Device and method for detecting torque value of oil casing hydraulic clamp

Abstract

The invention discloses a device and method for detecting the torque value of an oil casing hydraulic clamp, and relates to the field of natural gas production, and the key points of the technical scheme are as follows: when the torque value of the oil casing hydraulic clamp is detected, an oil casing is mounted on a test system; the simulation device is used for simulating the hanging load of the oil casing, the stress of a hydraulic clamp and the angle of the oil casing in the torque screwing-on process of the oil casing; the testing system comprises a first conversion connector, a torque sensor and a second conversion connector. The first adapter, the torque sensor and the second adapter are connected in sequence; and the data analysis system is connected with the torque sensor and is used for converting the electric signal generated by the torque sensor into a torque value and determining the torque error of the oil casing hydraulic clamp according to the torque value of the hydraulic clamp, the torque value detected by the torque sensor and the torque range of the hydraulic clamp.

Description

Technical Field

[0001] This application relates to the field of natural gas extraction, and more specifically, it relates to a device and method for detecting the torque value of hydraulic clamps for oil casing. Background Technology

[0002] Hydraulic casing clamps are currently the primary equipment for threading casing. The accuracy of their torque value is crucial to the quality of the threading, and strict torque requirements are specified for different specifications and steel grades of casing. Excessive threading torque may increase the likelihood of thread damage and sticking; insufficient torque can lead to slippage and leakage. Currently, the torque value of hydraulic casing clamps is primarily tested according to SY / T 6742—2008 "Calibration Method for Casing Clamp Torque Meters." The force sensor is removed and sent to a third-party calibration institution to ensure the accuracy of the torque value. If the sensor is sent for calibration, the torque value of the hydraulic casing clamp cannot be tested, rendering the clamp unusable and delaying on-site operations.

[0003] The torque value detection of hydraulic clamps for oil casing mainly relies on the force sensor and does not consider the influence of the entire torque transmission system on the output torque, such as the effects of hydraulic system leakage, sensor loosening, wear and loosening of mating surfaces between transmission components, and imbalance between the active clamp and the back clamp.

[0004] In summary, there are two problems with the current torque value detection of hydraulic clamps for oil casing: first, the force sensor needs to be disassembled and sent to a third-party testing institution, which takes a long time and reduces the testing efficiency; second, only the calibration of individual components can be performed, and the overall torque value cannot be tested, resulting in low detection accuracy. Summary of the Invention

[0005] This application provides a device and method for detecting the torque value of hydraulic clamps for oil casing, which solves the problem of insufficient detection efficiency and accuracy caused by the inability of existing detection methods to meet the needs of on-site detection of hydraulic clamps for oil casing.

[0006] In a first aspect, this application provides a hydraulic clamp torque value detection device for oil casing, the detection device including a testing system and a data analysis system;

[0007] When testing the torque value of the hydraulic clamp for oil casing, the oil casing is installed on the test system to simulate the suspended weight of the oil casing, the force on the hydraulic clamp, and the angle of the oil casing during the torque clamping process; wherein, the test system includes a first adapter, a torque sensor, and a second adapter; the first adapter, the torque sensor, and the second adapter are connected sequentially;

[0008] The data analysis system is connected to the torque sensor and is used to convert the electrical signal generated by the torque sensor into a torque value. Based on the torque value of the hydraulic clamp, the torque value detected by the torque sensor, and the torque range of the hydraulic clamp, the torque error of the oil casing hydraulic clamp is determined.

[0009] In one implementation, the test system further includes a gyroscope, which is fixedly mounted on the torque sensor.

[0010] In one implementation, the data analysis system is connected to a gyroscope to convert the electrical signals generated by the gyroscope into angle values.

[0011] In one implementation, the torque sensor is a static torque sensor.

[0012] In one implementation, the detection device further includes a power supply system and a data storage system;

[0013] The power supply system is connected to the data analysis system, the torque sensor and the data storage system respectively, and is used to provide electrical energy to the data analysis system, the torque sensor and the data storage system.

[0014] The data storage system is connected to the data analysis system and is used to store the data results output by the data analysis system.

