Oil well pipe coupling screwing closed-loop control device and method based on J value real-time measurement

Abstract

The invention discloses an oil well pipe coupling screwing closed-loop control device and method based on J value real-time measurement, and the device comprises a J value measurement device which is disposed above a screwing station and is used for online real-time measurement of J value data; the movable clamping controller is connected with the movable clamping device and is used for controlling the action of the movable clamping device; the tightening chuck controller is connected with the tightening chuck and is used for controlling the action of the tightening chuck; the in-place signal detector is used for detecting whether the oil well pipe reaches the screwing station or not; the process signal interface unit is used for receiving target J value data of the oil well pipe and the coupling; and the screwing control unit is used for receiving data of the J value measuring device, the in-place signal detector and the process signal interface unit and outputting a control instruction to the movable clamping controller and the screwing chuck controller. According to the method, it is guaranteed that the actual coupling tightening J value meets the requirement, and the production qualification rate is increased.

Description

Technical Field

[0001] The invention relates to a production process control technology for oil well pipes, and more specifically to a closed-loop control device and method for tightening a coupling of an oil well pipe based on real-time measurement of a J value. Background Art

[0002] Oil well pipes occupy an important position in the oil industry and are the foundation of the oil industry. Their status is not only reflected in their large consumption and high cost, but more importantly, their quality and performance are closely related to the development of the oil industry. Oil well pipes are connected through couplings. In recent years, with the improvement of oil field requirements for the quality of oil well pipe connections, the connection between oil well pipes and couplings must meet both the connection strength requirements and the sealing requirements. The current oil well pipes are pre-screwed with couplings at one end of the pipe body before leaving the factory, and then screwed and installed with other oil well pipes after arriving at the oil field to achieve the extended sealing connection of the oil well pipe and meet the requirements of oil field production operations. The quality of the screwing of oil well pipes and couplings is judged by the J value. The J value refers to the distance from the end face of the oil well pipe body to the center face of the coupling. It is the assembly size of the pipe body thread and the coupling thread. It reflects the meshing length of the internal and external threads, the interference of tightening, etc., which determines the connection quality of the oil well pipe. It is an important process and quality control parameter for the production of oil well pipes. There are clear technical standards and requirements at home and abroad.

[0003] Tightening the coupling onto the oil well pipe is a very important process in steel pipe production and quality control, and this work is completed by a pipe tightening machine. At present, in actual production, the tightening of the oil well pipe coupling is usually controlled by torque, that is, according to the tightening requirements, a target torque range is set, and the torque will continue to increase during the process of screwing the coupling onto the oil well pipe. When the target torque is reached, the screwing is stopped. In industrial production, the torque will be affected by many factors, such as the thread size deviation of the coupling and the oil well pipe, grease and dust, screwing speed, etc., which will affect the change of torque during the screwing process, so that it is impossible to ensure that the actual coupling tightening J value meets the requirements, resulting in unqualified coupling screwing. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide an oil well pipe coupling tightening closed-loop control device and method based on real-time measurement of J value, so as to ensure that the actual coupling tightening J value meets the requirements and improve the production qualification rate.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] The first aspect of the present invention provides a closed-loop control device for tightening a pipe coupling of an oil well based on real-time measurement of a J value, comprising:

[0007] The J value measuring device is located above the screwing station to measure the J value data online in real time;

[0008] A mobile clamping controller, connected to the mobile clamping device, for controlling the movement of the mobile clamping device;

[0009] A tightening chuck controller, connected to the tightening chuck, for controlling the movement of the tightening chuck;

[0010] An arrival signal detector, used to detect whether the oil well pipe has arrived at the screwing station;

[0011] A process signal interface unit, used for receiving target J value data of the oil well pipe and the coupling;

[0012] The tightening control unit is used to receive data from the J value measuring device, the in-position signal detector, and the process signal interface unit, and output control instructions to the mobile clamping controller and the tightening chuck controller.

[0013] Preferably, the screw connection control unit is an industrial computer.

[0014] The second aspect of the present invention provides a closed-loop control method for oil well pipe coupling screwing based on real-time measurement of J value:

[0015] In the process of screwing the coupling into the oil-well pipe, the oil-well pipe coupling screwing closed-loop control device based on real-time measurement of the J value provided by the first aspect of the present invention measures the J value in real time, obtains data of the current J value, and compares it with the target J value, controls the coupling to be continuously screwed into the oil-well pipe, until the actually measured J value reaches the target J value, and completes the coupling screwing operation.

