CN113530475A

CN113530475A - Positioning mechanism, positioning seat, alignment mechanism and workover rig for workover rig

Info

Publication number: CN113530475A
Application number: CN202110805466.9A
Authority: CN
Inventors: 王新明; 倪晋杰; 范竹刚; 朱可
Original assignee: Wuxi Zhihan Intelligent Machine Technology Co ltd
Current assignee: Wuxi Zhihan Intelligent Machine Technology Co ltd
Priority date: 2021-07-16
Filing date: 2021-07-16
Publication date: 2021-10-22
Anticipated expiration: 2041-07-16
Also published as: CN113530475B

Abstract

The invention relates to a positioning mechanism and a positioning seat for a workover rig, an alignment mechanism comprising the positioning mechanism and the positioning seat, and the workover rig comprising the alignment mechanism. Wherein positioning mechanism sets up on moving the fortune frame and including the location body and from the outstanding location head of shoulder, and the location body is including the shoulder that is used for the location to the location head includes locating surface and the side locating surface of two oppositions down, and the positioning seat setting is formed with the constant head tank in the pedestal on the well head equipment and including the pedestal, and the constant head tank includes the side locating surface of bottom locating surface and two oppositions, and the pedestal still includes the terminal surface that is located the entrance of constant head tank. The positioning surface and the shoulder of the positioning mechanism are matched with the positioning surface and the end surface of the positioning seat, so that accurate and quick alignment and positioning of the moving and transporting frame relative to wellhead equipment are realized, automatic moving and transporting of the oil pumping pipe/rod can be realized, manual operation is not needed in the moving and transporting process, labor force is saved, efficiency is improved, and the automation degree of the workover rig is improved.

Description

Positioning mechanism, positioning seat, alignment mechanism and workover rig for workover rig

Technical Field

The invention relates to a positioning mechanism, a positioning seat and an alignment mechanism for a workover rig and the workover rig comprising the positioning mechanism, the positioning seat or the alignment mechanism. In particular, the present invention relates to a mechanism for quickly positioning, aligning and installing a transfer frame for transferring a sucker rod or pipe in a workover rig with wellhead equipment disposed at a wellhead, and a workover rig including the same.

Background

In the operation of a workover rig, the tubing and/or sucker rod is first moved into the location or clamping device of the wellhead equipment during lowering of the tubing and/or sucker rod, which in conventional workover rigs is done by manually pulling the tubing/rod, manually clamping one end of the tubing/rod to an elevator, and manually moving the other end of the tubing/rod to the wellhead equipment and into alignment with the location or clamping device after the one end of the tubing/rod is lifted by the elevator. The tubing and/or sucker rods also need to be manually removed from the elevator and from the equipment at the wellhead during the tripping of the tubing and/or sucker rods out of the well. For the manual operation mode, the labor intensity of operators is high, the operation environment is severe, the field operation environment has certain risks, the safety of oilfield operation is affected, and the operation efficiency is very low.

Therefore, how to automatically move the pumping pipe and/or the sucker rod away from the wellhead equipment or automatically move the sucker rod or the pumping pipe to the wellhead equipment and align the sucker rod or the pumping pipe with the positioning or clamping device of the wellhead equipment is a problem to be solved in the field.

The present invention is directed to solving the above-mentioned problems and/or other problems in the prior art.

Disclosure of Invention

The invention provides a positioning mechanism for a well servicing rig, the well servicing rig comprising a transfer frame for automatically transferring a sucker rod or a sucker rod, the positioning mechanism being arranged on the transfer frame, wherein the positioning mechanism comprises a positioning body and a positioning head protruding from the shoulder, wherein the positioning body comprises the shoulder for positioning, and the positioning head comprises a lower positioning face and two opposite side positioning faces extending substantially perpendicular to the lower positioning face.

