CN111911097A - Automatic operation system and operation method for oilfield major workover operation - Google Patents

Abstract

The invention discloses an automatic operation system and an automatic operation method for the large workover operation of an oil field, wherein the system comprises a main drill floor, an auxiliary drill floor and a derrick which are positioned around a well head, wherein a pipe receiving and sending manipulator and an iron roughneck are arranged on the main drill floor and positioned near the well head, and a pneumatic slip is arranged at the position of the well head; an electric racking platform intelligent pipe arrangement system and a traveling block capable of moving up and down along the derrick direction are installed above the derrick, a hydraulic elevator is connected to the lower portion of the traveling block through a hanging ring, and a racking platform manipulator and a finger beam lock are arranged on the electric racking platform intelligent pipe arrangement system; a pipe erecting box and a pipe arranging robot are arranged below the electric racking platform intelligent pipe arranging system on the auxiliary drill floor, and drillers are arranged on the main drill floor and the auxiliary drill floor. The system and the method disclosed by the invention can realize automatic operation, reduce the labor intensity, improve the construction efficiency and the construction safety and reduce the operation cost.

Description

A kind of automatic operating system and operating method for major workover operation in oil field

technical field

The invention relates to an oil field workover operation system, in particular to an automatic operating system and an operation method for an oil field large workover operation.

Background technique

Workover operation is an important link in oilfield development. During the production process of oil and gas wells, the oil well itself often fails such as sand production or blockage near the wellbore, wellbore scaling, reduced oil layer permeability, partial production oil layer depletion, casing damage, etc., and production string thread seepage may also occur. The failure of downhole oil production equipment, such as leakage or falling off, broken or tripped sucker rod, abnormal operation of oil sucking pump, etc., has caused the production of oil wells to be reduced or even stopped. The above faults can only be eliminated through workover operations.

Workover operations are generally divided into two categories: major workover operations and minor workover operations. Among them, major workover operations are characterized by: high engineering difficulty and high technical requirements, large workover equipment must be used, and special equipment tools such as overhaul drill pipes and overhaul turntables can commence to work. Since the content of the overhaul operation requires the tripping and running of the pipe string, the tripping and tripping of the pipe string is the operation form with the highest frequency of work on the workover construction site. The link to realize the mechanization of operation.

Major workover operations currently have the following problems:

(1) The labor intensity is high, and the construction efficiency of the workover operation is low.

(2) The employees work in close proximity to the wellhead, and there are potential safety hazards during the construction process.

(3) There are uncontrollable factors in the human operation process.

(4) The cost of workover and tripping operation is high.

SUMMARY OF THE INVENTION

In order to solve the above-mentioned technical problems, the present invention provides an automatic operating system and an operation method for large workover operations in oil fields, so as to achieve the purpose of automatic operation, reducing labor intensity, improving construction efficiency and construction safety, and reducing operation costs.

For achieving the above object, technical scheme of the present invention is as follows:

An automatic operating system for major workover operations in an oil field, comprising a main drilling floor, an auxiliary drilling floor and a derrick located around a wellhead, wherein a pipe pickup manipulator for picking up and righting a pipe string is installed on the main drilling floor near the wellhead, and a In order to realize the make-up and break-down of the pipe string during the operation of the iron driller, a pneumatic slip for holding the pipe string is installed at the wellhead position; an electric two-story intelligent pipe arrangement system is installed above the derrick and a traveling car that can move up and down along the direction of the derrick. The lower part of the traveling car is connected with a hydraulic elevator through a lifting ring. The electric two-story intelligent pipe arrangement system is provided with a two-story manipulator and a finger beam lock for positioning the pipe string. ; On the auxiliary drill floor, a vertical box for holding the pipe string and a swing pipe robot for placing the pipe string are arranged below the electric two-story intelligent pipe arrangement system. On the main drill floor and the auxiliary drill floor Set up the driller's room for integrated control.

In the above solution, the derrick includes two upper and lower sections that can be retracted up and down, and the electric two-story intelligent pipe arrangement system is fixed on the upper section of the derrick.

An automatic operation method for major workover operations in oilfields, using the above-mentioned automatic operating system for major workover operations in oilfields, including the process of transporting a single pipe string from a catwalk machine to go down the well, taking a single pipe string from drilling and transporting it to the catwalk machine, The process of drilling down the double pipe string from the stand box, and the process of taking the double pipe string from the well and placing it in the stand box.

