A work implement with pressure and a control method thereof

Abstract

The application discloses a kind of with pressure operating device and its control method, for with pressure well repair pipe column operation, including mobile slip group, mobile crossbeam, lifting oil cylinder, fixed slip group and lower working platform;Mobile slip group includes mobile anti-top cone slip, mobile bearing cone slip, mobile universal slip by first connecting piece connection;Fixed slip group includes fixed anti-top cone slip, fixed bearing cone slip, fixed universal slip by second connecting piece connection;Mobile universal slip and fixed universal slip are used for in the state of pipe column suspended weight as neutral point state alternately operation;Mobile bearing cone slip and fixed bearing cone slip are used for in the state of pipe column suspended weight as heavy pipe column alternately operation;Mobile anti-top cone slip and fixed anti-top cone slip are used for in the state of pipe column suspended weight as light pipe column alternately operation.The application can improve the safety of pipe column operation, simplify operation, improve operation efficiency, reduce labor intensity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil and gas field well repair operation under pressure, in particular to a device for operation under pressure and a control method thereof. BACKGROUND

[0002] The oil and gas wells need to be repaired during the working period. The oil and gas wells in normal operation have high well pressure, and need to use a device for operation under pressure. The current device for operation under pressure mainly includes a pipe string control slip group. According to different well media and well depth, the slip used is divided into universal slip and conical self-tightening slip. The universal slip is suitable for the device for operation under pressure of the oil and gas well with a well depth of not more than 2000m and a well pressure of not more than 21MPa. The conical self-tightening slip can realize large tonnage load lifting and pressing through the combination of "bearing + anti-jacking". The current textbooks and products in the industry use one of the slips as the pipe string control slip. Such slip has certain safety risks.

[0003] The holding force of the universal slip is formed by the horizontal cylinder horizontal pushing force to extrude the pipe string to generate friction force, so as to realize the clamping control of the pipe string. If the control of the pipe string is to be released, the horizontal cylinder is only needed to be retracted to release the extrusion. The maximum bearing capacity of the slip is related to the horizontal pushing force of the cylinder. Due to the structure limitation, the maximum holding force of the slip is generally less than 600kN. Since the cylinder itself has internal leakage, the pressure will be lost after the accidental failure of the horizontal cylinder, thereby causing the loss of control of the pipe string.

[0004] The holding force of the conical self-tightening slip is the friction force generated by the force applied to the slip tooth plate. The force makes the tooth plate and the slip seat have a tendency to slide along the direction of the force. When the tooth plate and the slip seat slide, the slip seat drives the tooth plate to extrude the pipe string inward by means of the conical slope, so that the holding force of the slip to the pipe string becomes larger and larger with the extrusion, so that the pipe string can be well controlled. The movement of the tooth plate and the slip seat is also realized by the pushing and pulling or swinging of the cylinder. The pushing and pulling of the cylinder is only to make the slip tooth plate contact the pipe string. Once the tooth plate contacts the pipe string, the heavy load control of the pipe string is realized through the conical self-tightening function. The clamping force of the slip is related to the gravity or jacking force applied to the slip tooth plate. If the clamping force is too large, the slip load transfer needs to be carried out before the slip switching. The specific reason and transfer method are described in the related patent (CN116733389B). The automatic transfer technology in the related file has no problem in the application of automatic equipment. Once manual operation is needed, the transfer technology has high requirements for the operation level of the operator.

[0005] Therefore, how to create a more safe, simple and efficient device for operation under pressure and a control method thereof has become an urgent improvement target in the current industry. SUMMARY

[0006] The technical problem solved by the present application is to provide a pressurized operation device and a control method thereof, which can improve the safety during pipe string tripping operation, simplify the number of slips operation actions, improve operation efficiency, and reduce labor intensity.

[0007] To solve the above technical problem, the present application adopts the following technical scheme:

[0008] The present application provides a pressurized operation device for pressurized well repair pipe string tripping operation, which comprises a traveling slip group, a traveling beam, a lifting oil cylinder, a fixed slip group, and a lower working platform; the traveling slip group is fixed on the traveling beam, the fixed slip group is fixed on the upper part of the lower working platform, the bottom of the lifting oil cylinder is connected with the lower working platform, and the top of the lifting oil cylinder is connected with the traveling beam; the traveling slip group comprises a traveling anti-jacking conical slip, a traveling load-bearing conical slip, and a traveling universal slip connected through a first connecting member; and the fixed slip group comprises a fixed anti-jacking conical slip, a fixed load-bearing conical slip, and a fixed universal slip connected through a second connecting member.