The invention also provides a positioning seat used for the workover rig in cooperation with the positioning mechanism, the workover rig comprises wellhead equipment arranged on a wellhead, and the positioning seat is arranged on the wellhead equipment, wherein the positioning seat comprises a seat body, a positioning groove is formed in the seat body, the positioning groove comprises a bottom positioning surface and two opposite side positioning surfaces extending basically perpendicular to the bottom positioning surface, and the seat body further comprises an end surface used for positioning and positioned at an inlet of the positioning groove.

The present invention further provides an alignment mechanism for a workover rig comprising a wellhead equipment disposed at a wellhead and a transfer frame for automatically transferring a sucker rod or sucker rod tubing to and/or from the wellhead equipment, wherein the alignment mechanism comprises a positioning mechanism disposed on the transfer frame and a positioning socket disposed on the wellhead equipment, the positioning mechanism and the positioning socket cooperating to effect alignment of the transfer frame with the wellhead equipment.

The invention also provides a workover rig comprising a wellhead equipment arranged at a wellhead and a transfer frame for automatically transferring a sucker rod or sucker rod tubing to and/or from the wellhead equipment, the workover rig further comprising an alignment mechanism according to the above.

The invention has the advantages that the positioning surface and the shoulder part of the positioning mechanism are matched with the positioning surface and the end surface in the positioning seat, so that the moving frame is accurately aligned and positioned relative to wellhead equipment, the moving frame can be ensured to be accurately clamped to the oil pumping pipe/rod to move the oil pumping pipe/rod and/or accurately move the oil pumping pipe/rod into the positioning/clamping device of the wellhead equipment, the automatic moving of the oil pumping pipe/rod is smoothly realized, the moving process does not need manual operation any more, the labor force is saved, the efficiency is improved, the automation degree of the workover rig is improved, and the invention has important significance for improving the working efficiency, particularly realizing the automation of the whole workover rig working process. And the positioning mechanism and the positioning seat can realize quick connection and alignment of the transfer frame and wellhead equipment by a simple structure. And the arrangement of the slewing bearing assembly allows the lower locating surface of the locating head of the locating mechanism to still abut against the bottom locating surface of the locating seat even if the transfer frame is inclined, i.e. accurate location of the transfer frame relative to the wellhead equipment can still be achieved, and stress in the locating mechanism caused by hard twisting of the swing arm assembly of the locating mechanism is avoided.

Drawings

FIG. 1 illustrates a partial perspective view of a workover rig employing a positioning mechanism, a positioning shoe, and an alignment mechanism according to an exemplary embodiment of the present disclosure at the alignment mechanism;

FIG. 2 illustrates a perspective view of a positioning mechanism according to an exemplary embodiment; and is

Fig. 3 shows a perspective view of a positioning socket according to an exemplary embodiment.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept and should not be construed as limiting the invention.

Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It may be evident, however, that one or more embodiments may be practiced without these specific details. In order to simplify the drawings, well-known structures and devices are not shown in the drawings.

Fig. 1 shows a perspective view of a part of a workover rig at an alignment facility, to which a positioning mechanism, a positioning stand and an alignment facility according to an exemplary embodiment of the present invention are applied, wherein only a part of the structure of the workover rig related to the alignment facility is shown, and the rest of the workover rig, such as an elevator for hoisting a pump string/rod, etc., is not shown.

In order to solve the problems of high labor intensity, severe operation environment, poor safety and low operation efficiency in the manual operation process, the invention provides a workover rig which can automatically realize the moving and transporting of an oil pumping pipe/an oil pumping rod through a moving and transporting frame 10. Specifically, during lowering of the pump string or rod downhole, the transfer frame 10 grips the rod or rod (not shown) and automatically transfers it to the wellhead equipment 20 and aligns the wellhead equipment's pipe/rod positioning/gripping device, after which the upper end of the pipe/rod is gripped by the elevator, the transfer frame 10 releases the pipe/rod, the transfer of the pipe/rod is completed, and the transfer frame 10 continues to move to grab the next pipe/rod or to its initial position. While in the process of tripping a pump string or sucker rod out of the well, after the pipe/rod is tripped out of the well (i.e. disconnected from the downhole pipe/rod), the transfer frame 10 grips the pipe/rod, the elevator releases the pipe/rod, the transfer frame 10 moves the pipe/rod away from the wellhead and moves it, for example, into a pipe/rod magazine.