In the above scheme, the process of transporting a single pipe string from the catwalk machine to go down the well is as follows:

After the catwalk picks the pipe to the lift arm, the lift arm goes up to send the pipe string to the drilling floor, the hydraulic elevator clamps one end of the pipe string and starts to lift, and at the same time, the pipe pick-up manipulator clamps the other end of the pipe string and transfers the pipe string. Go to the top of the wellhead and complete the alignment, then the iron driller starts to make up, make up the pipe string and the inner pipe string of the drilling, and the catwalk machine completes the downward reset action; after the iron driller completes the make-up, the pneumatic slips are opened. , After the hydraulic elevator is lowered to the designated position, the pneumatic slips are closed and clamped to the downhole pipe string to complete the single action process.

In the above scheme, the process of taking a single pipe string from the well and transporting it to the catwalk machine is as follows:

The hydraulic elevator descends to clamp the top of the uppermost pipe string in the well, and the pneumatic slips are opened. After the hydraulic elevator rises to the specified height, the pneumatic slips are closed to clamp the pipe string in the well. The connection buckle between them is opened, the pipe pick-up manipulator grasps the bottom of the pipe string, after the iron driller shatters, the hydraulic elevator rises, the pipe pick-up manipulator sends the pipe string to the lifting arm of the catwalk machine, and the hydraulic elevator loosens. The pipe string is opened, and the catwalk machine transports the pipe string to the ground.

In the above scheme, the drilling process of taking double pipe strings from the stand box is as follows:

After ensuring that the relevant finger beam locks are opened, the top of the pipe string is grasped by the second-floor manipulator and sent to the hydraulic elevator. After the hydraulic elevator is closed, the second-floor manipulator resets, and the swing pipe robot grabs the pipe string from the stand box. At the bottom, the hydraulic elevator lifts a short distance to make the pipe string leave the stand box, and then the swing pipe robot sends the pipe string to the wellhead. After the buckle is finished, the iron driller resets, the pneumatic slips are opened, and the hydraulic elevator is lowered to the designated position, the pneumatic slips are closed and clamped to the downhole pipe string, and the drilling process of taking the pipe string is completed.

In the above scheme, the process of taking double pipe strings from drilling and placing them in the stand box is as follows:

The hydraulic elevator descends to clamp the top of the uppermost pipe string in the well, and the pneumatic slips are opened. After the hydraulic elevator rises to the specified height, the pneumatic slips are closed to clamp the pipe string in the well. The connection buckle between them is opened, the swinging robot grabs the bottom of the pipe string, puts the pipe string in the stand box, the hydraulic elevator goes down, the second-floor manipulator grabs the top of the pipe string, opens the finger beam lock, and the hydraulic elevator opens , the second-story manipulator places the pipe string, and completes the process of taking double pipe strings from the well and placing them in the standing box.

Through the above technical solutions, the automatic operating system and the operating method of the oilfield major workover operation provided by the present invention adopt the integrated design of mechanics, electricity and hydraulics, so that the operator can complete the tripping and make-up and break-out in the driller's room through the integrated control system. It can also conduct real-time monitoring of the status of automation equipment and judgment of potential faults, which enhances the safety of the operation, allows workers to fully exert their decision-making and control capabilities in the rear, and realizes human The interaction with equipment enables people to play a higher leading role in oilfield workover operations and to achieve integrated and harmonious operation with technology.

The present invention has the following beneficial effects:

(1) Greatly save time and labor, reduce labor intensity, and improve the construction efficiency of well workover operations.

(2) The workers work far away from the wellhead, which eliminates the hidden safety hazards of the workers during the wellhead construction process, and improves the operation safety during the construction process.

(3) Reduce the risks and uncontrollable factors in the process of human operation.

(4) Intelligent system equipment can effectively reduce the cost of workover and tripping operations.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required in the description of the embodiments or the prior art.

1 is a schematic diagram of an automated operating system for a large workover operation in an oil field disclosed in an embodiment of the present invention;

Fig. 2 is the enlarged schematic diagram of part A in Fig. 1;

FIG. 3 is an enlarged schematic diagram of part B in FIG. 1 .