[0009] It also comprises a load detection unit for detecting the pipe string load; the load detection unit is installed between the traveling slip group and the traveling beam; and the pipe string load is used to judge the pipe string hanging state.

[0010] The traveling universal slip and the fixed universal slip are used for alternate operation when the pipe string hanging state is a neutral point state; the traveling load-bearing conical slip and the fixed load-bearing conical slip are used for alternate operation when the pipe string hanging state is a heavy pipe string state; and the traveling anti-jacking conical slip and the fixed anti-jacking conical slip are used for alternate operation when the pipe string hanging state is a light pipe string state.

[0011] Further, in the traveling slip group, the first connecting member is a first connecting fixed frame, the traveling anti-jacking conical slip and the traveling load-bearing conical slip are arranged oppositely, and are connected into a whole through the first connecting fixed frame; and the bottom of the first connecting fixed frame is fixed on the upper part of the traveling universal slip.

[0012] The load detection unit comprises a load sensor, a load transition plate, and a load transmission bolt; the traveling universal slip is connected with the load transition plate; the load transmission bolt connects the load transition plate with the load sensor; the load sensor is connected and fixed on the traveling beam; and the load sensor bears the action force in two directions of tension and pressure.

[0013] The second connecting member is a second connecting fixed frame, the fixed anti-jacking conical slip and the fixed load-bearing conical slip are arranged oppositely, and are connected into a whole through the second connecting fixed frame; and the bottom of the second connecting fixed frame is fixed on the upper part of the fixed universal slip.

[0014] Further, in the traveling slip assembly, the first connecting member is a bearing central pipe, the bearing central pipe passes through the traveling cross beam, the lower part of the bearing central pipe is connected with the traveling anti-top cone slip, the upper part of the bearing central pipe is connected with the traveling universal slip and the traveling bearing cone slip in sequence, and the traveling anti-top cone slip is arranged opposite to the traveling bearing cone slip.

[0015] The load detection unit comprises a load sensor, a load transition plate and a load transmission bolt, the load transition plate is located on the upper part of the bearing central pipe, and the load transition plate and the load sensor are connected in an integral or split connection structure, the load transmission bolt connects the load transition plate with the load sensor, the load sensor is connected and fixed on the traveling cross beam, and the load sensor bears the forces in two directions of tension and pressure.

[0016] Further, the load sensor is a bidirectional mechanical weighing sensor or a hydraulic pressure transmitter.

[0017] Further, the state detection sensor is arranged on each slip in the traveling slip assembly and the fixed slip assembly, and is used for detecting the opening or closing state of each slip in real time.

[0018] Further, the control system comprises a control unit, the control unit is a manual or automatic control execution unit, and is used for judging the pipe string hanging state according to the load data detected by the load detection unit and controlling the switching action of the traveling slip assembly and the fixed slip assembly.

[0019] Further, the control system further comprises a load detection display unit, and the load detection display unit is used for displaying the load data detected by the load detection unit.

[0020] Further, the bottom of the fixed slip assembly is further provided with an annular blowout preventer, and the annular blowout preventer is located between the bottom of the fixed slip assembly and the lower working platform.

[0021] The bottom of the lower working platform is further fixedly connected with a working blowout preventer.

[0022] The snubbing device further comprises a standard heightening short section and a wellhead fixed platform, and the working blowout preventer is connected with the wellhead fixed platform into an integral whole through the standard heightening short section.

[0023] Further, an upper frame working platform is arranged outside the traveling slip assembly and the traveling cross beam.

[0024] The upper frame working platform and the lower working platform are connected through a hollow stand column, and the lifting oil cylinder passes through the hollow stand column.

[0025] The application also provides a control method of the snubbing device, when the pipe string hanging state is detected as the neutral point state, the universal slip operation mode is adopted, and the traveling universal slip and the fixed universal slip are alternately operated;

[0026] When the pipe string hanging state is detected as the heavy pipe string state, the bearing slip operation mode is adopted, and the traveling bearing slip and the fixed bearing slip are alternately operated;

[0027] When the pipe string hanging state is detected as the light pipe string state, the anti-jacking slip operation mode is adopted, and the traveling anti-jacking slip and the fixed anti-jacking slip are alternately operated.

[0028] By adopting the technical scheme, the application has at least the following beneficial effects:

[0029] The snubbing device has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0030] The above is only a summary of the technical scheme of the application, and the application will be further described in detail below in combination with the drawings and specific embodiments.