In order to achieve the above-described automated transfer process, it must be ensured that when the equipment making up the workover rig is initially installed and deployed at the wellhead, the transfer frame 10 is positionally aligned with the wellhead equipment 20 to ensure that the gripping means for the pipe/rod in the transfer frame 10, when moved to the wellhead, for example with the swing arm of the transfer frame 10, it is possible to interface with the location/gripping device at the wellhead 20, and the elevator, or else the pipe/rod cannot be gripped accurately, or the gripping device for the pipe/rod in the transfer frame 10 carries the pipe/rod while swinging to the wellhead with e.g. the swing arm of the transfer frame 10, the tubing/string positioning/gripping device of the wellhead 20 and the elevator cannot be aligned, without the pipe/string being successfully handed over to the positioning/clamping device and elevator of the wellhead 20. It can be seen that in order to achieve automatic pipe/rod transfer, it is necessary to ensure alignment and accurate relative positioning of the transfer frame 10 and wellhead 20 during initial deployment, installation of the workover rig. By way of example, the wellhead assembly 20 may be configured as a modular wellhead module such that upon installation, the wellhead module is positioned directly at the wellhead to reduce complex installation operations on portions of the wellhead assembly upon installation. However, those skilled in the art will appreciate that the wellhead 20 may not be constructed as modular.

To this end, the present invention provides a positioning mechanism 1 provided on a transfer frame 10 and a positioning socket 2 provided on a wellhead 20, both of which are cooperatively used simultaneously to achieve alignment of the transfer frame 10 with said wellhead 20.

As an exemplary embodiment, the present invention provides a positioning mechanism for a well servicing machine comprising a transfer frame 10 for automatically transferring a sucker rod or oil pumping pipe, the positioning mechanism being arranged on the transfer frame 10, wherein the positioning mechanism 1 comprises a positioning body 12 and a positioning head 11, wherein the positioning body 12 comprises a shoulder 121 for positioning and the positioning head 11 comprises a lower positioning face 111 and two opposing side positioning faces 112 extending substantially perpendicular to the lower positioning face 111. The positioning and alignment of the transfer frame 10 is achieved by the positioning means 1 arranged on the transfer frame 10, in particular the shoulder 121, the lower positioning surface 111 and the side positioning surfaces 112 thereof.

As an exemplary embodiment, the present invention provides a positioning socket for a workover rig, the workover rig including a wellhead equipment 20 arranged at a wellhead, the positioning socket being provided on the wellhead equipment 20, wherein the positioning socket 2 includes a socket body 21, a positioning slot being formed in the socket body 21, wherein the positioning slot includes a bottom positioning surface 211 and two opposite side positioning surfaces 212 extending substantially perpendicular to the bottom positioning surface 211, the socket body further including an end surface 213 for positioning located at an entrance of the positioning slot. In this example, the positioning and alignment of the wellhead 20 is achieved by a positioning socket 2 provided on the wellhead 20, in particular a positioning slot in its housing 21.

As an exemplary embodiment, the present invention provides an alignment mechanism for a workover rig including a wellhead equipment 20 disposed at a wellhead and a transfer frame 10 for automatically transferring a sucker rod or a sucker rod tubing to the wellhead equipment 20 or automatically transferring a sucker rod or a sucker rod tubing from the wellhead equipment 20, wherein the alignment mechanism includes a positioning mechanism 1 provided on the transfer frame 10 and a positioning socket 2 provided on the wellhead equipment 20, the positioning mechanism 1 and the positioning socket 2 cooperating to achieve alignment and positioning of the transfer frame 10 with the wellhead equipment 20.

