Method and system for measuring the online value of the tightening j between an oil well pipe and a coupling

Abstract

This invention discloses an online measurement method and system for measuring the J-value of tightening between an oil well pipe and a coupling, comprising the following steps: S1, obtaining the current diameter dimensions of the coupling and the oil well pipe; S2, at the pre-tightening station, acquiring and obtaining the end face position of the oil well pipe using a laser profile measuring instrument; S3, acquiring and obtaining the length value of the coupling and the length of the coupling screwed into the oil well pipe using the laser profile measuring instrument; S4, conveying the coupling and the oil well pipe to the dynamic tightening station; S5, measuring and obtaining the moving distance value of the oil well pipe using a laser stroke measuring instrument; S6, the J-value measurement unit calculates the J-value based on the diameter dimensions of the coupling and the oil well pipe, the data obtained by the laser profile measuring instrument, and the data obtained by the laser stroke measuring instrument. This invention uses a laser sensor to perform real-time measurements of the coupling and the oil well pipe at both the pre-tightening and dynamic tightening stations, obtaining the position, dimensions, and stroke data of the oil well pipe and the coupling during the tightening process, thereby accurately measuring the J-value.

Description

Technical Field

[0001] This invention relates to measurement technology in the steel pipe production process, and more specifically, to an online measurement method and system for measuring the J-value of the tightening between the oil well pipe and the coupling. Background Technology

[0002] Oil well tubing plays a vital role in the petroleum industry, serving as its foundation. Oil well tubing operates under harsh conditions; for example, tubing strings and casing strings typically withstand internal or external pressures of hundreds or even thousands of atmospheres, tensile loads of hundreds of tons, and the effects of high temperatures and severe corrosive media. The safety, reliability, service life, and economic efficiency of oil well tubing are extremely important to the petroleum industry. Oil well tubing is connected via couplings. In recent years, with the increasing demands for connection quality in oilfields, the connection between the tubing and couplings must meet both strength and sealing requirements. Currently, oil well tubing is pre-coated with couplings at one end before leaving the factory. Upon arrival at the oilfield, it is then screwed onto other oil well tubing to achieve extended, sealed connections, meeting the requirements of oilfield production operations. The coupling screwing process is a crucial quality control step, directly affecting whether the sealing performance and connection strength requirements of the subsequent extended connections are met.

[0003] The industry typically uses the J-value measurement method to inspect the quality of well tubing coupling tightening and installation. In the API standard, the J-value is defined as "the distance from the pipe end to the center face of the coupling under machine tightening." The J-value is the assembly dimension of the pipe end thread and the coupling thread, actually reflecting the engagement length of the internal and external threads, the interference fit, etc. Currently, the measurement of the coupling tightening J-value is entirely manual. Generally, a steel tape measure or depth caliper is used to measure the length from the pipe end face to one end of the coupling, and then a vernier caliper is used to measure the coupling length. The J-value is then calculated. There are also some improved J-value measuring tools. For example, the patent "Online Oil Casing J-value Measuring Ruler" (CN2214661Y) introduces a J-value measuring ruler integrating a measuring contact tool, which still falls under the category of J-value rulers. Another example is the patent "A Precise Control Device for the J-value of Oil Casing and Coupling Tightening" (CN204532141U), which introduces a method to improve the tightening machine to make the product J-value more accurate, but it cannot accurately measure the oil well tubing J-value online. However, these measurement methods all require manual operation, resulting in slow measurement speed, low efficiency, inconsistent standards, and large errors, making it difficult to perform online measurements on a per-well basis. Furthermore, the lack of data recording prevents digital control of the J-values ​​for all oil well pipes. Summary of the Invention

[0004] To address the aforementioned deficiencies in existing technologies, the purpose of this invention is to provide an online measurement method and system for the tightening J-value between oil well tubing and couplings. Addressing the current state and problems of oil well tubing coupling tightening J-value measurement technology, this invention uses a laser sensor to perform real-time measurements of the coupling and oil well tubing at both pre-tightening and dynamic tightening positions. This obtains the position, dimensions, and travel data of the oil well tubing and coupling during the tightening process, and calculates the distance from the end face of the oil well tubing to the center of the coupling, thereby accurately measuring the J-value.

