Compound control device and method for tightening process of oil well pipe and coupling

Abstract

The invention discloses a compound control device and method for the tightening process of an oil well pipe and a coupling, and the device comprises a torque measurement device which is disposed on a tightening chuck and is used for measuring the output torque of the tightening chuck; the J value measuring device is arranged above the oil well pipe and the coupling tightening station and is used for measuring J value data of the coupling; the movable clamping controller is connected with the movable clamping device; the tightening chuck controller is connected with the tightening chuck; the in-place signal switch is used for detecting an in-place signal of the oil well pipe; the data interface unit is used for receiving the target J value and the target torque of the oil well pipe and the coupling; and the screwing control unit is used for receiving data of the torque measuring device, the J value measuring device, the in-place signal switch and the data interface unit and outputting a control instruction to the movable clamping controller and the tightening chuck controller. According to the method, the J value and the torque are measured in real time and are continuously compared with the target J value and the target torque, and the out-of-tolerance of the J value is reduced under the condition that the torque is guaranteed.

Description

Technical Field

[0001] The invention relates to a production process control technology for oil well pipes, and more specifically to a composite control device and method for the tightening process of oil well pipes and couplings. Background Art

[0002] Oil well pipe is the main petroleum pipe material, which plays a pivotal role in oil and gas exploration and development. Oil well pipes are connected to each other through couplings, which is the weakest link in the oil well pipe pipeline. The quality of its connection directly affects the safety, reliability and life of the oil well pipe. According to the survey of the American Petroleum Institute (API), most oil well pipe failures occur at the coupling connection. Therefore, tightening and making up the coupling of oil well pipe is one of the key processes of the manufacturer. The quality of the coupling tightening largely determines the production quality of the enterprise's oil well pipe.

[0003] The thread of the coupling is a tapered pipe thread. The connection strength and sealing of the thread are achieved by the interference produced after tightening the coupling. The API standard specifies in detail the minimum and maximum values ​​of the tightening torque of each type of oil well pipe and coupling, and also specifies the J value as an important coupling screwing parameter. 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 dimension of the pipe body thread and the coupling thread, reflecting the meshing length of the internal and external threads, the interference of tightening, etc. Since it is difficult to measure the J value during the coupling screwing process, each manufacturer only uses torque to control the screwing of the coupling. In the tightening unit, the target torque is set. When the coupling is tightened to the target torque, the screwing is stopped. In theory, the threads of the coupling and the steel pipe should be in the best matching position at this time. However, in actual production, due to the influence of thread processing error, coupling ellipticity error, thread grease accumulation, and even thread misthreading, the torque cannot fully reflect the matching of the oil well pipe and coupling threads, which easily leads to the too discrete distribution of the coupling tightening J value and the increase of product failure rate. At the same time, since the J value is more convenient for users to measure and inspect, in recent years, the problems of scrap and quality objections caused by unqualified J values ​​have become increasingly prominent. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a composite control device and method for the tightening process of oil well pipes and couplings, by real-time measurement of the tightening J value and torque, which are continuously compared with the target J value and target torque, and the J value deviation is reduced while ensuring the torque, so as to complete the coupling tightening operation.

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

[0006] The first aspect of the present invention provides a composite control device for the tightening process of an oil well pipe and a coupling, comprising:

[0007] A torque measuring device, provided on the tightening chuck, for measuring the output torque of the tightening chuck;

[0008] The J value measuring device is installed above the oil well pipe and coupling tightening station to measure the J value data of the coupling;

[0009] A mobile clamping controller, connected to the mobile clamping device, for controlling the movement of the mobile clamping device;

[0010] A tightening chuck controller, connected to the tightening chuck, for controlling the movement of the tightening chuck;

[0011] An in-place signal switch, used to detect an in-place signal of the oil well pipe;

[0012] A data interface unit, used for receiving the target J value and target torque data of the oil well pipe and the coupling;

[0013] The screwing control unit is used to receive data from the torque measuring device, the J value measuring device, the in-position signal switch, and the data interface unit, and output control instructions to the mobile clamping controller and the tightening chuck controller.

[0014] Preferably, the J value measuring device measures the J value data in a non-contact manner.

[0015] Preferably, the screw connection control unit is an industrial computer.

[0016] The second aspect of the present invention provides a composite control method for the tightening process of oil well pipes and couplings:

[0017] During the process of screwing the coupling into the oil well pipe, the torque increases and the J value decreases. The torque and the J value are measured in real time by the composite control device for the tightening process of the oil well pipe and the coupling, and are continuously compared with the target torque and the target J value. The J value deviation is reduced while the torque is guaranteed, and the coupling screwing operation is completed.