[0031] Figure 1 is a schematic diagram of the overall structure of a snubbing device in an embodiment of the application;

[0032] Figure 2 is a schematic diagram of the configuration structure of a traveling slip group in one form in an embodiment of the application;

[0033] Figure 3 is a schematic diagram of the configuration structure of a fixed slip group in an embodiment of the application;

[0034] Figure 4 is a schematic diagram of the configuration structure of a traveling slip group in another form in an embodiment of the application;

[0035] Figure 5 is a schematic diagram of a bearing center pipe structure (including a load transition plate) in an embodiment of the application;

[0036] Figure 6 This is a control principle diagram in an embodiment of the present invention;

[0037] In the diagram: 1-Wellhead working platform; 11-Wandering slip assembly; 1101-First connecting frame; 1102-Bearing center pipe; 111-Wandering anti-overhead conical slip; 112-Wandering load-bearing conical slip; 113-Wandering universal slip; 12-Wandering crossbeam; 13-Lifting cylinder; 14-Fixed slip assembly; 140-Second connecting frame; 141-Fixed anti-overhead conical slip, 142-Fixed load-bearing conical slip, 143-Fixed universal slip; 15-Lower working platform; 16-Load detection unit; 161-Load sensor; 162-Load transition plate; 163-Load transfer bolt; 17-Annular blowout preventer; 18-Working blowout preventer; 19-Upper frame working platform; 2-Standard heightened short section; 3-Wellhead fixed platform; 4-Control system. Detailed Implementation

[0038] This embodiment provides a live-line workover device for live-line well workover operations, such as... Figure 1 As shown, the wellhead working platform 1 includes a traveling slip assembly 11, a traveling crossbeam 12, a lifting cylinder 13, a fixed slip assembly 14, and a lower working platform 15. The traveling slip assembly 11 is fixed to the traveling crossbeam 12; the fixed slip assembly 14 is fixed to the upper part of the lower working platform 15; the bottom of the lifting cylinder 13 is connected to the lower working platform 15, and the top of the piston rod of the lifting cylinder 13 is connected to the traveling crossbeam 12.

[0039] Figure 2 A schematic diagram of a configuration structure for a type of mobile chuck assembly, such as... Figure 2 As shown, the movable slip assembly 11 includes a movable anti-overturning conical slip 111, a movable load-bearing conical slip 112, and a movable universal slip 113 connected by a first connecting member (here, a first connecting bracket 1101). Preferably, the movable anti-overturning conical slip 111 and the movable load-bearing conical slip 112 are arranged facing each other and connected as a whole by the first connecting bracket 1101. The bottom of the first connecting bracket 1101 is fixed to the upper part of the movable universal slip 113. Specifically, the lower flange of the first connecting bracket 1101 is connected to the shell of the movable universal slip 113 by a threaded connection or a connecting flange.

[0040] Cooperate Figure 3As shown, the fixed slip group 14 includes a fixed anti-top cone slip 141, a fixed load-bearing cone slip 142, and a fixed universal slip 143 connected by a second connecting fixing frame 140; as preferred, the fixed anti-top cone slip 141 is arranged opposite to the fixed load-bearing cone slip 142, and connected into an integral whole by the second connecting fixing frame 140; the bottom of the second connecting fixing frame 140 is fixed on the upper part of the fixed universal slip 143.

[0041] Through the above arrangement, the traveling universal slip 113 and the fixed universal slip 143 are used for alternate operation when the pipe string hanging state is the neutral point state; the traveling load-bearing cone slip 112 and the fixed load-bearing cone slip 142 are used for alternate operation when the pipe string hanging state is the heavy pipe string state; the traveling anti-top cone slip 111 and the fixed anti-top cone slip 141 are used for alternate operation when the pipe string hanging state is the light pipe string state.

[0042] In order to determine the pipe string hanging state, the load detection unit 16 is matched with Figure 2 As shown, the above pressure operation device further includes a load detection unit 16 for detecting the load of the pipe string; the load detection unit 16 is installed between the traveling slip group 11 and the traveling beam 12. The load detection unit includes a load sensor 161, a load transition plate 162, and a load transmission bolt 163; the lower flange of the traveling universal slip 113 at the bottom of the traveling slip group 11 is connected with the load transition plate 162; the load transmission bolt 163 connects the load transition plate 162 with the load sensor 161, and the load sensor 161 is fixedly connected with the traveling beam 12; the load sensor 161 bears the acting force in two directions of tension and pressure. The load transmission bolt 163, through its structural features (which can be a tapered inclined surface or a shaft shoulder), transmits the force of the pipe string acting on the traveling universal slip 113 to the load sensor 161 by means of a matched nut, and the load sensor 161 converts the tension or pressure received into a related signal and sends it to the control system 4 to determine the pipe string hanging state.

