Workover rig

Abstract

The invention provides a workover rig, and belongs to the technical field of workover. The workover rig comprises a chassis, a pipe column lifting device, a vertical pipe arranging box, a mechanical arm, a slip, a rotary buckle assembly and a control system, wherein the vertical pipe arranging box is used for vertically containing a pipe column. The control system is configured to control the pipe column lifting device to lift the first pipe column in the pipe lifting process until the first pipe column reaches the shackle position, and the first pipe column is in butt joint with the second pipe column. And the slip is controlled to clamp the second tubular column, the spinner assembly is controlled to shackle the first tubular column and the second tubular column, and the tubular column lifting device is controlled to lift the first tubular column. And the mechanical arm is controlled to clamp the first pipe column, the pipe column lifting device is controlled to release the first pipe column, and the mechanical arm is controlled to place the first pipe column in the vertical pipe arranging box. Automatic operation of the workover rig is achieved, and the labor intensity of workers in the workover process is reduced. In addition, the vertical pipe arranging box is used for vertically containing the pipe columns, the pipe lifting efficiency can be improved, and the occupied area of the workover rig can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of well repair, and in particular to a well repair machine. Background Art

[0002] The workover rig is the most commonly used mechanical equipment in workover operations. It is mainly used to lift out, repair, replace and re-enter the well of failed or damaged downhole oil production equipment and tools such as oil pipes, sucker rods and oil pumps, as well as to perform suction, sand bailing and mechanical wax cleaning.

[0003] The automation level of workover rigs in related technologies is low, and multiple workers are required to participate in the operation. For example, the pipe lifting process requires two people to work together manually to complete the shackle between the two pipe strings, and after the shackle is completed, the pipe string is manually dragged and transported. As a result, the workover process is inefficient, time-consuming, and labor-intensive. Summary of the invention

[0004] The present disclosure provides a workover machine, which can solve the technical problems existing in the related technologies. The technical solution of the workover machine is as follows:

[0005] The present disclosure provides a workover rig, which includes a chassis, a pipe string tripping device, a vertical pipe row box, a mechanical arm, a slip, a spin buckle assembly and a control system;

[0006] The pipe string lifting and lowering device is located on the chassis;

[0007] The vertical pipe arrangement box and the mechanical arm are located on one side of the chassis, and the vertical pipe arrangement box is used to vertically hold pipe columns;

[0008] The slips and the spindle assembly are located at the wellhead;

[0009] During the pipe lifting process, the control system is configured to:

[0010] Controlling the pipe string tripping device to lift the first pipe string until the first pipe string reaches a shackle position, wherein the bottom end of the first pipe string is connected to the top end of the second pipe string;

[0011] Controlling the slips to clamp the second pipe string;

[0012] Controlling the spinner assembly to detach the first pipe string and the second pipe string;

[0013] Controlling the pipe string tripping device to lift the first pipe string;

[0014] Controlling the mechanical arm to clamp the first pipe string;

[0015] Controlling the pipe string tripping device to release the first pipe string;

[0016] The robot arm is controlled to place the first pipe column in the vertical pipe arrangement box.

[0017] In a possible implementation, during the tube lowering process, the control system is further configured to:

[0018] Controlling the slips to clamp the fourth pipe string;

[0019] Controlling the mechanical arm to transfer the third pipe string from the vertical pipe row box to the pipe string tripping device;

[0020] Controlling the mechanical arm to release the third pipe string;

[0021] Controlling the pipe string tripping device to lower the third pipe string until the bottom end of the third pipe string is aligned with the top end of the fourth pipe string;

[0022] Controlling the buckle assembly to buckle the third pipe column and the fourth pipe column;

[0023] Controlling the slips to release the fourth pipe string;

[0024] The pipe string tripping device is controlled to lower the third pipe string.

[0025] In a possible implementation, the vertical tube arrangement box has a tube column groove inside, and the axial direction of the tube column groove is parallel to the vertical direction.

[0026] In a possible implementation, the pipe string tripping device includes a direct-drive winch, a derrick and an elevator;

[0027] The steel wire rope of the direct drive winch is connected to the elevator, and the steel wire rope is slidably connected to the top of the derrick;

[0028] The elevator is used to clamp the pipe column;

[0029] The direct drive winch is used to lift or lower the pipe column clamped by the elevator by rotating.