In the figure, 1. Main drilling floor; 2. Secondary drilling floor; 3. Derrick; 4. Wellhead; 5. Pipe pick-up manipulator; 6. Pneumatic slips; ; 9, lifting ring; 10, hydraulic elevator; 11, stand box; 12, swing pipe robot; 13, driller's room; 14, iron driller; 15, pipe string; 16, workover vehicle.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

The present invention provides an automatic operating system for major workover operations in oilfields, as shown in FIG. 1 . The system has a high degree of automation and replaces manual handling of pipe strings such as pipe connection, pipe delivery, pipe arrangement, and pipe retrieval. It is suitable for construction operations such as oil pipe and drill pipe lifting and lowering stand.

1. An automatic operating system for major workover operations in oilfields

It includes the main drill floor 1, the auxiliary drill floor 2 and the derrick 3 located around the wellhead. The main drill floor 1 is installed near the wellhead 4 with a pipe pick-up manipulator 5 for picking up and righting the pipe string 15, and for realizing the pipe string in the vicinity of the wellhead 4. During the operation, the iron drillers 14 make up and shackle, and the pneumatic slips 6 for holding the pipe string are installed at the wellhead 4; The traveling car 8 that moves up and down in 3 directions, as shown in Figure 2, the lower part of the traveling car 8 is connected to the hydraulic elevator 10 through the lifting ring 9, and the electric two-story intelligent pipe arrangement system 7 is provided with a two-story manipulator and a second-story manipulator for positioning the pipe string The finger beam lock; on the auxiliary drilling floor 2, a vertical box 11 for holding the pipe string and a swing pipe robot 12 for placing the pipe string are arranged below the electric second-floor intelligent pipe arrangement system 7, and the main drilling floor 1 A driller's room 13 for integrated control is provided on the drill floor 2 and the auxiliary drill floor 2 .

In addition, the system also includes a workover trolley 16 integrated with the derrick 3, which can be used to transport the derrick 3; the main drilling floor 1 and the auxiliary drilling floor 2 are set separately for transportation respectively, and a hydraulic station is arranged below the auxiliary drilling floor 2 (in the figure blocked) to provide hydraulic power to the system. The system is also equipped with a video monitoring system in the driller's room 13, which provides the driller's room operator with a real-time picture of the equipment operation, so that the equipment operation process is intuitive and clearly visible, and the operation safety is enhanced.

As shown in Fig. 3, the pipe pick-up robot 5, the swing pipe robot 12 and the iron driller 14 mainly realize the buffering of the pipe string 15 from the ground to the drilling floor, the automatic movement and discharge of the pipe string 15 on the drilling floor, and the Righting and automatic on and off the buckle and has the functions of strong punching and high-efficiency twisting. Pneumatic slips 6 and hydraulic elevators 10 mainly assist the intelligent two-story intelligent piping system 7 to realize the automatic transfer and discharge of the two-story pipe string, the automatic clamping and positioning of the pipe string, and the automatic combination of the pipe string 15 and the hydraulic elevator 10 and detachment functions. The integrated control system of the driller's house controls the cooperation of various equipment to realize the smooth operation of the entire set of automation equipment for major workover operations.

In the present invention, the derrick 3 includes two upper and lower sections that can be retracted up and down, and the electric two-story intelligent pipe arrangement system is fixed on the upper section of the derrick. When it is to be transported, the upper section of the derrick is lowered, and the electric two-story intelligent pipe arrangement 7 follows. Descending together can reduce the volume and facilitate transportation.

The functions of each part in the present invention are now described:

1. Driller's room

The integrated control system of the driller's room is the real-time operation center of the workover operation automation device. The operation and control of all equipment are realized by the operator using the integrated control system of the driller's room. Unified management in the room integrated control system. The integrated control system of the driller's room provides the driller with a comfortable working environment, a simple operation position, and a convenient observation field, which frees the driller from intense, heavy and simple manual labor, and enables the driller to focus more on the drilling process. , thus effectively ensuring safety and improving production efficiency.

In the driller's room control system, local/remote switching can be performed. The local mode means that the operator uses the joystick and control elements of the driller's room console to control. When switching to the remote control mode, the operator on the field or on the drilling floor can perform the outdoor remote control. operate.

The electric control system in the driller's room consists of electric control cabinet, touch screen, operating handle and connecting cable. Its main functions are: to complete the logic control function, protection function, detection and display function of drilling-related parameters and other auxiliary functions of the automation device for workover operations.

