Sucker rod back-off method, sucker rod back-off tooth block and oil pipe hydraulic clamp

Abstract

The invention provides a sucker rod back-off method, a sucker rod back-off tooth block and an oil pipe hydraulic clamp, and belongs to the technical field of drill rod loading and unloading. The sucker rod back-off tooth block comprises a clamp tooth body and a fixing body, teeth are arranged on the clamp tooth body, and a positioning protrusion and an avoiding groove are arranged on the fixing body and matched with the positioning groove and the boss on the tooth base. The two sucker rod back-off tooth blocks which are symmetrically installed and matched with the two tooth bases are directly engaged to act on the sucker rod, then the oil pipe hydraulic clamp is started to drive the sucker rod back-off tooth blocks to rotate to achieve back-off operation of the sucker rod, the sleeving and fixing operation process of a semicircular pipe type back-off device in the prior art is omitted, and the labor intensity of workers is reduced. Only the oil pipe tooth block needs to be replaced by the sucker rod back-off tooth block, installation is convenient, safety and reliability are achieved, the labor intensity of workers is greatly relieved, back-off efficiency is high, the sucker rod back-off tooth block is matched with the tooth base and acts along with the tooth base, the slipping problem is avoided, and the back-off effect is better.

Description

Technical Field

[0001] The invention relates to a sucker rod inverted method, a sucker rod inverted tooth block and an oil pipe hydraulic pliers, belonging to the technical field of drill rod loading and unloading. Background Art

[0002] As the development and production of oil fields enters the middle and late stages, sand production in the strata becomes more and more serious. After entering the wellbore, the sucker rod or the oil pump piston will be buried in sand and stuck. At this time, the sucker rod needs to be reversed. The sucker rod reverse tools currently in use are relatively complicated. They mainly weld special sucker rod clips at both ends of the two-piece oil pipe short section, and then use the oil pipe hydraulic pliers to bite and rotate the two-piece oil pipe short section to reverse it.

[0003] The reason why the oil pipe hydraulic pliers are used to bite the oil pipe short joint to perform the reverse operation of the sucker rod is that there is no special sucker rod reverse tool in the prior art, and the existing oil pipe hydraulic pliers are used to clamp the oil pipe and perform related operations. The oil pipe hydraulic pliers include a jaw plate assembly, and the jaw plate assembly includes a tooth seat and an oil pipe tooth block installed on the tooth seat, and the oil pipe tooth block is dedicated to biting the oil pipe. For example, the Chinese utility model patent with the authorization announcement number CN210977351U discloses a jaw plate mechanism of a petroleum hydraulic pliers, including a jaw plate (i.e., a tooth seat) and two tooth plates (i.e., tooth blocks) installed on the tooth seat, two dovetail grooves (i.e., positioning grooves) are provided on the tooth seat, and the tooth block has a dovetail protrusion (i.e., positioning protrusion) matching the dovetail groove, and at the same time, the upper and lower ends of the tooth block are respectively provided with U-shaped grooves, and the upper and lower ends of the tooth seat are respectively provided with stop pins (i.e., elastic stop pins) extending into the U-shaped groove to prevent the tooth block from detaching from the tooth seat. The tooth block is provided with teeth, and a pair of jaw plate mechanisms are used in conjunction with the teeth to clamp the oil pipe.

[0004] As we all know, the outer diameter of the oil pipe is relatively large, so the oil pipe tooth block installed on the jaw plate of the oil pipe hydraulic pliers is relatively small, and a pair of jaw plates do not need to be aligned to the limit position to clamp the oil pipe. However, the outer diameter of the sucker rod is much smaller than that of the oil pipe, and even if the jaw plates of the oil pipe hydraulic pliers are aligned to the limit position, the oil pipe tooth block cannot clamp the sucker rod (the two jaw plates have opposite surfaces arranged relative to each other, and the oil pipe tooth block does not protrude from the opposite surface. When the jaw plates are aligned to the limit position, the opposite surfaces are in contact, and the oil pipe tooth block still cannot contact the sucker rod). This is the reason why the oil pipe tooth block is specifically used to bite the oil pipe. Therefore, if you want to use the oil pipe hydraulic pliers to realize the reverse operation of the sucker rod, you must set up an intermediate transition tool, that is, the sucker rod reverse tool composed of the above-mentioned oil pipe short section and the sucker rod clamp.

