On-line testing method and device for rotating disc torque of under-pressure operation machine

Abstract

The invention provides an under-pressure operation machine turntable torque online test method and device, and relates to the field of petroleum equipment detection and evaluation, and the device comprises a tool module, a monitoring module, an acquisition module, a data transmission module, a control platform and an early warning module. The monitoring module, the acquisition module and the data transmission module are controlled by taking the control platform as a center, the monitoring module is used for monitoring torsion frequency signals of a mandrel under different output torques of a turntable, the acquisition module and the data transmission module are used for acquiring and sending the data, and an analysis result is analyzed and calculated through the control platform. And finally, early warning information is sent out through the early warning module, automatic real-time monitoring of the torque change condition of the rotary table can be achieved without disassembling and assembling the rotary table, and the real output torque of the rotary table of the under-pressure operation machine can be accurately measured in real time and early warned.

Description

Technical Field

[0001] The present invention relates to the field of inspection and evaluation of oil equipment, and particularly to an on-line torque testing method and device for the rotary table of a workover rig under pressure. Background Art

[0002] Workover under pressure in gas wells refers to the construction operation carried out in the wellbore by means of a workover rig under pressure at the wellhead of a gas well or an oil and gas well. The workover rig mainly includes a workover main unit and a wellhead blowout preventer group. The main unit is mainly used to overcome the gravity or upward force of the pipe string in the well, and the wellhead blowout preventer group and the plugging tool in the pipe string are used to control the well pressure, so as to realize the operation of pulling out and running in the pipe string or rotating operation under the condition of wellhead pressure. Therefore, during the workover under pressure, there is no need to kill the well, blow out, or relieve the pressure, which has the characteristics of "zero damage to the reservoir, zero environmental pollution, zero liquid discharge, and short operation cycle", is conducive to energy conservation and emission reduction, and stable production of single wells, and is widely used in well completion, workover, fracturing acidification, hidden danger treatment, etc. of oil and gas wells. It is an important operation technology in the international oil and gas field engineering technology service field, and also the need of oil and gas development, green environmental protection, and clean production.

[0003] The rotary table in the rotary system of the workover rig under pressure is a core component fixed on the workover rig and cooperating with the slip mechanism for rotary workover operations. The hydraulic rotary table can rotate the pipe string in the light pipe string or heavy pipe string mode. In the light pipe string mode, it provides the rotation ability for the downhole tools that need to be rotated; in the workover under pressure or heavy pipe string mode, drilling or milling operations can be carried out without using a power swivel. If the output torque of the hydraulic rotary table is not detected, and its output torque fails to reach the required torque of the design, the situation of sticking of the drill pipe may occur during the workover under pressure, seriously affecting the production progress and causing waste of time and economy. Therefore, it is particularly important to measure the true output torque of the rotary table.

[0004] For example, in the Chinese patent literature, in the invention patent with the publication number CN105089620A and the name of Monitoring System, Method and Device for Sticking of Drill Pipe, published on May 4, 2015, the finite element calculation method is used to calculate the friction and torque at each point on the drill string, and the predicted values of the hook load and the rotary table torque are calculated by superposition, and the rotary table torque and the hook load in the real-time comprehensive mud logging data are compared with the predicted values. If it exceeds a certain range of the predicted value, an alarm is issued. Although the above-mentioned prior art can calculate the predicted value of the rotary table torque, there is still a deviation from the true output torque of the rotary table torque. Summary of the Invention

[0005] To address the deficiencies of the above-mentioned existing technologies, the present invention provides a method and device for on-site online testing of the torque of the rotary table of a pressure-operated work machine. Without disassembling and assembling the rotary table, it can measure the true output torque value of the rotary table of the pressure-operated work machine in real time and accurately, and perform data analysis and processing. During the operation of the equipment, abnormal situations can be immediately detected, avoiding equipment failures and production accidents. This helps to improve the working efficiency and safety of the pressure-operated work machine, reduce losses in production, and lower production risks.

[0006] It can then achieve automatic real-time monitoring and early warning of the changes in the torque of the rotary table.