[0015] In one implementation, the data analysis system includes a signal amplification unit, an analog-to-digital conversion unit, and a processor;

[0016] The signal amplification unit is used to amplify the electrical signals output by the torque sensor and the gyroscope;

[0017] The analog-to-digital conversion unit is used to convert the amplified electrical signal into torque and angle values, respectively.

[0018] The processor is used to determine the torque error of the hydraulic clamp for the casing.

[0019] In one implementation, the detection device further includes a display;

[0020] The display is connected to the data analysis system, and the torque value in the data analysis system is transmitted to the display for display.

[0021] A second aspect of this application provides a method for detecting the torque value of hydraulic clamps for oil casing, employing a torque value detection device for hydraulic clamps for oil casing as provided in the first aspect of this application, characterized in that the detection method includes:

[0022] In the vertical direction, the first conversion joint, torque sensor and second conversion joint are fixedly connected in order from top to bottom, and the lower oil casing is connected to the lower end of the second conversion joint;

[0023] Clamp the lower oil casing coupling with the spare clamp of the hydraulic casing clamp, and clamp the lower oil casing with the main clamp of the hydraulic casing clamp. Observe the angle value of the oil casing through the display. After confirming that the oil casing is horizontal, start the torque value detection during the upper clamping process of the hydraulic casing clamp. Obtain the torque value detected by the torque sensor during the upper clamping process of the hydraulic casing clamp. Calculate the torque error of the hydraulic casing clamp based on the torque value of the hydraulic clamp, the torque value detected by the torque sensor, and the torque range of the hydraulic clamp.

[0024] In one implementation, the torque value detection during the hydraulic clamping process of the casing is activated, specifically as follows:

[0025] Using the above-mentioned buckling position as the initial position, after completing one buckling process, rotate the oil casing at a predetermined angle. After confirming that the oil casing is horizontal, start the torque value detection of the oil casing hydraulic clamp buckling process until the oil casing rotates one full turn, completing the corresponding number of tests. The average value of the corresponding number of tests is taken as the torque value of the oil casing hydraulic clamp buckling process.

[0026] In one implementation, the formula for calculating the torque error of the hydraulic clamp for oil casing is: Where w represents the torque value of the hydraulic clamp, w represents the torque value detected by the torque sensor, and Wps represents the torque range of the hydraulic clamp.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] The oil casing hydraulic clamp torque value detection device provided in this application completes the torque value detection of the oil casing hydraulic clamp during clamping, enabling rapid on-site testing of the oil casing hydraulic clamp. This eliminates the need to disassemble the force sensor for testing, thus reducing the efficiency of the oil casing hydraulic clamp. Furthermore, since the torque value detection is carried out during the clamping process, it realistically simulates the torque generation process of the clamping process, realizing the overall testing of the torque value transmission system and solving the problem that the original method could only test a single point of the force sensor. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of the embodiments of this application and form part of this application, do not constitute a limitation on the embodiments of this application. In the drawings:

[0030] Figure 1 This is a schematic diagram of the hydraulic clamp torque value detection device for oil casing provided in the embodiments of this application;

[0031] Figure 2 A schematic diagram of the power supply system provided in the embodiments of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the data analysis system provided in the embodiments of this application.

[0033] The attached diagram shows the markings and corresponding component names:

[0034] 1. Torque sensor; 2. Gyroscope; 3. First adapter; 4. Second adapter; 5. Upper oil casing; 6. Lower oil casing; 7. Data acquisition system; 8. Data storage system; 9. Data analysis system; 10. Display; 11. Power supply system. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0036] It should be noted that the terms "comprising" or "may include" used in the various embodiments of this application indicate the presence of the claimed function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this application, the terms "comprising," "having," and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or adding one or more combinations of the foregoing.

[0037] In various embodiments of this application, the expression "or" or "at least one of B and / or C" includes any combination or all combinations of the words listed simultaneously. For example, the expression "B or C" or "at least one of B and / or C" may include B, may include C, or may include both B and C.