The electric control system in the driller's room consists of electric control cabinet, touch screen, operating handle and connecting cable. Its main functions are: to complete the logic control function, protection function, detection and display function of drilling-related parameters and other auxiliary functions of the automation device for workover operations.

The integrated control system of the driller's house takes the industrial-grade central controller as the core, and uses the field bus control technology to form a Profibus-DP network with key equipment such as catwalk machines, swing pipe robots, iron drillers, and two-story pipe string discharge systems. Realize two-way data transmission between devices, HMI monitors the running status of each system in real time and provides system fault diagnosis information.

The integrated control system of the driller's house displays the operation status of each key equipment through the display screen, and provides various fault diagnosis and alarm information. A digital and information-based management platform is created for the drilling process, which ultimately realizes the fault monitoring of key equipment in the system, and optimizes the control and monitoring of the entire drilling process.

The driller's room adopts a redundant control system for the driller's room with the patent number "2019111616503" previously applied for by the company, which will not be repeated here.

2. Pick-up and drop-off manipulator

The pipe pick-up manipulator is used for lifting the pipe string through a traveling hook or a small pneumatic (hydraulic) winch during the workover process. When the bottom end of the pipe string leaves the drilling rig ramp or pipe string conveying device (power catwalk), the bottom end of the pipe string moves toward the wellhead. When the direction is moved, it is necessary to manually complete the special equipment researched and designed by this process. The device can be operated by wireless remote control or remote console to replace the manual completion of the above operations, reduce the labor intensity of employees, and reduce the risk factor. The pipe pick-up manipulator can catch the pipe string before it leaves the ramp, and slowly send the pipe string to the wellhead position. The auxiliary clamping mechanism of the clamping jaw can effectively clamp the pipe string to realize the precise buckle function. The operation method is remote control operation, and has a PROFIBUS-DP interface, which is convenient to connect with the integrated control system of the driller's room, and can be equipped with a video monitoring system, which can realize the control operation of the pick-up manipulator in the driver's control room. The system control unit can automatically learn to mark the positions of wellheads and catwalks, and the movement process after grasping can be operated with one key.

In this embodiment, the pipe pick-up manipulator adopts a wellhead pipe string pick-up and drop-off device with the patent number "2019111045579" previously applied for by our company, and the specific structure is not repeated here.

3. Swing robot

At present, in the process of lifting and lowering the column in the oil field workover operation, the column is placed from the wellhead to the stand box, and the process of moving from the stand box to the wellhead is realized by 1-2 manual placement. In order to reduce manual labor intensity, enhance operation safety, and improve the HSE supervision system, the swing pipe robot is installed on the drilling floor to solve the back and forth movement of the pipe string between the wellhead and the stand box during the process of lifting and lowering the stand. To replace the manual movement of the pipe string, reduce the labor intensity of employees and reduce the risk factor. The operation method is remote control operation, and has a PROFIBUS-DP interface, which is convenient to connect with the integrated control system of the driller's room, and can be equipped with a video monitoring system, which can realize the control operation of the swinging robot in the control room. The system control unit can automatically learn and mark the positions of the wellhead and the stand box, and locate the wellhead and stand box with one key during the movement process after grabbing.

The swinging robot in this embodiment adopts a foldable swinging robot on the drilling floor previously applied for by our company with the patent number "2019110858967", and the specific structure is not repeated here.

4. Iron Driller

The iron driller adopts modular design, compact structure and full hydraulic drive. It needs to be fixed on the working surface before use. The telescopic arm structure and the rotating mechanism enable the iron driller to put its working mechanism in the standby/parking (telescopic) position with the wellhead, Switch freely between mouse hole and standby position (rotation). The working mechanism can move in the vertical direction along the guide rail to adapt to the height of the pipe joint in the working position. The limit switch box is equipped with telescopic limit switches corresponding to the wellhead, the mouse hole and the retraction standby respectively, which can ensure the accurate telescopic positioning of the iron driller's working mechanism in the standby position and the working position. The two limit switches installed on the flange of the guide rail assembly correspond to the wellhead and the rat-hole station respectively, which can enable the iron driller's working mechanism to rotate and position accurately when the station is changed.