In the above example, in the aligned state of the transfer frame 10 and the wellhead device 20, the positioning head 11 of the positioning mechanism 1 extends into the positioning groove of the positioning socket 2, wherein the lower positioning surface 111 of the positioning head 11 of the positioning mechanism 1 abuts against the bottom positioning surface 211 of the positioning socket, and the two side positioning surfaces 112 of the positioning head 11 are adjacent to (may have a gap, for example, a gap of 1 mm) or in contact with the two side positioning surfaces 212 of the positioning socket, and the shoulder 121 abuts against the end surface 213 of the seat body 21. The abutment of the lower positioning surface 111 against the bottom positioning surface 211 thus effects the positioning of the positioning head 11 of the positioning mechanism in the downward direction in the positioning socket 20; and the two side positioning faces 112 of the positioning head 11 are limited by the two side positioning faces 212 of the positioning groove, positioning in the left-right direction in fig. 3 is realized; the shoulder 121 rests on the end face 213 of the seat body 21, so that the positioning mechanism 1 is again positioned relative to the positioning socket 2 in the direction in which the positioning head 11 projects into the positioning socket of the positioning socket (in fig. 3, in the front-rear direction along the depth of the positioning socket). Therefore, the positioning mechanism 1 and the positioning seat 2 are aligned and positioned, and the positioning mechanism is arranged on the transfer frame 10, and the positioning seat 2 is arranged on the wellhead equipment 20, so that the alignment and positioning of the transfer frame 10 and the wellhead equipment 20 are realized. During installation of the workover rig, as an example, positioning of the wellhead assembly 20 may be accomplished by first installing the wellhead assembly 20 at the wellhead. The hoisting and transferring frame is moved to make the positioning mechanism 1 on the transferring frame to find the positioning socket 2 on the wellhead equipment 20, and the positioning surfaces 111, 112 and the shoulder 121 of the positioning mechanism 1 are contacted or matched with the

positioning surfaces

211, 212 and the end surface 213 in the positioning socket 2, so that the accurate alignment and positioning (in the horizontal direction) of the transferring frame 10 relative to the wellhead equipment 20 are completed, therefore, the transferring frame 10 can ensure that the pumping pipe/rod is accurately clamped to be removed and/or moved into the positioning/clamping device of the wellhead equipment 20, and the automatic transferring of the pumping pipe/rod is smoothly realized. Specifically, during the tripping of the sucker rod/pipe, the gripping device for the pipe/pipe in the transfer frame 10, when moved to the wellhead, for example with the swing arm of the transfer frame 10, can just interface with the location/gripping device at the wellhead 20 and the position of the elevator, to accurately grip the pipe/pipe and remove it. During lowering of the sucker rod/pipe, the gripping device for the pipe/pipe in the transfer frame 10 can align the pipe/pipe positioning/gripping device of the wellhead 20 and the elevator as it swings with the swing arm of the transfer frame 10 to the wellhead, for example, thereby handing the pipe/pipe over to the positioning/gripping device of the wellhead 20 and the elevator. Because the automatic moving and conveying of the oil pumping pipe/rod are realized, the process does not need manual work, the labor force is saved, and the efficiency is improved.

