Rapid detection method for casing damage of immovable string of injection well based on efficient measurement and adjustment

Abstract

The invention relates to the technical field of underground casing monitoring, and discloses an injection well immovable string casing damage rapid detection device based on efficient testing and adjusting, the injection well immovable string casing damage rapid detection device comprises a testing vehicle, a top sheave and a casing, one side in the testing vehicle is provided with a ground control system, and the other side in the testing vehicle is provided with a double-roller winch; a cable is wound on the outer side of the double-roller winch, an electromagnetic flaw detection testing instrument is installed at one end of the cable, an oil pipe is arranged in the casing pipe in a sleeved mode, a plurality of packers are sequentially installed between the outer side of the oil pipe and the inner wall of the casing pipe from top to bottom, and a plurality of water distributors are sequentially distributed in the oil pipe from top to bottom. A water injection well efficient testing and adjusting technology and an electromagnetic flaw detection technology are combined, an electromagnetic flaw detection testing instrument is tripped in through a testing vehicle, cable power supply and communication are tested, a ground control system carries out signal acquisition and processing on the electromagnetic flaw detection instrument, and rapid detection of casing damage of a water injection well immovable string is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of downhole casing monitoring, and in particular to a method for quickly detecting casing damage of a stationary pipe string of an injection well based on efficient measurement and adjustment. Background Art

[0002] As the years of water injection development in oil fields increase, the phenomenon of casing damage in water injection wells is becoming more and more serious. Therefore, oil production plants need to conduct timely investigations on the casing conditions of water injection wells to prevent casing damage in advance, find out the causes of casing damage, and prevent the expansion of casing damage areas. At present, there are two main methods adopted by oil production plants. One is to use well condition investigation operations to find out the casing conditions, and investigate the downhole casing conditions by pulling out the water injection string and lowering the lead mold. The other is to pull out the injection string and use ultrasonic, downhole video and electromagnetic detection methods to perform non-destructive testing of the casing.

[0003] At present, the well condition investigation method has the problems of long investigation time, untimely investigation and influence on water injection rate; at the same time, the method of pulling out the injection pipe requires the use of a professional testing vehicle, which not only has the problems of long investigation time, untimely investigation and influence on water injection rate, but also has high cost and cannot be widely promoted and applied. For this reason, the present invention proposes a method for rapid detection of casing damage of the fixed pipe string of the injection well based on efficient measurement and adjustment. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method for quickly detecting casing damage of a fixed tubular column in an injection well based on efficient measurement and adjustment, which solves the problems of long investigation time, untimely investigation and impact on water injection rate in the prior art well condition investigation method.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a rapid detection device for casing damage of a fixed tubing string in an injection well based on efficient measurement and adjustment, comprising a test vehicle, a sky pulley and a casing, a ground control system is installed on one side of the test vehicle, a double-drum winch is installed on the other side of the test vehicle, a cable is wound around the outside of the double-drum winch, an electromagnetic flaw detection test instrument is installed on one end of the cable, an oil pipe is sleeved inside the casing, a plurality of packers are installed in sequence from top to bottom between the outside of the oil pipe and the inner wall of the casing, a plurality of water distributors are installed in sequence from top to bottom inside the oil pipe, a baffle ball is arranged on the inner side of the bottom of the oil pipe, a screen pipe is fixedly connected to the bottom end of the oil pipe, a guide cone is fixedly connected to the bottom end of the screen pipe, and the outer periphery of the cable is arranged on the outer periphery of the sky pulley.

[0006] Preferably, the electromagnetic flaw detection test instrument includes a main body, the main body is located inside the oil pipe, the top of the main body is fixedly connected to an upper stabilizer, the top of the upper stabilizer is fixedly connected to an upper joint, the upper joint is butt-jointed with the cable, the bottom of the main body is fixedly connected to a lower stabilizer, and the bottom of the lower stabilizer is fixedly connected to a lower joint.

[0007] Preferably, the main body and the cable are electrically connected, and one end of the cable away from the upper connector is electrically connected to the ground control system.