[0005] For example, the Chinese utility model patent with authorization announcement number CN2448911Y discloses a sucker rod buckle, which includes a shell I, a shell II and a connecting locking device. Shell I and shell II are both composed of an upper fixing block, a lower fixing block, a semicircular tube welded between the upper and lower fixing blocks, and a tooth block fixed to the upper and lower fixing blocks by a dovetail groove and a fixing screw. When in use, the sucker rod buckle is put on the sucker rod, and shell I and shell II are fixed together by a living bolt and a nut. The tooth block tightly bites the sucker rod, and the entire sucker rod buckle is connected to the sucker rod. Then the oil pipe hydraulic pliers are operated to bite the two semicircular tubes and rotate, thereby driving the sucker rod to rotate for unbuckling.

[0006] Because the above operation process needs to first open the sucker rod downturn and put it on and fix it on the outside of the sucker rod, and then operate the tubing hydraulic pliers to bite the sucker rod downturn, the operation process of putting on and fixing the downturn is relatively complicated, the manual labor intensity is large, and the tubing hydraulic pliers indirectly applies force to the sucker rod through the downturn, and the tubing hydraulic pliers clamp the semicircular tube of the downturn, which is easy to slip, and the downturn effect is not good. Summary of the invention

[0007] The purpose of the present invention is to provide a method for screwing down a sucker rod, so as to solve the problem that in the prior art, when a semi-circular tube screw-down device is used in conjunction with a tubing hydraulic pliers to realize the screw-down operation of a sucker rod, it is necessary to first complete the assembly and fixation of the screw-down device, and then control the tubing hydraulic pliers to bite the semi-circular tube of the screw-down device, resulting in complicated operation, high labor intensity and easy slipping; the purpose of the present invention is also to provide a sucker rod screw-down tooth block to solve the above problems; the purpose of the present invention is also to provide a tubing hydraulic pliers to solve the above problems.

[0008] To achieve the above purpose, the sucker rod inverted method of the present invention adopts the following technical scheme:

[0009] A sucker rod reverse threading method comprises the following steps: firstly, removing the oil pipe tooth blocks on two tooth seats of the oil pipe hydraulic pliers jaw assembly, and then using two sucker rod reverse thread blocks symmetrically installed with the two tooth seats to directly bite and act on the sucker rod, and then starting the oil pipe hydraulic pliers to drive the sucker rod reverse thread blocks to rotate to realize the sucker rod reverse threading operation.

[0010] The beneficial effect of the above technical solution is that the present invention proposes a pioneering sucker rod inverted method. Since the oil pipe tooth blocks provided by the oil pipe hydraulic pliers themselves cannot directly bite the sucker rod, the oil pipe tooth blocks on the two tooth seats of the oil pipe hydraulic pliers jaw assembly are first removed, and then two sucker rod inverted tooth blocks symmetrically installed with the two tooth seats are used to directly bite the sucker rod, which is equivalent to replacing new tooth blocks. The two new tooth blocks are installed in conjunction with the two tooth seats, and the tooth seat structure of the oil pipe hydraulic pliers itself is utilized, so that starting the oil pipe hydraulic pliers can drive the sucker rod inverted tooth blocks to rotate, thereby realizing the sucker rod inverted operation.

[0011] The sucker rod inverted thread method of the present invention eliminates the assembly and fixing operation process of the semi-circular tube inverted thread device in the prior art. It only needs to replace the oil pipe tooth block with the sucker rod inverted thread block to directly control the action of the oil pipe hydraulic clamp. The operation is relatively convenient and the labor intensity is greatly reduced. In addition, the sucker rod inverted thread block is matched with the thread seat and moves together with the thread seat, so there will be no slipping problem and the inverted thread effect is better.

[0012] Furthermore, the original elastic stop pin on the tooth seat cooperates with the insertion groove or the insertion hole on the sucker rod undercut tooth block to limit the sucker rod undercut tooth block on the tooth seat.

[0013] The beneficial effect of the above technical solution is that the elastic stop pin provided by the tooth seat itself can be used to simplify the structural setting, and facilitate the processing, manufacturing, installation and disassembly of the sucker rod inverted tooth block.

