in an embodiment of the present invention is shown.

[0040] Figure 6 The diagram illustrates a structural schematic of the disassembly tool provided in an embodiment of the present invention from another angle.

[0041] Explanation of icon numbers:

[0042] First connector 1, connector 11, claw spring 12, fifth wedge-shaped inclined surface 121, locking part 13, first wedge-shaped inclined surface 131, third wedge-shaped inclined surface 132, second connector 2, connecting body 21, first end 21a, second end 21b, locking groove 211, fourth wedge-shaped inclined surface 2111, limiting ring body 212, first disassembly hole 213, pin hole 214, pin 215, second wedge-shaped inclined surface 216, wedge shaft 22, first end 22a, second end 22b, second disassembly hole 221, limiting groove 222, wedge-shaped conical surface 223, spring 23, push sleeve 24, disassembly tool 3, disassembly head 31, plug end 31a, fixed end 31b, handle 32. Detailed Implementation

[0043] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0044] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0045] Example 1

[0046] Reference Appendix Figure 1 -Appendix Figure 4Embodiment 1 of the present invention proposes a sucker rod connection structure, which includes: a first connector 1, comprising: a connector 11 and at least two claw springs 12, wherein the connector 11 is used to connect one end of the sucker rod, and the at least two claw springs 12 are disposed at one axial end of the connector 11 and are spaced apart circumferentially thereon to form a contraction space coaxial with the connector 11, and each claw spring 12 has a locking part 13 on the side away from the contraction space at the end away from the connector 11; and a second connector 2, comprising: a connecting body 21 and a wedge shaft 22, wherein the connecting body 21 is an axially through structure, its first end 21a is used to connect the other end of the sucker rod and to mate with the first connector 1 of another sucker rod, and the inner wall of the connecting body 21 near the second end 21b is provided with a locking groove 211 circumferentially thereon. The wedge shaft 22 is disposed within the connecting body 21 and its axial position within the connecting body 21 is adjustable; the at least two claw springs 12 of the first connector 1 extend into the connecting body 21 from the second end 21b of the connecting body 21. During the process of the locking portion 13 of the at least two claw springs 12 moving from the second end 21b to the locking groove 211, the at least two claw springs 12 are in a retracted state. When the locking portion 13 is located within the locking groove 211, the at least two claw springs 12 are in a non-retracted state, and the first end 22a of the wedge shaft 22 is positioned within the retraction space and its radial dimension is adapted to the retraction space; wherein, the first end 21a and the second end 21b are the two ends of the connecting body 21 that are axially opposite, and the first end 22a is the end of the wedge shaft 22 that is away from the first end 21a.

[0047] Specifically, the sucker rod connection structure provided in this embodiment is used to connect sucker rods (not shown in the figure) to form a sucker rod string. This connection structure includes a first connector 1 and a second connector 2. Before the sucker rods are lowered into the well, the first connector 1 and the second connector 2 are connected to both ends of each sucker rod, respectively. Taking the direction of the sucker rod's lowering into the well as a reference, the first connector 1 and the second connector 2 can be connected to the lower and upper ends of the sucker rod, respectively. During the lowering of the sucker rods into the well, the sucker rods are connected by butt-jointing the first connector 1 and the second connector 2.

