Oil-water well casing corrosion leakage well section treatment device and method based on underground welding

Abstract

The oil-water well casing corrosion leakage well section treatment device comprises a winch fixedly installed on the ground beside a well mouth, the winch is electrically connected with a control cabinet through a wire, and a fixed pulley is fixedly installed over the well mouth; the winch is used for lifting, a steel wire rope below the winch bypasses the fixed pulley, turns, extends into a well mouth and is fixedly connected with an engineering logging instrument, the engineering logging instrument is in two-way signal communication with the control cabinet through a wire, and a multi-arm welding system is fixed under the engineering logging instrument. The multi-arm welding system is in bidirectional signal communication with the control cabinet through a wire. By means of the method, the corrosion leakage position of the casing can be directly welded and repaired, and the purposes of minimum influence on the original well casing and long-acting treatment are achieved. The invention further discloses an oil-water well casing corrosion leakage well section treatment method based on underground welding.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and water well treatment methods, and relates to an oil and water well casing corrosion and leakage treatment device based on downhole welding. The invention also relates to an oil and water well casing corrosion and leakage treatment method based on downhole welding. Background Art

[0002] The problem of oil and water well casing corrosion and leakage not only destroys the oilfield plane injection and production well network, causing the vertical injection and production imbalance, but also directly affects the stable production and production increase in the old area of ​​the oilfield, and has become a problem that needs to be solved in the late stage of development. The main characteristics of oil and water well casing corrosion and leakage are: many leakage points and large vertical span. Conventional casing corrosion and leakage control measures include full-well small casing cementing, expansion pipe patch repair, composite plugging and chemical plugging technology.

[0003] Conventional treatment process measures have poor adaptability to the problem of casing corrosion and leakage, mainly due to serious wellbore shrinkage after treatment, short process validity period, low construction efficiency and high comprehensive cost. The specific manifestations are as follows:

[0004] (1) The small casing cementing of the whole well causes the inner diameter of the wellbore to be significantly reduced, which seriously affects the implementation of subsequent wellbore operations. In addition, the narrow gap cementing easily causes the problem of poor cementing quality, resulting in a short effective period of treatment;

[0005] (2) Expansion patch repair will cause wellbore diameter reduction, affecting subsequent construction operations and the selection of production tubing. In addition, the cost and process risk of long-distance expansion patch repair are high, and its adaptability is considered to be poor from both technical and economic perspectives.

[0006] (3) During the composite plugging process, the annulus between the original well casing and the plugging pipe is small, the cementing quality is poor, and the effective period is short;

[0007] (4) Although the chemical plugging process does not have the problem of casing shrinkage, the plugging success rate of the long-distance corrosion leakage section in the longitudinal direction is low, the effective period is short, and the overall benefit is poor. Summary of the invention

[0008] The purpose of the present invention is to provide an oil and water well casing corrosion and leakage treatment device based on downhole welding, which can directly perform welding repair on the casing corrosion and leakage position, thereby achieving the goal of minimizing the impact on the original well casing and long-term treatment.

[0009] Another object of the present invention is to provide a method for treating a well section with corrosion and leakage of casing in an oil and water well based on downhole welding.

[0010] The technical solution adopted by the present invention is a device for treating a well section with corrosion and leakage of casing in an oil and water well based on downhole welding, comprising a winch fixedly installed on the ground next to a wellhead, the winch being electrically connected to a control cabinet via a wire, a fixed pulley being fixedly installed directly above the wellhead, the winch being used for lifting and the steel wire rope below being turned around the fixed pulley and then extending into the wellhead and fixedly connected to an engineering logging instrument, the engineering logging instrument being connected to the control cabinet via a wire for two-way signal communication, a multi-arm welding system being fixed directly below the engineering logging instrument, and the multi-arm welding system being connected to the control cabinet for two-way signal communication via a wire.

[0011] The present invention is also characterized in that

[0012] The multi-arm welding system includes a downhole welding system working equipment control box fixed directly below the engineering logging instrument. The downhole welding system working equipment control box and the control cabinet are connected to each other by two-way signals through wires. The top of the downhole welding system working equipment control box is fixedly connected with at least three straightening and telescopic structures around the center of the wellhead. The bottom of the downhole welding system working equipment control box is fixedly connected with a rotatable base structure. A welding machine arm is fixed at the bottom of the base structure. A welding gun is fixedly provided on one side of the bottom of the welding machine arm. The welding gun is electrically connected to the downhole welding system working equipment control box through wires. The welding machine arm and the downhole welding system working equipment control box are electrically connected by wires.