[0014] In order to achieve the above-mentioned purpose, the sucker rod undercut tooth block in the present invention adopts the following technical scheme:

[0015] A sucker rod undercut tooth block comprises a jaw body and a fixed body connected to the jaw body, wherein the jaw body is provided with teeth for biting the sucker rod; the fixed body is provided with two positioning protrusions, which are respectively inserted into two positioning grooves on a tooth seat of an oil pipe hydraulic pliers jaw assembly; an avoidance groove is provided on the fixed body between the two positioning protrusions, which is used to avoid a boss between the two positioning grooves on the tooth seat; the fixed body is also provided with a limiting structure for limiting the sucker rod undercut tooth block on the tooth seat.

[0016] The beneficial effect of the above technical scheme is that the present invention proposes a pioneering sucker rod reverse tooth block, which includes a clamp tooth body and a fixed body, and the teeth arranged on the clamp tooth body can directly bite the sucker rod; the two positioning protrusions on the fixed body cooperate with the two positioning grooves on the tooth seat of the oil pipe hydraulic pliers jaw assembly, and an avoidance groove is arranged on the fixed body between the two positioning protrusions, which can avoid the boss between the two positioning grooves on the tooth seat, so that the sucker rod reverse tooth block can be directly matched and installed on the tooth seat of the oil pipe hydraulic pliers jaw assembly, and a limiting structure is also arranged on the fixed body, which can limit the sucker rod reverse tooth block on the tooth seat, so that the sucker rod reverse tooth block can directly realize the biting, fixing and reverse operation of the sucker rod with the action of the oil pipe hydraulic pliers.

[0017] Therefore, the use of the sucker rod inverted tooth block of the present invention eliminates the installation and fixing operation process of the semi-circular tube type inverted tooth device in the prior art. When in use, the sucker rod inverted tooth block only needs to be installed on the tooth seat of the oil pipe hydraulic pliers jaw assembly to directly control the movement of the oil pipe hydraulic pliers. The operation is relatively convenient and the labor intensity is greatly reduced. In addition, the sucker rod inverted tooth block is matched with the tooth seat and moves together with the tooth seat. There will be no slipping problem and the inverted effect is better.

[0018] Furthermore, the upper and lower heights of the jaw body are smaller than the upper and lower heights of the fixed body, and the upper and lower ends of the fixed body extend out of the jaw body to form extended ends respectively, and the limiting structures are arranged on the extended ends at the upper and lower ends.

[0019] The beneficial effect of the above technical solution is that: by providing a special protruding end, the limiting structure only needs to be provided on the protruding end, and does not need to be provided on the forceps tooth body, which facilitates the processing and manufacturing of the limiting structure.

[0020] Furthermore, the limiting structure is an insertion groove or an insertion hole for the elastic stop pin originally installed on the tooth seat to extend into.

[0021] The beneficial effect of the above technical solution is that the limiting structure is an extension groove or an extension hole, which can cooperate with the original elastic stop pin on the tooth seat, thereby simplifying the structural setting and facilitating the processing, manufacturing, installation and disassembly of the sucker rod inverted tooth block.

[0022] Furthermore, the cross-section of the clamp tooth body is fan-shaped, and the clamp tooth body includes a small arc surface, a large arc surface, and a straight surface respectively connected between the circumferential ends of the small arc surface and the large arc surface. The large arc surface is connected to the fixed body, and the teeth are arranged on the small arc surface.

[0023] The beneficial effects of the above technical solution are: it is convenient to set the teeth to bite the sucker rod, and it is convenient to connect with the fixed body to achieve installation on the tooth seat. The structure of the clamp tooth body is simple and compact, and it is convenient to process and manufacture.

[0024] Furthermore, the radial thickness of the forceps body is more than 3 times the radial thickness of the fixing body.

[0025] The beneficial effect of the above technical solution is that the jaw body is thicker, which makes it easier for the teeth to bite the sucker rod tightly and realize the inverted operation of the sucker rod.

[0026] Furthermore, the positioning protrusion is in a dovetail shape.

[0027] The beneficial effects of the above technical solution are: good limiting effect and high connection strength.