[0030] In a possible implementation, the direct-drive winch includes a frame, a first motor, a rotating shaft, and a drum;

[0031] The frame is fixed to the chassis, the first motor is fixed to the frame, the output shaft of the first motor is a hollow shaft, the rotating shaft is located inside the output shaft and is drivingly connected to the output shaft;

[0032] The rotating shaft is drivingly connected to the roller.

[0033] In a possible implementation, the workover rig further includes an emergency power device, the emergency power device includes a second motor and a first gear, and the second motor is transmission-connected to the first gear;

[0034] The direct-drive winch further comprises a second gear, which is transmission-connected to the rotating shaft;

[0035] When the first motor is working, the first gear and the second gear are separated;

[0036] When the first motor fails, the first gear is meshed with the second gear, and the second motor drives the first gear to rotate.

[0037] In a possible implementation manner, a diameter of the first gear is smaller than a diameter of the second gear.

[0038] In a possible implementation, the workover rig further includes a spraying device;

[0039] After controlling the spinner assembly to detach the first pipe string and the second pipe string, the control system is further configured to:

[0040] The rush spray device is controlled to block the bottom end of the first pipe column.

[0041] In a possible implementation, the workover rig further includes a power supply system, and the power supply system includes a battery, a first rectifier, a second rectifier, and an inverter;

[0042] The input end of the first rectifier is electrically connected to the battery, and the output end of the first rectifier is electrically connected to the input end of the inverter, wherein the first rectifier is used to convert the high-voltage direct current output by the battery into low-voltage direct current and output it to the inverter;

[0043] The input end of the second rectifier is electrically connected to the well site transformer, and the output end of the second rectifier is electrically connected to the input end of the inverter, wherein the second rectifier is used to convert the alternating current of the power grid into direct current and output it to the inverter;

[0044] The output end of the inverter is electrically connected to the pipe string lifting and lowering device;

[0045] When the power of the well site transformer is greater than the load power of the pipe string tripping device, the first rectifier is disconnected from the battery;

[0046] When the power of the well site transformer is less than the load power of the pipe string tripping device, the first rectifier and the battery are powered.

[0047] In a possible implementation, the workover rig further includes an operation room, and the control system is located in the operation room.

[0048] The technical solution provided by the present disclosure includes at least the following beneficial effects:

[0049] The present invention provides a workover rig, wherein a control system controls the workover rig to automatically complete the operations of lifting pipes and breaking out pipe strings, thereby realizing the automated operation of the workover rig, reducing the number of workers and labor intensity during the workover process, and improving the work efficiency of the workover.

[0050] In addition, since the vertical pipe box can hold the pipe column vertically, compared with the traditional flat-lay pipe box, the robotic arm does not need to rotate the pipe column when transferring the pipe column in the vertical pipe box to the pipe column lifting and lowering device, which can improve the efficiency of lowering the pipe and reduce the footprint of the vertical pipe box.

[0051] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, are used to explain the principles of the present disclosure. In the drawings:

[0053] Figure 1 is a structural schematic diagram of a workover machine shown in an embodiment of the present disclosure;

[0054] Figure 2 is a schematic diagram of a workover machine shown in an embodiment of the present disclosure;

[0055] Figure 3 is a partial structural schematic diagram of a workover machine shown in an embodiment of the present disclosure;

[0056] Figure 4 is a partial structural schematic diagram of a workover machine shown in an embodiment of the present disclosure;

[0057] Figure 5 is a workflow diagram of a pipe lifting process of a workover rig shown in an embodiment of the present disclosure;

[0058] Figure 6 is a workflow diagram of a pipe lowering process of a workover rig shown in an embodiment of the present disclosure;

[0059] Figure 7 is a structural schematic diagram of a vertical pipe arrangement box shown in an embodiment of the present disclosure;

[0060] Figure 8 is a structural schematic diagram of a direct-drive winch shown in an embodiment of the present disclosure;

[0061] Fig. 9 is a structural schematic diagram of a direct-drive winch shown in an embodiment of the present disclosure;

[0062] Fig.10is a partial structural schematic diagram of a direct-drive winch shown in an embodiment of the present disclosure;

[0063] Fig.11 is a partial structural schematic diagram of a workover machine shown in an embodiment of the present disclosure;

[0064] Fig.12 It is a schematic diagram of a power supply system shown in an embodiment of the present disclosure.