[0013] The righting and telescopic structure includes a righting and telescopic block and an electric hydraulic cylinder. At least three electric hydraulic cylinders are fixedly connected around the center of the wellhead on the top of the control box of the working equipment of the downhole welding system. The righting and telescopic block is fixed on the telescopic end of the telescopic piston rod of the electric hydraulic cylinder. The electric hydraulic cylinder is connected to the control box of the working equipment of the downhole welding system through wires via electrical signals.

[0014] The base structure includes a drive motor, which is fixed at the bottom of the control box of the underground welding system working equipment. The output end of the drive motor is away from the control box of the underground welding system working equipment and is connected to a rotating shaft. The base is fixed on the rotating shaft. The base is fixedly connected to the welding machine arm. The drive motor is connected to the control box of the underground welding system working equipment through wire electrical signals.

[0015] Three cameras are evenly installed around the inner wall of the well on the engineering logging instrument to form a circular monitoring system. Each camera is equipped with a fill light, an ultrasonic sensor, and a temperature and humidity sensor. The cameras, fill lights, ultrasonic sensors, and temperature and humidity sensors are all connected to the control cabinet via wires.

[0016] Another technical solution adopted by the present invention is a method for treating a well section with corrosion and leakage of casing in an oil and water well based on downhole welding, and adopts the above-mentioned device for treating a well section with corrosion and leakage of casing in an oil and water well based on downhole welding, specifically: using a control cabinet to control the winch to lift and lower the lifting wire rope, adjusting the downhole depth of the engineering logging instrument to detect the precise position and degree of damage of the casing, and then lowering the multi-arm welding system according to the precise position of the casing damage to weld the damaged part, and specifically implementing it according to the following steps:

[0017] Step 1, preparation before construction: install the oil and water well casing corrosion and leakage treatment device based on downhole welding;

[0018] Step 2: Control the winch to raise and lower the lifting wire rope through the control cabinet, adjust the downhole depth of the engineering logging instrument, use the engineering logging instrument to detect the corrosion and leakage section of the oil and water well to determine the exact location and damage degree of the casing damage, and transmit the above detection data back to the control cabinet to establish a three-dimensional model of the casing damage well in the oil field;

[0019] Step 3, according to the bottom position of the damaged well section detected in step 2, the control cabinet controls the winch to lower the wire rope to lower the welding gun to the bottom position of the damaged well section, and then the control cabinet controls the electric hydraulic cylinder to extend through the downhole welding system working equipment control box, so that the extension of the straightening telescopic block is against the inner wall of the well to realize the straightening and temporary fixation of the multi-arm welding system in the well, and then the control cabinet controls the driving motor to rotate through the downhole welding system working equipment control box, thereby driving the base to rotate and driving the welding machine arm to rotate, and aligning the welding gun with the casing corrosion and leakage position. After welding one position, the control cabinet controls the straightening telescopic block to be retracted, and then the wire rope is lifted, and each corroded position is welded and repaired from bottom to top in turn until the treatment of the entire corroded well section is completed;

[0020] Step 4: After completing the welding repair of the corrosion and leakage positions in the entire wellbore, re-use the engineering logging instrument to detect the welded and repaired well section again, perform secondary three-dimensional modeling, and evaluate the welding repair effect of the corrosion and leakage well section by comparing the detection data before and after the treatment;

[0021] Step 5: If the repair does not meet the requirements for continued use, repeat steps 3 and 4 until the repair meets the requirements. If the repair meets the requirements for continued use, use the power of the workover rig to lower the screw motor and milling cone to expand the welded repaired corrosion and leakage well section to ensure the wellbore diameter.