[0007] The present invention is realized through the following technical solutions:

[0008] The first aspect of the object of the present invention is to provide an on-site online testing device for the torque of the rotary table of a pressure-operated work machine, including a tooling module, a monitoring module, a collection module, a data transmission module, and a control platform;

[0009] The tooling module includes an upper mandrel, a lower mandrel, and clamping tiles. The upper mandrel and the lower mandrel are connected together through the monitoring module, and the rotary table of the pressure-operated work machine is fixed on the upper mandrel through the clamping tiles;

[0010] The monitoring module is used to monitor the voltage signals when the mandrels in the tooling module are twisted under different output torques of the rotary table of the pressure-operated work machine;

[0011] The collection module is used to collect the voltage signals monitored by the monitoring module and convert the collected voltage signals into frequency signals;

[0012] The data transmission module is used to wirelessly transmit the data collected by the collection module to the control platform;

[0013] The control platform analyzes the received real-time torque of the rotary table of the pressure-operated work machine, mechanical transmission efficiency, power, and rotational speed and outputs the data analysis results.

[0014] Further, the monitoring module includes a torque sensor and a connecting wire; the connecting wire is arranged on the torque sensor; the torque sensor uses a millivolt-level voltage signal output torque sensor; signal amplification circuits are arranged at both ends of the connecting wire.

[0015] Further, the collection module includes a data collection unit, and the data collection unit is respectively connected to the monitoring module and the data transmission module.

[0016] Further, the control platform includes a monitoring and control unit, a data input unit, and a data analysis unit; the monitoring and control unit is connected to the data transmission module; the data input unit is connected to the data transmission module; the data analysis unit is connected to the data input unit.

[0017] Further, it further includes an early warning module. The early warning module includes an alarm unit. After the alarm unit receives the analysis result of the control center, if it exceeds the set turntable torque bearing threshold, it will alarm for overloading of the turntable torque; if it is lower than the set lower limit warning threshold, it will alarm for too low turntable torque.

[0018] Further, the upper mandrel and the lower mandrel are provided with a spline connection structure at the end far from the chuck segment, and an axial threaded hole is provided at the spline connection structure for connecting an involute spline and connecting a torque sensor through the involute spline; the upper mandrel and the lower mandrel are solid shafts with a cylindrical structure; the upper end of the upper mandrel and the lower end of the lower mandrel are both provided with a square structure, and a square cavity formed by four chuck segments is respectively sleeved on the upper end of the upper mandrel and the lower end of the lower mandrel.

[0019] Further, a groove is provided at the end of the upper mandrel far from the chuck segment. By screwing a bolt into the threaded hole on the torque sensor and inserting it into the groove, axial positioning between the mandrel and the torque sensor can be formed; the lower mandrel and the upper mandrel have the same symmetrical structure.

[0020] The second invention of the purpose of the present invention is to provide a method for on-site online testing of the turntable torque of a workover rig under pressure, which is characterized by including the following steps:

[0021] S1. Evaluate whether the tooling module meets the test requirements, including evaluating whether the diameter of the current test mandrel for the maximum torque test meets the minimum diameter requirement, and evaluating whether the spline at the mandrel connection part meets the limit values of bending fatigue and contact fatigue;

[0022] S2. If the test requirements are met in step S1, the above-mentioned on-site online testing device for the turntable torque of the workover rig under pressure will monitor the output torque of the turntable in real time. If the test requirements are not met, on-site testing cannot be carried out;

[0023] S3. The acquisition module and the data transmission module complete the acquisition and transmission of the above data, namely the real-time turntable torque, mechanical transmission efficiency, power, and rotational speed of the workover rig under pressure. After analysis by the control platform and output of the data analysis result, an early warning message is finally sent through the early warning module.

[0024] Further, in step S1, the specific steps for whether the diameter of the test mandrel for the maximum torque test meets the minimum diameter requirement are as follows:

[0025] S1.1 Determine the force on the mandrel according to the stress state and the magnitude of the force. Let the diameter of the mandrel be d, the length be L, and the torque be T. Then the maximum torsional stress of the mandrel is:

[0026] T max = T / (π * d 3 / 16)

[0027] According to the material mechanics properties of the mandrel, the maximum torsional stress τ of the material can be calculated allow , if τ max ≤τ allow , and the minimum diameter of the mandrel is d0, then the size of the mandrel meets the requirements; otherwise, it needs to be redesigned. The diameter of the mandrel meets the following requirements

[0028]