[0028] To achieve the above purpose, the oil pipe hydraulic pliers in the present invention adopt the following technical solutions:

[0029] A tubing hydraulic pliers, comprising a jaw plate assembly, the jaw plate assembly comprising two symmetrically arranged tooth seats, the two tooth seats having opposite surfaces arranged oppositely, each tooth seat being provided with two positioning grooves, the tubing hydraulic pliers further comprising four tubing tooth blocks for being detachably mounted in each positioning groove when biting the tubing, the tubing hydraulic pliers further comprising two sucker rod inverted tooth blocks, each sucker rod inverted tooth block being detachably mounted in two positioning grooves of a tooth seat when biting the tubing, the sucker rod inverted tooth block comprising a clamp tooth body and a clamp tooth body A connected fixed body, the jaw body is provided with teeth for biting the sucker rod, and the teeth protrude from the opposite surface of the tooth seat; the fixed body is provided with two positioning protrusions, and the two positioning protrusions are used to respectively fit into two positioning grooves on the tooth seat of the oil pipe hydraulic pliers jaw assembly, and an avoidance groove is provided on the fixed body between the two positioning protrusions, and the avoidance groove is used to avoid the boss between the two positioning grooves on the tooth seat; the fixed body is also provided with a limiting structure for limiting the inverted tooth block of the sucker rod on the tooth seat.

[0030] The beneficial effect of the above technical solution is that the present invention provides an improved oil pipe hydraulic pliers, which not only includes an oil pipe tooth block that can be detachably installed in each positioning groove when biting the oil pipe, but also includes a sucker rod reverse tooth block that can be detachably installed in two positioning grooves of a tooth seat when biting the sucker rod, and the sucker rod reverse tooth block includes a clamp tooth body and a fixed body, and the teeth arranged on the clamp tooth body protrude from the opposite surface of the tooth seat, and can directly bit the sucker rod; the two positioning protrusions on the fixed body are connected to the oil pipe hydraulic The two positioning grooves on the tooth seat of the jaw assembly cooperate with each other, and an avoidance groove is provided on the fixed body between the two positioning protrusions, which can avoid the boss between the two positioning grooves on the tooth seat, so that the sucker rod inverted tooth block can be directly mounted on the tooth seat of the oil pipe hydraulic pliers jaw assembly, and a limiting structure is also provided on the fixed body, which can limit the sucker rod inverted tooth block on the tooth seat, so that the sucker rod inverted tooth block can directly realize the bite fixation and inverted operation of the sucker rod with the action of the oil pipe hydraulic pliers.

[0031] Therefore, the use of the oil pipe hydraulic pliers of the present invention eliminates the installation and fixing operation process of the semi-circular tube type undercut device in the prior art. When in use, it is only necessary to install the sucker rod undercut tooth block on the tooth seat of the oil pipe hydraulic pliers jaw assembly to directly control the movement of the oil pipe hydraulic pliers. The operation is relatively convenient and the labor intensity is greatly reduced. In addition, the sucker rod undercut tooth block is matched with the tooth seat and moves together with the tooth seat, so there will be no slipping problem and the undercut effect is better.

[0032] Furthermore, the upper and lower heights of the jaw body are smaller than the upper and lower heights of the fixed body, and the upper and lower ends of the fixed body extend out of the jaw body to form extended ends respectively, and the limiting structures are arranged on the extended ends at the upper and lower ends.

[0033] The beneficial effect of the above technical solution is that: by providing a special protruding end, the limiting structure only needs to be provided on the protruding end, and does not need to be provided on the forceps tooth body, which facilitates the processing and manufacturing of the limiting structure.

[0034] Furthermore, elastic stop pins are installed at both ends of each positioning groove on the tooth seat, and the elastic stop pins are used to extend into the limiting groove of the oil pipe tooth block to limit the oil pipe tooth block. The limiting structure is an insertion groove or insertion hole for the elastic stop pin to extend into.

[0035] The beneficial effect of the above technical solution is that the limiting structure is an extension groove or an extension hole, which can cooperate with the original elastic stop pin on the tooth seat, thereby simplifying the structural setting and facilitating the processing, manufacturing, installation and disassembly of the sucker rod inverted tooth block.

[0036] Furthermore, the cross-section of the clamp tooth body is fan-shaped, and the clamp tooth body includes a small arc surface, a large arc surface, and a straight surface respectively connected between the circumferential ends of the small arc surface and the large arc surface. The large arc surface is connected to the fixed body, and the teeth are arranged on the small arc surface.

[0037] The beneficial effects of the above technical solution are: it is convenient to set the teeth to bite the sucker rod, and it is convenient to connect with the fixed body to achieve installation on the tooth seat. The structure of the clamp tooth body is simple and compact, and it is convenient to process and manufacture.

[0038] Furthermore, the radial thickness of the forceps body is more than 3 times the radial thickness of the fixing body.