Iron drillers use a set of V-clamps that can make and break pipe strings of different sizes. When the spinner works, it can automatically center and compensate for the axial displacement of the pipe string joint. The hydraulic tong assembly is composed of a main tong and a back tong. The main tong and the back tong each have a set of clamping mechanisms. The main tong can rotate a certain angle relative to the back tong to complete the tightening or loosening of the thread of the pipe string.

Iron drillers generally use remote consoles or remote controls to operate. The hydraulic control box and control panel assembly are installed on the frame of the iron driller. The hydraulic control box can be opened for manual control when setting torque, clamping pressure or equipment installation, debugging and maintenance. The control panel assembly is equipped with a torque adjustment knob for adjusting the working torque of the hydraulic tongs.

(1) The deduction process:

After the equipment is started, control the telescopic arm to move forward to the wellhead position, then the back tongs clamp the bottom drilling tool, the spinner clamps, and the spinner rotates for pre-tightening, and then the main tong clamps the drilling tools that need to be connected, and then proceed. Buckle up and buckle to a certain torque. After tightening, the main clamp is released, the back clamp is released, and then the telescopic arm returns to the initial position.

(2) Shackle process:

The shackle process is the reverse process of the make-up process. The main difference is: when shattering, when the bottom back tong clamps the drill pipe, the main tong starts to act first, and when the shackle torque of the main tong reaches the specified torque, The spinner starts to drive the pipe string to rotate the shackle. After the shackle is completed, the telescopic arm is retracted, and the whole tong is retracted to the initial position. The above is the process of shackle.

5. Electric two-story intelligent piping system

The second-layer frame body of the electric second-layer intelligent piping system is installed in the proper position of the derrick, and the second-layer robot arm is installed in the tongue table of the second-layer platform to replace the manual discharge of tubing/drill pipe. The operator can control the pipe arrangement system on the workover drilling floor, and does not need to perform high-altitude and high-strength operations on the second-floor platform of 10-20 meters high.

The second-floor manipulator is installed on the second-floor platform, not only is it unobstructed in the stroke of grabbing and discharging the drill pipe, but also it only takes a few minutes to switch from the operation of the pipe row system to the manual operation, and it will not be caused by the failure of the pipe rower system. Workover rig system shutdown.

Each part of the manipulator assembly is driven and powered by a motor. The electronic control system controls the entire equipment. There are two control methods: manual control and automatic control. The two control methods can be switched at any time. The electric control system precisely controls the stroke of the motor by controlling the motor, so as to precisely control the position of each oil pipe or drill pipe, and complete the grab and release of the oil pipe or drill pipe.

A total of 4 motors are installed in the manipulator assembly to control the sliding, rotation, swing arm and grasping actions respectively. Each group of servo motors is controlled by PLC and operates according to the pre-designed program. During this process, the actuator assembly works automatically. . When the manipulator assembly is working automatically, it can be manually stopped at any time in the event of an unexpected situation.

6. Pneumatic slip

Pneumatic slip is a power tool for holding drill pipe and casing. The pneumatic slip is installed in the core hole of the turntable to replace the core of the turntable. The function of opening the column.

The pneumatic slips are located just above the wellhead and are the main equipment for holding the tubing. The pneumatic slips can be automatically opened and closed by pneumatics, and the 2-inch 3-5 inch half-size tubing can be fully adapted by replacing the die to ensure the clamping. reliability. The pneumatic slip has a high degree of automation and can be controlled and operated by the rotary switch of the console, making it safer and more reliable to use. On the slip teeth, a device is provided to prevent the slip teeth from jamming the pipe string, which well solves the possible reverse jam phenomenon when the pipe string is lifted. The power pipeline connection is convenient and quick, and the operation is simple, which greatly improves the construction efficiency and HSE strength. The gas pipeline connection is convenient and quick, and the operation is simple.

7. Hydraulic elevator

The land workover rig is a non-top drive, and the hydraulic elevator is a manually operated elevator. In order to realize the unmanned operation of the two-story platform, reduce the labor intensity of workers, enhance the safety of operation, and reduce the potential risk of manual work at high altitude, use The hydraulic elevator replaces the elevator method of the current manual fastening method.

8. Video surveillance system

The video surveillance system is mainly composed of five explosion-proof cameras, explosion-proof monitoring host, explosion-proof monitor, control keyboard, connecting cables and connectors.