Illustratively, as shown in fig. 2, the positioning mechanism further comprises two swing arm assemblies 13, each swing arm assembly 13 being pivotally connected to one side of the positioning body 12, wherein the swing arm assemblies 13 comprise a housing 131, a telescopic arm 132 at least partially accommodated in the housing 131, and a hand grip 133 disposed at an end of the telescopic arm 132 and outside the housing 131; correspondingly, the positioning base 2 further includes two fixing columns 22, and the two fixing columns 22 are respectively connected to the base body 21 through a connecting plate at one side of the base body 21. In the aligned state of the transfer frame 10 and the wellhead 20, each gripper 133 grips one corresponding fixed column 22 and each telescopic arm 132 is in the retracted state with respect to the housing 131, so as to ensure that the shoulder 121 abuts against the end face 213 of the seat body 21 and the positioning mechanism 1 is connected with the positioning socket 2. In this example, the swing arm assembly 13 can be swung open manually so as to ensure that the swing arm assembly 13 does not interfere with the fixed post 22 during movement of the positioning mechanism 1 toward the positioning socket 2 to extend the positioning head 11 into the positioning socket in the seat body 21. After the positioning head 11 extends into the positioning groove and the lower positioning surface 111 of the positioning head abuts against the bottom positioning surface 211 of the positioning groove, the swing arm assembly 13 is swung back manually, the hand grip grasps the centering cylinder of the positioning groove, and the driving device (such as a hydraulic cylinder) for driving the telescopic arm 132 acts to retract the telescopic arm 132 relative to the housing 131, under the pulling of the telescopic arm 132, the positioning mechanism 1 further moves towards the positioning seat 2 to further extend the positioning head 11 into the positioning groove until the shoulder 121 of the positioning body 12 abuts against the end surface 213 of the base body 21, so that the positioning mechanism 1 is positioned relative to the positioning seat 2, and the hand grip of the swing arm assembly 13 grasps the fixed column 22 to realize the fixed connection of the positioning mechanism and the positioning seat 2, so that the distance between the transfer frame 10 and the wellhead equipment 20 is ensured.

During the placement of the transfer frame 10, alignment of the transfer frame 10 with the wellhead equipment 20 is accomplished, and if the ground, i.e., the mounting plane, on which the transfer frame 10 is dropped is not flat, there is an angle between the mounting plane of the transfer frame 10 and the mounting plane of the wellhead equipment 20. In order to be able to rest the lower positioning surface 111 of the positioning head 11 of the positioning means 1 against the lower positioning surface 211 even in the presence of this angle in order to achieve a precise positioning of the positioning means 1 and the positioning socket 2, a pivoting support assembly 16 is also provided in the example of the invention. As shown in fig. 2, the positioning mechanism 1 further includes a connecting base 14 connected to the transfer frame 10, a rotation body 15 connected to the connecting base 14, and a rotation support assembly 16 for rotatably connecting the rotation body 15 to the positioning body 12. In this example, the slewing bearing assembly 16 allows the slewing body 15 connected to the transfer frame 10 to be able to rotate relative to the positioning body of the positioning mechanism 1, so that even in the event of tilting of the transfer frame 10, the lower positioning face 111 of the positioning head 11 can still bear against the bottom positioning face 211 and does not rigidly twist the swing arm assembly of the positioning mechanism causing stress in the positioning mechanism.

As shown in fig. 2, by way of example, the slewing bearing assembly 16 may be connected to the positioning body 12 at a first portion (not numbered, e.g., by a connecting plate) and to the slewing body at a second portion (e.g., by a connecting plate), the first and second portions being rotatable relative to each other, e.g., supported by bearings.

In the workover rig, the connecting link 14 as an example of the positioning mechanism 1 is slidably connected to the transfer frame 10. I.e. the positioning mechanism 1 may be floatingly connected to the transfer frame 10 so that alignment and connection of the transfer frame 10 to the wellhead equipment can be achieved for wellhead installation equipment of different installation heights. As an example, the transfer frame 10 comprises two opposite guide rails; as shown in fig. 2, the coupling holder 14 includes a first arm 141 and two second arms 142, the two second arms 142 are respectively coupled to one end of the first arm 141, wherein both ends of each second arm 142 are respectively provided with a guide 143, and the guide 143 is slidably coupled to the guide rail.

Further, as shown in fig. 3, the positioning socket 2 disposed on the wellhead 20 further comprises a connecting portion 23 for connecting to the wellhead 20, wherein the connecting portion 23 comprises a transverse connector 231 connected to the two fixing posts 22, respectively, and a sleeve 232, the sleeve 232 is connected to the transverse connector 231 and is sleeved on a guide mechanism (not shown) of the wellhead 20, and the guide mechanism penetrates through the sleeve and the transverse connector 231, so that the positioning socket can slide relative to the wellhead 20.