[0065] Legend:

[0066] 1. Chassis;

[0067] 2. Pipe column lifting and lowering device, 21. Direct drive winch, 211. Frame, 212. First motor, 2121. Output shaft, 213. Rotating shaft, 214. Drum, 215. Second gear, 22. Derrick, 23. Elevator;

[0068] 3. Vertical pipe box, 30. Pipe column slot;

[0069] 4. Robotic arm;

[0070] 5. Kava;

[0071] 6. Turnbuckle assembly;

[0072] 7. Control system;

[0073] 8. Emergency power device, 81. Second motor, 82. First gear;

[0074] 9. Spraying device;

[0075] 10. Power supply system, 101. Battery, 102. First rectifier, 103. Second rectifier, 104. Inverter;

[0076] 11. Operation room.

[0077] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0078] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0079] The terms used in the embodiments of the present disclosure are only used to explain the embodiments of the present disclosure, and are not intended to limit the present disclosure. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limit, but indicate that there is at least one. Words such as "include" or "include" mean that the elements or objects appearing in front of "include" or "include" include the elements or objects listed after "include" or "include" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0080] The workover rig is the most commonly used mechanical equipment in well repair operations. It is mainly used to lift, repair, replace, and re-enter the well for failed or damaged oil pipes, sucker rods, pumps and other downhole oil production equipment and tools, as well as suction, sand bailing, mechanical wax removal, etc. The automation level of the workover rig operation in the relevant technology is low, and multiple workers are required to participate in the operation. For example, the pipe lifting process requires two people to work together manually to complete the unbuckling between the two pipe strings. After the unbuckling is completed, the pipe string is manually dragged and transported. As a result, the well repair process is inefficient, takes a long time, and has a high labor intensity.

[0081] In view of the above technical problems, the present disclosure provides a workover machine, such as Figure 1-Figure 4 As shown, the workover rig includes a chassis 1, a pipe string tripping device 2, a vertical pipe row box 3, a mechanical arm 4, a slip 5, a spin button assembly 6 and a control system 7. The pipe string tripping device 2 is located on the chassis 1, the vertical pipe row box 3 and the mechanical arm 4 are located on one side of the chassis 1, the vertical pipe row box 3 is used to vertically hold the pipe string, and the slip 5 and the spin button assembly 6 are located at the wellhead.

[0082] like Figure 5 As shown, during the pipe lifting process, the control system 7 is configured to: control the pipe string lifting device 2 to lift the first pipe string until the first pipe string reaches the shackle position, wherein the bottom end of the first pipe string is connected to the top end of the second pipe string. Control the slip 5 to clamp the second pipe string, control the spin buckle assembly 6 to shackle the first pipe string and the second pipe string, and control the pipe string lifting device 2 to lift the first pipe string. Control the mechanical arm 4 to clamp the first pipe string, control the pipe string lifting device 2 to release the first pipe string, and control the mechanical arm 4 to place the first pipe string in the vertical pipe box 3.

[0083] When you need to continue lifting the tube, just repeat the above operation.

[0084] The pipe string may be an oil pipe or a sucker rod. When the pipe string tripping device 2 and the mechanical arm 4 clamp the pipe string, they avoid the top and bottom ends of the pipe string to avoid clamping the coupling position of the pipe string, thereby affecting the shackle and make-up of the pipe string.

[0085] The mechanical arm 4 can be extended and retracted. When the mechanical arm 4 places the first pipe string on the pipe string lifting and lowering device 2 and releases the first pipe string, the mechanical arm 4 will move away from the wellhead to avoid collision between the pipe string lifting and lowering device 2 and the mechanical arm 4 when lifting the first pipe string.

[0086] The spindle assembly 6 can be a hydraulic clamp, and the slips 5 and the spindle assembly 6 can be located on the same working platform. After the spindle assembly 6 completes the shackle operation, the spindle assembly 6 can move and clear the wellhead to avoid collision between the pipe string tripping device 2 and the spindle assembly 6 when lifting the first pipe string.