[0039] The beneficial effect of the above technical solution is that the jaw body is thicker, which makes it easier for the teeth to bite the sucker rod tightly and realize the inverted operation of the sucker rod.

[0040] Furthermore, the positioning protrusion is in a dovetail shape.

[0041] The beneficial effects of the above technical solution are: good limiting effect and high connection strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1It is a top view of the undercut tooth block of the sucker rod in the oil pipe hydraulic pliers of the present invention;

[0043] Figure 2 It is a front view of the undercut tooth block of the sucker rod in the oil pipe hydraulic pliers of the present invention;

[0044] Figure 3 It is a top view of the jaw assembly in the oil pipe hydraulic pliers of the present invention.

[0045] In the figure: 1. jaw body; 101. jaw body; 102. teeth; 2. fixing body; 201. positioning protrusion; 202. extending groove; 203. avoidance groove; 3. jaw assembly; 4. tooth seat; 401. positioning groove; 402. boss; 403. opposite surface; 5. elastic stop pin; 6. sucker rod. DETAILED DESCRIPTION

[0046] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0047] Embodiment 1 of the oil pipe hydraulic pliers of the present invention:

[0048] The present embodiment proposes an improved oil pipe hydraulic pliers, which includes, in addition to oil pipe tooth blocks that can be detachably installed in each positioning groove when biting the oil pipe, the oil pipe hydraulic pliers also include sucker rod reverse tooth blocks that can be detachably installed in two positioning grooves of a tooth seat when biting the sucker rod. By replacing the matching sucker rod reverse tooth blocks, the action of the oil pipe hydraulic pliers can be directly controlled to achieve the biting, fixing and reverse operation of the sucker rod, eliminating the set fixing operation process of the semi-circular tube reverse device in the prior art, making the operation more convenient, greatly reducing the labor intensity, and without slipping problems, and the reverse effect is better.

[0049] Specific as Figure 3 As shown, the oil pipe hydraulic pliers include a jaw plate assembly 3, which includes two symmetrically arranged tooth seats 4, the two tooth seats 4 have opposite surfaces 403 arranged relatively, and each tooth seat 4 is provided with two positioning grooves 401, the positioning grooves 401 are dovetail grooves, and a boss 402 is formed between the two positioning grooves 401 on the tooth seat 4. The oil pipe hydraulic pliers also include four oil pipe tooth blocks (not shown in the figure) for detachably installing in each positioning groove 401 when biting the oil pipe. The oil pipe tooth blocks are small in size and are used to bite the oil pipe with a relatively large diameter. Elastic stop pins 5 are respectively installed at the upper and lower ends of each positioning groove 401 on the tooth seat 4. The elastic stop pins 5 belong to the original stop pins of the tooth seat 4, and their function is to extend into the limiting groove of the oil pipe tooth block to limit the oil pipe tooth block, and also realize the detachable installation of the oil pipe tooth block. This part belongs to the prior art, and the jaw plate mechanism disclosed in the patent document CN210977351U can be specifically referred to, and will not be described in detail in the present invention.

[0050] The tubing hydraulic pliers also include two sucker rod undercut tooth blocks, each sucker rod undercut tooth block is used to be detachably mounted in two positioning grooves 401 of a tooth seat 4 when the sucker rod 6 is bitten. Figure 1 , Figure 2 and Figure 3 As shown, each sucker rod inverted tooth block includes a clamp tooth body 1 and a fixed body 2 connected to the clamp tooth body 1. The clamp tooth body 1 is composed of a clamp tooth body 101 and teeth 102. The clamp tooth body 101 is a fan-shaped structure, and its cross section is fan-shaped. Therefore, the clamp tooth body 101 includes a small arc surface, a large arc surface, and a flat surface connected between the circumferential ends of the small arc surface and the large arc surface. The large arc surface is connected to the fixed body 2, and the teeth 102 are arranged on the small arc surface. In addition, the teeth 102 are axial sawtooth buckle type, matched with the sucker rod 6, with the tooth tip facing outward, and arc-shaped distributed in the middle of the front side of the clamp tooth body 101. The teeth 102 are quenched and carburized, and the hardness is higher than that of the sucker rod 6.