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

[0006] On the one hand, an online measurement method for measuring the J-value of tightening between the oil well pipe and the coupling includes the following steps:

[0007] S1. Obtain the current diameter dimensions of the coupling and well casing;

[0008] S2. At the pre-tightening station, the end face position of the oil well pipe is acquired and obtained by a laser profile measuring instrument;

[0009] S3. Then, the laser profile measuring instrument is used to collect and obtain the length value of the coupling and the length value of the coupling screwed into the oil well pipe;

[0010] S4. Transport the coupling and the well pipe to the tightening station;

[0011] S5. Measure and obtain the movement distance of the oil well pipe using a laser travel measuring instrument;

[0012] The S6 J-value measuring unit calculates the J-value based on the diameter of the coupling and the well pipe, the data obtained by the laser profile measuring instrument, and the data obtained by the laser stroke measuring instrument.

[0013] Preferably, step S2 specifically includes:

[0014] Before the pre-tightening begins, when the coupling has not yet contacted the well pipe, the contour data of the well pipe is measured by the laser contour measuring instrument, and the end face position a of the well pipe is calculated and recorded.

[0015] Preferably, step S3 specifically includes:

[0016] After the pre-tightening is completed, the contour data of the coupling and the oil well pipe being screwed together is obtained by measuring the laser contour measuring instrument.

[0017] The diameter of the coupling is larger than the diameter of the well pipe, and a step shape will appear on the outline. The position b of the step is calculated, which is the end face position of the coupling on the well pipe. Then the other end face position c of the coupling is calculated. Based on the three positions a, b, and c, the length value L of the coupling and the length value D1 of the coupling pre-screwed into the well pipe can be calculated.

[0018] Preferably, in step S5, the laser travel measuring instrument measures and obtains the moving distance value of the oil well pipe, which is the length value D2 of the coupling being screwed into the oil well pipe during the screwing operation.

[0019] Preferably, in step S6, the J value = L / 2 - D1 - D2.

[0020] On the other hand, an online measurement system for measuring the tightening J-value between the well pipe and the coupling includes:

[0021] A laser profile measuring instrument is installed above the coupling and the well pipe at the pre-tightening station to measure the profile data of the coupling and the well pipe.

[0022] A laser travel measuring instrument is installed above the oil well pipe at the rotating station to measure the travel distance of the oil well pipe.

[0023] A process signal interface unit is used to collect the diameter specification data of the coupling and the well pipe.

[0024] The J-value measurement unit is used to receive contour data, travel distance value, and diameter specification data transmitted from the laser contour measuring instrument, the laser travel measuring instrument, and the process signal interface unit, and to calculate the J-value.

[0025] The online measurement system for measuring the J-value of the tightening between the oil well pipe and the coupling realizes the online measurement method for measuring the J-value of the tightening between the oil well pipe and the coupling.

[0026] The present invention provides an online measurement method and system for measuring the tightening J value between oil well pipe and coupling. The method uses a non-contact approach to achieve online automatic measurement of the tightening J value between oil well pipe and coupling. It can obtain J value data in real time during production line operation, which plays a good role in ensuring product quality and guiding production. At the same time, the system is easy to implement and use in actual production, and has strong practicality. Attached Figure Description

[0027] Figure 1 This is a flowchart illustrating the online measurement method of the present invention;

[0028] Figure 2This is a schematic diagram of the pre-tightening station measurement in the online measurement method of the present invention, wherein (a) is a schematic diagram before the pre-tightening operation and (b) is a schematic diagram after the pre-tightening operation;

[0029] Figure 3 This is a schematic diagram of the dynamic tightening station measurement in the online measurement method of the present invention;

[0030] Figure 4 This is a schematic diagram of the framework of the online measurement system of the present invention. Detailed Implementation