[0029] If the diameters d of the current tested upper mandrel and lower mandrel are ≥ d0, it is determined that the diameters of the current tested upper mandrel and lower mandrel meet the requirements;

[0030] S1.2. For the strength of the mandrel and spline, bending fatigue is adopted to ensure the bending strength of the spline, and contact fatigue is adopted to ensure the contact fatigue life of the spline teeth;

[0031] S1.2.1. Bending fatigue check, the calculation method is as follows:

[0032]

[0033] Among them, N is the bending life, K f is the fatigue strength coefficient, S f is the stress correction coefficient, K b is the size correction coefficient, K t is the temperature correction coefficient, K r is the reliability correction coefficient, K x 、K y 、K a are the load correction coefficients, σ a is the equivalent stress amplitude, δ is the diameter of the spline. If the bending life N of the spline is ≥ N0, where N0 represents the life of the spline using bending fatigue, i.e., the frequency, then the bending fatigue life of the spline meets the requirements;

[0034] S1.2.2. Contact fatigue check, the calculation method is as follows:

[0035] Calculate the contact stress of the spline, Among them, σ c is the contact stress, T is the torque, b is the number of teeth across, m is the module, n is the number of teeth, v is the Poisson's ratio, E is the elastic modulus, substitute the data to calculate: Calculate the contact fatigue strength of the spline, and use the following formula to calculate,

[0036]

[0037] Among them, σ -1 is the fatigue limit, σ k is the strength limit of the material, k f0is the fatigue strength coefficient, b is the number of teeth across, d is the base circle diameter of the spline, F is the load, and k w is the stress concentration coefficient, L is the effective length, r is the base circle radius, and c, d, and e are empirical coefficients;

[0038] If σ -1 > σ c , then the spline at the core shaft connection part meets the strength check requirements.

[0039] Further, the specific steps of the control platform analysis in the S3 step are as follows:

[0040] Let the real-time torque of the rotary table of the pressure-operated workover rig during data acquisition be T, the mechanical transmission efficiency be k, P be the power, n be the rotational speed, and the calculated torque of the rotary table of the pressure-operated workover rig be T0. Then the torque test method is as follows:

[0041]

[0042] When n = n i , and β ≥ ε, then the torque of the pressure-operated workover rig meets the functional use requirements;

[0043]

[0044] When n = n i , and β < ε, then the torque of the pressure-operated workover rig does not meet the functional use requirements;

[0045]

[0046] The beneficial effects of the present invention are as follows:

[0047] 1. A method and device for on-site online testing of the rotary table torque of a pressure-operated workover rig provided by the present invention can measure the true output torque value of the rotary table of the pressure-operated workover rig in real time and accurately.

[0048] 2. A method and device for on-site online testing of the rotary table torque of a pressure-operated workover rig provided by the present invention can monitor the change of the rotary table torque in real time, provide timely and reliable data, and effectively improve the test efficiency and accuracy.

[0049] 3. A method and device for on-site online testing of the rotary table torque of a pressure-operated workover rig provided by the present invention do not require the equipment to be shut down or disassembled, greatly saving time and maintenance costs. By real-time monitoring the rotary table torque value and performing data analysis and processing, abnormal situations can be immediately detected during the operation of the equipment, avoiding equipment failures and production accidents.

[0050] 4. A method and device for on-site online testing of the rotary table torque of a pressure-operated workover rig provided by the present invention helps to improve the working efficiency and safety of the pressure-operated workover rig, reduce losses in production, and lower production risks. Brief Description of the Drawings

[0051] Figure 1 It is a schematic structural diagram of an on-line torque monitoring device for the rotary table of a pressure operation machine provided by an embodiment of the present invention;

[0052] Figure 2 It is a schematic assembly diagram of the rotary table and the tooling module of a pressure operation machine provided by an embodiment of the present invention;

[0053] Figure 3 It is a schematic connection diagram of the tooling module and the monitoring module of an on-line torque monitoring device for the rotary table of an operation machine provided by an embodiment of the present invention;

[0054] Figure 4 It is a schematic diagram of the mandrel of the tooling module of an on-line torque monitoring device for the rotary table of an operation machine provided by an embodiment of the present invention;

[0055] Figure 5 It is a schematic diagram of the spline connection structure provided by an embodiment of the present invention;