[0008] A rapid detection system for casing damage of a fixed string of an injection well based on efficient measurement and adjustment, comprising:

[0009] Electromagnetic flaw detector module, used to measure and record casing damage data of downhole pipes;

[0010] The ground display module is used to visualize the measured downhole casing damage data;

[0011] The signal transmission module is used to transmit the measured downhole tubular casing damage data to the ground display module in real time.

[0012] Preferably, the electromagnetic flaw detector module comprises:

[0013] The temperature probe unit is used to detect the change of the temperature field of the fluid in the well and determine the position of the fluid outlet;

[0014] Longitudinal long-axis probe A unit is used to detect longitudinal defects inside the pipeline and quality defects of pipeline welds;

[0015] Transverse probe B unit, used to detect defects on the inner surface of the pipeline;

[0016] Transverse probe BB unit is used to cooperate with transverse probe B unit to further detect the inner surface defects of the pipeline;

[0017] Longitudinal short-axis probe C unit is used to detect defects in the transverse section of the pipeline;

[0018] Depth code disc unit, used to measure downhole depth data;

[0019] The natural gamma probe unit is used to detect the natural gamma intensity around the wellbore for depth calibration.

[0020] Preferably, the ground display module comprises:

[0021] Display device unit, used to display real-time casing damage information from downhole;

[0022] An image processing unit, used for preprocessing the displayed image;

[0023] a data decoder unit for decoding received data and converting it into a displayable format;

[0024] A display control unit, used to manage and control the display of data;

[0025] The data recording and storage unit is used to record and store the received information.

[0026] Preferably, the signal transmission module includes:

[0027] A power management circuit unit is used to manage the power supply of electronic equipment to ensure that the equipment obtains stable power supply voltage and current during normal operation;

[0028] A data transmission circuit unit, used to realize data transmission within the electronic device or between the electronic device and an external device;

[0029] A signal conditioning circuit unit is used to process and optimize the analog signal from the electromagnetic flaw detector module to make it suitable for digital processing or transmission and ensure the signal quality;

[0030] A coupling transformer unit is used to couple the power signal to the single-core cable to provide the power voltage and current required by the electromagnetic flaw detector;

[0031] Filter unit, used to ensure the stability and purity of the power signal and remove noise and interference;

[0032] Single-core transmission cable unit, a carrier for transmitting electrical signal data.

[0033] A method for quickly detecting casing damage of a fixed pipe string in an injection well based on efficient measurement and adjustment comprises the following steps:

[0034] Step 1: Provide power and support to the double-drum winch through the test vehicle, so that the double-drum winch starts to release the cable continuously, and through the top pulley installed at the top of the wellhead, ensure that the electromagnetic flaw detection test instrument connected below the cable can be stably sent into the oil pipe when it is released, until the electromagnetic flaw detection test instrument passes through the packer, water distributor, baffle ball, screen pipe and guide cone in sequence to reach the predetermined depth at the bottom of the pipe string;

[0035] Step 2: At this time, the electromagnetic flaw detection test instrument is started, and the double-drum winch is started to slowly reel in the cable, so that the electromagnetic flaw detection test instrument is slowly pulled upward from the inside of the oil pipe through the action of the top pulley. At this time, the electromagnetic flaw detection test instrument is kept in a stable movement inside the oil pipe through the upper and lower centralizers, and the casing damage of the pipe string is detected through the probe installed on the main body;

[0036] Step 3: Through the various probes in the electromagnetic flaw detector module, the casing damage of the downhole tubular is detected and recorded. At the same time, with the help of the depth code disk unit, the depth of the electromagnetic flaw detector test instrument in the well can be easily understood. Then, the electromagnetic flaw detector module transmits the detected downhole data to the ground display module through the cooperation of the signal transmission module. At the same time, the test vehicle can also provide power for the operation of the electromagnetic flaw detector module through the signal transmission module. After that, the workers judge and evaluate the casing damage of the downhole tubular through the detection data displayed on the ground display module.

[0037] Preferably, the top pulley in step 1 is installed above the injection wellhead through a ceiling pulley bracket, and a quarter point of the outer ring of the top pulley is located directly above the oil pipe.