[0022] In step 2, the engineering logging instrument is used to detect the corrosion and leakage section of the oil and water well to determine the precise location and degree of casing damage, and the above detection data is transmitted back to the control cabinet and imported into the modeling software. Specifically, when the engineering logging instrument is lowered into the well, the fill light and the camera are turned on, and the camera, ultrasonic sensor and temperature and humidity sensor all transmit the collected information back to the control cabinet in real time. Then, computer modeling is used to draw a three-dimensional spatial structure of the damage of the inner wall of the wellbore based on the image information transmitted back by the camera and the ultrasonic information transmitted back by the ultrasonic sensor, and a three-dimensional model of the casing damaged well in the oil field is constructed. The three-dimensional model also includes the temperature and humidity arrangement of the casing damaged well in the oil field.

[0023] In step 3, when treating the damaged casing of the oil field, the control cabinet controls the lifting and lowering of the wire rope according to the three-dimensional model of the damaged casing well established for the first time, so that the multi-arm welding system is aligned with the location of the casing corrosion and leakage, and then welding repairs are performed from bottom to top in sequence.

[0024] The beneficial effects of the present invention are:

[0025] (1) The present invention has high accuracy in detecting the position of oil and water well casing corrosion and leakage, has strong pertinence in welding repair, can restore the original well casing inner diameter after expansion and milling, has low impact on subsequent wellbore operations, has high degree of wellbore integrity restoration, and achieves the goal of long-term treatment of oil and water well casing corrosion and leakage;

[0026] (2) During the welding repair process, the device used has a simple overall structure, simple construction procedures, and high operating efficiency; compared with conventional well repair operations, the cost of treating oil and water well casing corrosion and leakage is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a device for treating a well section of oil and water well casing corrosion and leakage based on downhole welding of the present invention;

[0028] Figure 2 It is a structural schematic diagram of a multi-arm welding system in a device for treating a well section of oil and water well casing corrosion and leakage based on downhole welding of the present invention;

[0029] Figure 3 It is a circuit connection diagram of the device for treating the corrosion and leakage of oil and water well casing based on downhole welding of the present invention;

[0030] Figure 4 The present invention is a flow chart of a method for treating a well section of oil and water well casing corrosion and leakage based on downhole welding.

[0031] In the figure: 1. control cabinet, 2. winch, 3. wellhead, 4. wire rope, 5. engineering logging instrument, 501. camera, 502. fill light, 503. ultrasonic sensor, 504. temperature and humidity sensor, 6. multi-arm welding system, 601. straightening and telescopic structure, 602. downhole welding system working equipment control box, 603. base structure, 604. welding machine arm, 605. welding gun, 606. straightening and telescopic block, 607. electric hydraulic cylinder, 608. base, 609. drive motor, 7. fixed pulley. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Example 1

[0034] The present invention is a device for treating oil and water well casing corrosion and leakage based on downhole welding, and its structure is as follows: Figure 1 and Figure 3 As shown, it includes a winch 2 fixedly installed on the ground next to the wellhead 3, the winch 2 is electrically connected to the control cabinet 1 through a wire, a fixed pulley 7 is fixedly installed directly above the wellhead 3, the winch 2 is used for lifting and the steel wire rope 4 below bypasses the fixed pulley 7 and then extends into the wellhead 3 and is fixedly connected to an engineering logging instrument 5, the engineering logging instrument 5 is connected to the control cabinet 1 through a wire for two-way signal communication, and a multi-arm welding system 6 is fixed directly below the engineering logging instrument 5, and the multi-arm welding system 6 is connected to the control cabinet 1 through a wire for two-way signal communication.

[0035] The welding robot arm 604 and the welding gun 605 of the present invention both adopt an electrically controllable structure, and remote operation is achieved through control.

[0036] like Figure 2 As shown, the multi-arm welding system 6 includes a downhole welding system working equipment control box 602 fixed directly below the engineering logging instrument 5, the downhole welding system working equipment control box 602 and the control cabinet 1 are connected in a two-way signal manner through a wire, the top of the downhole welding system working equipment control box 602 is fixedly connected with at least three straightening telescopic structures 601 around the center of the wellhead, the bottom of the downhole welding system working equipment control box 602 is fixedly connected with a rotatable base structure 603, a welding machine arm 604 is fixed at the bottom of the base structure 603, a welding gun 605 is fixedly provided on one side of the bottom of the welding machine arm 604, the welding gun 605 is linked to the downhole welding system working equipment control box 602 by electrical signals through wires, and the welding machine arm 604 and the downhole welding system working equipment control box 602 are connected by electrical signals through wires.