[0031] To better understand the above-mentioned technical solutions of the present invention, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Combination Figures 1 to 4 As shown, this invention provides an online measurement method for the tightening J-value between an oil well pipe and a coupling. The tightening operation of the oil well pipe 1 and the coupling 2 is completed through two consecutive stations. First, a pre-tightening operation is performed at the pre-tightening station. In this operation, the oil well pipe 1 is clamped and fixed in place by the fixing clamp 5. A small torque is used to pre-tighten the coupling 2 onto the oil well pipe 1 for a certain distance. Then, the oil well pipe 1 with the coupling 2 is transported to the dynamic tightening station for dynamic tightening. In this operation, the oil well pipe 1 is clamped by the moving clamp 6 and cannot rotate but can move horizontally. A larger torque is used to rotate the coupling 2 and drive the oil well pipe 1 to be tightened to the specified requirements. This invention uses laser sensors (laser profile measuring instrument 7 and laser stroke measuring instrument 8) to perform real-time measurements of the coupling 2 and the oil well pipe 1 at the pre-tightening and dynamic tightening stations, respectively, to obtain the position, size, and stroke data of the oil well pipe 1 and the coupling 2 during the tightening process, and to calculate the distance from the end face of the oil well pipe 1 to the center of the coupling 2, thereby accurately measuring the J-value. The online measurement method of this invention specifically includes the following steps:

[0033] S1. Collect the specifications of the current coupling 2 and oil well pipe 1, and obtain the diameter dimensions of the current coupling 2 and oil well pipe 1;

[0034] S2. At the pre-tightening station, the laser profile measuring instrument 7 collects profile data of a certain range of the end of the oil well pipe 1 and calculates the end face position of the oil well pipe 1.

[0035] S3. After the pre-tightening is completed, the laser profile measuring instrument 7 is used to collect the profile data of the coupling 2 and the oil well pipe 1 screwed together, and the length value of the coupling 2 and the length value of the coupling 2 screwed into the oil well pipe 1 are calculated.

[0036] S4. After completing the pre-tightening operation, transport coupling 2 and well pipe 1 to the tightening position;

[0037] S5. At the twisting station, the moving distance of the oil well pipe 1 during the entire twisting operation is measured by the laser stroke measuring instrument 8. This moving distance is also the length of the coupling 2 screwed into the oil well pipe 1 during the twisting operation.

[0038] S6. After obtaining the length data of coupling 2, the length value of coupling 2 screwed into the oil well pipe 1 during the pre-tightening operation, and the length value of coupling 2 screwed into the oil well pipe 1 during the dynamic tightening operation, the J value is calculated by the J value measurement unit 10 according to the coupling 2 tightening J value calculation method.

[0039] The above step S2 specifically includes:

[0040] Before pre-tightening begins, and before coupling 2 contacts the well pipe 1, the contour data of the well pipe 1 is measured using a laser contour measuring instrument 7. The end face position 'a' of the well pipe 1 is calculated and recorded. Figure 2 As shown in (a).

[0041] The above step S3 specifically includes:

[0042] After pre-tightening, the contour data of the coupling 2 and the well pipe 1 screwed together is measured by the laser contour measuring instrument 7. Since the diameter of the coupling 2 is larger than the diameter of the well pipe 1, a step shape with varying heights will appear on the contour line. The position b of this step is calculated, which is the end face position of the coupling 2 on the well pipe 1. Then the other end face position c of the coupling 2 is calculated. Based on the three positions a, b, and c, the length value L of the coupling 2 and the length D1 of the coupling 2 pre-tightened into the well pipe 1 can be calculated. Figure 2 As shown in (b).

[0043] In step S5 above, the laser travel measuring instrument 8 measures and obtains the travel distance of the oil well pipe 1, which is the length D2 of the coupling 2 being dynamically screwed into the oil well pipe 1 during the screwing operation. Figure 3 As shown.

[0044] In step S6 above, the J value can be calculated by combining the length value L of the coupling 2 calculated at the pre-tightening station and the length value D1 of the coupling 2 screwed into the oil well pipe 1. J value = L / 2 - D1 - D2.

[0045] See again Figure 4 As shown, the present invention also provides an online measurement system for measuring the tightening J-value between the oil well pipe and the coupling, comprising:

[0046] The laser profile measuring instrument 7, located above the coupling 2 and the oil well pipe 1 at the pre-tightening station, is a two-dimensional linear array laser range sensor used to measure the profile data of the coupling 2 and the oil well pipe 1, and transmits the results to the J-value measuring unit 10 in real time.