[0038] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] Furthermore, terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0040] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the hydraulic clamp torque value detection device for oil casing provided in the embodiments of this application, as shown below. Figure 1 As shown, the detection device includes a testing system and a data analysis system 99;

[0041] When testing the torque value of the hydraulic clamp for oil casing, the oil casing is installed on the test system to simulate the suspended weight of the oil casing, the force on the hydraulic clamp, and the angle of the oil casing during the torque clamping process. The test system includes a first adapter 3, a torque sensor 1, and a second adapter 4. The first adapter 3, the torque sensor 1, and the second adapter 4 are connected sequentially.

[0042] The data analysis system 9 is connected to the torque sensor 1 and is used to convert the electrical signal generated by the torque sensor 1 into a torque value. Based on the torque value of the hydraulic clamp, the torque value detected by the torque sensor 1, and the torque range of the hydraulic clamp, the torque error of the oil casing hydraulic clamp is determined.

[0043] Based on the composition of the testing device provided in this application embodiment, the working principle of the testing device provided in this embodiment will now be explained: When testing the torque value of the tubing hydraulic wrench, the torque sensor 1 is connected to the tubing via two conversion connectors. The upper end of the second conversion connector 4 is connected to the torque sensor 1, and the lower end is connected to the tubing. The lower end of the first conversion connector 3 is connected to the upper end of the torque sensor 1, and the upper end of the first conversion connector is connected to another tubing. After connection, it is placed in the middle of the tubing wrench. The spare wrench clamps the lower tubing coupling, and the main wrench clamps the tubing body. The position of the tubing is adjusted by the gyroscope 2 to ensure that the tubing is in a vertical state. Then, the main wrench is started to rotate to perform the upper clamping test operation. The test process is exactly the same as the actual clamping operation using the tubing wrench. The system can test whether different suspension weights affect the torque value. At the same time, the gyroscope 2 can ensure that the tubing is always in a vertical state during the upper clamping test of the tubing wrench. Finally, the overall performance of the tubing wrench is evaluated based on the measurement results.

[0044] Specifically, in some embodiments, the testing system further includes a gyroscope 2, which is fixedly mounted on the torque sensor 1. A data analysis system 9 is connected to the gyroscope 2 and is used to convert the electrical signals generated by the gyroscope 2 into angle values.

[0045] The detection device provided in this embodiment analyzes and compares the measured torque value of the hydraulic clamp during the clamping process of the casing hydraulic clamp with the torque value of the hydraulic clamp itself to determine the accuracy of the torque value of the casing hydraulic clamp.

[0046] Specifically, the method for detecting the torque value of a hydraulic clamp using a detection device consists of three steps:

[0047] Step 1, Test clamp preparation: Torque sensor 1 is connected to the first adapter 3 and the second adapter 4 respectively. The lower end of the second adapter 4 is connected to the upper end of the lower oil casing 6. The lower end of the lower oil casing 6 can connect multiple oil casings at one time, thereby simulating the oil casing suspension, the hydraulic clamp force on the oil casing, and the oil casing angle during the upper clamping process. The upper end of the first adapter 3 is connected to the lower end of the upper oil casing 5. The upper end of the upper oil casing 5 is suspended by a hanger.

[0048] Step 2, Upper Clamping Test: The hydraulic casing clamp holds the lower sleeve with the standby clamp and the main clamp holds the upper sleeve with the main clamp. Observe the casing angle through the display 10 to ensure the casing is level. Then, set the sampling frequency in the data acquisition system and start the upper clamping test with the hydraulic casing clamp. The upper clamping position is the starting position. After completing this upper clamping test, rotate the casing 30° clockwise. Repeat the above operation to start the second test, until the casing has rotated one full revolution. Complete 12 tests and take the average of the 12 tests as the result of this test.

[0049] Step 3, Data Result Analysis: The torque values ​​measured by the hydraulic clamp itself and the torque values ​​measured 12 times by the hydraulic clamp detection device are calculated using formula (1) to obtain the torque indication error of the hydraulic clamp.