[0037] The straightening and telescopic structure 601 includes a straightening and telescopic block 606 and an electric hydraulic cylinder 607. At least three electric hydraulic cylinders 607 are fixedly connected to the top of the downhole welding system working equipment control box 602 around the center of the wellhead. The straightening and telescopic block 606 is fixed to the telescopic end of the telescopic piston rod of the electric hydraulic cylinder 607. The electric hydraulic cylinder is connected to the downhole welding system working equipment control box 602 through a wire through an electrical signal.

[0038] The base structure 603 includes a drive motor 609, which is fixed at the bottom of the downhole welding system working equipment control box 602. The output end of the drive motor 609 is away from the downhole welding system working equipment control box 602 and is connected to a rotating shaft. A base 608 is fixed on the rotating shaft. The base 608 is fixedly connected to the welding machine arm 604. The drive motor 609 is connected to the downhole welding system working equipment control box 602 through a wire electrical signal. The base 608 is driven by a drive motor and a rotating shaft to achieve 360° circular rotation, and the rotating shaft is fixedly welded to the base 608.

[0039] Three cameras 501 are evenly installed around the inner wall of the well on the engineering logging instrument 5 to form a circular monitoring system. Each camera 501 is equipped with a fill light 502, an ultrasonic sensor 503 and a temperature and humidity sensor 504. The camera 501, the fill light 502, the ultrasonic sensor 503 and the temperature and humidity sensor 504 are all connected to the control cabinet 1 through wires.

[0040] Example 2

[0041] The present invention adopts the method for treating the corrosion and leakage of oil and water well casing based on downhole welding, adopts the device for treating the corrosion and leakage of oil and water well casing based on downhole welding of embodiment 1, uses the control cabinet 1 to control the winch 2 to lift and lower the lifting wire rope 4, adjusts the downhole depth of the engineering logging instrument 5 to detect the precise position and degree of the casing damage, and then lowers the multi-arm welding system 6 according to the precise position of the casing damage to weld the damaged part, and the process is as follows: Figure 4 As shown, the specific steps are as follows:

[0042] Step 1, preparation before construction: install the oil and water well casing corrosion and leakage treatment device based on downhole welding;

[0043] Step 2, control the winch 2 to lift and lower the lifting wire rope 4 through the control cabinet 1, adjust the downhole depth of the engineering logging instrument 5, use the engineering logging instrument 5 to detect the corrosion and leakage section of the oil and water well to determine the precise location and damage degree of the casing damage, and transmit the above detection data back to the control cabinet 1 to establish a three-dimensional model of the casing damage well in the oil field;

[0044] Step 3, according to the bottom position of the damaged well section detected in step 2, the control cabinet 1 controls the winch 2 to lower the wire rope 4 to lower the welding gun 605 to the bottom position of the damaged well section, and then the control cabinet 1 controls the electric hydraulic cylinder 607 to extend through the downhole welding system working equipment control box 602, so that the extension of the straightening telescopic block 606 is against the inner wall of the well to realize the straightening and temporary fixation of the multi-arm welding system 6 in the well, and then the control cabinet 1 controls the driving motor to rotate through the downhole welding system working equipment control box 602, thereby driving the base 608 to rotate and driving the welding machine arm 604 to rotate, and aligning the welding gun 605 with the casing corrosion leakage position. After welding one position, the control cabinet 1 controls the straightening telescopic block 606 to be retracted, and then the wire rope 4 is lifted, and each corroded position is welded and repaired from bottom to top in turn until the treatment of the entire corroded well section is completed;

[0045] Step 4: After completing the welding repair of the corrosion and leakage positions in the entire wellbore, re-use the engineering logging instrument to detect the welded and repaired well section again, perform secondary three-dimensional modeling, and evaluate the welding repair effect of the corrosion and leakage well section by comparing the detection data before and after the treatment;

[0046] Step 5: If the repair does not meet the requirements for continued use, repeat steps 3 and 4 until the repair meets the requirements. If the repair meets the requirements for continued use, use the power of the workover rig to lower the screw motor and milling cone to expand the welded repaired corrosion and leakage well section to ensure the wellbore diameter.