[0043] In the above embodiment, the fixed slip group 14 and the traveling slip group 11 are both composed of load-bearing cone slips, anti-top cone slips, and universal slips. The structural form of the cone slip is not limited, which can be a 375(C) slip or a circular slip (as mentioned in CN116733389B). The position sequence of the three slips can also be adjusted according to the actual working conditions.

[0044] Figure 4 As shown, it is a schematic diagram of another form of traveling slip group configuration structure, such as Figure 4As shown, in the traveling slip assembly, the first connecting member adopts a bearing center pipe 1102, the bearing center pipe 1102 passes through the traveling cross beam 12, the lower part of the bearing center pipe 1102 is connected with the traveling anti-top cone slip 111; the upper part of the bearing center pipe 1102 is connected with the traveling universal slip 113 and the traveling bearing cone slip 112 in sequence; the traveling anti-top cone slip 111 is arranged opposite to the traveling bearing cone slip 112.

[0045] With Figure 4 The load detection unit matched with the traveling slip assembly includes a load sensor 161, a load transition plate 162 and a load transmission bolt 163. Here, the load transition plate 162 is located on the upper part of the bearing center pipe 1102, and the two are an integrated or split connecting structure (such as Figure 5 As shown); the load transmission bolt 163 connects the load transition plate 162 with the load sensor 161, the load sensor 161 is connected and fixed on the traveling cross beam 12; the load sensor 161 bears the forces in two directions of tension (anti-top load) and pressure (bearing load).

[0046] The type and detection method of the load sensor 161 in the above load detection unit 16 are not limited, which can be a hydraulic pressure transmitter or a bidirectional mechanical weighing sensor. As mentioned above, the bidirectional mechanical weighing sensor is adopted in the present example, three bidirectional mechanical weighing sensors are arranged between the traveling cross beam 12 and the traveling slip assembly 11, and the pipe string state can be detected through the traveling slip assembly 11.

[0047] The state detection sensor is further arranged on each slip (three types of slips) in the above traveling slip assembly 11 and the fixed slip assembly 14, for real-time detection of the opening or closing state of each slip.

[0048] Cooperating Figure 1 As shown, the above pressure operation device further includes a control system 4, the control system 4 includes a load detection display unit and a control unit, the load detection display unit is used for displaying the load data detected by the load detection unit; the control unit is a manual or automatic control execution unit, which can control the target unit to realize the set action, such as being used for judging the pipe string hanging weight state according to the load data detected by the load detection unit and controlling the switching action of the traveling slip assembly and the fixed slip assembly. The automatic electro-hydraulic control execution unit is adopted in the present example, the data of the bidirectional mechanical weighing sensor is automatically switched by the PLC to execute the unit action. The switching action can be judged by the state detection sensor.

[0049] Combined Figure 1 , 3As shown, the bottom of the fixed slip group 14 is also provided with an annular blowout preventer 17 located between the bottom of the fixed slip group 14 and the lower working platform 15; the bottom of the lower working platform 15 is also fixedly connected with a working blowout preventer 18; an upper frame working platform 19 is arranged outside the traveling slip group 11 and the traveling beam 12; the upper frame working platform 19 is connected with the lower working platform 15 through a hollow column; the lifting oil cylinder 13 passes through the hollow column.

[0050] The above-mentioned snubbing device also comprises a standard heightening nipple 2 and a wellhead fixed platform 3; the standard heightening nipple 2 is a fixed-length upper and lower flange pressure-resistant nipple, which belongs to a conventional technology; the working blowout preventer 18 is connected with the wellhead fixed platform 3 through the standard heightening nipple 2 to form an integral whole.

[0051] Cooperation Figure 1 As shown, the above-mentioned snubbing device, in the construction preparation stage, after the wellhead fixed platform 3 is fixedly connected with the wellhead, the lower flange of the standard heightening nipple 2 is connected with the top flange of the wellhead fixed platform 3, then the wellhead working platform 1 is hoisted and butted with the standard heightening nipple 2 to complete the positioning and installation of the wellhead working platform 1, at the same time, the wellhead working platform 1 is stabilized by using a taut rope, and the control system 4 is placed according to the actual situation of the site, and is connected with the control box on the wellhead working platform 1 or the wellhead fixed platform 3 through a wire harness to realize the data transmission between the control system 4 and the main machine.