[0056] Figure 6 It is a schematic diagram of the square structure of the present invention;

[0057] Figure 7 It is a schematic working diagram of an on-line torque monitoring device for the rotary table of an operation machine provided by an embodiment of the present invention; Reference numerals: 1 - clamping tile; 2 - upper mandrel; 3 - lower mandrel; 4 - torque sensor; 5 - connecting wire; 6 - signal amplification circuit; 7 - square structure; 8 - cylindrical structure; 9 - spline connection structure, 10 - rotary table of the pressure operation machine. Detailed Embodiment

[0058] Embodiment 1

[0059] Referring to the attached drawings of the specification Figure 1 and the attached drawings of the specification Figure 2 and the attached drawings of the specification Figure 7 As shown, the first aspect of the object of the present invention is to provide an on-site on-line test device for the torque of the rotary table of a pressure operation machine, including a tooling module, a monitoring module, a collection module, a data transmission module, and a control platform;

[0060] The tooling module includes an upper mandrel 2, a lower mandrel 3 and a clamping tile 1. The upper mandrel 2 and the lower mandrel 3 are connected together through the monitoring module, and the rotary table of the pressure operation machine is fixed on the upper mandrel through the clamping tile 1;

[0061] The monitoring module is used to monitor the voltage signal when the mandrel in the tooling module is twisted under different output torques of the rotary table 10 of the pressure operation machine;

[0062] The collection module is used to collect the voltage signal monitored by the monitoring module and convert the collected voltage signal into a frequency signal;

[0063] The data transmission module is used to wirelessly transmit the data collected by the acquisition module to the control platform;

[0064] The control platform analyzes the received torque of the rotary table 10 of the pressure - operated work machine in real - time, mechanical transmission efficiency, power, and rotational speed, and outputs the data analysis result.

[0065] In this embodiment, the control platform also displays and saves the analysis result. The data transmission adopts transmission methods such as LORA wireless transmission technology, wireless local area network transmission, RS485 wireless transmission, or 4G signal transmission, and can adopt wired transmission or wireless transmission, making the system have strong applicability.

[0066] Embodiment 2

[0067] This embodiment further elaborates and supplements the implementation manner of the present invention on the basis of Embodiment 1.

[0068] Refer to the attached Figure 3 As shown in the figure, the monitoring module includes a torque sensor 4 and a connecting wire 5; the connecting wire 5 is arranged on the torque sensor 4. The external material of the connecting wire 5 adopts PVC (polyvinyl chloride) material or PE (polyethylene) material, which can protect the conductor inside the signal wire to a certain extent from interference, making the monitoring result more accurate; the torque sensor 4 adopts a millivolt - level voltage signal output torque sensor 4, which has a high measurement accuracy, making the monitoring result more accurate; signal amplification circuits 6 are arranged at both ends of the connecting wire 5 to meet the requirement of reducing attenuation during long - distance signal transmission and can effectively shield interference signals.

[0069] The acquisition module includes a data acquisition unit, and the data acquisition unit is respectively connected to the monitoring module and the data transmission module.

[0070] Embodiment 3

[0071] This embodiment further elaborates and supplements the implementation manner of the present invention on the basis of Embodiment 1 or Embodiment 2.

[0072] As an implementation manner of this embodiment, the control platform includes a monitoring and control unit, a data input unit, and a data analysis unit; the monitoring and control unit is connected to the data transmission module, and sends a control signal through the data transmission module to control the monitoring module to monitor the torque of the rotary table 10 of the pressure - operated work machine; the data input unit is connected to the data transmission module, and sends a signal through the data transmission module to control the acquisition module to collect the voltage signal of the monitoring module and convert it into a frequency signal for transmission; the data analysis unit is connected to the data input unit, and is used to analyze the data received by the data transmission module and output the analysis result.

[0073] As another implementation manner of this embodiment, it further includes an early warning module. The early warning module includes an alarm unit. After the alarm unit receives the analysis result from the control center, if the set turntable torque bearing threshold is exceeded, it will give an alarm for overloading of the turntable torque; if it is lower than the set lower limit warning threshold, it will give an alarm for too low turntable torque.

[0074] Embodiment 4

[0075] This embodiment further elaborates and supplements the implementation manner of the present invention on the basis of Embodiment 1, Embodiment 2 or Embodiment 3.