[0016] Preferably, the real-time measurement of the J value and comparison with the target J value specifically comprises the following steps:

[0017] S1, when the arrival signal detector detects that the oil well pipe has arrived at the screwing station, the process signal interface unit collects data of the target J value required to be controlled by the oil well pipe and the coupling;

[0018] S2, the screwing control unit sends a command to the mobile clamping controller to control the mobile clamping device to clamp the oil well pipe, and send the pre-tightened coupling on the oil well pipe into the tightening chuck;

[0019] S3, the screwing control unit sends a command to the tightening chuck controller to control the tightening chuck to clamp the coupling and rotate to drive the coupling to be screwed into the oil well pipe;

[0020] S4, the J value measuring device measures the J value in real time;

[0021] S5, comparing the J value obtained by real-time measurement with the target J value. If the J value obtained by real-time measurement reaches the target J value, proceed to step S6; if not, return to step S4;

[0022] S6, the screwing control unit sends a command to the tightening chuck controller to control the tightening chuck to stop rotating and loosen the coupling;

[0023] S7, the screwing control unit sends a command to the mobile clamping controller to control the mobile clamping device to move the oil well pipe and the coupling back to the initial position together, and loosen the oil well pipe to complete the current screwing operation of the oil well pipe and the coupling.

[0024] The invention provides a closed-loop control device and method for oil well pipe coupling screwing based on real-time measurement of J value. The device and method realize closed-loop control of the screwing process by real-time measurement of J value during the process of screwing the coupling into the oil well pipe and comparing it with the target J value. Compared with the traditional torque-based control method, the device and method overcome many factors that affect the torque size and have a good effect on ensuring the screwing quality of the coupling. At the same time, the system is easy to implement and use in actual production and has strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the oil well pipe coupling screwing closed-loop control device of the present invention;

[0026] Figure 2 It is a schematic diagram of the J value between the oil well pipe and the coupling;

[0027] Figure 3 The invention is a flow chart of a closed-loop control method for tightening a coupling of an oil well pipe. DETAILED DESCRIPTION

[0028] In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Combination Figure 1 As shown, the present invention provides a closed-loop control device for tightening oil well pipe couplings based on real-time measurement of J value, comprising:

[0030] The J value measuring device 1 is installed above the screwing station and is a device for measuring the J value data of the current coupling tightening in real time online, and transmits the measurement result to the screwing control unit 10 in real time;

[0031] The mobile clamping controller 2 is connected to the mobile clamping device 3 and is a device for driving the mobile clamping device 3 to move, and is used to control the clamping and loosening of the oil well pipe 4 by the mobile clamping device 3, and can drive the oil well pipe 4 to move, and accept the output control of the screwing control unit 10;

[0032] The tightening chuck controller 5 is connected to the tightening chuck 6 and is a device for driving the tightening chuck 6 to move, and is used to control the tightening chuck 6 to clamp and loosen the coupling 7, and can drive the coupling 7 to rotate, and is controlled by the output of the tightening control unit 10;

[0033] The arrival signal detector 8 is a device for detecting whether the oil well pipe 4 has reached the screwing position. When the oil well pipe 4 is in place, a signal is output to the screwing control unit 10;

[0034] The process signal interface unit 9 is a data signal communication device for receiving the specification data of the current screwed oil well pipe 4 and the coupling 7 and the target J value data required for control, and transmitting these data to the screwed control unit 10;

[0035] The tightening control unit 10 is an industrial computer with signal and data acquisition processing and control output functions, which is used to receive J value data, in-place signals, specifications of oil well pipes 4 and couplings 7, and target J value requirements from the J value measuring device 1, the in-place signal detector 8, and the process signal interface unit 9, and output control instructions to the mobile clamping controller 2 and the tightening chuck controller 5 to drive the mobile clamping device 3 and the tightening chuck 6 to perform tightening operations.

[0036] Combination Figure 2 As shown, the J value is defined as the distance from the end face of the oil well pipe 4 to the center plane of the coupling 7. It is the assembly dimension of the oil well pipe 4 and the coupling 7, reflects the connection quality of the oil well pipe 4 and the coupling 7, and is an important process and quality control parameter. There are clear technical standards and requirements both at home and abroad.

[0037] The present invention also provides a closed-loop control method for oil well pipe coupling screwing based on real-time measurement of J value:

[0038] In the process of screwing the coupling into the oil well pipe, the oil well pipe coupling screwing closed-loop control device based on the real-time measurement of the J value measures the J value in real time, obtains the data of the current J value, and compares it with the target J value, controls the coupling to be screwed into the oil well pipe continuously, until the actually measured J value reaches the target J value, and completes the coupling screwing operation.

[0039] Example 1

[0040] Combination Figure 3 As shown, real-time measurement of the J value and comparison with the target J value specifically includes the following steps:

[0041] S1. When the arrival signal detector 8 detects that the oil well pipe 4 has arrived at the screwing station, the process signal interface unit 9 collects the data of the target J value required to be controlled by the current oil well pipe 4 and the coupling 7, which is 12.7 mm;

[0042] S2, the screwing control unit 10 sends a command to the mobile clamping controller 2 to control the mobile clamping device 3 to clamp the oil well pipe 4, and send the pre-tightened coupling 7 on the oil well pipe 4 into the tightening chuck 6;

[0043] S3, the screwing control unit 10 sends a command to the tightening chuck controller 5 to control the tightening chuck 6 to clamp the coupling 7, and rotate to drive the coupling 7 to screw into the oil well pipe 4;

[0044] S4, the J value measuring device 1 measures the J value in real time;

[0045] S5, compare the J value obtained by real-time measurement with the target J value of 12.7 mm. If the J value obtained by real-time measurement reaches the target J value, proceed to step S6; if not, return to step S4;

[0046] S6, the screwing control unit 10 sends a command to the tightening chuck controller 5 to control the tightening chuck 6 to stop rotating and loosen the coupling 7;

[0047] S7, the screwing control unit 10 sends a command to the mobile clamping controller 2 to control the mobile clamping device 3 to move the oil well pipe 4 and the coupling 5 back to the initial position, and loosen the oil well pipe 4, completing the current screwing operation of the oil well pipe 4 and the coupling 7.