In connection with the structure of the above examples, the docking process for alignment and positioning between the transfer frame 10 and the wellhead 20 will be described below in a more specific embodiment to better understand the structure and operation of the examples of the present invention:

(1) after the wellhead 20 has been installed, the spud 2 is now slid by gravity along the guiding means of the wellhead 20 to the lowermost position, so that the spud 2 is also already positioned. The transfer frame 10 is hoisted, and the positioning mechanism 1 is located at the lowest end position of the guide rail of the transfer frame due to gravity and can slide up and down along the guide rail.

(2) The swing arm assembly of the positioning mechanism 1 is manually swung at a certain angle, and the hydraulic oil cylinder is operated to extend the grippers of the left and right swing arm assemblies. The transfer frame is slowly lowered so that the positioning head 11 of the positioning means 1 on it rests in the positioning socket 2 of the wellhead 20, the transfer frame is lowered, but the positioning means 1, because its lower positioning face 111 rests against the bottom positioning face 211 of the positioning socket, is no longer lowered and merely slides relative to the guide rails of the transfer frame 10. The transfer frame is lowered until it contacts the ground.

(3) The left and right swing arm assemblies 13 are manually closed, and the fixed post 22 of the positioning socket is grasped by the grasping hand 133 of the swing arm assembly. The hydraulic oil cylinder is operated to retract the gripper 133, so that the positioning mechanism 1 is pulled to move towards the positioning body 2 until the shoulder 121 of the positioning body 12 of the positioning mechanism 1 abuts against the end face 213 of the base body 21, so that the positioning mechanism 1 and the positioning seat 2 are connected, the positioning of the moving frame and the wellhead equipment in the horizontal direction is realized, and the distance between the moving frame 10 and the wellhead equipment 20 is ensured.

(4) The inclined moving frame can be leveled by adjusting a height adjusting means (e.g., a hydraulic cylinder or an air cylinder) provided at a lower portion of the moving frame 10.

In order to simply and reliably connect the rotation body 15 to the connection base 14 and thus to the moving frame 10, there is also provided an exemplary structure in which the rotation body 15 includes a main body 151 and two connection arms 152 connected to one side of the main body 151, respectively; and attachment section 14 is formed with a lug 144 corresponding to the attachment arm, each attachment arm 152 being attached to a corresponding lug 144. Preferably, as shown in fig. 2, each connecting arm 152 is shaped as a substantially C-shaped member, the connecting section 14 being provided with four lugs 144, each end of the C-shaped member being connected to a respective lug 144. Each connecting arm 152 may include two opposite and spaced apart connecting plates 1521, the lug 144 extends into the space between the two connecting plates 1521, and the rotator 15 includes a pin 153, and the lug 144 is connected with the connecting plate 1521 through the pin 153.

There is also provided in accordance with an exemplary embodiment of the present invention a workover rig including a wellhead apparatus 20 disposed at a wellhead and a transfer frame 10 for automatically transferring a sucker rod or tubing to the wellhead apparatus 20 and/or from the wellhead apparatus 20, and further including an alignment mechanism as described in the examples above. The workover rig comprising the alignment mechanism can align the moving and transporting frame 10 and the wellhead equipment 20 due to the characteristics of the alignment mechanism, so that the moving and transporting frame can automatically move and transport the pumping pipes in the operation process of the workover rig, the automation degree of the workover rig is improved, and the workover rig has important significance for improving the working efficiency, particularly realizing the automation of the whole workover rig in the working process. In view of the current situation of low automation degree in the field of workover rigs, the application of the alignment mechanism in the field of workover rigs is particularly significant and innovative.

It will be apparent to those skilled in the art that various modifications and variations can be made in the above disclosed embodiments without departing from the scope or spirit of the invention. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and disclosed examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims and their equivalents.