[0087] The control system 7 can automatically issue operating instructions through computer programs, identify, analyze and make decisions on relevant parameters, and perform intelligent adjustments and corrections, thus completely realizing an unmanned well repair operation mode.

[0088] The technical solution provided by the embodiment of the present disclosure is that the control system 7 can control the workover rig to complete the operation of automatically lifting the pipe and breaking out the pipe string, thereby realizing the automated operation of the workover rig, reducing the number of workers and labor intensity during the workover process. It can also further reduce the equipment installation, preparation and construction period, thereby achieving the purpose of improving the overall operation efficiency and reducing the overall use cost.

[0089] In addition, since the vertical pipe rack 3 can hold the pipe string vertically, compared with the traditional flat-lay pipe rack, the mechanical arm 4 does not need to rotate the pipe string when transferring the pipe string in the vertical pipe rack 3 to the pipe string lifting device 2, which can improve the efficiency of pipe lifting. The vertical pipe rack 3 can meet the needs of single well and cluster well operations. According to experimental verification, the pipe lifting speed of the workover rig using the vertical pipe rack 3 is not less than 50 pipes / hour, and the operating efficiency is improved by more than 15% compared with other automated equipment.

[0090] In addition, the vertical pipe box 3 occupies a smaller space in the horizontal direction, thus being able to reduce the floor space occupied by the workover rig.

[0091] In some examples, such as Figure 6As shown, during the pipe lowering process, the control system 7 is further configured to: control the slips 5 to clamp the fourth pipe string, control the mechanical arm 4 to transfer the third pipe string from the vertical pipe box 3 to the pipe string lowering device 2. Control the mechanical arm 4 to release the third pipe string, control the pipe string lowering device 2 to lower the third pipe string until the bottom end of the third pipe string is aligned with the top end of the fourth pipe string, and control the spin buckle assembly 6 to buckle the third pipe string and the fourth pipe string. Control the slips 5 to release the fourth pipe string, and control the pipe string lowering device 2 to buckle the third pipe string. In this way, the workover rig can automatically lower the pipe, and there is no need to manually carry the pipe string and perform the buckle operation, which improves the work efficiency when lowering the pipe.

[0092] When you need to continue lowering the pipe string, just repeat the above operation.

[0093] In order to ensure the safety of the workover operation, the control system 7 also has an interlocking mechanism. During the pipe lowering process, when the slips 5 do not clamp the pipe string, the pipe string lowering device 2 is prohibited from loosening the pipe string. Conversely, during the pipe lifting process, when the control pipe string lowering device 2 does not clamp the pipe string, the slips 5 are prohibited from loosening the pipe string.

[0094] During the pipe lowering process, when the mechanical arm 4 transfers the pipe string to the pipe string tripping device 2, if the pipe string tripping device 2 does not clamp the pipe string, the mechanical arm 4 is prohibited from loosening the pipe string. Conversely, during the pipe lifting process, when the mechanical arm 4 transfers the pipe string from the pipe string tripping device 2 to the vertical pipe row box 3, if the mechanical arm 4 does not clamp the pipe string, the pipe string tripping device 2 is prohibited from loosening the pipe string.

[0095] When the mechanical arm 4 and the pipe string tripping device 2 clamp the pipe string at the same time, the mechanical arm 4 is prohibited from extending or retracting to avoid pulling the pipe string and thus damaging the pipe string.

[0096] When the spinner assembly 6 unhooks the first and second pipe strings, or hooks up the third and fourth pipe strings, the direct drive winch 21 in the pipe string tripping device 2 is prohibited from rotating to avoid pulling the pipe string and causing damage to the pipe string.

[0097] When the spindle assembly 6 unfastens the first pipe string and the second pipe string, the slips 5 are prohibited from loosening the second pipe string. When the spindle assembly 6 fastens the third pipe string and the fourth pipe string, the slips 5 are prohibited from loosening the fourth pipe string. On the contrary, when the slips 5 are opened, the spindle assembly 6 is prohibited from fastening or unfastening. This prevents the spindle assembly 6 from being subjected to a large downward pulling force from the second pipe string or the fourth pipe string.