[0051] Two positioning protrusions 201 are arranged on the fixed body 2, and the two positioning protrusions 201 are symmetrically arranged on the back side of the clamp tooth body 101. The positioning protrusions 201 extend in the up-down direction, and the extension direction is perpendicular to the radial direction of the clamp tooth body 101, and the symmetry plane of the tooth 102 as a whole and the symmetry plane of the two positioning protrusions 201 are coplanar. The two positioning protrusions 201 are both dovetail-shaped, and the size and shape match the positioning grooves 401 on the tooth seat 4. They can be respectively inserted into the two positioning grooves 401 of the tooth seat 4 to achieve the left and right limit fixation of the sucker rod undercut tooth block and ensure the transmission of the undercut rotation button torque.

[0052] An avoidance groove 203 is provided between the two positioning protrusions 201 on the fixed body 2. The avoidance groove 203 is a through groove that passes through the fixed body 2 from top to bottom, and its size and shape match the boss 402 on the tooth seat 4. When the positioning protrusion 201 is inserted into the positioning groove 401, the boss 402 can be avoided, so that the positioning protrusion 201 can be smoothly inserted, that is, it is ensured that the sucker rod inverted tooth block can be smoothly installed on the tooth seat 4.

[0053] The fixed body 2 is also provided with a limiting structure for limiting the sucker rod undercut tooth block on the tooth seat 4, as shown in FIG. Figure 2As shown, the upper and lower heights of the clamp tooth body 1 are smaller than the upper and lower heights of the fixed body 2, and the upper and lower ends of the fixed body 2 extend out of the clamp tooth body 1 to form extended ends respectively. The above-mentioned limit structure is arranged on the extended ends at the upper and lower ends, and is an insertion groove 202 for the elastic stop pin 5 originally installed on the tooth seat 4 to extend into. The insertion groove 202 is a U-shaped groove. Four insertion grooves 202 are arranged on a sucker rod inverted tooth block, which are respectively located in the middle position of the upper and lower ends of the positioning protrusion 201, that is, the number and position of the insertion grooves 202 match the number and position of the elastic stop pin 5 originally installed on the tooth seat 4, so as to directly use the original elastic stop pin 5 to realize the upper and lower limit fixation of the sucker rod inverted tooth block. Of course, the elastic stop pin 5 also realizes the detachable installation of the sucker rod inverted tooth block.

[0054] In addition, if Figure 1 As shown, the radial thickness of the forceps body 101 is 5 times the radial thickness of the fixing body 2, that is, the forceps body 101 has a larger radial thickness, so that the teeth 102 can be as close to the center position as possible, as shown in FIG. Figure 3 As shown, the teeth 102 protrude far from the opposite surface 403 of the tooth seat 4. The reason is that when the sizes of the two positioning protrusions 201 and the avoidance groove 203 are determined, that is, when the size of the large arc surface of the jaw body 101 is determined, the larger the radial thickness, the smaller the size of the small arc surface, thereby ensuring that the teeth 102 can bite the sucker rod 6 with a relatively small diameter.

[0055] The working principle of the oil pipe hydraulic pliers in the present invention is as follows:

[0056] Under normal circumstances, the two tooth seats 4 of the jaw assembly 3 of the tubing hydraulic pliers are installed with tubing tooth blocks, which are used to bite the tubing for loading and unloading operations. When the oil well is stuck by sand in the oil field development and the sucker rod 6 needs to be reversed, the four tubing tooth blocks used for loading and unloading the tubing in the main pliers of the on-site tubing hydraulic pliers are first removed, and then the positioning protrusions 201 of the two sucker rod reverse tooth blocks of the present invention are vertically installed in the two positioning grooves 401 of the tooth seat 4 in front of the jaw assembly 3 of the tubing hydraulic pliers. At this time, the avoidance groove 203 just cooperates with the boss 402 between the two positioning grooves 401 of the tooth seat 4, and the sucker rod reverse tooth block of the present invention is continuously pushed vertically downward until the insertion grooves 202 at both ends are stuck between the upper and lower elastic stop pins 5 in the two positioning grooves 401 in front of the tooth seat 4 for limiting. Figure 3 As shown, the two sucker rod reverse tooth blocks of the present invention are symmetrically arranged after installation. When in use, the reversed sucker rod 6 is placed in the middle of the oil pipe hydraulic pliers, and the main hydraulic pliers are started according to the hydraulic pliers operating procedures. The hydraulic pliers drive the jaw assembly 3 to rotate, so that the teeth 102 of the sucker rod reverse tooth block of the present invention bite the sucker rod 6 to rotate, thereby realizing the reverse operation of the stuck sucker rod.