[0050] The formula for calculating the torque error of the hydraulic clamp for oil casing is: Where w represents the torque value of the hydraulic clamp, w represents the torque value detected by the torque sensor, and Wps represents the torque range of the hydraulic clamp.

[0051] Furthermore, torque sensor 1 has an accuracy class of 0.1% and is used to test the torque value of the hydraulic clamps on the casing during the threading process. Static torque sensor 1 is selected as torque sensor 1.

[0052] The gyroscope 2 is fixedly mounted on the torque sensor 1 to monitor the angle of the oil casing during the test process. This ensures that the oil casing is level and not eccentric during the test, and avoids the main and backup hydraulic clamps becoming unbalanced due to angle deviation during the oil casing clamping process, which would affect the test of the oil casing torque value.

[0053] Since the first adapter 3 and the second adapter 4 correspond to the upper adapter and the lower adapter respectively, oil casings of different sizes and models can be connected through this adapter.

[0054] In some embodiments, the detection device further includes a power supply system 11 and a data storage system 8; the power supply system 11 is connected to the data analysis system 9, the torque sensor 1, and the data storage system 8 respectively, and is used to provide electrical energy to the data analysis system 9, the torque sensor 1, and the data storage system 8; the data storage system 8 is connected to the data analysis system 9 and is used to store the data results output by the data analysis system 9.

[0055] Specifically, such as Figure 2 As shown, the power supply system 11 adopts a dual-power supply structure, consisting of a switching power supply 13-1 and four low-dropout linear power supplies 13-2, 13-3, 13-4, and 13-5. The switching power supply 13-1 features high efficiency, high power, and a wide input range, while the linear power supplies (13-2, 13-3, 13-4, and 13-5) feature good stability, high integration, and high precision. Accurate torque measurement is required, making the high-precision power supply system 11 crucial for accurately acquiring torque values. The high-precision linear power supply 13-2 powers the torque sensor 1, the linear power supply 13-3 powers the signal conditioning module 13-7, the linear power supply 13-4 powers the analog-to-digital conversion module 13-8, and the linear power supply 13-5 powers the signal processing module 13-9. Since the linear power supplies have relatively low power, to ensure stable power supply for multiple systems, this application uses multiple independent linear power supplies to independently power multiple modules, ensuring system accuracy while providing sufficient power. Switching power supply 1 is mainly used to power digital circuits 13-6, including digital communication circuits and data reading circuits. A detailed system power distribution diagram is shown below. Figure 2 As shown. The data acquisition system 7 mainly consists of an instrumentation amplifier 9-1, a programmable gain amplifier (PGA) 9-2, a digital-to-analog converter 9-3, and a processor 9-4.

[0056] The data storage system 8 uses multiple FLASH chips connected in parallel to store data, which increases storage space. In this embodiment, the CPU 24 uses two independent SPI25 and SPI26 internally to control the external FLASH 27 and FLASH 28 respectively, simultaneously reading and writing data to the external FLASH space. This method doubles both the storage space and the data read speed. Through software coordination and control, maximum read / write space and speed are guaranteed.

[0057] In some embodiments, the data analysis system 9 includes a signal amplification unit, an analog-to-digital conversion unit, and a processor; the signal amplification unit is used to amplify the electrical signals output by the torque sensor 1 and the gyroscope 2; the analog-to-digital conversion unit is used to convert the amplified electrical signals into torque values ​​and angle values ​​respectively; the processor is used to determine the torque error of the hydraulic clamp for the casing.