[0048] Specifically, the first connector 1 includes a connector 11 and at least two claw springs 12. The connector 11 is used to connect one end of the sucker rod. There are at least two claw springs 12, which are located at one end of the connector 11 in the axial direction, specifically at the end of the connector 11 opposite to the end of the connector 11 used to connect the sucker rod. All the claw springs 12 are circumferentially spaced at the end of the connector 11, and each claw spring 12 has a certain length in the axial direction so that a contraction space coaxial with the connector 11 is formed between all the claw springs 12. The claw springs 12 can contract into the contraction space under the action of external force and can return to their original position after the external force is removed. Each claw spring 12 has a locking part 13 on the side away from the end of the connector 11 and opposite to the contraction space. The connector 11 and the claw springs 12 are integrally formed. The second connector 2 includes a connecting body 21 and a wedge shaft 22. The connecting body 21 is an axially continuous structure, and its outer diameter can be the same as the outer diameter of the connector 11. The connecting body 21 includes a first end 21a and a second end 21b that are axially opposite to each other. The first end 21a is used to connect to the other end of the sucker rod and is used to mate with the first connector 1 connected to another sucker rod during well drilling. A locking groove 211 is provided circumferentially on the inner wall of the connecting body 21 near the second end 21b. This locking groove 211 engages with the claw spring 12 of the first connector 1 in the unretracted state. The external shape and size of the entire locking part 13 are adapted to each other. The inner diameter of the part of the connecting body 21 located between the second end 21b and the locking groove 211 is not less than the outer diameter of the entire locking part 13 of the first connector 1 in the uncontracted state. The wedge shaft 22 is disposed in the connecting body 21. It includes a first end 22a and a second end 22b that are axially opposite to each other. The radial dimension of the wedge shaft 22 is adapted to the inner diameter of the connecting body 21. It is movably connected to the connecting body 21 so that the axial position of the wedge shaft 22 in the connecting body 21 can be adjusted as needed.

[0049] When a sucker rod is connected to another sucker rod during well construction, the claw spring 12 of the first connector 1 of the other sucker rod extends from the second end 21b of the connector 21 into the connector 21 and moves toward the locking groove 211. During this process, since the inner diameter of this part of the connector 21 is smaller than the outer diameter of the locking part 13, the locking part 13 overcomes the elastic force of the claw spring 12 and contracts into the contraction space. When the locking part 13 moves into the locking groove 211, since the diameter of the locking groove 211 is not smaller than the outer diameter of the locking part 13, the locking part 13 expands due to the elastic force of the claw spring 12. At this time, the first end 22a of the wedge shaft 22 is located in the contraction space, and its radial dimension is adapted to the contraction space. Thus, the wedge shaft 22 can limit the diameter contraction of the locking part 13, thereby confining the locking part 13 within the locking groove 211, achieving the purpose of quick and reliable connection of the two sucker rods. During disassembly, the axial position of the wedge shaft 22 is adjusted to remove the restriction on the locking part 13, which will be described in detail below.

[0050] Among them, the first end 21a of the connecting head 11 of the first connector 1 and the connecting body 21 of the second connector 2 are respectively threaded female heads that are adapted to the threaded male heads at both ends of the sucker rod. Before the sucker rod is lowered into the well, it is threaded to both ends of the sucker rod. Since the first connector 1 and the second connector 2 can still rotate relative to each other after docking, even if the sucker rod generates torque downhole, it can be offset by the relative rotation of the first connector 1 and the second connector 2 without affecting the reliability of the threaded connection between the first connector 1 and the second connector 2 and the sucker rod.

[0051] Based on the above, this embodiment of the invention proposes a sucker rod connection structure. By pre-connecting a first connector 1 and a second connector 2 at both ends of the sucker rod, during the well drilling operation, the sucker rod is connected to the first connector 1 of another sucker rod downhole via the second connector 2. Through the cooperation of the claw spring 12 and locking part 13 of the first connector 1 with the locking groove 211 and wedge shaft 22 of the second connector 2, a quick and reliable connection between the two sucker rods can be achieved. Furthermore, since the first connector 1 and the second connector 2 can rotate relative to each other after connection, the torque and load generated by the sucker rod downhole can be overcome, thus preventing the sucker rod connection from loosening or even disengaging.

[0052] Further, see attached document. Figure 3 and attached Figure 4 In a specific implementation, a limiting ring 212 is provided circumferentially on the inner wall of the connector 21 near the first end 21a; the second connector 2 further includes a spring 23, which is disposed between the second end 22b of the wedge shaft 22 and the limiting ring 212; when the first connector 1 is connected to the second connector 2 and the locking part 13 is located in the locking groove 211, the spring 23 is in a compressed state to hold the first end 22a of the wedge shaft 22 against the contraction space; wherein, the second end 22b is the end of the wedge shaft 22 that is circumferentially opposite to the first end 22a.