[0098] The above-mentioned interlocking mechanism can effectively prevent the workers from colliding with each other due to accidental operation during the well repair process, protect the safety of each mechanism when handing over the pipe column, reduce the probability of safety accidents, and improve the overall safety of well repair operations.

[0099] In some examples, such as Figure 7As shown, the vertical pipe box 3 has a pipe column groove 30 inside, and the axial direction of the pipe column groove 30 is parallel to the vertical direction. The pipe column is placed in the pipe column groove 30, so that the pipe column is neatly and orderly arranged in the vertical pipe box 3, so as to facilitate the work of lifting the pipe column during the well repair operation and the work of lowering the pipe column after the well repair is completed.

[0100] The following is an exemplary description of the implementation of the pipe string tripping device 2:

[0101] In some examples, such as Figure 3 As shown, the pipe string lifting and lowering device 2 includes a direct-drive winch 21, a derrick 22 and an elevator 23. The direct-drive winch 21 is fixed on the chassis 1, and the wire rope of the direct-drive winch 21 is connected to the elevator 23, and the wire rope is slidably connected to the top of the derrick 22, and the elevator 23 is used to clamp the pipe string. The direct-drive winch 21 is used to lift or lower the pipe string clamped by the elevator 23 by rotating. The top of the derrick 22 has a pulley, and the wire rope is wound around the pulley, so as to realize the sliding connection between the wire rope and the derrick 22.

[0102] The elevator 23 has a sensor. When the sensor detects that the mechanical arm 4 has delivered the pipe string into the elevator 23, the sensor sends a signal to the control system 7, so that the control system 7 controls the elevator 23 to close, thereby making the elevator 23 clamp the pipe string.

[0103] It can be understood that when the elevator 23 is lifted up or lowered, the rotation direction of the direct-drive winch 21 is opposite.

[0104] In some examples, such as Figure 8-Figure 10 As shown, the direct-drive winch 21 includes a frame 211, a first motor 212, a rotating shaft 213 and a roller 214. The frame 211 is fixed to the chassis 1, the first motor 212 is fixed to the frame 211, the output shaft 2121 of the first motor 212 is a hollow shaft, the rotating shaft 213 is located inside the output shaft 2121, and is transmission-connected to the output shaft 2121, and the rotating shaft 213 is transmission-connected to the roller 214. In this way, the connection width between the roller 214 and the first motor 212 can be reduced, thereby reducing the width of the direct-drive winch 21, solving the problem of arranging the direct-drive winch 21 in a confined space, facilitating the arrangement of the direct-drive winch 21 on the chassis 1, and allowing the chassis 1 to have more space for arranging other components.

[0105] In some examples, such as Fig. 9As shown, the workover rig further includes an emergency power device 8, which includes a second motor 81 and a first gear 82, and the second motor 81 is in transmission connection with the first gear 82. The direct drive winch 21 further includes a second gear 215, and the second gear 215 is in transmission connection with the rotating shaft 213. When the first motor 212 is working, the first gear 82 and the second gear 215 are separated. When the first motor 212 fails, the first gear 82 is meshed with the second gear 215, and the second motor 81 drives the first gear 82 to rotate. In this way, serious accidents caused by sudden power failure or failure of the first motor 212 can be avoided, thereby improving the safety and reliability of the workover operation.

[0106] In some examples, such as Fig. 9 As shown, the diameter of the first gear 82 is smaller than the diameter of the second gear 215. The first gear 82 and the second gear 215 can be regarded as a deceleration mechanism, which increases the torque of the shaft 213 by decelerating the second motor 81, so that the shaft 213 has enough torque to lift or lower the elevator 23 through the roller 214.

[0107] Since there is oil in the first pipe string and the second pipe string, if the first pipe string is directly lifted up after the first pipe string and the second pipe string are unhooked, the oil in the first pipe string will be sprayed out, thereby causing environmental pollution. Figure 2 and Fig.11 As shown, the workover rig further includes a spraying device 9. After controlling the spinner assembly 6 to unscrew the first pipe string and the second pipe string, the control system 7 is further configured to control the spraying device 9 to block the bottom end of the first pipe string. After the oil in the first pipe string is completely discharged into the spraying device 9, the mechanical arm 4 places the first pipe string in the vertical pipe box 3.