[0076] Refer to the attached Figures 3-6 As shown in the figure, as an implementation manner of this embodiment, the upper mandrel 2 and the lower mandrel 3 are provided with a spline connection structure 9 at the end far from the chuck segment 1, and an axial threaded hole is provided at the spline connection structure 9 for connecting an involute spline and connecting a torque sensor 4 through the involute spline, which can take into account the axial positioning and torque transmission between the mandrel and the torque sensor 4; the upper mandrel 2 and the lower mandrel 3 are solid shafts with a cylindrical structure 8, and the material is 40CrNiMo; the upper end of the upper mandrel 2 and the lower end of the lower mandrel 3 are both provided with a square structure 7, and the square cavity formed by four chuck segments 1 is respectively sleeved on the upper end of the upper mandrel 2 and the lower end of the lower mandrel 3, and the contact between the shaft and the chuck is used to transmit torque and load, which can effectively avoid loosening and fracture.

[0077] As another implementation manner of this embodiment, a groove is provided at the end of the upper mandrel 2 far from the chuck segment 1, and an axial positioning between the mandrel and the torque sensor 4 can be formed by screwing a bolt into the threaded hole on the torque sensor 4 and inserting it into the groove; the lower mandrel 3 and the upper mandrel 2 have the same symmetrical structure.

[0078] Embodiment 5

[0079] The second aspect of the object of the present invention is to provide a method for on-site online testing of the turntable torque of a workover rig under pressure, which is characterized by including the following steps:

[0080] S1. Evaluate whether the tooling module meets the test requirements, including evaluating whether the diameter of the current test mandrel for the maximum torque test meets the minimum diameter requirement, and evaluating whether the spline at the mandrel connection part meets the limit values of bending fatigue and contact fatigue;

[0081] S2. If the test requirements are met in step S1, the above-mentioned on-site online testing device for the turntable torque of the workover rig under pressure will monitor the output torque of the turntable in real time. If the test requirements are not met, on-site testing cannot be carried out;

[0082] S3. The acquisition module and the data transmission module complete the acquisition and transmission of the above data, including the rotary table torque, mechanical transmission efficiency, power, and rotational speed of the live pressure operation machine. The data is analyzed by the control platform and the analysis results are output. Finally, a warning message is sent through the warning module.

[0083] Further, in the S1 step, the specific steps for testing whether the diameter of the maximum torque test of the test mandrel meets the minimum diameter requirement are as follows:

[0084] S1.1 Determine the force on the mandrel according to the stress state and the magnitude of the force. Let the diameter of the mandrel be d, the length be L, and the torque be T. Then the maximum torsional stress of the mandrel is:

[0085] τ max = T / (π * d 3 / 16),

[0086] According to the mechanical properties of the mandrel material, the maximum torsional stress τ of the material can be calculated. allow , if τ max ≤ τ allow , and the minimum diameter of the shaft is d0, then the size of the mandrel meets the requirements; otherwise, it needs to be redesigned. The diameter of the mandrel meets the following requirements.

[0087]

[0088] If the diameters d of the current test upper mandrel 2 and lower mandrel 3 are ≥ d0, it is determined that the diameters of the currently tested upper mandrel 2 and lower mandrel 3 meet the requirements;

[0089] S1.2. For the strength of the mandrel and the spline, bending fatigue is used to ensure the bending strength of the spline, and contact fatigue is used to ensure the contact fatigue life of the spline teeth;

[0090] S1.2.1 Bending fatigue check, the calculation method is as follows:

[0091]

[0092] Among them, N is the bending life, K f is the fatigue strength coefficient, S f is the stress correction coefficient, K b is the size correction coefficient, K t is the temperature correction coefficient, K r is the reliability correction coefficient, K x , K y , K a is the load correction coefficient, σ a is the equivalent stress amplitude, and δ is the diameter of the spline. If the bending life N of the spline ≥ N0, where N0 represents the bending fatigue life of the spline, i.e., the frequency, then the bending fatigue life of the spline meets the requirements;

[0093] S1.2.2. Contact fatigue check, the calculation method is as follows:

[0094] Calculate the contact stress of the spline, where, σ c is the contact stress, T is the torque, b is the number of engaged teeth, m is the module, n is the number of teeth, v is the Poisson's ratio, E is the elastic modulus. Substitute the data and calculate to get: Calculate the contact fatigue strength of the spline, and use the following formula for calculation,

[0095]

[0096] where, σ -1 is the fatigue limit, σ k is the strength limit of the material, k f0 is the fatigue strength coefficient, b is the number of engaged teeth, d is the base circle diameter of the spline, F is the load, k w is the stress concentration coefficient, L is the effective length, r is the base circle radius, c, d, e are empirical coefficients;

[0097] If σ -1 > σ c , then the spline at the core shaft connection part meets the strength check requirements.