[0053] Specifically, in order to achieve the adjustment of the circumferential position of the wedge shaft 22 in the connecting body 21 and the positioning after adjustment, the technical solution adopted in this invention is to provide a limiting ring 212 on the inner wall of the connecting body 21 near the first end 21a. The limiting ring 212 can be circumferentially wrapped around the inner wall of the connecting body 21 or circumferentially wrapped around a portion of its length. The second connector 2 also includes a spring 23 that cooperates with the wedge shaft 22. The spring 23 is located between the second end 22b of the wedge shaft 22 and the limiting ring 212.

[0054] Before the first connector 1 and the second connector 2 are connected, i.e. in the initial state, the wedge shaft 22 is located on the side of the locking groove 211 near the first end 21a. When the sucker rod is connected, as the claw spring 12 of the first connector 1 extends into the connecting body 21 from the second end 21b and moves toward the locking groove 211, the claw spring 12 will press against the first end 22a of the wedge shaft 22 and overcome the need to move due to the spring 23. When the locking part 13 moves into the locking groove 211, the first end 22a of the wedge shaft 22 will be pushed by the elastic force of the spring 23, located in the contraction space and close to the inner wall of the claw spring 12, so as to limit the diameter reduction of the locking part 13.

[0055] Optimally, the inner wall of the portion of the claw spring 12 corresponding to the locking part 13 can be configured as a fifth wedge-shaped inclined surface 121. Correspondingly, the outer peripheral surface of the first end 22a of the wedge shaft 22 can be configured as a wedge-shaped conical surface 223 adapted to the fifth wedge-shaped inclined surface 121 of the claw spring 12, so that the two can play a better guiding and limiting role when they are engaged. The outer periphery of the second end 22b of the wedge shaft 22 can be provided with an annular groove that surrounds its axial direction, and the annular groove is adapted to the spring 23, so that the spring 23 can be sleeved on the outside of the second end 22b of the wedge shaft 22, which can further improve the positioning accuracy of the spring 23.

[0056] Further, see attached document. Figure 3 and attached Figure 4 In a specific implementation, the outer diameter of the at least two claw springs 12 is smaller than the outer diameter of the connector 11; the second connector 2 further includes a push sleeve 24, which is coaxial with the connector 21 and fixed to the second end 21b of the connector 21; when the first connector 1 is connected to the second connector 2, and the first end 22a of the wedge shaft 22 is located in the contraction space, the end face of the push sleeve 24 away from the connector 21 is in contact with the end face of the connector 11; wherein, the outer diameters of the push sleeve 24, the connector 21 and the connector 11 are the same.

[0057] Specifically, to facilitate the processing of the second connector 2 and improve the elasticity of the claw spring 12, the technical solution adopted in this invention includes a push sleeve 24 for the second connector 2. The push sleeve 24 has an axially through structure and is connected to the second end 21b of the connecting body 21. The connection can be made by threaded connection. Specifically, the second end 21b of the connecting body 21 is a male threaded head, and the end of the push sleeve 24 connected to the connecting body 21 is a female threaded head. The outer diameter of the claw spring 12 of the first connector 1 is smaller than the outer diameter of the connecting head 11 and smaller than the inner diameter of the push sleeve 24. When the first connector 1 is connected to the first connector 21, the claw spring 12 of the first connector 1 moves from the inside of the push sleeve 24 to the first end 22a of the connecting body 21. After the first connector 1 and the second connector 2 are connected, the end face of the push sleeve 24 away from the connecting body 21 fits against the end face of the connecting head 11, and the outer diameters of the push sleeve 24, the connecting body 21 and the connecting head 11 are the same, so that the first connector 1 and the second connector 2 form a connector structure with the same outer diameter and continuous outer circumference.