[0057] Embodiment 1 of the sucker rod inverting method of the present invention:

[0058] The sucker rod reverse thread method of the present invention needs to use the tubing hydraulic pliers in the above-mentioned embodiment, so the specific implementation process is also the working process of the above-mentioned tubing hydraulic pliers, including first removing the tubing tooth blocks on the two tooth seats of the tubing hydraulic pliers jaw assembly, and then using the two sucker rod reverse thread blocks symmetrically installed with the two tooth seats to directly bite and act on the sucker rod, and then starting the tubing hydraulic pliers to drive the sucker rod reverse thread blocks to rotate to achieve the sucker rod reverse thread operation. As described in the embodiment of the tubing hydraulic pliers, when installing the sucker rod reverse thread block, the original elastic stop pin on the tooth seat is used to cooperate with the extension groove on the sucker rod reverse thread block to limit the sucker rod reverse thread block on the tooth seat.

[0059] The sucker rod inverted thread method of the present invention eliminates the installation and fixing operation process of the semi-circular tube inverted thread device in the prior art. It only needs to replace the oil pipe tooth block with the sucker rod inverted thread block. The installation is convenient and the action of the oil pipe hydraulic clamp can be directly controlled. The operation is relatively convenient, safe and reliable, and the labor intensity is greatly reduced. The inverted thread efficiency is high. The sucker rod inverted thread block is matched with the thread seat. They move together with the thread seat, so there will be no slipping problem and the inverted thread effect is better.

[0060] Embodiment 2 of the sucker rod inverted threading method of the present invention: This embodiment provides a different matching structure between the sucker rod inverted threading block and the elastic stop pin. Unlike Embodiment 1 of the inverted threading method, an insertion hole is processed on the sucker rod inverted threading block instead of an insertion groove, which can also allow the elastic stop pin originally installed on the thread seat to extend into, thereby realizing the upper and lower limit positions of the sucker rod inverted threading block.

[0061] Embodiment 3 of the sucker rod inverted threading method of the present invention: This embodiment provides different limiting methods for the sucker rod inverted threading block. Different from Embodiment 1 of the inverted threading method, the sucker rod inverted threading block is not limited by extending into a groove or an extending into a hole, but is fixed to the thread seat by a separate screw.

[0062] Embodiment 2 of the oil pipe hydraulic pliers in the present invention: This embodiment provides a different matching structure between the sucker rod inverted tooth block and the elastic stop pin. Unlike Embodiment 1 of the oil pipe hydraulic pliers, the sucker rod inverted tooth block is processed with an insertion hole instead of an insertion groove, which can also allow the original elastic stop pin on the tooth seat to extend into, thereby realizing the upper and lower limit of the sucker rod inverted tooth block.

[0063] Embodiment 3 of the oil pipe hydraulic pliers in the present invention: This embodiment provides different limiting methods for the sucker rod undercut tooth block. Different from Embodiment 1 of the oil pipe hydraulic pliers, the sucker rod undercut tooth block is not limited by extending into the groove or the extension hole, but is fixed to the tooth seat by a separate screw.

[0064] Embodiment 4 of the oil pipe hydraulic pliers of the present invention: This embodiment provides different shapes of positioning protrusions and positioning grooves. Different from Embodiment 1 of the oil pipe hydraulic pliers, the positioning protrusions and positioning grooves are both T-shaped.

[0065] Embodiment 5 of the hydraulic oil pipe clamp of the present invention: This embodiment provides different proportional relationships between the radial thickness of the jaw body and the radial thickness of the fixed body. Unlike the embodiment 1 of the hydraulic oil pipe clamp, the radial thickness of the jaw body is 4 times the radial thickness of the fixed body. Of course, in other embodiments, it can also be 3 times, and of course it can also be 2 times, as long as the teeth of the sucker rod undercut tooth block protrude from the opposite surface of the tooth seat where it is located and can bite the sucker rod tightly.

[0066] Embodiment 6 of the oil pipe hydraulic pliers of the present invention: This embodiment provides different shapes of the jaws. Unlike Embodiment 1 of the oil pipe hydraulic pliers, the cross-section of the jaws can also be rectangular. In this case, the overall cross-section of the jaws and the fixed body is roughly T-shaped.

[0067] Embodiment 7 of the oil pipe hydraulic pliers in the present invention: This embodiment provides different structural shapes of the fixed body. Different from Embodiment 1 of the oil pipe hydraulic pliers, the upper and lower ends of the fixed body are flush with the upper and lower ends of the jaw body, respectively. At this time, the limiting structure is simultaneously arranged on the jaw body and the fixed body.