[0018] Preferably, the real-time measurement of torque and J value and comparison with target torque and target J value specifically include the following steps:

[0019] S1, the arrival signal switch detects that the oil well pipe arrives at the coupling tightening station, and the data interface unit collects the maximum value, minimum value of the target J value required to be controlled by the oil well pipe and the coupling, as well as the maximum value, minimum value and optimal value of the target torque;

[0020] 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;

[0021] 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 screw into the oil well pipe;

[0022] S4, the torque measuring device measures the torque, and the J value measuring device measures the J value;

[0023] S5, the screwing control unit determines whether the torque reaches the minimum value of the target torque, if so, proceeds to step S6, if not, returns to step S4;

[0024] S6, the screwing control unit determines whether the J value is less than the minimum value of the target J value, if so, proceeds to step S12, if not, proceeds to step S7;

[0025] S7, the torque measuring device continues to measure the torque, and the J value measuring device continues to measure the J value;

[0026] S8, the screwing control unit determines whether the torque reaches the optimal torque, if so, proceeds to step S9, if not, returns to step S6;

[0027] S9, the screwing control unit determines whether the J value is less than the maximum value of the target J value, if so, proceeds to step S12, if not, proceeds to step S10;

[0028] S10, the torque measuring device continues to measure the torque, and the J value measuring device continues to measure the J value;

[0029] S11, the screwing control unit determines whether the torque reaches the maximum value of the target torque, if so, proceeds to step S12, if not, returns to step S9;

[0030] S12, the screwing control unit sends a command to the tightening chuck controller to control the tightening chuck to stop rotating and loosen the coupling;

[0031] S13, 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.

[0032] The composite control device and method for the tightening process of an oil well pipe and a coupling provided by the present invention can measure the J value and torque in real time during the process of screwing the coupling into the oil well pipe, and continuously compare them with the target torque and the required range of the J value, thereby reducing the J value deviation under the condition of ensuring the torque and completing the coupling screwing operation, which has a good effect on ensuring the quality of the coupling screwing. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the composite control device of the present invention;

[0034] Figure 2 It is a schematic diagram of the J value between the oil well pipe and the coupling;

[0035] Figure 3 It is a flow chart of the composite control method of the present invention. DETAILED DESCRIPTION

[0036] 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.

[0037] Combination Figure 1 As shown, the present invention provides a composite control device for the tightening process of an oil well pipe and a coupling, comprising:

[0038] The torque measuring device 1 is installed on the tightening chuck 2 to measure the output torque of the tightening chuck 2 in real time and transmit the measurement result to the tightening control unit 11 in real time;

[0039] The J value measuring device 3 is installed above the oil well pipe 4 and the coupling tightening station, and measures the J value data of the coupling 5 when it is tightened in real time in a non-contact manner, and transmits the measurement result to the tightening control unit 11 in real time;

[0040] The mobile clamping controller 6 is connected to the mobile clamping device 7, and is used to control the clamping and loosening of the oil well pipe 4 by the mobile clamping device 7, and can drive the oil well pipe 4 to move in the horizontal direction, and receives the control command output by the screwing control unit 11;

[0041] The tightening chuck controller 8 is connected to the tightening chuck 2, and is used to control the tightening chuck 2 to tighten and loosen the coupling 5, and can drive the coupling 5 to rotate, and receive the control command output by the tightening control unit 11;

[0042] The in-place signal switch 9 is a limit switch for detecting whether the oil well pipe 9 has reached the coupling tightening position. When the oil well pipe 9 is in place, it outputs a signal to the tightening control unit 11;

[0043] The data interface unit 10 is a data signal communication device for receiving the minimum and maximum values ​​of the target J value of the current oil well pipe 4 and the coupling 5, as well as the minimum, maximum and optimal values ​​of the target torque, and transmitting these data to the screwing control unit 11;

[0044] The tightening control unit 11 is used to receive the torque data, J value data, in-place signal, oil well pipe and coupling specifications, target torque and J value data transmitted by the torque measuring device 1, the J value measuring device 3, the in-place signal switch 9, and the data interface unit 10, and output control instructions to the mobile clamping controller 6 and the tightening chuck controller 8 to drive the mobile clamping device 7 and the tightening chuck 2 to perform the tightening operation.

[0045] The screw connection control unit 11 is an industrial computer, which mainly completes tasks such as signal and data collection, screw connection control output execution, etc.

[0046] The tightening chuck 2 is a device at the coupling tightening station, used to tighten the coupling 5 onto the oil well pipe 4. It can clamp and drive the coupling 5 to rotate, and the horizontal position remains fixed during rotation.

[0047] The mobile clamping device 7 is a device of the coupling tightening station, which is used to clamp the oil well pipe 4 so that it is fixed in the rotation direction but can move in the horizontal direction.