System functions

a. Real-time monitoring function;

b. Video image storage and playback function;

c. Video file backup and export function;

d. Screen segmentation and automatic switching function.

The iron driller, hydraulic elevator, starting slip and electric two-story platform intelligent pipe arrangement system in this embodiment adopts the structure in the prior art, as long as the functions in the present invention can be realized.

2. An automatic operation method for major workover operations in oilfields

Including the process of transporting a single pipe string from the catwalk machine to the downhole, taking a single pipe string from the well and transporting it to the catwalk machine, taking the double pipe string from the stand box and going down the drilling process, and taking the double pipe string from the well and placing it on the stand box process.

1. The process of transporting a single pipe string from the catwalk machine to the well is as follows:

After the catwalk picks the pipe to the lift arm, the lift arm goes up to send the pipe string to the drilling floor, the hydraulic elevator clamps one end of the pipe string and starts to lift, and at the same time, the pipe pick-up manipulator clamps the other end of the pipe string and transfers the pipe string. Go to the top of the wellhead and complete the alignment, then the iron driller starts to make up, make up the pipe string and the inner pipe string of the drilling, and the catwalk machine completes the downward reset action; after the iron driller completes the make-up, the pneumatic slips are opened. , After the hydraulic elevator is lowered to the designated position, the pneumatic slips are closed and clamped to the downhole pipe string to complete the single action process. The entire action process time does not exceed 120s.

2. The process of taking a single pipe string from the well and transporting it to the catwalk machine is as follows:

The traveling block drives the hydraulic elevator down, clamps the top of the uppermost pipe string in the well, opens the pneumatic slip, and after the hydraulic elevator rises to the specified height, the pneumatic slip closes and clamps the pipe string in the well. The connection buckle between the pipe sections is opened, and the pipe pick-up manipulator grabs the bottom of the pipe string. After the iron driller shatters, the hydraulic elevator rises, and the pipe pick-up manipulator sends the pipe string to the lifting arm of the catwalk machine. The elevator releases the pipe string, and the catwalk transports the pipe string to the ground. The entire action process does not exceed 120s.

3. The drilling process of taking double pipe strings from the stand box is as follows:

After ensuring that the relevant finger beam locks are opened, the top of the pipe string is grasped by the second-floor manipulator and sent to the hydraulic elevator. After the hydraulic elevator is closed, the second-floor manipulator resets, and the swing pipe robot grabs the pipe string from the stand box. At the bottom, the hydraulic elevator lifts a short distance to make the pipe string leave the stand box, and then the swing pipe robot sends the pipe string to the wellhead. After the buckle is finished, the iron driller resets, the pneumatic slips are opened, and the hydraulic elevator is lowered to the designated position, the pneumatic slips are closed and clamped to the downhole pipe string, and the drilling process of taking the pipe string is completed. The entire action process does not exceed 120s.

4. The process of taking double pipe strings from the well and placing them in the stand box is as follows:

The hydraulic elevator descends to clamp the top of the uppermost pipe string in the well, and the pneumatic slips are opened. After the hydraulic elevator rises to the specified height, the pneumatic slips are closed to clamp the pipe string in the well. The connection buckle between them is opened, the swinging robot grabs the bottom of the pipe string, puts the pipe string in the stand box, the hydraulic elevator goes down, the second-floor manipulator grabs the top of the pipe string, opens the finger beam lock, and the hydraulic elevator opens , the second-story manipulator places the pipe string, and completes the process of taking double pipe strings from the well and placing them in the standing box. The entire action process does not exceed 120s.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (7)

1. An automatic operation system for large workover operations in oil fields is characterized by comprising a main drill floor, an auxiliary drill floor and a derrick which are positioned around a well head, wherein a pipe receiving and sending manipulator for receiving, sending and righting a pipe column and an iron driller for realizing the make-up and break-out of the pipe column in the operation process are arranged near the well head on the main drill floor, and a pneumatic slip for clamping the pipe column is arranged at the position of the well head; an electric racking platform intelligent pipe arrangement system and a traveling block capable of moving up and down along the derrick direction are installed above the derrick, a hydraulic elevator is connected to the lower portion of the traveling block through a hanging ring, and a racking platform manipulator and a finger lock for positioning a pipe column are arranged on the electric racking platform intelligent pipe arrangement system; the pipe arranging machine is characterized in that a stand box used for containing a pipe column and a pipe arranging robot used for placing the pipe column are arranged below the electric racking platform intelligent pipe arranging system on the auxiliary drill floor, and drillers used for integrated control are arranged on the main drill floor and the auxiliary drill floor.