[0038] Preferably, the detection and recording of casing damage of the downhole tubular string in step 3 includes the following steps:

[0039] S1. As the main body is pulled upward along the inner wall of the oil pipe, the temperature probe unit will detect the temperature inside the downhole pipe string in real time to prevent the temperature from affecting the results of electromagnetic flaw detection. At the same time, the longitudinal long axis probe A unit sends electromagnetic waves into the pipe string and then receives the reflected signal to detect the longitudinal defects inside the pipe string.

[0040] S2. Secondly, the longitudinal short-axis probe C unit will also emit electromagnetic waves to detect defects in the transverse section of the pipe string, and cooperate with the transverse probe B unit and the transverse probe BB unit to achieve non-dead-angle defect detection on the inner wall surface of the pipe string;

[0041] S3. At the same time, a depth code disk unit located underground will transmit the depth of the main body underground to the ground display module in real time, and cooperate with the natural gamma probe unit to detect the natural gamma around the well body to verify the depth of the main body underground.

[0042] The invention provides a method for quickly detecting casing damage of a stationary pipe string of an injection well based on efficient measurement and adjustment.

[0043] It has the following beneficial effects:

[0044] 1. The present invention combines the efficient testing and adjustment technology of water injection wells with the electromagnetic flaw detection technology, utilizes the existing test vehicles, cables, double-drum winches, overhead pulleys and other equipment of the efficient testing and adjustment technology of water injection wells, lowers the electromagnetic flaw detection test instrument through the test vehicle, tests the power supply and communication of the cable, and the ground control system collects and processes the signals of the electromagnetic flaw detection instrument, thereby realizing the rapid detection of casing damage of the stationary pipe string of the water injection well.

[0045] 2. The present invention improves the cable power supply and communication technology of the electromagnetic flaw detector, realizes the integration of efficient measurement and adjustment technology and electromagnetic flaw detection, and satisfies the accuracy of single-core cable power supply and data transmission by adding corresponding circuits. According to the characteristics of power supply and transmission signal, the signal loading is realized by using coupling transformer and filter.

[0046] 3. The present invention saves the operating costs and tool costs of raising and lowering the production tubing string when checking the casing condition, and reduces the lying time of the well. This feature makes it convenient for the oil production plant to conduct a census of the wellbore structure of the water injection well as a test operation of the water injection well, with high work efficiency, and can timely judge the damage of the casing wellbore structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a front view of the present invention;

[0048] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0049] Figure 3 is a system architecture diagram of the present invention;

[0050] Figure 4 It is a schematic diagram of the structure of the electromagnetic flaw detector module of the present invention;

[0051] Figure 5 It is a schematic diagram of the structure of the ground display module of the present invention;

[0052] Figure 6 It is a structural schematic diagram of a signal transmission module of the present invention;

[0053] Figure 7 It is a schematic diagram of the downhole casing curve of the 730m-740m detection in the second embodiment of the present invention;

[0054] Figure 8 It is a schematic diagram of the downhole casing curve of 820m-830m detection in the second embodiment of the present invention;

[0055] Fig. 9 It is a schematic diagram of the downhole casing curve of 940m-950m detection in the second embodiment of the present invention;

[0056] Fig.10 It is a schematic diagram of the downhole casing curve for 1030m-1040m detection in the second embodiment of the present invention.

[0057] Among them, 1. test vehicle; 2. ground control system; 3. double-drum winch; 4. overhead pulley; 5. cable; 6. casing; 7. oil pipe; 8. electromagnetic flaw detection test instrument; 9. packer; 10. water distributor; 11. ball stopper; 12. screen pipe; 13. guide cone; 14. upper joint; 15. upper centralizer; 16. main body; 17. lower centralizer; 18. lower joint. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Embodiment 1:

[0060] Please refer to the attached Figure 1-Attached Figure 6The embodiment of the present invention provides a fast detection device for casing damage of a fixed pipe column in an injection well based on efficient measurement and adjustment, including a test vehicle 1, a sky pulley 4 and a casing 6. A ground control system 2 is installed on one side of the test vehicle 1. The ground control system 2 can control the operating parameters of the entire device and is connected to a corresponding display device. A double-drum winch 3 is installed on the other side of the test vehicle 1. A cable 5 is wound around the outer side of the double-drum winch 3. The cable 5 is retracted and released by the double-drum winch 3, so that it is convenient to extend it into the well for operation. An electromagnetic flaw detection test instrument 8 is installed at one end of the cable 5. Through the connection between the cable 5 and the electromagnetic flaw detection test instrument 8, the cable 5 can not only provide power support for the operation of the electromagnetic flaw detection test instrument 8, but also transmit the information detected by the electromagnetic flaw detection test instrument 8 to the ground control system 2 in the test vehicle 1 through an electrical signal. The principle of the electromagnetic flaw detection test instrument 8 is based on the law of electromagnetic induction. Direct current is passed through the transmitting coil to generate a stable magnetic field around the solenoid. This stable magnetic field generates an induced current in the oil pipe and casing. When the direct current is disconnected, the induced current generates an induced electromotive force in the receiving coil that decays with different time. When the thickness of the pipe string changes or there are defects, the induced electromotive force ε will change. Through analysis and calculation, the cracks and holes in the pipe string can be judged and the wall thickness of the pipe string can be obtained. The casing 6 is provided with an oil pipe 7. Under the structure of the double casing column, when the power supply current is disconnected (120ms), the corresponding induced electromotive force amplitude generated in the receiving coil decays exponentially. Analysis shows that the greater the thickness of the steel pipe, the slower the induced electromotive force decays; conversely, the faster the induced electromotive force decays. The time period when the induced electromotive force decays faster mainly comes from the changes in the inner pipe, and the time period when the decay is slow mainly comes from the changes in the inner and outer pipes. After the inner pipe is initially determined, the factor affecting the attenuation of the induced electromotive force is mainly the outer pipe. Therefore, by measuring during the attenuation process of the induced electromotive force, the influence of the inner and outer pipes on the measurement can be distinguished and the technical conditions of the oil pipe and casing can be judged. A plurality of packers 9 are sequentially installed between the outer side of the oil pipe 7 and the inner wall of the casing 6 from top to bottom. The packers 9 are used to separate different levels of the wellbore to form a closed space. This closed space can be used to isolate or block fluids of different levels, such as oil, gas, water, etc., and play a role in isolating and controlling pressure in downhole operations such as oil wells and gas wells. A plurality of water distributors 10 are sequentially installed from top to bottom inside the oil pipe 7. The water distributors 10 can control and isolate the fluid in the well. By adjusting and controlling the sealing performance of the water distributors 10, pressure-sealed isolation sections can be formed in different areas of the oil pipe 7 and the casing 6. This isolation can prevent cross-contamination of the fluid between the oil pipe 7 and the casing 6, and can also control the flow direction and pressure transmission of the fluid. It can also balance the pressure of the fluid in the well and improve the stability of the operation. A ball block 11 is arranged on the inner side of the bottom of the oil pipe 7. The ball block 11 is placed on the step below the inner wall of the oil pipe 7 so that the ball block 11 will not fall out of the oil pipe 7.When the ball stopper 11 is in an open state, the fluid can flow freely through it, allowing the fluid to rise from the bottom of the well to the wellhead or vice versa. When the ball stopper 11 is in a closed state, it blocks the passage of the fluid and effectively closes the pipeline. The bottom end of the oil pipe 7 is fixedly connected with a screen 12, which is used to filter the fluid through its fine pore size and separate the solid particles such as sand, gravel, mud and sand from the fluid. By filtering impurities in the fluid by the screen 12, the efficiency of the oil production or water injection process can be improved. Clean fluid is easier to be pumped, lifted or injected into the formation, thereby improving productivity or injection effect. The bottom end of the screen 12 is fixedly connected with a guide cone 13, which is used to ensure that the casing can smoothly enter the underground along the wellbore. It plays a guiding role, helping the casing to accurately position and avoid deviation from the desired direction. The outer periphery of the cable 5 is arranged on the outer periphery of the sky pulley 4, and the cable 5 is guided in the direction by the sky pulley 4 to ensure that the cable 5 and the electromagnetic flaw detection test instrument 8 can be accurately and smoothly lowered into the well.