[0058] Further, see attached document. Figure 3 and attached Figure 4 In a specific implementation, the connector 21 has a first disassembly hole 213 extending along its axial direction, and the wedge shaft 22 has a second disassembly hole 221 extending along its axial direction. The first disassembly hole 213 and the second disassembly hole 221 are circumferentially corresponding. When the first connector 1 is connected to the second connector 2, and the first end 22a of the wedge shaft 22 is located in the contraction space, at least the portion of the second disassembly hole 221 near the second end 22b is exposed in the first disassembly hole 213, and the axial distance between the edge of the second disassembly hole 221 near the second end 22b and the first disassembly hole 213 and its edge on the same side is not less than the axial length of the portion of the wedge shaft 22 located in the contraction space.

[0059] Specifically, to improve the ease of disassembly of the connecting structure, the technical solution adopted in this invention involves providing a first disassembly hole 213 extending axially on the connecting body 21 and a second disassembly hole 221 extending axially on the wedge shaft 22, with the circumferential positions of the first disassembly hole 213 and the second disassembly hole 221 corresponding. The axial positions and axial extension lengths of the first disassembly hole 213 and the second disassembly hole 221 need to be guaranteed. After the first connector 1 and the second connector 2 are connected, at least a portion of the second disassembly hole 221 near the second end 22b is exposed above the first disassembly hole 213, and the axial distance between the edge of the second disassembly hole 221 near the second end 22b and the edge of the first disassembly hole 213 on the same side is [not specified]. The distance is not less than the axial length of the portion of the wedge shaft 22 located within the contraction space; thus, during disassembly, the disassembly tool 3 is inserted into the first disassembly hole 213 and the portion of the second disassembly hole 221 exposed in the first disassembly hole 213, and a force is applied to the wedge shaft 22 toward the second end 21b of the connector 21. This force can overcome the elastic force of the spring 23 and move the wedge shaft 22 toward the second end 21b to disengage from the contraction space of the claw spring 12. At this time, a force is applied that causes the first connector 1 to move axially away from the second connector 2 relative to the second connector 2. The locking part 13 can overcome the elastic force of the claw spring 12 and disengage from the locking groove 211 of the connector 21, so that the first connector 1 is completely disengaged from the second connector 2, and the two sucker rods can be quickly disassembled.

[0060] The optimal one is shown in the attached document. Figure 3 and attached Figure 4 To facilitate the entry of the locking part 13 into the interior of the connector 21, the end face of the locking part 13 facing away from the connector 11 can be set as a first wedge-shaped inclined surface 131, and the end face of the second end 21b of the connector 21 and the end face of the locking groove 211 near the first end 21a can be set as a second wedge-shaped inclined surface 216 that is adapted to the first wedge-shaped inclined surface 131. Thus, the surface of the locking part 13 of the first connector 1 that contacts the connector 21 is an inclined surface, which can play a good guiding role and make the locking part 13 enter the connector 21 more quickly.

[0061] Ideally, when disassembling the first connector 1 and the second connector 2, to make it easier for the locking part 13 to disengage from the locking groove 211, the end face of the locking part 13 near the connector 11 can be set as a third wedge-shaped inclined surface 132, and the end face of the locking groove 211 near the second end 21b can be set as a fourth wedge-shaped inclined surface 2111 that matches the third wedge-shaped inclined surface 132. This allows the locking part 13 to disengage from the locking groove 211 more easily during disassembly.

[0062] Further, see attached document. Figure 3In a specific implementation, the connecting body 21 is provided with a pin hole 214 for installing a pin 215; the wedge shaft 22 is provided with a limiting groove 222 extending along its axial direction and corresponding to the pin hole 214 in its circumferential position, the end of the pin 215 extends into the limiting groove 222 and the diameter of its end is adapted to the circumferential dimension of the limiting groove 222 on the wedge shaft 22.