2. The automatic operation system for oilfield workover operations according to claim 1, wherein the derrick comprises an upper derrick and a lower derrick which can extend and retract up and down, and the electric racking platform intelligent pipe arranging system is fixed on the upper derrick.

3. An automatic operation method for the oilfield major workover operation, which adopts the automatic operation system for the oilfield major workover operation according to claim 1, and is characterized by comprising a single tubular column conveying process from a catwalk machine, a single tubular column conveying process from a drilling well to the catwalk machine, a double tubular column conveying process from a stand box, and a double tubular column conveying process from the drilling well.

4. The automatic operation method for the oilfield major workover operation according to claim 3, wherein the single tubular column conveyed by the catwalk machine is conveyed to the well in the following specific process:

after the catwalk machine picks up the pipe to the lifting arm, the lifting arm moves upwards to convey the pipe column to the surface of a drill floor, the hydraulic elevator starts to lift after clamping one end of the pipe column, meanwhile, the pipe receiving and conveying manipulator clamps the other end of the pipe column, the pipe column is conveyed to the position above a well mouth and is centered, then an iron roughneck starts to buckle, the pipe column and the inner pipe column in the well are buckled, and the catwalk machine finishes the downward reset action; and after the tripping of the iron roughneck is finished, the pneumatic slips are opened, and after the hydraulic elevator descends to a specified position, the pneumatic slips are closed to clamp the tubular column which is lowered into the well, so that the single action process is completed.

5. The automatic operation method for the oilfield major workover operation according to claim 3, wherein the process of taking a single tubular string from a well and conveying the single tubular string to the catwalk machine is as follows:

the hydraulic elevator descends, the top section of a pipe column in a clamping well is clamped, the pneumatic slips are opened, after the hydraulic elevator ascends to a specified height, the pneumatic slips are closed to clamp the pipe column in the well, an iron roughneck starts to break out, a connecting buckle between two sections of pipe columns is opened, a pipe receiving and conveying manipulator grasps the bottom of the pipe column, after the iron roughneck finishes breaking out, the hydraulic elevator ascends, the pipe receiving and conveying manipulator conveys the pipe column to a lifting arm of a catwalk machine, the pipe column is loosened by the hydraulic elevator, and the catwalk machine conveys the pipe column to the ground.

6. The automatic operation method for the oilfield major workover operation according to claim 3, wherein the drilling process of taking two strings from the setback is as follows:

after ensuring that relevant finger lock is opened, snatch the tubular column top and send to in the hydraulic elevator by the platform manipulator of second floor, the closed back platform manipulator of hydraulic elevator resets, the bottom of this tubular column is grabbed from the back box to the pendulum pipe robot simultaneously, the hydraulic elevator short distance promotes, make the tubular column leave the back box of standing, pendulum pipe robot sends the tubular column to the well head afterwards, accomplish the operation of detaining of going up by the iron roughneck after the centering, carry out the knot with this tubular column and interior tubular column of well, after the knot that goes up, the iron roughneck resets, pneumatic slips is opened, after the hydraulic elevator descends to the assigned position, pneumatic slips is closed and is carried the tubular column of having gone into the well, accomplish and get the tubular column and go into the well drilling work flow.

7. The automatic operation method for the oilfield major workover operation according to claim 3, wherein the process of taking two tubular strings from the well and placing the tubular strings in the root box is as follows:

the hydraulic elevator descends, the top section of a pipe column in a clamping well is clamped, the pneumatic slips are opened, after the hydraulic elevator ascends to a specified height, the pneumatic slips are closed to clamp the pipe column in the well, an iron roughneck starts to break out, a connecting buckle between two sections of pipe columns is opened, the pipe arranging robot grabs the bottom of the pipe column, the pipe column is placed in the stand box, the hydraulic elevator descends, the two-layer platform manipulator grabs the top of the pipe column, the fingerboard lock is opened, the hydraulic elevator is opened, the two-layer platform manipulator places the pipe column, and the process of taking two pipe columns from the drilling well and placing the two pipe columns in the stand box is completed.

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