[0108] In some examples, such as Fig.12 As shown, the workover rig further includes a power supply system 10, which includes a battery 101, a first rectifier 102, a second rectifier 103, and an inverter 104. The input end of the first rectifier 102 is electrically connected to the battery 101, and the output end of the first rectifier 102 is electrically connected to the input end of the inverter 104, wherein the first rectifier 102 is used to convert the high-voltage direct current output by the battery 101 into low-voltage direct current, and output it to the inverter 104. The input end of the second rectifier 103 is electrically connected to the well site transformer, and the output end of the second rectifier 103 is electrically connected to the input end of the inverter 104, wherein the second rectifier 103 is used to convert the alternating current of the power grid into direct current, and output it to the inverter 104.

[0109] The first rectifier 102 is a DC (Direct Current) / DC (Direct Current) rectifier, and the second rectifier 103 is an AC (Alternating Current) / DC (Direct Current) rectifier. The input and output ends of the first rectifier 102 are both DC sides, and the input end of the second rectifier 103 is the AC side and the output end is the DC side.

[0110] The output end of the inverter 104 is electrically connected to the pipe string tripping device 2. When the power of the well site transformer is greater than the load power of the first motor 212, the first rectifier 102 is disconnected from the battery 101. When the power of the well site transformer is less than the load power of the first motor 212, the first rectifier 102 is energized with the battery 101, so that the pipe string tripping device 2 can work under different power supply conditions. In this way, the well repair operation can be realized with pure electric power, which effectively solves the problems of high diesel power consumption and serious pollutant emissions in traditional well repair machines.

[0111] The battery 101 may be a lithium titanate battery.

[0112] The power supply system 10 provided in the embodiment of the present disclosure can enable high-power motors to operate at full load or even overload under a low-capacity transformer, stabilize the grid voltage, reduce the interference to the grid caused by frequent startup, reduce equipment energy consumption, and facilitate transplantation and promotion to other engineering equipment such as lifting equipment.

[0113] In some examples, such as Figure 1 As shown, the workover rig further includes an operation room 11, and the control system 7 is located in the operation room 11. Therefore, the operation room 11 can realize centralized control of electricity, gas, and liquid, and has a one-button workover operation function, realizing unmanned wellhead operation, automatic pipe rod buckling, and automatic pipe lifting and lowering. In this way, the staff can complete the workover operation by directly operating the control system 7 in the operation room 11, thereby reducing the labor intensity.

[0114] In addition, since the workers do not need to work outdoors, the workover rig can be used in various environments.

[0115] In some examples, the work platform at the wellhead also has a ring array of TMR (Tunnel Magneto Resistance) for detecting the pipe string. When the pipe string is lifted or lowered, the pipe string will pass through the ring array of TMR, so that the TMR can perform flaw detection on the pipe string, realize contact-type high-precision pipe string defect detection, thereby timely discovering faults and avoiding problems such as oil leakage caused by pipe string faults.

[0116] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A workover rig, characterized in that: The workover rig comprises a chassis (1), a pipe string tripping device (2), a vertical pipe row box (3), a mechanical arm (4), slips (5), a spindle assembly (6) and a control system (7); The pipe column tripping device (2) is located on the chassis (1); The vertical pipe arrangement box (3) and the mechanical arm (4) are located on one side of the chassis (1), and the vertical pipe arrangement box (3) is used to vertically hold pipe columns; The slips (5) and the spindle assembly (6) are located at the wellhead; During the pipe lifting process, the control system (7) is configured to: Controlling the pipe string lifting and lowering device (2) to lift the first pipe string until the first pipe string reaches the shackle position, wherein the bottom end of the first pipe string is connected to the top end of the second pipe string; controlling the slips (5) to clamp the second pipe string; Controlling the spinner assembly (6) to detach the first pipe string and the second pipe string; Controlling the pipe string lifting and lowering device (2) to lift the first pipe string; controlling the mechanical arm (4) to clamp the first pipe column; Controlling the pipe string tripping device (2) to release the first pipe string; The mechanical arm (4) is controlled to place the first pipe column in the vertical pipe arrangement box (3).