[0063] Specifically, to prevent the relative rotation of the connecting body 21 and the wedge shaft 22 from affecting the alignment of the first disassembly hole 213 and the second disassembly hole 221, the technical solution adopted in this invention is to open a pin hole 214 on the connecting body 21, which can be a blind hole, for installing a pin 215, and to open a limiting groove 222 extending axially on the wedge shaft 22. The pin hole 214 and the limiting groove 222 are circumferentially corresponding. The end of the pin 215 extends into the limiting groove 222. During the axial movement of the wedge shaft 22 relative to the connecting body 21, the end of the pin 215 moves axially within the limiting groove 222, which can restrict the relative rotation of the connecting body 21 and the wedge shaft 22.

[0064] Further, see attached document. Figure 5 and attached Figure 6 In a specific implementation, the sucker rod connection structure provided in this embodiment further includes a disassembly tool 3, which includes a disassembly head 31 and a handle 32. The disassembly head 31 includes a plug end 31a and a fixed end 31b facing away from each other. The plug end 31a is used to extend into the first disassembly hole 213 and the second disassembly hole 221 exposed in the first disassembly hole 213. The handle 32 is fixed to the fixed end 31b.

[0065] Specifically, to facilitate the disassembly of the sucker rod, the present invention provides a disassembly tool 3, which includes a disassembly head 31 and a handle 32. The fixed end 31b of the disassembly head 31 is used to install the handle 32. In use, the operator holds the handle 32 and inserts the plug end 31a of the disassembly head 31 into the first disassembly hole 213 and the second disassembly hole 221 exposed in the first disassembly hole 213. Then, a force is applied to the wedge shaft 22 toward the second end 21b of the connector 21. This force can overcome the elastic force of the spring 23 and move the wedge shaft 22 toward the second end 21b to disengage from the contraction space of the claw spring 12, thereby releasing the wedge shaft 22 from the restriction of the first connector 1, and thus further separating the first connector 1 and the second connector 2.

[0066] For details, please refer to 5 and the appendix. Figure 6The disassembly head 31 can be a flat plate structure with a thickness smaller than the width of the first disassembly hole 213 and the second disassembly hole 221. The width of the disassembly head 31 gradually decreases from the fixed end 31b to the plug end 31a, which makes it easy to insert the plug end 31a of the disassembly head 31 into the first disassembly hole 213 and the second disassembly hole 221, and also makes it easy for the operator to apply force.

[0067] Example 2

[0068] Embodiment 2 of the present invention provides a sucker rod string, which includes: a plurality of sucker rod connection structures as described in any one of claims 1-9; and a plurality of sucker rods, each sucker rod having a first connector 1 and a second connector 2 of the sucker rod connection structure respectively installed at both ends; the plurality of sucker rods are connected to each other through the first connector 1 and the second connector 2 to form the sucker rod string.

[0069] Specifically, the sucker rod string provided in this embodiment is formed by connecting the connecting rods through the above-mentioned sucker rod connection structure. The two ends of each sucker rod are respectively connected to the first connector 1 and the second connector 2. When the sucker rod is run into the well, the sucker rod is connected to the first connector 1 of another sucker rod down into the well through the second connector 2, which can realize a quick and reliable connection between the two sucker rods.