[0061] The electromagnetic flaw detection test instrument 8 includes a main body 16, on which a variety of flaw detection probes are installed to facilitate downhole flaw detection operations. The main body 16 is located inside the oil pipe 7, and the upper centralizer 15 is fixedly connected to the top of the main body 16. The upper centralizer 15 can prevent the top of the electromagnetic flaw detection test instrument 8 from deviating from the center position inside the oil pipe 7, and also prevent the electromagnetic flaw detection test instrument 8 from colliding with the inner wall of the oil pipe 7. The upper joint 14 is fixedly connected to the top of the upper centralizer 15, and the upper joint 14 is docked with the cable 5. The upper joint 14 is docked with the interface at the end of the cable 5, and the cable 5 and the upper joint 14 are fixed, so that the cable 5 can be connected to the main body 16. The lower end of the main body 16 is fixedly connected to the lower centralizer 17, and the lower end of the lower centralizer 17 is fixedly connected to the lower joint 18. The bottom of the electromagnetic flaw detection test instrument 8 is straightened by the lower centralizer 17 to prevent the bottom of the electromagnetic flaw detection test instrument 8 from being offset.

[0062] The main body 16 is electrically connected to the cable 5, and one end of the cable 5 away from the upper connector 14 is electrically connected to the ground control system 2. The information detected by the main body 16 can be transmitted to the ground control system 2 through the cable 5, and a continuous power supply can also be provided for the operation of the electromagnetic flaw detection test instrument 8.

[0063] A rapid detection system for casing damage of a fixed string of an injection well based on efficient measurement and adjustment, comprising:

[0064] Electromagnetic flaw detector module, used to measure and record casing damage data of downhole pipes;

[0065] A ground display module is used to visualize the measured downhole pipe casing damage data. This module is integrated with the ground control system 2 and can visualize the information received by the ground control system 2.

[0066] The signal transmission module is used to transmit the measured downhole tubular casing damage data to the ground display module in real time.

[0067] The electromagnetic flaw detector module includes:

[0068] The temperature probe unit is used to detect the change of the temperature field of the fluid in the well and determine the position of the fluid outlet;

[0069] Longitudinal long-axis probe A unit is used to detect longitudinal defects inside the pipeline and quality defects of pipeline welds;

[0070] Transverse probe B unit, used to detect defects on the inner surface of the pipeline;

[0071] Transverse probe BB unit is used to cooperate with transverse probe B unit to further detect the inner surface defects of the pipeline;

[0072] Longitudinal short-axis probe C unit is used to detect defects in the transverse section of the pipeline;

[0073] Depth code disc unit, used to measure downhole depth data;

[0074] The natural gamma probe unit is used to detect the natural gamma intensity around the wellbore for depth calibration.

[0075] The ground display module includes:

[0076] Display device unit, used to display real-time casing damage information from downhole;

[0077] An image processing unit, used for preprocessing the displayed image;

[0078] a data decoder unit for decoding received data and converting it into a displayable format;

[0079] A display control unit, used to manage and control the display of data;

[0080] The data recording and storage unit is used to record and store the received information.

[0081] The signal transmission module includes:

[0082] A power management circuit unit is used to manage the power supply of electronic equipment to ensure that the equipment obtains stable power supply voltage and current during normal operation;

[0083] A data transmission circuit unit, used to realize data transmission within the electronic device or between the electronic device and an external device;

[0084] A signal conditioning circuit unit is used to process and optimize the analog signal from the electromagnetic flaw detector module to make it suitable for digital processing or transmission and ensure the signal quality;

[0085] A coupling transformer unit is used to couple the power signal to the single-core cable to provide the power voltage and current required by the electromagnetic flaw detector;

[0086] Filter unit, used to ensure the stability and purity of the power signal and remove noise and interference;

[0087] Single-core transmission cable unit, a carrier for transmitting electrical signal data.