[0058] Specifically, such as Figure 3 As shown, the data analysis system 9 mainly consists of a data acquisition system 7 and a processor. The data acquisition system 7 includes a signal amplification unit and an analog-to-digital converter (ADC). For the weak electrical signals output by the torque sensor 1 and gyroscope 2, a two-stage amplification method is used to convert the weak signals output by the sensors into signals that can be recognized by the ADC 9-3. The first stage amplification uses an instrumentation amplifier 9-1, and the second stage uses a programmable gain amplifier (PGA) 9-2. This two-stage amplification ensures sufficient gain for signal conditioning, and the programmable gain amplifier in the second stage allows the processor 9-4 to directly control the gain. This application utilizes a larger gain factor for the comfortable range of analog signals, especially when the torque value is small, to increase the recognition accuracy of weak signals. The ADC 9-3, for accurate torque measurement, uses a 24-bit ADC tailored to the characteristics of the torque sensor 11. Internally, it also combines a fourth-order low-pass analog filter with a user-programmable digital filter to ensure sufficient protection of the signal chain, preventing high-frequency noise and out-of-band signal tones from aliasing back to the target frequency band. It also provides excellent resistance matching across the entire operating temperature range, employs an analog-to-digital converter with extremely high accuracy and excellent AC performance, and minimizes additional noise and errors as much as possible.

[0059] In some embodiments, the detection device further includes a display 10; the display 10 is connected to the data analysis system 9, and the torque value in the data analysis system 9 is transmitted to the display 10 for display.

[0060] Specifically, the display 10 can intuitively monitor the angle value monitored by the gyroscope 2, so as to monitor the angle of the oil sleeve in real time during the hydraulic clamping test, ensuring that the oil sleeve is level and not eccentric during the test, and improving the accuracy of the torque test.

[0061] This application embodiment also provides a method for detecting the torque value of hydraulic clamps for oil casing, employing an oil casing hydraulic clamp torque value detection device described in the above embodiment. The detection method includes:

[0062] In the vertical direction, the first conversion joint 3, the torque sensor 1, and the second conversion joint 4 are fixedly connected in order from top to bottom, and the lower oil casing 6 is connected to the lower end of the second conversion joint 4.

[0063] Clamp the lower oil casing 6 coupling with the spare clamp of the hydraulic casing clamp, and clamp the lower oil casing 6 with the main clamp of the hydraulic casing clamp. Observe the angle value of the oil casing through the display 10. After confirming that the oil casing is horizontal, start the torque value detection during the upper clamping process of the hydraulic casing clamp. Obtain the torque value detected by the torque sensor 1 during the upper clamping process of the hydraulic casing clamp. Calculate the torque error of the hydraulic casing clamp based on the torque value of the hydraulic clamp, the torque value detected by the torque sensor 1, and the torque range of the hydraulic clamp.

[0064] In some embodiments, the torque value detection during the hydraulic clamping process of the casing is activated, specifically as follows:

[0065] Using the above-mentioned buckling position as the initial position, after completing one buckling process, rotate the oil casing at a predetermined angle. After confirming that the oil casing is horizontal, start the torque value detection of the oil casing hydraulic clamp buckling process until the oil casing rotates one full turn, completing the corresponding number of tests. The average value of the corresponding number of tests is taken as the torque value of the oil casing hydraulic clamp buckling process.

[0066] Specifically, the predetermined angle can be 30 degrees, meaning that the number of tests to complete one full rotation is 12. Therefore, the final torque value for the hydraulic clamping process of the casing is the average of the 12 test results. It is understood that the predetermined angle can also be other degrees, and this application does not impose specific limitations on it.

[0067] In one implementation, the formula for calculating the torque error of the hydraulic clamp for oil casing is: Where w represents the torque value of the hydraulic clamp, w represents the torque value detected by the torque sensor, and Wps represents the torque range of the hydraulic clamp.

[0068] In summary, based on the detection device and method described above, this application utilizes a hydraulic clamp torque value detection device to measure the clamping torque value in real time during the clamping process of the casing and tubing. The measured value is then compared with a standard value to determine the accuracy of the hydraulic clamp torque value. This method enables real-time detection of the casing and tubing clamping process, eliminating the need to disassemble the force sensor and send it to a third-party testing institution, thus improving detection efficiency. Furthermore, this invention conducts detection during the clamping process of the casing and tubing hydraulic clamp, providing a holistic assessment of the entire casing and tubing torque value system. This includes the influence of factors such as friction at the equipment contact surfaces, imbalance between the main and backup clamps, and instability in the hydraulic system, thereby improving the efficiency and accuracy of the casing and tubing hydraulic clamp torque value detection.