[0070] It should be noted that in the description of this specification, the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention; the terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0071] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0072] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A sucker rod connection structure, characterized in that, include: The first connector includes: a connector and at least two claw springs. The connector is used to connect one end of the sucker rod. The at least two claw springs are disposed at one end of the connector in the axial direction and are spaced apart in the circumferential direction to form a contraction space coaxial with the connector. Each claw spring has a locking part on the side away from the contraction space at the end away from the connector. The second connector includes a connecting body, a wedge shaft, and a spring. The connecting body is an axially through structure. Its first end is used to connect to the other end of the sucker rod, and its second end is used to mate with the first connector connected to another sucker rod. A locking groove is provided circumferentially on the inner wall of the connecting body near the second end. The wedge shaft is disposed in the connecting body, and the spring is disposed between the second end of the wedge shaft and the connecting body, so that the axial position of the wedge shaft in the connecting body is adjustable. The at least two claw springs of the first connector extend into the connector from the second end of the connector. During the process of the locking part of the at least two claw springs from the second end to the locking groove, the at least two claw springs are in a contracted state. When the locking part is located in the locking groove, the at least two claw springs are in a non-contracted state and the springs are in a compressed state, so as to hold the first end of the wedge shaft against the contracted space and the outer wall of the first end of the wedge shaft is close to the inner wall of the claw spring. Wherein, the first end and the second end are the two ends opposite to each other in the axial direction of the connecting body, the first end is the end of the wedge shaft away from the first end, and the second end is the end of the wedge shaft opposite to the first end in the circumferential direction.

2. The sucker rod connection structure according to claim 1, characterized in that, A limiting ring is provided circumferentially on the inner wall of the connector near the first end; The spring is disposed between the second end of the wedge shaft and the limiting ring.

3. The sucker rod connection structure according to claim 2, characterized in that, The outer diameter of the at least two claw springs is smaller than the outer diameter of the connector. The second connector also includes: A push sleeve is coaxial with the connecting body and fixed to the second end of the connecting body; When the first connector is connected to the second connector, and the first end of the wedge shaft is located within the contraction space, the end face of the push sleeve away from the connector body is in contact with the end face of the connector head; The outer diameters of the push sleeve, the connecting body, and the connecting head are the same.

4. The sucker rod connection structure according to claim 2 or 3, characterized in that, The connector has a first disassembly hole extending along its axial direction, and the wedge shaft has a second disassembly hole extending along its axial direction. The first disassembly hole and the second disassembly hole are circumferentially corresponding. When the first connector is connected to the second connector, and the first end of the wedge is located within the contraction space, at least a portion of the second disassembly hole near the second end is exposed in the first disassembly hole, and the axial distance between the edge of the second disassembly hole near the second end and the first disassembly hole and its edge on the same side is not less than the axial length of the portion of the wedge located within the contraction space.

5. The sucker rod connection structure according to claim 4, characterized in that, The connector has pin holes for installing pins; The wedge shaft has a limiting groove extending along its axial direction and corresponding to the pin hole in its circumferential position. The end of the pin extends into the limiting groove and the diameter of its end is adapted to the circumferential dimension of the limiting groove on the wedge shaft.

6. The sucker rod connection structure according to claim 1, characterized in that, The end face of the locking part facing away from the connector is a first wedge-shaped inclined surface; The end face of the second end of the connector and the end face of the locking groove near the first end are respectively second wedge-shaped inclined surfaces adapted to the first wedge-shaped inclined surface.

7. The sucker rod connection structure according to claim 1, characterized in that, The end face of the locking part near the connector is a third wedge-shaped inclined surface; The end face of the locking groove near the second end is a fourth wedge-shaped inclined surface that is adapted to the third wedge-shaped inclined surface.

8. The sucker rod connection structure according to claim 4, characterized in that, Also includes: A disassembly tool includes a disassembly head and a handle. The disassembly head includes a plug end and a fixed end facing away from each other. The plug end is used to extend into a first disassembly hole and a second disassembly hole exposed in the first disassembly hole. The handle is fixed to the fixed end.

9. The sucker rod connection structure according to claim 8, characterized in that, The disassembly head is a flat plate structure with a thickness smaller than the width of the first disassembly hole and the second disassembly hole, and the width of the disassembly head gradually decreases from the fixed end to the plug end.

10. A sucker rod string, characterized in that, include: Multiple sucker rod connection structures as described in any one of claims 1-9; Multiple sucker rods, with the first and second joints of the sucker rod connection structure respectively installed at both ends of each sucker rod; The multiple sucker rods are connected together via the first connector and the second connector to form the sucker rod string.

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