[0047] The laser travel measuring instrument, located above the oil well pipe 1 at the turning position, is a laser speed and length measuring sensor used to measure the moving distance of the oil well pipe 1 and transmit the result to the J value measuring unit 10 in real time.

[0048] The process signal interface unit 9 is a data signal communication device used to collect the current diameter specification data of the coupling 2 and the well pipe 1, and transmit the data to the J value measurement unit 10 in real time.

[0049] J-value measuring unit 10 is a computer device with functions such as data acquisition, processing, contour analysis and recognition, and J-value calculation. It is used to receive contour data, movement distance value, and diameter specification data transmitted from laser contour measuring instrument 7, laser stroke measuring instrument 8, and process signal interface unit 9, and to calculate and analyze the coupling tightening J-value through the J-value calculation method.

[0050] The online measurement system of this invention for measuring the tightening J value between the oil well pipe and the coupling realizes the online measurement method of this invention for measuring the tightening J value between the oil well pipe and the coupling.

[0051] Continue to refer to Figure 4 As shown, the pre-tightening chuck 3 is the equipment for the pre-tightening station, used to tighten the coupling 2 onto the oil well pipe 1. It can clamp and drive the coupling 2 to rotate, and can also move horizontally. The fixed clamping device 4 is the equipment for the pre-tightening station, used to clamp and fix the oil well pipe 1, keeping it stationary in both rotational and horizontal directions. The movable chuck 5 is the equipment for the movable tightening station, used to tighten the coupling 2 onto the oil well pipe 1. It can clamp and drive the coupling 2 to rotate, keeping its horizontal position fixed during rotation. The movable clamping device 6 is the equipment for the movable tightening station, used to clamp the oil well pipe 1, fixing it in the rotational direction, but allowing it to move horizontally.

[0052] Example 1

[0053] The online measurement method flowchart for this embodiment is attached. Figure 1 As shown, it includes the following steps:

[0054] In the first step, the J-value measurement unit 10 reads the current diameter specifications of the coupling 2 and the well pipe 1 through the process signal interface unit 9, which are 140mm and 130mm respectively.

[0055] The second step is to collect the contour data of the oil well pipe 1 within a 300mm range from the end of the pipe after the pre-tightening operation begins, and calculate and record the end face position a of the oil well pipe 1 through the laser contour measuring instrument 7.

[0056] Third, after the pre-tightening operation is completed, the J-value measuring unit 10 collects the contour data of the coupling 2 and the oil well pipe 1 being screwed together by the laser profile measuring instrument 7. Combined with the end face position a of the oil well pipe 1, the length value L of the coupling 2 is calculated as 160mm, and the length value D1 of the coupling 2 being screwed into the oil well pipe 1 is calculated as 35mm.

[0057] The fourth step is to transport coupling 2 and oil well pipe 1 from the pre-tightening station to the dynamic tightening station after the pre-tightening operation is completed.

[0058] Fifth step: After the dynamic tightening operation begins, the J-value measuring unit 10 uses the laser travel measuring instrument 8 to measure the moving distance D2 = 32mm of the oil well pipe 1 during the entire dynamic tightening operation.

[0059] Step 6: After obtaining the length value L of coupling 2, the length value D1 of pre-tightening coupling 2 screwed into oil well pipe 1, and the length value D2 of dynamic tightening coupling 2 screwed into oil well pipe 1, the J value measuring unit 10 calculates the J value as 160 / 2-35-32=13mm according to the J value calculation method.

[0060] By following the steps above, the J-value of the oil well pipe coupling tightening can be measured online.

[0061] Example 2

[0062] The online measurement method flowchart for this embodiment is attached. Figure 1 As shown, it includes the following steps:

[0063] In the first step, the J-value measurement unit 10 reads the current diameter specifications of the coupling 2 and the well pipe 1 through the process signal interface unit 9, which are 80mm and 71mm respectively.