[0048] Combination Figure 2 As shown, the J value is defined as the distance between the end face of the oil well pipe 4 and the center plane of the coupling 5. It is the assembly dimension of the oil well pipe 4 and the coupling 5, reflecting the degree of fit between the threads of the coupling 5 and the oil well pipe 4. It is also an important process and quality control parameter for the production of oil well pipes, and has clear requirements in various domestic and international standards.

[0049] The screwing operation of oil well pipe and coupling is divided into two steps: pre-tightening and machine tightening: pre-tightening can be hand tightening, which is usually replaced by machines in steel pipe production enterprises. A smaller torque is set for pre-tightening, and the coupling is screwed onto the oil well pipe to fix it. Then, the coupling is screwed to the next coupling tightening station for machine tightening. The torque increases continuously during the process of the coupling being screwed into the oil well pipe. When the torque reaches the set value, the tightening operation of the coupling is completed. The present invention also provides a composite control method for the tightening process of oil well pipe and coupling:

[0050] During the process of screwing the coupling into the oil well pipe, the torque increases and the J value decreases. The composite control device of the oil well pipe and coupling tightening process measures the torque and J value in real time, and continuously compares them with the target torque and target J value. The J value deviation is reduced while the torque is guaranteed, and the coupling tightening operation is completed.

[0051] Example 1

[0052] Combination Figure 3 As shown, in the composite control method of the present invention, real-time measurement of torque and J value and comparison with target torque and target J value specifically include the following steps:

[0053] S1, the arrival signal switch 9 detects that the oil well pipe 4 has arrived at the coupling tightening station, and the data interface unit 10 collects the maximum value 15.5mm and the minimum value 9.5mm of the target J value required to be controlled by the oil well pipe 4 and the coupling 5, as well as the maximum value 2800N, the minimum value 2200N and the optimal value 2500N of the target torque;

[0054] S2, the screwing control unit 11 sends a command to the mobile clamping controller 6 to control the mobile clamping device 7 to clamp the oil well pipe 4, and send the pre-tightened coupling 5 on the oil well pipe 4 into the tightening chuck 2;

[0055] S3, the screwing control unit 11 sends a command to the tightening chuck controller 8 to control the tightening chuck 2 to clamp the coupling 5, and rotate to drive the coupling 5 to screw into the oil well pipe 4;

[0056] S4, the torque measuring device 1 measures the torque, and the J value measuring device 3 measures the J value;

[0057] S5, the screwing control unit 11 determines whether the torque reaches the minimum value of the target torque 2200N, if yes, then proceeds to step S6, if no, then returns to step S4;

[0058] S6, the screwing control unit 11 determines whether the J value is less than the minimum value of the target J value 9.5 mm, if so, proceeding to step S12, if not, proceeding to step S7;

[0059] S7, the torque measuring device 1 continues to measure the torque, and the J value measuring device 3 continues to measure the J value;

[0060] S8, the screwing control unit 11 determines whether the torque reaches the optimal value of the target torque 2500N, if yes, then goes to step S9, if no, then goes back to step S6;

[0061] S9, the screwing control unit 11 determines whether the J value is less than the maximum value of the target J value 15.5 mm, if so, proceeding to step S12, if not, proceeding to step S10;

[0062] S10, the torque measuring device 1 continues to measure the torque, and the J value measuring device 3 continues to measure the J value;

[0063] S11, the screwing control unit 11 determines whether the torque reaches the maximum value of the target torque 2800N, if yes, then goes to step S12, if no, then goes back to step S9;

[0064] S12, the screwing control unit 11 sends a command to the tightening chuck controller 8 to control the tightening chuck 2 to stop rotating and loosen the coupling 5;

[0065] S13, the screwing control unit 11 sends a command to the mobile clamping controller 6 to control the mobile clamping device 7 to move the oil well pipe 4 and the coupling 5 back to the initial position, and loosen the oil well pipe 4 to complete the current screwing operation of the oil well pipe 4 and the coupling 5.

[0066] Example 2

[0067] Combination Figure 3 As shown, in the composite control method of the present invention, real-time measurement of torque and J value and comparison with target torque and target J value specifically include the following steps:

[0068] S1, the arrival signal switch 9 detects that the oil well pipe 4 arrives at the coupling tightening station, and the data interface unit 10 collects the maximum value 19.05mm and the minimum value 6.35mm of the target J value required to be controlled by the oil well pipe 4 and the coupling 5, as well as the maximum value 3000N, the minimum value 2300N and the optimal value 2700N of the target torque;

[0069] S2, the screwing control unit 11 sends a command to the mobile clamping controller 6 to control the mobile clamping device 7 to clamp the oil well pipe 4, and send the pre-tightened coupling 5 on the oil well pipe 4 into the tightening chuck 2;