[0052] When the snubbing main machine is working, according to the pipe string tripping procedure, it can be divided into pipe tripping operation and pipe running operation. The pipe string hanging weight state is divided into light pipe string state, heavy pipe string state and neutral point state.

[0053] Cooperation Figure 6 As shown, the control method of the above-mentioned snubbing device is as follows: when the pipe string hanging weight state is detected as the neutral point state, a universal slip operation mode is adopted, and the traveling universal slip and the fixed universal slip are alternately operated; when the pipe string hanging weight state is detected as the heavy pipe string state, a load-bearing slip operation mode is adopted, and the traveling load-bearing conical slip and the fixed load-bearing conical slip are alternately operated; when the pipe string hanging weight state is detected as the light pipe string state, a anti-jacking conical slip operation mode is adopted, and the traveling anti-jacking conical slip and the fixed anti-jacking conical slip are alternately operated.

[0054] Next, the pipe tripping operation procedure is described in detail:

[0055] Pipe lifting operation: when the pipe lifting operation is performed, the pipe string hanging weight state is judged according to the pipe string hanging weight. When the pipe string hanging weight state is a heavy pipe string state, the pipe string lifting safety operation is realized by the alternating operation of the traveling load-bearing conical slips 112 and the fixed load-bearing conical slips 142. At this time, only the fixed load-bearing conical slips 142 and the traveling load-bearing conical slips 112 need to be operated. With the pipe string being lifted out, the pipe string hanging weight gradually approaches the neutral point. The load sensor 161 monitors the change of the pipe string hanging weight in real time to judge the hanging weight state. Once the neutral point state is reached, the control system 4 sends a prompt, and the state can be automatically or manually switched: the universal slip operation mode is switched.

[0056] After the universal slip operation mode is switched, the fixed load-bearing conical slips 142 and the traveling load-bearing conical slips 112 are stopped, and the universal slips are enabled for pipe string control. At this time, the traveling universal slips 113 and the fixed universal slips 143 are alternately operated to realize the pipe string lifting safety operation. At this time, only the fixed universal slips 143 and the traveling universal slips 113 need to be operated to ensure the safety of the pipe string control. At this time, whether the pipe string has a falling trend or a top-up trend, the universal slips can well complete the motion control of the pipe string, which completely avoids the risk of slip locking and cannot be opened when the original conical slips need to be transferred for slip switching operation, reduces the operation action (four groups of conical slips need to be controlled for switching, and now only two groups of universal slips need to be controlled for switching), reduces the labor intensity of the operator, and reduces the operation risk. With the reduction of the pipe string hanging weight, the load sensor 161 monitors the change of the pipe string hanging weight in real time to judge the hanging weight state. Once the light pipe string state is reached, the control system 4 sends a prompt, and the state can be automatically or manually switched: the anti-top-up slip operation mode is switched.

[0057] After the anti-top-up slip operation mode is switched, the universal slip operation is stopped, and the fixed anti-top-up conical slips 141 and the traveling anti-top-up conical slips 111 are enabled for pipe string lifting control. At this time, the traveling anti-top-up conical slips 111 and the fixed anti-top-up conical slips 141 are alternately operated to realize the pipe string lifting safety operation.

[0058] The pipe lowering operation process is opposite to the lifting operation process, and will not be described again.

[0059] In summary, the under-pressure operation device and the control method thereof can be used for under-pressure well repair pipe lifting and lowering operation, especially for pipe string lifting and lowering control operation when the pipe string hanging weight is in the neutral point state, which simplifies the operation, improves the safety of pipe string lifting and lowering operation, improves the operation efficiency, and reduces the labor intensity.

[0060] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Those skilled in the art can make some simple modifications, equivalent changes or modifications to the disclosed technical contents, which all fall within the protection scope of the present application.