Claims

1. A positioning mechanism for a workover rig, characterized in that, the workover rig includes a transfer frame (10) for automatically transferring a sucker rod or oil pumping pipe, the positioning mechanism is provided on the transfer frame (10), wherein the positioning mechanism (1) includes:

a positioning body (12), wherein the positioning body (12) comprises a shoulder (121) for positioning;

a positioning head (11) protruding from the shoulder, wherein the positioning head (11) comprises a lower positioning face (111) and two opposite side positioning faces (112) extending substantially perpendicular to the lower positioning face (111).

2. The positioning mechanism of claim 1,

the positioning mechanism further comprises at least one swing arm assembly (13) pivotably connected to the positioning body (12), wherein the swing arm assembly (13) comprises a housing (131), a telescopic arm (132) at least partially accommodated in the housing (131), and a grip (133) arranged at an end of the telescopic arm (132) and located outside the housing (131).

3. The positioning mechanism of claim 2,

each swing arm assembly (13) further comprises drive means for driving the telescopic arm (132) to extend and retract relative to the housing (131).

4. The positioning mechanism of any of claims 1-3,

the positioning mechanism (1) further comprises:

a connecting seat (14) connected to the transfer frame (10);

a revolving body (15) connected with the connecting seat (14); and

a slewing bearing assembly (16) for rotatably connecting the slewing body (15) to the positioning body (12).

5. The positioning mechanism of claim 4,

the connecting socket (14) is slidably connected to the transfer frame (10).

6. The positioning mechanism of claim 5,

the transfer frame (10) comprises two opposite guide rails; and the connection socket (14) includes:

a first arm (141); and

two second arms (142) respectively connected to one ends of the first arms (141), wherein both ends of each second arm (142) are respectively provided with a guide (143), and the guide (143) is slidably connected to the guide rail.

7. The positioning mechanism according to any one of claims 1-6, wherein the rotator (15) comprises a main body (151) and two connecting arms (152) respectively connected to one side of the main body (151); and is

The connecting seat (14) is formed with lugs (144) corresponding to the connecting arms, and the connecting arms (152) are respectively connected to the lugs (144).

8. The positioning mechanism according to claim 7, wherein each connecting arm (152) is shaped as a substantially C-shaped member, four lugs (144) being provided on the connecting section (14), each end of the C-shaped member being connected to a respective lug (144).

9. The positioning mechanism of claim 8,

each connecting arm (152) comprises two opposite connecting plates (1521) which are spaced apart, the lugs (144) extend into the space between the two connecting plates (1521), and the revolving body (15) comprises a pin, and the lugs (144) are connected with the connecting plates through the pins.

10. A positioning seat for a workover rig, characterized in that, the workover rig includes a wellhead equipment (20) arranged at a wellhead, the positioning seat (2) is provided on the wellhead equipment (20), wherein the positioning seat (2) includes:

a seat body (21), the seat body (21) having a positioning slot formed therein, wherein the positioning slot comprises a bottom positioning surface (211) and two opposing side positioning surfaces (212) extending substantially perpendicular to the bottom positioning surface (211), the seat body further comprising an end surface (213) for positioning located at an entrance of the positioning slot.

11. Positioning socket according to claim 10, characterized in that the positioning socket (2) further comprises two fixing posts (22), the two fixing posts (22) being connected to the seat body (21) by a connecting plate on one side of the seat body (21), respectively.

12. The spud of claim 11, further comprising a connection portion (23) for connecting to the wellhead equipment (20), wherein the connection portion (23) comprises:

the transverse connecting pieces (231) are respectively connected to the two fixing columns (22); and

a sleeve (232) connected to the cross-connector (231) and sleeved over the guide mechanism of the wellhead equipment (20) so that the locating seat can slide relative to the wellhead equipment (20).