[0088] A method for quickly detecting casing damage of a fixed pipe string in an injection well based on efficient measurement and adjustment comprises the following steps:

[0089] Step 1: Provide power and support to the double-drum winch 3 through the test vehicle 1, so that the double-drum winch 3 starts to release the cable 5 continuously, through the top pulley 4 installed on the upper part of the wellhead, the top pulley 4 is installed above the wellhead through the ceiling pulley bracket, and a quarter point of the outer ring of the top pulley 4 is located directly above the oil pipe 7. Ensure that the electromagnetic flaw detection test instrument 8 connected below it can be stably sent into the oil pipe 7 when the cable 5 is released, until the electromagnetic flaw detection test instrument 8 passes through the packer 9, the water distributor 10, the ball stopper 11, the screen pipe 12 and the guide cone 13 in sequence to reach the predetermined depth at the bottom of the pipe string;

[0090] Step 2: At this time, the electromagnetic flaw detection test instrument 8 is started, and at the same time, the double-drum winch 3 is started to slowly reel in the cable 5, so that the electromagnetic flaw detection test instrument 8 is slowly pulled upward from the inside of the oil pipe 7 through the action of the top pulley 4. At this time, the electromagnetic flaw detection test instrument 8 is kept in a stable movement inside the oil pipe 7 through the upper centralizer 15 and the lower centralizer 17, and the casing damage of the pipe string is detected through the probe installed on the main body 16;

[0091] Step 3: Through the various probes in the electromagnetic flaw detector module, the casing damage of the downhole pipe string is detected and recorded, and the depth code disk unit is used to conveniently understand the depth of the electromagnetic flaw detection test instrument 8 in the downhole. As the main body 16 is pulled upward along the inner wall of the oil pipe 7, the temperature probe unit will detect the temperature in the downhole pipe string in real time to prevent the temperature from affecting the results of the electromagnetic flaw detection. At the same time, the longitudinal long-axis probe A unit sends electromagnetic waves to the inside of the pipe string and then receives the reflected signal to detect the longitudinal defects inside the pipe string. Secondly, the longitudinal short-axis probe C unit will also emit electromagnetic waves to detect defects in the transverse section of the pipe string, and cooperate with the transverse probe B unit and the transverse probe BB unit to realize the flaw detection of defects on the inner wall surface of the pipe string without dead angles. At the same time, a depth code disk unit located in the downhole will transmit the depth of the main body 16 in the downhole to the ground display module in real time, and cooperate with the natural gamma probe unit to detect the natural gamma around the wellbore to verify the depth of the main body 16 in the downhole. Then, the electromagnetic flaw detector module transmits the detected downhole data to the ground display module through the cooperation of the signal transmission module. At the same time, the test vehicle 1 can also provide power for the operation of the electromagnetic flaw detector module through the signal transmission module. After that, the workers judge and evaluate the casing damage of the downhole pipe through the detection data displayed on the ground display module.

[0092] Implementation column 2:

[0093] Please refer to the attached Figure 7 -Attached Fig.10 The embodiment of the present invention provides the casing damage data of the pipe string measured by the device, system and method based on the first embodiment. Preparation work before going down the well: Install the upper and lower centralizers of the electromagnetic flaw detection test instrument 8 on the ground, and connect it with the single-core cable on the test vehicle 1 through the cable head, and connect the ground control system 2 with the test vehicle 1. Read the relevant data of the test instrument through the ground control system software to ensure that the test instrument works normally before going down the well.

[0094] The electromagnetic flaw detection test instrument 8 is lowered into the well through the overhead pulley 4. After the instrument is lowered to the bottom of the well, the lowering speed should be controlled at 2300 meters / hour. After being lowered to the required test layer, it is powered on, the instrument depth is read, and the instrument is pulled up for logging. The pulling-up speed is controlled at 2000 meters / hour. The ground control system 2 controls and displays the test data and curves.

[0095] The X10 well has been recorded through casing workovers and test curves. Figure 7 The casing at 735m-740m is deformed; Figure 8 The casing at 826m-827.6m is deformed; Fig. 9 It shows that 942.3m-951.8m is the reinforced pipe well section; Fig.10 The casing at 1034.0m-1035.2m is deformed; Fig.10 The casing at 1038.1m-1039.2m was deformed, which avoided the need to move the tubing string for well condition investigation and directly reported it for overhaul.