Claims

1. A live-work operation device for live-work operation involving running and pulling tubing, comprising a moving slip assembly, a moving crossbeam, a lifting cylinder, a fixed slip assembly, and a lower working platform; wherein the moving slip assembly is fixed to the moving crossbeam, the fixed slip assembly is fixed to the upper part of the lower working platform, and the bottom of the lifting cylinder is connected to the lower working platform, and the top is connected to the moving crossbeam; characterized in that... The movable slip assembly includes a movable anti-overturning conical slip, a movable load-bearing conical slip, and a movable universal slip connected by a first connector; the fixed slip assembly includes a fixed anti-overturning conical slip, a fixed load-bearing conical slip, and a fixed universal slip connected by a second connector. It also includes a load detection unit for detecting the load on the tubing column; the load detection unit is installed between the moving slip assembly and the moving crossbeam; the tubing column load is used to determine the suspension state of the tubing column; The movable universal clamp and the fixed universal clamp are used alternately when the tube string is in a neutral state under suspension; the movable load-bearing conical clamp and the fixed load-bearing conical clamp are used alternately when the tube string is in a heavy tube string state under suspension; the movable anti-overhead conical clamp and the fixed anti-overhead conical clamp are used alternately when the tube string is in a light tube string state under suspension. In the movable slip assembly, the first connecting member is a first connecting fixing frame. The movable anti-overhead conical slip and the movable load-bearing conical slip are arranged facing each other and connected as a whole by the first connecting fixing frame. The bottom of the first connecting fixing frame is fixed to the upper part of the movable universal slip. Correspondingly, the load detection unit includes a load sensor, a load transition plate, and a load transmission bolt. The movable universal slip is connected to the load transition plate. The load transmission bolt connects the load transition plate to the load sensor, and the load sensor is connected and fixed to the movable crossbeam. The load sensor bears forces in both tensile and compressive directions. In the aforementioned movable slip assembly, the first connecting member is a load-bearing central tube, which passes through the movable crossbeam. The lower part of the load-bearing central tube is connected to a movable anti-overturning conical slip. The upper part of the load-bearing central tube is sequentially connected to a movable universal slip and a movable load-bearing conical slip. The movable anti-overturning conical slip and the movable load-bearing conical slip are arranged opposite to each other. Correspondingly, the load detection unit includes a load sensor, a load transition plate, and a load transfer bolt. The load transition plate is located on the upper part of the load-bearing central tube, and the two are either integral or separate connected structures. The load transfer bolt connects the load transition plate to the load sensor, and the load sensor is fixedly connected to the movable crossbeam. The load sensor bears forces in both tensile and compressive directions.

2. The live-line working device according to claim 1, characterized in that, The second connecting component is a second connecting fixing frame. The fixed anti-top conical clamp and the fixed load-bearing conical clamp are arranged facing each other and connected into a whole by the second connecting fixing frame. The bottom of the second connecting fixing frame is fixed to the upper part of the fixed universal clamp.

3. The live-line working device according to claim 1, characterized in that, The load sensor is a bidirectional mechanical weighing sensor or a hydraulic pressure transmitter.

4. The live-line working device according to claim 1, characterized in that, Each slip in both the movable slip group and the fixed slip group is equipped with a status detection sensor to detect the open or closed status of each slip in real time.

5. The live-line working device according to claim 1 or 4, characterized in that, It also includes a control system, which includes a control unit. The control unit is a manual or automatic control execution unit used to determine the suspension status of the tubing based on the load data detected by the load detection unit and to control the switching action of the floating slip group and the fixed slip group.

6. The live-line working device according to claim 5, characterized in that, The control system also includes a load detection and display unit, which is used to display the load data detected by the load detection unit.

7. The live-line working device according to claim 1, characterized in that, The bottom of the fixed slip assembly is also equipped with an annular blowout preventer, which is located between the bottom of the fixed slip assembly and the lower working platform. A working blowout preventer is also fixedly connected to the bottom of the lower working platform; The pressurized operation device also includes a standard heightened section and a wellhead fixing platform; the working blowout preventer is connected to the wellhead fixing platform as a whole through the standard heightened section.

8. The live-line working device according to claim 7, characterized in that, An upper frame working platform is provided around the movable slip assembly and the movable crossbeam; The upper frame working platform and the lower working platform are connected by hollow columns; the lifting cylinder passes through the hollow columns.

9. A control method for a live-line working device according to any one of claims 1-8, characterized in that, When the suspension state of the tubing is detected to be at the neutral point, the universal slip operation mode is adopted, in which the mobile universal slip and the fixed universal slip work alternately. When the suspended state of the tubing is detected as a heavy tubing state, the load-bearing slip operation mode is adopted, and the floating load-bearing conical slip and the fixed load-bearing conical slip operate alternately; When the suspension state of the tubing is detected to be a light tubing state, the anti-overhead conical slip working mode is adopted, and the floating anti-overhead conical slip and the fixed anti-overhead conical slip work alternately.

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