2. The workover rig according to claim 1, characterized in that: During the tube lowering process, the control system (7) is further configured to: Controlling the slips (5) to clamp the fourth pipe string, wherein the top end of the fourth pipe string is connected to the bottom end of the third pipe string; Controlling the mechanical arm (4) to transfer the first pipe string from the vertical pipe row box (3) to the pipe string tripping device (2); Controlling the mechanical arm (4) to release the third pipe string; Controlling the pipe string tripping device (2) to lower the third pipe string until the bottom end of the third pipe string is aligned with the top end of the fourth pipe string; Controlling the buckle assembly (6) to buckle the third pipe column and the fourth pipe column; Controlling the slip (5) to release the fourth pipe string; The pipe string tripping device (2) is controlled to lower the third pipe string.

3. The workover rig according to claim 1, characterized in that: The vertical pipe arrangement box (3) has a pipe column groove (30) inside, and the axial direction of the pipe column groove (30) is parallel to the vertical direction.

4. The workover rig according to claim 1, characterized in that: The pipe string tripping device (2) comprises a direct drive winch (21), a derrick (22) and an elevator (23); The steel wire rope of the direct drive winch (21) is connected to the elevator (23), and the steel wire rope is slidably connected to the top of the derrick (22); The elevator (23) is used to clamp the pipe column; The direct drive winch (21) is used to lift or lower the pipe column clamped by the elevator (23) by rotating.

5. The workover rig according to claim 3, characterized in that: The direct-drive winch (21) comprises a frame (211), a first motor (212), a rotating shaft (213) and a roller (214); The vehicle frame (211) is fixed to the chassis (1), the first motor (212) is fixed to the vehicle frame (211), the output shaft (2121) of the first motor (212) is a hollow shaft, and the rotating shaft (213) is located inside the output shaft (2121) and is drivingly connected to the output shaft (2121); The rotating shaft (213) is drivingly connected to the roller (214).

6. The workover rig according to claim 4, characterized in that: The workover rig further comprises an emergency power device (8), wherein the emergency power device (8) comprises a second motor (81) and a first gear (82), and the second motor (81) is transmission-connected to the first gear (82); The direct-drive winch (21) further comprises a second gear (215), wherein the second gear (215) is transmission-connected to the rotating shaft (213); When the first motor (212) is working, the first gear (82) and the second gear (215) are separated; When the first motor (212) fails, the first gear (82) meshes with the second gear (215), and the second motor (81) drives the first gear (82) to rotate.

7. The workover rig according to claim 6, characterized in that: The diameter of the first gear (82) is smaller than the diameter of the second gear (215).

8. The workover rig according to claim 1, characterized in that: The workover rig also includes a spraying device (9); After controlling the spinner assembly (6) to detach the first pipe string and the second pipe string, the control system (7) is further configured to: The rush spray device (9) is controlled to block the bottom end of the first pipe column.

9. The workover rig according to any one of claims 1 to 8, characterized in that: The workover rig further comprises a power supply system (10), wherein the power supply system (10) comprises a battery (101), a first rectifier (102), a second rectifier (103) and an inverter (104); The input end of the first rectifier (102) is electrically connected to the battery (101), and the output end of the first rectifier (102) is electrically connected to the input end of the inverter (104), wherein the first rectifier (102) is used to convert the high-voltage direct current output by the battery (101) into low-voltage direct current, and output it to the inverter (104); The input end of the second rectifier (103) is electrically connected to the well site transformer, and the output end of the second rectifier (103) is electrically connected to the input end of the inverter (104), wherein the second rectifier (103) is used to convert the alternating current of the power grid into direct current and output it to the inverter (104); The output end of the inverter (104) is electrically connected to the pipe string tripping device (2); When the power of the well site transformer is greater than the load power of the pipe string tripping device (2), the first rectifier (102) is disconnected from the battery (101); When the power of the well site transformer is less than the load power of the pipe string tripping device (2), the first rectifier (102) and the battery (101) are powered on.

10. The workover rig according to any one of claims 1 to 8, characterized in that: The workover rig further comprises an operation room (11), and the control system (7) is located in the operation room (11).

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