[0069] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A hydraulic clamp torque value detection device for oil casing, characterized in that, The testing device includes a testing system and a data analysis system; When testing the torque value of the hydraulic clamp for oil casing, the oil casing is installed on the test system to simulate the suspended weight of the oil casing, the force on the hydraulic clamp, and the angle of the oil casing during the torque clamping process; wherein, the test system includes a first adapter, a torque sensor, and a second adapter; the first adapter, the torque sensor, and the second adapter are connected sequentially; The data analysis system is connected to the torque sensor and is used to convert the electrical signal generated by the torque sensor into a torque value. Based on the torque value of the hydraulic clamp, the torque value detected by the torque sensor, and the torque range of the hydraulic clamp, the torque error of the oil casing hydraulic clamp is determined.

2. The hydraulic clamp torque value detection device for oil casing according to claim 1, characterized in that, The testing system also includes a gyroscope, which is fixedly mounted on the torque sensor.

3. The hydraulic clamp torque value detection device for oil casing according to claim 2, characterized in that, The data analysis system is connected to a gyroscope and is used to convert the electrical signals generated by the gyroscope into angle values.

4. The hydraulic clamp torque value detection device for oil casing according to claim 3, characterized in that, The torque sensor is a static torque sensor.

5. The hydraulic clamp torque value detection device for oil casing according to claim 4, characterized in that, The detection device also includes a power supply system and a data storage system; The power supply system is connected to the data analysis system, the torque sensor and the data storage system respectively, and is used to provide electrical energy to the data analysis system, the torque sensor and the data storage system. The data storage system is connected to the data analysis system and is used to store the data results output by the data analysis system.

6. The hydraulic clamp torque value detection device for oil casing according to claim 5, characterized in that, The data analysis system includes a signal amplification unit, an analog-to-digital conversion unit, and a processor; The signal amplification unit is used to amplify the electrical signals output by the torque sensor and the gyroscope; The analog-to-digital conversion unit is used to convert the amplified electrical signal into torque and angle values, respectively. The processor is used to determine the torque error of the hydraulic clamp for the casing.

7. The hydraulic clamp torque value detection device for oil casing according to claim 1, characterized in that, The detection device also includes a display; The display is connected to the data analysis system, and the torque value in the data analysis system is transmitted to the display for display.

8. A method for detecting the torque value of hydraulic clamps for oil casing, comprising using the torque value detection device for hydraulic clamps for oil casing as described in any one of claims 1 to 7, characterized in that, The detection methods include: In the vertical direction, the first conversion joint, torque sensor and second conversion joint are fixedly connected in order from top to bottom, and the lower oil casing is connected to the lower end of the second conversion joint; Clamp the lower oil casing coupling with the spare clamp of the hydraulic casing clamp, and clamp the lower oil casing with the main clamp of the hydraulic casing clamp. Observe the angle value of the oil casing through the display. After confirming that the oil casing is horizontal, start the torque value detection during the upper clamping process of the hydraulic casing clamp. Obtain the torque value detected by the torque sensor during the upper clamping process of the hydraulic casing clamp. Calculate the torque error of the hydraulic casing clamp based on the torque value of the hydraulic clamp, the torque value detected by the torque sensor, and the torque range of the hydraulic clamp.

9. The method for detecting the torque value of hydraulic clamps for oil casing according to claim 8, characterized in that, The torque value detection during the opening process of the hydraulic clamp for oil casing is as follows: Using the above-mentioned buckling position as the initial position, after completing one buckling process, rotate the oil casing at a predetermined angle. After confirming that the oil casing is horizontal, start the torque value detection of the oil casing hydraulic clamp buckling process until the oil casing rotates one full turn, completing the corresponding number of tests. The average value of the corresponding number of tests is taken as the torque value of the oil casing hydraulic clamp buckling process.

10. The method for detecting the torque value of hydraulic clamps for oil casing according to claim 8, characterized in that, The formula for calculating the torque error of the hydraulic clamp for oil casing is: Where w represents the torque value of the hydraulic clamp, w represents the torque value detected by the torque sensor, and Wps represents the torque range of the hydraulic clamp.

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