[0070] S3, the screwing control unit 11 sends a command to the tightening chuck controller 8 to control the tightening chuck 2 to clamp the coupling 5, and rotate to drive the coupling 5 to screw into the oil well pipe 4;

[0071] S4, the torque measuring device 1 measures the torque, and the J value measuring device 3 measures the J value;

[0072] S5, the screwing control unit 11 determines whether the torque reaches the minimum value of the target torque 2300N, if yes, then proceeds to step S6, if no, then returns to step S4;

[0073] S6, the screwing control unit 11 determines whether the J value is less than the minimum value of the target J value 6.35 mm, if so, proceeding to step S12, if not, proceeding to step S7;

[0074] S7, the torque measuring device 1 continues to measure the torque, and the J value measuring device 3 continues to measure the J value;

[0075] S8, the screwing control unit 11 determines whether the torque reaches the optimal value of the target torque 2700N, if yes, then goes to step S9, if no, then goes back to step S6;

[0076] S9, the screwing control unit 11 determines whether the J value is less than the maximum value of the target J value 19.05 mm, if so, proceeding to step S12, if not, proceeding to step S10;

[0077] S10, the torque measuring device 1 continues to measure the torque, and the J value measuring device 3 continues to measure the J value;

[0078] S11, the screwing control unit 11 determines whether the torque reaches the maximum value of the target torque 3000N, if yes, then goes to step S12, if no, then goes back to step S9;

[0079] S12, the screwing control unit 11 sends a command to the tightening chuck controller 8 to control the tightening chuck 2 to stop rotating and loosen the coupling 5;

[0080] S13, the screwing control unit 11 sends a command to the mobile clamping controller 6 to control the mobile clamping device 7 to move the oil well pipe 4 and the coupling 5 back to the initial position, and loosen the oil well pipe 4 to complete the current screwing operation of the oil well pipe 4 and the coupling 5.

[0081] 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 composite control device for the tightening process of oil well pipe and coupling, It is characterized in that include: A torque measuring device, provided on the tightening chuck, for measuring the output torque of the tightening chuck; The J value measuring device is installed above the oil well pipe and coupling tightening station to measure the J value data of the coupling; 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 in-place signal switch, used to detect an in-place signal of the oil well pipe; A data interface unit, used for receiving the target J value and target torque data of the oil well pipe and the coupling; The screwing control unit is used to receive data from the torque measuring device, the J value measuring device, the in-position signal switch, and the data interface unit, and output control instructions to the mobile clamping controller and the tightening chuck controller.

2. The composite control device for the tightening process of the oil well pipe and the coupling according to claim 1, Features: The J value measuring device measures the J value data in a non-contact manner.

3. The composite control device for the tightening process of the oil well pipe and the coupling according to claim 1, Features: The screw connection control unit is an industrial computer.

4. A composite control method for the tightening process of oil well pipe and coupling, Features: During the process of screwing the coupling into the oil well pipe, the torque increases and the J value decreases. The torque and the J value are measured in real time by the composite control device for the tightening process of the oil well pipe and the coupling as described in any one of claims 1 to 3, and are continuously compared with the target torque and the target J value. The J value deviation is reduced while the torque is guaranteed, and the coupling screwing operation is completed.

5. The composite control method for tightening the oil well pipe and coupling according to claim 4, It is characterized in that The real-time measurement of torque and J value and comparison with target torque and target J value specifically include the following steps: S1, the arrival signal switch detects that the oil well pipe arrives at the coupling tightening station, and the data interface unit collects the maximum and minimum values ​​of the target J value required to be controlled by the oil well pipe and the coupling, as well as the maximum and minimum values ​​of the target torque; 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 screw into the oil well pipe; S4, the torque measuring device measures the torque, and the J value measuring device measures the J value; S5, the screwing control unit determines whether the torque reaches the minimum value of the target torque, if so, proceeds to step S6, if not, returns to step S4; S6, the screwing control unit determines whether the J value is less than the minimum value of the target J value, if so, proceeds to step S12, if not, proceeds to step S7; S7, the torque measuring device continues to measure the torque, and the J value measuring device continues to measure the J value; S8, the screwing control unit determines whether the torque reaches the target torque, if so, proceeds to step S8, if not, returns to step S6; S9, the screwing control unit determines whether the J value is less than the maximum value of the target J value, if so, proceeds to step S12, if not, proceeds to step S10; S10, the torque measuring device continues to measure the torque, and the J value measuring device continues to measure the J value; S11, the screwing control unit determines whether the torque reaches the maximum value of the target torque, if so, proceeds to step S12, if not, returns to step S9; S12, the screwing control unit sends a command to the tightening chuck controller to control the tightening chuck to stop rotating and loosen the coupling; S13, 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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