[0047] In step 1, the winch 2 is fixed to the ground by a long grounding bolt, and the direction of the wire rope is adjusted by a fixed pulley; the control cabinet 1 is connected to the engineering logging instrument and the multi-arm welding system through a wire for two-way signal communication, controls the rotation parameters of the motor inside the winch, including the rotation speed and direction, and adjusts the lifting speed of the engineering logging instrument and the multi-arm welding system;

[0048] When the engineering logging instrument 5 is inserted, the present invention uses three cameras to form a circular monitoring with equal angle distribution, and installs a fill light, an ultrasonic sensor and a temperature and humidity sensor at the position of each camera; a high-definition camera that can rotate 360 ​​degrees is used, and the three cameras all perform wide-angle shooting. At the same time, the three cameras are used to cooperate in shooting, and a blind-angle shooting can be formed when the insertion equipment is lifted and lowered, thereby increasing the shooting range. At the same time, the video data of the detection is continuously obtained during the lifting and lowering process, and the fill light is used to improve the brightness, ensure the clarity of the shooting, use an ultrasonic sensor to detect the distance of the damaged point, and use a temperature and humidity sensor to detect the temperature and humidity changes when the equipment is lifted and lowered, thereby laying the foundation for the subsequent precise control of the multi-arm welding system.

[0049] The present invention establishes a three-dimensional model of an oilfield casing damaged well, wherein the three-dimensional model includes the following data: the three-dimensional data of the oilfield casing damaged well and the temperature and humidity distribution of the oilfield casing damaged well; a three-dimensional model including the spatial three-dimensional data and the temperature and humidity data is established, and in case of subsequent damage, any point of the casing damage can be effectively and quickly located, and the temperature during welding repair can be adjusted according to the temperature and humidity conditions.

[0050] When treating the damaged casing wells in the oil field, the engineering logging instrument performs a secondary review on the monitoring data of the probe monitoring equipment, and then the multi-arm welding system sequentially performs welding on the damaged casing parts in the damaged casing wells in the oil field;

[0051] According to the review results of the engineering logging instrument, the corresponding three-dimensional model generated by the penetration equipment can ensure the accuracy of the welding position of the multi-arm welding system, and then the welding operations are carried out in sequence, which can effectively ensure the completion of the repair of the casing damage after welding.

[0052] When comparing the first 3D modeling and the second 3D modeling, and based on the comparison of the two modeling data, the completion of the welding repair at the casing damage can be more intuitively reflected. At the same time, it is convenient to determine whether the treatment method needs to be supplemented based on the completion of a single welding repair.

[0053] Example 3

[0054] On the basis of Example 1 and Example 2, in the oil and water well casing corrosion and leakage well section treatment device based on downhole welding of the present invention, the multi-arm welding system 6 includes a downhole welding system working equipment control box 602 fixed directly below the engineering logging instrument 5, and the top of the downhole welding system working equipment control box 602 is fixedly connected with at least three straightening telescopic structures 601 around the wellhead center, and the downhole welding system working equipment control box 602 is connected to the base structure 603, and the base structure 603 can drive the welding machine arm 604 to rotate, and the welding machine arm 604 is provided on the base structure 603, and the lower part of the welding machine arm 604 is provided with a welding gun 605;

[0055] The downhole welding system working equipment control box 602 serves as the control equipment of the multi-arm welding system 6. Before welding, the longitudinal position of the multi-arm welding system 6 in the wellbore is adjusted by lifting and lowering the wire rope 4. Combined with the adjustment of the straightening telescopic structure 601, the position and centering of the downhole welding system working equipment control box 602 are controlled. Then, the downhole welding system working equipment control box 602 controls the base structure 603 to perform a 360° rotation operation. When it rotates to a certain position, the controller controls and adjusts the welding machine arm 604 to move. The welding machine arm 604 controls the movement of the joints therein, thereby accurately controlling the welding gun 605 to the casing damage position A, so as to prepare for the next welding step.