[0048] Example 2

[0049] The process of the closed-loop control method for oil well pipe coupling screwing based on real-time measurement of J value in this embodiment is shown in the attached Figure 3 As shown, the following steps are included:

[0050] S1. When the arrival signal detector 8 detects that the oil well pipe 4 has arrived at the screwing station, the process signal interface unit 9 collects the data of the target J value required to be controlled by the current oil well pipe 4 and the coupling 7, which is 11.5 mm;

[0051] S2, the screwing control unit 10 sends a command to the mobile clamping controller 2 to control the mobile clamping device 3 to clamp the oil well pipe 4, and send the pre-tightened coupling 7 on the oil well pipe 4 into the tightening chuck 6;

[0052] S3, the screwing control unit 10 sends a command to the tightening chuck controller 5 to control the tightening chuck 6 to clamp the coupling 7, and rotate to drive the coupling 7 to screw into the oil well pipe 4;

[0053] S4, the J value measuring device 1 measures the J value in real time;

[0054] S5, compare the J value obtained by real-time measurement with the target J value of 11.5 mm. If the J value obtained by real-time measurement reaches the target J value, proceed to step S6; if not, return to step S4;

[0055] S6, the screwing control unit 10 sends a command to the tightening chuck controller 5 to control the tightening chuck 6 to stop rotating and loosen the coupling 7;

[0056] S7, the screwing control unit 10 sends a command to the mobile clamping controller 2 to control the mobile clamping device 3 to move the oil well pipe 4 and the coupling 5 back to the initial position, and loosen the oil well pipe 4, completing the current screwing operation of the oil well pipe 4 and the coupling 7.

[0057] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention, and are not intended to limit the present invention. As long as they are within the spirit of the present invention, any changes or modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A closed-loop control device for oil well pipe coupling screwing based on real-time measurement of J value, characterized in that: include: The J value measuring device is located above the screwing station to measure the J value data online in real time; A mobile clamping controller, connected to the mobile clamping device, for controlling the movement of the mobile clamping device; A tightening chuck controller, connected to the tightening chuck, for controlling the movement of the tightening chuck; An arrival signal detector, used to detect whether the oil well pipe has arrived at the screwing station; A process signal interface unit, used for receiving target J value data of the oil well pipe and the coupling; The tightening control unit is used to receive data from the J value measuring device, the in-position signal detector, and the process signal interface unit, and output control instructions to the mobile clamping controller and the tightening chuck controller.

2. The oil well pipe coupling screwing closed-loop control device based on real-time measurement of J value according to claim 1 is characterized in that: The screw connection control unit is an industrial computer.

3. A closed-loop control method for oil well pipe coupling screwing based on real-time measurement of J value, characterized in that: During the process of screwing the coupling into the oil-well pipe, the oil-well pipe coupling screwing closed-loop control device based on real-time measurement of the J value as claimed in any one of claims 1-2 measures the J value in real time, obtains data of the current J value, and compares it with the target J value, controls the coupling to be continuously screwed into the oil-well pipe until the actually measured J value reaches the target J value, and completes the coupling screwing operation.

4. The closed-loop control method for oil well pipe coupling screwing based on real-time measurement of J value according to claim 3 is characterized in that: The real-time measurement of the J value and comparison with the target J value specifically comprises the following steps: S1, when the arrival signal detector detects that the oil well pipe has arrived at the screwing station, the process signal interface unit collects data of the target J value required to be controlled by the oil well pipe and the coupling; S2, the screwing control unit sends a command to the mobile clamping controller to control the mobile clamping device to clamp the oil well pipe, and send the pre-tightened coupling on the oil well pipe into the tightening chuck; S3, the screwing control unit sends a command to the tightening chuck controller to control the tightening chuck to clamp the coupling and rotate to drive the coupling to be screwed into the oil well pipe; S4, the J value measuring device measures the J value in real time; S5, comparing the J value obtained by real-time measurement with the target J value. If the J value obtained by real-time measurement reaches the target J value, proceed to step S6; if not, return to step S4; S6, the screwing control unit sends a command to the tightening chuck controller to control the tightening chuck to stop rotating and loosen the coupling; S7, the screwing control unit sends a command to the mobile clamping controller to control the mobile clamping device to move the oil well pipe and the coupling back to the initial position together, and loosen the oil well pipe to complete the current screwing operation of the oil well pipe and the coupling.

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