[0096] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for rapid detection of casing damage of a fixed pipe string in an injection well based on efficient testing and adjustment, comprising a test vehicle (1), a top pulley (4) and a casing (6), characterized in that: A ground control system (2) is installed on one side of the test vehicle (1), and a double-drum winch (3) is installed on the other side of the test vehicle (1). A cable (5) is wound around the outside of the double-drum winch (3), and an electromagnetic flaw detection test instrument (8) is installed at one end of the cable (5). An oil pipe (7) is sleeved inside the casing (6), and a plurality of packers (9) are installed in sequence from top to bottom between the outside of the oil pipe (7) and the inner wall of the casing (6). A plurality of water distributors (10) are installed in sequence from top to bottom inside the oil pipe (7), and a blocking ball (11) is arranged on the inner side of the bottom of the oil pipe (7). A screen pipe (12) is fixedly connected to the bottom end of the oil pipe (7), and a guide cone (13) is fixedly connected to the bottom end of the screen pipe (12), and the outer periphery of the cable (5) is arranged on the outer periphery of the sky pulley (4).

2. According to the device for rapid detection of casing damage of the fixed pipe string of an injection well based on efficient measurement and adjustment according to claim 1, it is characterized in that: The electromagnetic flaw detection test instrument (8) comprises a main body (16), the main body (16) is located inside the oil pipe (7), the top end of the main body (16) is fixedly connected to an upper centralizer (15), the top end of the upper centralizer (15) is fixedly connected to an upper joint (14), the upper joint (14) and the cable (5) are butt-jointed, the bottom end of the main body (16) is fixedly connected to a lower centralizer (17), and the bottom end of the lower centralizer (17) is fixedly connected to a lower joint (18).

3. A rapid detection device for casing damage of a fixed pipe string in an injection well based on efficient measurement and adjustment according to claim 1 or 2, characterized in that: The main body (16) and the cable (5) are electrically connected, and one end of the cable (5) away from the upper connector (14) is electrically connected to the ground control system (2).

4. A rapid detection system for casing damage of an injection well stationary string based on efficient measurement and adjustment, characterized in that: A device for rapid detection of casing damage of a fixed pipe string of an injection well based on efficient measurement and adjustment according to any one of claims 1 to 3, comprising: Electromagnetic flaw detector module, used to measure and record casing damage data of downhole pipes; The ground display module is used to visualize the measured downhole casing damage data; The signal transmission module is used to transmit the measured downhole tubular casing damage data to the ground display module in real time.

5. The rapid detection system for casing damage of the fixed pipe string of the injection well based on efficient measurement and adjustment according to claim 4 is characterized in that: The electromagnetic flaw detector module comprises: The temperature probe unit is used to detect the change of the temperature field of the fluid in the well and determine the position of the fluid outlet; Longitudinal long-axis probe A unit is used to detect longitudinal defects inside the pipeline and quality defects of pipeline welds; Transverse probe B unit, used to detect defects on the inner surface of the pipeline; Transverse probe BB unit is used to cooperate with transverse probe B unit to further detect the inner surface defects of the pipeline; Longitudinal short-axis probe C unit is used to detect defects in the transverse section of the pipeline; Depth code disc unit, used to measure downhole depth data; The natural gamma probe unit is used to detect the natural gamma intensity around the wellbore for depth calibration.

6. The rapid detection system for casing damage of the fixed pipe string of the injection well based on efficient measurement and adjustment according to claim 4 is characterized in that: The ground display module comprises: Display device unit, used to display real-time casing damage information from downhole; An image processing unit, used for preprocessing the displayed image; a data decoder unit for decoding received data and converting it into a displayable format; A display control unit, used to manage and control the display of data; The data recording and storage unit is used to record and store the received information.