[0056] Example 4

[0057] On the basis of Example 1 and Example 2, when the oil and water well casing corrosion and leakage well section treatment device based on downhole welding of the present invention is working, firstly, a fixed pulley is fixed just above the wellhead 3 to perform the steering work of the wire rope 4, and then the control cabinet 1 controls the winch 2 to rotate and releases the wire rope 4. At this time, the engineering logging instrument 5 and the multi-arm welding system 6 below the wire rope 4 are synchronously lowered, and the engineering logging instrument 5 reaches the casing damage position A to realize detection;

[0058] Then the multi-arm welding system 6 reaches the casing damage position A to implement welding repair. Specifically, before welding, the longitudinal position of the multi-arm welding system 6 in the wellbore is adjusted by lifting and lowering the wire rope 4. Combined with the adjustment of the straightening telescopic structure 601, the position and centering of the downhole welding system working equipment control box 602 are controlled. Then the downhole welding system working equipment control box 602 controls the rotation of the base structure 603 and the movement of the welding machine arm 604, so that the welding gun 605 reaches the casing damage position to complete the welding. In this way, the welding repair work at the casing damage of the oil field well can be completed.

Claims

1. A device for treating oil and water well casing corrosion and leakage based on downhole welding, characterized in that: The invention comprises a winch (2) fixedly installed on the ground beside a wellhead (3), the winch (2) being electrically connected to a control cabinet (1) via a wire, a fixed pulley (7) being fixedly installed just above the wellhead (3), the winch (2) being used for lifting and a steel wire rope (4) below which passes around the fixed pulley (7) and then turns and extends into the wellhead (3) and is fixedly connected to an engineering logging instrument (5), the engineering logging instrument (5) being in bidirectional signal communication with the control cabinet (1) via a wire, and a multi-arm welding system (6) being fixedly installed just below the engineering logging instrument (5), the multi-arm welding system (6) being in bidirectional signal communication with the control cabinet (1) via a wire.

2. The device for treating oil and water well casing corrosion and leakage based on downhole welding according to claim 1 is characterized in that: The multi-arm welding system (6) comprises a downhole welding system working equipment control box (602) fixed directly below the engineering logging instrument (5); the downhole welding system working equipment control box (602) and the control cabinet (1) are connected to each other by two-way signals via wires; at least three straightening and telescopic structures (601) are fixedly connected to the top of the downhole welding system working equipment control box (602) around the center of the wellhead; a rotatable base structure (603) is fixedly connected to the bottom of the downhole welding system working equipment control box (602); a welding machine arm (604) is fixed to the bottom of the base structure (603); a welding gun (605) is fixedly provided on one side of the bottom of the welding machine arm (604); the welding gun (605) is linked to the downhole welding system working equipment control box (602) by electrical signals via wires; and the welding machine arm (604) and the downhole welding system working equipment control box (602) are connected by electrical signals via wires.

3. The device for treating oil and water well casing corrosion and leakage based on downhole welding according to claim 2 is characterized in that: The straightening telescopic structure (601) comprises a straightening telescopic block (606) and an electric hydraulic cylinder (607). The electric hydraulic cylinder (607) is fixedly connected with at least three of them on the top of the downhole welding system working equipment control box (602) around the center of the wellhead. The straightening telescopic block (606) is fixed to the telescopic end of the telescopic piston rod of the electric hydraulic cylinder (607). The electric hydraulic cylinder is connected to the downhole welding system working equipment control box (602) through an electrical signal wire.

4. The device for treating oil and water well casing corrosion and leakage based on downhole welding according to claim 3 is characterized in that: The base structure (603) includes a drive motor (609), and the drive motor (609) is fixed to the bottom of the downhole welding system working equipment control box (602). The output end of the drive motor (609) is away from the downhole welding system working equipment control box (602) and is connected to a rotating shaft. A base (608) is fixed on the rotating shaft. The base (608) is fixedly connected to the welding machine arm (604). The drive motor (609) is connected to the downhole welding system working equipment control box (602) through a wire electrical signal.

5. The device for treating oil and water well casing corrosion and leakage based on downhole welding according to claim 4 is characterized in that: Three cameras (501) are evenly installed on the engineering logging instrument (5) around the inner wall of the well to form a ring monitoring system. Each of the cameras (501) is installed with a fill light (502), an ultrasonic sensor (503) and a temperature and humidity sensor (504). The cameras (501), fill light (502), ultrasonic sensor (503) and temperature and humidity sensor (504) are all connected to the control cabinet (1) via wires.