[0068] The embodiment of the sucker rod undercut tooth block in the present invention is as follows: the specific structure of the sucker rod undercut tooth block is the same as the sucker rod undercut tooth block in any embodiment of the above-mentioned tubing hydraulic pliers, and will not be repeated here.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A method for inverting a sucker rod, characterized in that: First, the oil pipe tooth blocks on the two tooth seats (4) of the oil pipe hydraulic pliers jaw assembly (3) are removed, and then two sucker rod reverse tooth blocks symmetrically installed with the two tooth seats (4) are used to directly bite and act on the sucker rod (6), and then the oil pipe hydraulic pliers are started to drive the sucker rod reverse tooth blocks to rotate to achieve the sucker rod (6) reverse operation.

2. The method for inverting a sucker rod according to claim 1, characterized in that: The original elastic stop pin (5) on the tooth seat (4) cooperates with the insertion groove (202) or the insertion hole on the sucker rod undercut tooth block to limit the sucker rod undercut tooth block on the tooth seat (4).

3. A sucker rod undercut tooth block, characterized in that: The invention comprises a jaw body (1) and a fixed body (2) connected to the jaw body (1); the jaw body (1) is provided with teeth (102) for gripping a sucker rod (6); the fixed body (2) is provided with two positioning protrusions (201), the two positioning protrusions (201) are used to respectively snap into two positioning grooves (401) on a tooth seat (4) of an oil pipe hydraulic jaw assembly (3); an avoidance groove (203) is provided on the fixed body (2) between the two positioning protrusions (201), the avoidance groove (203) is used to avoid a boss (402) between the two positioning grooves (401) on the tooth seat (4); the fixed body (2) is also provided with a limiting structure for limiting the sucker rod inverted tooth block on the tooth seat (4).

4. The sucker rod undercut tooth block according to claim 3, characterized in that: The upper and lower heights of the clamp body (1) are smaller than the upper and lower heights of the fixed body (2); the upper and lower ends of the fixed body (2) extend out of the clamp body (1) to form extended ends respectively; and the limiting structures are arranged on the extended ends at the upper and lower ends.

5. The sucker rod undercut tooth block according to claim 3 or 4, characterized in that: The limiting structure is an insertion groove (202) or an insertion hole for the elastic stop pin (5) originally installed on the tooth seat (4) to extend into.

6. The sucker rod undercut tooth block according to claim 3 or 4, characterized in that: The cross section of the clamp tooth body (1) is fan-shaped, and the clamp tooth body (1) comprises a small arc surface, a large arc surface, and flat surfaces respectively connected between the circumferential ends of the small arc surface and the large arc surface, the large arc surface is connected to the fixed body (2), and the teeth (102) are arranged on the small arc surface.

7. The sucker rod undercut tooth block according to claim 6, characterized in that: The radial thickness of the forceps body (1) is more than three times the radial thickness of the fixing body (2).

8. The sucker rod undercut tooth block according to claim 3 or 4, characterized in that: The positioning protrusion (201) is in a dovetail shape.

9. A hydraulic pliers for oil pipes, comprising a jaw assembly (3), the jaw assembly (3) comprising two symmetrically arranged tooth seats (4), the two tooth seats (4) having oppositely arranged opposing surfaces (403), each tooth seat (4) being provided with two positioning grooves (401), the hydraulic pliers for oil pipes further comprising four oil pipe tooth blocks for being detachably mounted in each positioning groove (401) when tightening the oil pipe, characterized in that: The tubing hydraulic pliers further comprise two sucker rod inverted tooth blocks, each sucker rod inverted tooth block being used to be removably installed in two positioning grooves (401) of a tooth seat (4) when the sucker rod (6) is tightened, the sucker rod inverted tooth block being the sucker rod inverted tooth block as claimed in any one of claims 3 to 8, and the teeth (102) of the sucker rod inverted tooth block protruding from the opposite surface (403) of the tooth seat (4) where it is located.

10. The oil pipe hydraulic pliers according to claim 9, characterized in that: Elastic stop pins (5) are respectively installed at both ends of each positioning groove (401) on the tooth seat (4), and the elastic stop pins (5) are used to extend into the limiting groove of the oil pipe tooth block to limit the oil pipe tooth block.

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