13. An alignment mechanism for a workover rig, wherein the workover rig comprises a wellhead equipment (20) arranged at a wellhead and a transfer frame (10) for automatically transferring a sucker rod or a sucker rod tubing to the wellhead equipment (20) and/or automatically transferring a sucker rod or a sucker rod tubing from the wellhead equipment (20), wherein the alignment mechanism comprises a positioning mechanism (1) provided on the transfer frame (10) and a positioning socket (2) provided on the wellhead equipment (20), the positioning mechanism (1) and the positioning socket (2) cooperating to effect alignment and positioning of the transfer frame (10) with the wellhead equipment (20).

14. The alignment mechanism of claim 13,

wherein the positioning mechanism (1) comprises:

a positioning body (12), wherein the positioning body (12) comprises a shoulder (121) for positioning; and

a positioning head (11) projecting from said shoulder, wherein said positioning head (11) comprises a lower positioning face (111) and two opposite side positioning faces (112) extending substantially perpendicular to said lower positioning face (111);

the positioning seat (2) comprises a seat body (21), a positioning groove is formed in the seat body (21), the positioning groove comprises a bottom positioning surface (211) and two opposite side positioning surfaces (212) extending basically perpendicular to the bottom positioning surface (211), and the seat body (21) further comprises an end surface (213) located at an inlet of the positioning groove and used for positioning;

in the alignment state of the moving frame (10) and the wellhead equipment (20), a positioning head (11) of the positioning mechanism (1) extends into the positioning groove of the positioning seat (2), wherein the lower positioning surface (111) is attached to the bottom positioning surface (211), two side positioning surfaces (112) of the positioning head (11) are adjacent to or in contact with two side positioning surfaces (212) of the positioning groove, and the shoulder (121) is attached to an end surface (213) of the seat body (21).

15. The alignment mechanism of claim 14,

the positioning mechanism further comprises two swing arm assemblies (13), each swing arm assembly (13) is respectively connected to one side of the positioning body (12) in a pivoting mode, wherein each swing arm assembly (13) comprises a shell (131), a telescopic arm (132) accommodated in the shell (131) and a handle (133) arranged at the end part of the telescopic arm (132) and located outside the shell (131); and is

The positioning seat (2) further comprises two fixing columns (22), and the two fixing columns (22) are respectively connected to the seat body (21) through connecting plates at one side of the seat body (21);

wherein in the aligned state of the transfer frame (10) and the wellhead equipment (20), each gripper (133) grips a corresponding fixed column (22) and each telescopic arm (132) is in a retracted state relative to the housing (131) to ensure that the shoulder (121) abuts against an end face (213) of the seat body (21) and the positioning mechanism (1) is connected with the positioning seat (2).

16. The alignment mechanism of any one of claims 13-15,

the positioning mechanism (1) further comprises:

a connecting seat (14) connected to the transfer frame (10);

a revolving body (15) connected with the connecting seat (14); and

17. The alignment mechanism of claim 16,

the connecting socket (14) is slidably connected to the transfer frame (10).

18. The alignment mechanism of claim 17,

a first arm (141); and

19. The alignment mechanism according to claim 16 or 17, wherein the rotator (15) comprises a main body (151) and two connecting arms (152) respectively connected to one side of the main body (151); and is

The connecting seat (14) is formed with lugs (144) corresponding to the connecting arms, and each connecting arm (152) is connected to the corresponding lug (144).

20. The alignment mechanism as claimed in claim 19 wherein each of the connecting arms (152) is shaped as a generally C-shaped member, four of the lugs (144) being provided on the connecting section (14), each end of the C-shaped member being connected to a respective lug (144).

21. An alignment mechanism for a workover rig comprising the positioning mechanism of any one of claims 1 to 9 and the positioning socket of any one of claims 10 to 12.

22. A workover rig comprising a wellhead device (20) arranged at a wellhead and a transfer frame (10) for automatically transferring a sucker rod or tubing to and/or from the wellhead device (20), the workover rig further comprising an alignment mechanism according to any one of claims 13 to 21.