6. A method for treating the corrosion and leakage of oil and water well casing based on downhole welding, characterized in that: The device for treating the corrosion and leakage of casing in oil and water wells based on downhole welding as claimed in claim 5 is used, specifically: a control cabinet (1) is used to control the winch (2) to raise and lower the lifting wire rope (4), the downhole depth of the engineering logging instrument (5) is adjusted to detect the precise location and degree of the casing damage, and then the multi-arm welding system (6) is lowered according to the precise location of the casing damage to weld the damaged part.

7. The method for treating oil and water well casing corrosion and leakage based on downhole welding according to claim 6 is characterized in that: The specific steps are as follows: Step 1, preparation before construction: install the oil and water well casing corrosion and leakage treatment device based on downhole welding; Step 2, controlling the winch (2) to raise and lower the lifting wire rope (4) through the control cabinet (1), adjusting the downhole depth of the engineering logging instrument (5), using the engineering logging instrument (5) to detect the corrosion and leakage section of the oil and water well to determine the precise location and damage degree of the casing damage, and transmitting the above detection data back to the control cabinet (1) to establish a three-dimensional model of the casing damage well in the oil field; Step 3, according to the bottom position of the damaged well section detected in step 2, the control cabinet (1) controls the winch (2) to lower the wire rope (4) to lower the welding gun (605) to the bottom position of the damaged well section, and then the control cabinet (1) controls the electric hydraulic cylinder (607) to extend through the downhole welding system working equipment control box (602), so that the straightening telescopic block (606) extends against the inner wall of the well to realize the straightening and temporary fixation of the multi-arm welding system (6) in the well, and then the control cabinet (1) controls the driving motor to rotate through the downhole welding system working equipment control box (602), thereby driving the base (608) to rotate and driving the welding machine arm (604) to rotate, and aligning the welding gun (605) with the casing corrosion leakage position. After welding one position, the control cabinet (1) controls the straightening telescopic block (606) to be retracted, and then the wire rope (4) is lifted up, and each corroded position is welded and repaired from bottom to top in turn until the treatment of the entire corroded well section is completed; Step 4: After completing the welding repair of the corrosion and leakage positions in the entire wellbore, re-use the engineering logging instrument to detect the welded and repaired well section again, perform secondary three-dimensional modeling, and evaluate the welding repair effect of the corrosion and leakage well section by comparing the detection data before and after the treatment; Step 5: If the repair does not meet the requirements for continued use, repeat steps 3 and 4 until the repair meets the requirements. If the repair meets the requirements for continued use, use the power of the workover rig to lower the screw motor and milling cone to expand the welded repaired corrosion and leakage well section to ensure the wellbore diameter.

8. The method for treating oil and water well casing corrosion and leakage based on downhole welding according to claim 7 is characterized in that: In step 2, the engineering logging instrument (5) is used to detect the corrosion and leakage section of the oil and water well to determine the precise location and degree of casing damage, and the detection data is transmitted back to the control cabinet (1) to be imported into the modeling software. Specifically, when the engineering logging instrument (5) is lowered into the well, the fill light (502) and the camera (501) are turned on, and the camera (501), the ultrasonic sensor (503) and the temperature and humidity sensor (504) all transmit the collected information back to the control cabinet (1) in real time. Then, computer modeling is used to draw a three-dimensional spatial structure of the damage of the inner wall of the wellbore based on the image information transmitted back by the camera image (501) and the ultrasonic information transmitted back by the ultrasonic sensor (503), so as to construct a three-dimensional model of the casing damaged well in the oil field, and the three-dimensional model also includes the temperature and humidity arrangement of the casing damaged well in the oil field.

9. The method for treating oil and water well casing corrosion and leakage based on downhole welding according to claim 8, characterized in that: In step 3, when treating the damaged casing of an oil field well, the control cabinet (1) controls the lifting and lowering of the wire rope according to the three-dimensional model of the damaged casing well established for the first time, so that the multi-arm welding system (6) is aligned with the position of the casing corrosion and leakage, and then welding repair is performed from bottom to top in sequence.

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