7. The rapid detection system for casing damage of the fixed pipe string of an injection well based on efficient measurement and adjustment according to claim 4 is characterized in that: The signal transmission module comprises: A power management circuit unit is used to manage the power supply of electronic equipment to ensure that the equipment obtains stable power supply voltage and current during normal operation; A data transmission circuit unit, used to realize data transmission within the electronic device or between the electronic device and an external device; A signal conditioning circuit unit is used to process and optimize the analog signal from the electromagnetic flaw detector module to make it suitable for digital processing or transmission and ensure the signal quality; A coupling transformer unit is used to couple the power signal to the single-core cable to provide the power voltage and current required by the electromagnetic flaw detector; Filter unit, used to ensure the stability and purity of the power signal and remove noise and interference; Single-core transmission cable unit, a carrier for transmitting electrical signal data.

8. A method for rapid detection of casing damage of a fixed pipe string in an injection well based on efficient measurement and adjustment, characterized in that: A rapid detection device for casing damage of a fixed pipe string of an injection well based on efficient measurement and adjustment according to any one of claims 1 to 3 comprises the following steps: Step 1: The test vehicle (1) provides power and support to the double-drum winch (3), so that the double-drum winch (3) is started to continuously release the cable (5), and the top pulley (4) installed at the top of the wellhead is used to ensure that the cable (5) can stably and steadily send the electromagnetic flaw detection test instrument (8) connected below it into the oil pipe (7) when being released, until the electromagnetic flaw detection test instrument (8) passes through the packer (9), the water distributor (10), the baffle ball (11), the screen pipe (12) and the guide cone (13) in sequence to reach the predetermined depth at the bottom of the pipe string; Step 2: At this time, the electromagnetic flaw detection test instrument (8) is started, and at the same time, the double-drum winch (3) is started to slowly reel in the cable (5), so that the electromagnetic flaw detection test instrument (8) is slowly pulled upward from the inside of the oil pipe (7) through the action of the top pulley (4). At this time, the electromagnetic flaw detection test instrument (8) is kept in a stable movement inside the oil pipe (7) through the upper centralizer (15) and the lower centralizer (17), and the casing damage of the pipe column is detected through the probe installed on the main body (16); Step 3: Detect and record casing damage of downhole pipes through various probes in the electromagnetic flaw detector module. At the same time, cooperate with the depth code disk unit to conveniently understand the depth of the electromagnetic flaw detector test instrument (8) in the well. Then, the electromagnetic flaw detector module transmits the detected downhole data to the ground display module through the cooperation of the signal transmission module. At the same time, the test vehicle (1) can also provide power for the operation of the electromagnetic flaw detector module through the signal transmission module. Then, workers judge and evaluate the casing damage of downhole pipes through the detection data displayed on the ground display module.

9. A method for rapid detection of casing damage of a fixed pipe string in an injection well based on efficient measurement and adjustment according to claim 8, characterized in that: The top pulley (4) in step 1 is installed above the injection wellhead via a ceiling pulley bracket, and a quarter point of the outer ring of the top pulley (4) is located directly above the oil pipe (7).

10. A method for rapid detection of casing damage of a fixed pipe string in an injection well based on efficient measurement and adjustment according to claim 8, characterized in that: The detection and recording of casing damage of downhole tubular string in step 3 includes the following steps: S1. As the main body (16) is pulled and moves upward along the inner wall of the oil pipe (7), the temperature probe unit will detect the temperature inside the downhole pipe string in real time to prevent the temperature from affecting the result of electromagnetic flaw detection. At the same time, the longitudinal long axis probe unit A detects the longitudinal defects inside the pipe string by sending electromagnetic waves into the pipe string and then receiving the reflected signals; S2. Secondly, the longitudinal short-axis probe C unit will also emit electromagnetic waves to detect defects in the transverse section of the pipe string, and cooperate with the transverse probe B unit and the transverse probe BB unit to achieve non-dead-angle defect detection on the inner wall surface of the pipe string; S3. At the same time, a depth code disc unit located underground will transmit the depth of the main body (16) underground to the ground display module in real time, and cooperate with the natural gamma probe unit to detect the natural gamma around the well body to verify the depth of the main body (16) underground.

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