[0098] Furthermore, the specific steps of the control platform analysis in step S3 are as follows:

[0099] Let the real-time torque of the rotary table of the pressure - operated workover rig during data acquisition be T, the mechanical transmission efficiency be k, P be the power, n be the rotational speed, and the calculated torque of the rotary table of the pressure - operated workover rig be T0. Then the torque test method is as follows,

[0100]

[0101] When n = n i , and β ≥ ε, then the torque of the pressure - operated workover rig meets the functional use requirements;

[0102]

[0103] When n = n i , and β < ε, then the torque of the pressure - operated workover rig does not meet the functional use requirements;

[0104]

Claims

1. An on-site online torque testing device for the rotary table of a pressure operation machine, characterized in that, It includes a tooling module, a monitoring module, a collection module, a data transmission module, and a control platform; The tooling module includes an upper mandrel (2), a lower mandrel (3), and a chuck tile (1). The upper mandrel (2) and the lower mandrel (3) are connected together through the monitoring module, and the rotary table of the pressure - operated work machine is fixed on the upper mandrel by the chuck tile (1); The monitoring module is used to monitor the voltage signal when the mandrels in the tooling module are twisted under different output torques of the rotary table (10) of the pressure - operated work machine; The collection module is used to collect the voltage signal monitored by the monitoring module and convert the collected voltage signal into a frequency signal; The data transmission module is used to wirelessly transmit the data collected by the collection module to the control platform; The control platform analyzes the received real - time torque of the rotary table of the pressure - operated work machine, mechanical transmission efficiency, power, and rotational speed and outputs the data analysis result.

2. The on-site online torque testing device for the rotary table of a pressure operation machine according to claim 1, wherein, The monitoring module includes a torque sensor (4) and a connecting wire (5); the connecting wire (5) is arranged on the torque sensor (4); the torque sensor (4) is a torque sensor that outputs a millivolt - level voltage signal; signal amplification circuits (6) are arranged at both ends of the connecting wire (5).

3. The on-site online torque testing device for the rotary table of a pressure-operated work machine according to claim 1, wherein The collection module includes a data collection unit, and the data collection unit is respectively connected to the monitoring module and the data transmission module.

4. An on-site online torque testing device for the rotary table of a pressure operation machine according to claim 3, characterized in that, The control platform includes a monitoring and control unit, a data input unit, and a data analysis unit; the monitoring and control unit is connected to the data transmission module; the data input unit is connected to the data transmission module; the data analysis unit is connected to the data input unit.

5. The on-site online torque testing device for the rotary table of a pressure operation machine according to claim 1, characterized in that, It further includes an early warning module. The early warning module includes an alarm unit. After the alarm unit receives the analysis result of the control center, if it exceeds the set rotary table torque bearing threshold, it gives an alarm for over - load of the rotary table torque; If it is lower than the set lower limit warning threshold, it gives an alarm for too low rotary table torque.

6. The on-site online torque testing device for the rotary table of a pressure-operated work machine according to claim 2, wherein, The upper mandrel (2) and the lower mandrel (3) are provided with a spline connection structure (9) at the end far from the chuck tile (1), and an axial threaded hole is provided at the spline connection structure (9) for connecting an involute spline, and the involute spline is used to connect the torque sensor (4); the upper mandrel (2) and the lower mandrel (3) are solid shafts with a cylindrical structure (8); the upper end of the upper mandrel (2) and the lower end of the lower mandrel (3) are both set as a square structure (7), and a square cavity formed by four chuck tiles (1) is respectively sleeved on the upper end of the upper mandrel (2) and the lower end of the lower mandrel (3).

7. An on-site online torque testing device for the rotary table of a pressure operation machine according to claim 6, characterized in that, A groove is provided at the end of the upper mandrel (2) far from the chuck tile (1). By screwing a bolt into the threaded hole on the torque sensor (4) and inserting it into the groove, axial positioning between the mandrel and the torque sensor (4) can be formed; the lower mandrel (3) has the same symmetric structure as the upper mandrel (2).

8. An on-site online testing method for the torque of the rotary table of a pressure operation machine, characterized in that, It includes the following steps: S1. Evaluate whether the tooling module meets the test requirements, including evaluating whether the diameter of the maximum torque test of the current test mandrel meets the minimum diameter requirement, and evaluating whether the splines at the mandrel connection part meet the limit values of bending fatigue and contact fatigue; If the steps S2 and S1 meet the test requirements, the above on-site online test device for the rotary table torque of the pressure operation machine will monitor the output torque of the rotary table in real time. If the test requirements are not met, on-site testing cannot be carried out; S3. The acquisition module and the data transmission module complete the acquisition and transmission of the above data, namely the real-time rotary table torque of the pressure operation machine, the mechanical transmission efficiency, power, and speed. After analysis by the control platform and output of the data analysis results, warning information is finally sent through the warning module.

9. A method for on-site online testing of the torque of the rotary table of a pressure-operated work machine according to claim 8, characterized in that, In the S1 step, the specific steps for testing whether the diameter of the maximum torque test of the test mandrel meets the minimum diameter requirement are as follows: S1.1 Determine the force on the mandrel according to the stress state and the magnitude of the force. Let the diameter of the mandrel be d, the length be L, and the torque be T. Then the maximum torsional stress of the mandrel is: τ max = T / (π * d 3 / 16), According to the material mechanics properties of the mandrel, the maximum torsional stress τ of the material can be calculated allow , if τ max ≤τ allow , the minimum diameter of the mandrel is d0, then the size of the mandrel meets the requirements, otherwise it needs to be redesigned. The diameter of the mandrel meets the following requirements If the diameters d of the current tested upper mandrel (2) and lower mandrel (3) are greater than or equal to d0, it is determined that the diameters of the currently tested upper mandrel (2) and lower mandrel (3) meet the requirements; S1.2 For the strength of the mandrel and spline, bending fatigue is used to ensure the bending strength of the spline, and contact fatigue is used to ensure the contact fatigue life of the spline teeth; S1.2.1 Bending fatigue check, the calculation method is as follows: Among them, N is the bending life, K f is the fatigue strength coefficient, S f is the stress correction coefficient, K b is the size correction coefficient, K t is the temperature correction coefficient, K r is the reliability correction coefficient, K x 、K y 、K a are the load correction coefficients, σ a is the equivalent stress amplitude, and δ is the diameter of the spline. If the bending life N of the spline is N≥N0, where N0 represents the bending fatigue life of the spline, i.e., the frequency, then the bending fatigue life of the spline meets the requirements; S1.2.2 Contact fatigue check, the calculation method is as follows: Calculate the contact stress of the spline, where σ c is the contact stress, T is the torque, b is the number of teeth across, m is the module, n is the number of teeth, v is the Poisson's ratio, and E is the modulus of elasticity. Substitute the data to calculate: To calculate the contact fatigue strength of the spline, use the following formula for calculation, Among them, σ -1 is the fatigue limit, σ k is the strength limit of the material, k f0 is the fatigue strength coefficient, b is the number of teeth across, d is the base circle diameter of the spline, F is the load, k w is the stress concentration coefficient, L is the effective length, r is the base circle radius, and c, d, e are empirical coefficients; If σ -1 > σ c , the spline at the mandrel connection part meets the strength check requirements.

10. A method for on-site online testing of the torque of the rotary table of a workover rig under pressure according to claim 8, characterized in that The specific steps for the analysis by the control platform in the S3 step are: Let the real-time rotary table torque of the pressure operation machine collected be T, the mechanical transmission efficiency be k, P be the power, n be the speed, and the calculated torque of the rotary table of the pressure operation machine be T0. Then the torque test method is as follows: When n = n i , and β ≥ ε, the torque of the pressure - operated work machine meets the functional usage requirements; When n = n i and β < ε, the torque of the pressure - operated work machine does not meet the functional requirements;

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