[0064] The second step is to collect the contour data of the oil well pipe 1 within a range of 200mm from the end of the pipe after the pre-tightening operation begins, and calculate and record the end face position a of the oil well pipe 1 through the laser contour measuring instrument 7.

[0065] Third, after the pre-tightening operation is completed, the J-value measuring unit 10 collects the contour data of the coupling 2 and the oil well pipe 1 being screwed together by the laser profile measuring instrument 7. Combined with the end face position a of the oil well pipe 1, the length value L of the coupling 2 is calculated as 125mm, and the length value D1 of the coupling 2 being screwed into the oil well pipe 1 is calculated as 25.3mm.

[0066] The fourth step is to transport coupling 2 and oil well pipe 1 from the pre-tightening station to the dynamic tightening station after the pre-tightening operation is completed.

[0067] Fifth step: After the dynamic tightening operation begins, the J-value measuring unit 10 uses the laser travel measuring instrument 8 to measure the moving distance D2 = 24.5 mm of the oil well pipe 1 during the entire dynamic tightening operation.

[0068] Step 6: After obtaining the length value L of coupling 2, the length value D1 of pre-tightening coupling 2 screwed into oil well pipe 1, and the length value D2 of dynamic tightening coupling 2 screwed into oil well pipe 1, the J value measuring unit 10 calculates the J value as 125 / 2-25.3-24.5=12.7mm according to the J value calculation method.

[0069] By following the steps above, the J-value of the oil well pipe coupling tightening can be measured online.

[0070] Those skilled in the art should recognize that the above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. Any variations or modifications to the above embodiments that are within the spirit and essence of the present invention will fall within the scope of the claims of the present invention.

Claims

1. An online measurement method for measuring the J-value of tightening between an oil well pipe and a coupling, characterized in that, Includes the following steps: S1. Obtain the current diameter dimensions of the coupling and well casing; S2. At the pre-tightening station, the end face position of the oil well pipe is acquired and obtained by a laser profile measuring instrument; S3. Then, the laser profile measuring instrument is used to collect and obtain the length value of the coupling and the length value of the coupling screwed into the oil well pipe; S4. Transport the coupling and the well pipe to the tightening station; S5. Measure and obtain the movement distance of the oil well pipe using a laser travel measuring instrument; The S6 J-value measuring unit calculates the J-value based on the diameter of the coupling and the well pipe, the data obtained by the laser profile measuring instrument, and the data obtained by the laser stroke measuring instrument.

2. The online measurement method for measuring the tightening J value between the oil well pipe and the coupling according to claim 1, characterized in that, Step S2 specifically includes: Before the pre-tightening begins, when the coupling has not yet contacted the well pipe, the contour data of the well pipe is measured by the laser contour measuring instrument, and the end face position a of the well pipe is calculated and recorded.

3. The online measurement method for measuring the tightening J value between the oil well pipe and the coupling according to claim 2, characterized in that, Step S3 specifically includes: After the pre-tightening is completed, the contour data of the coupling and the oil well pipe being screwed together is obtained by measuring the laser contour measuring instrument. The diameter of the coupling is larger than the diameter of the well pipe, and a step shape will appear on the outline. The position b of the step is calculated, which is the end face position of the coupling on the well pipe. Then the other end face position c of the coupling is calculated. Based on the three positions a, b, and c, the length value L of the coupling and the length value D1 of the coupling pre-screwed into the well pipe can be calculated.

4. The online measurement method for measuring the tightening J value between the oil well pipe and the coupling according to claim 3, characterized in that: In step S5, the laser travel measuring instrument measures and obtains the moving distance value of the oil well pipe, which is the length value D2 of the coupling being screwed into the oil well pipe during the screwing operation.

5. The online measurement method for measuring the tightening J value between the oil well pipe and the coupling according to claim 4, characterized in that: In step S6, the J value = L / 2 - D1 - D2.

6. An online measurement system for measuring the J-value of tightening between an oil well pipe and a coupling, characterized in that, include: A laser profile measuring instrument is installed above the coupling and the well pipe at the pre-tightening station to measure the profile data of the coupling and the well pipe. A laser travel measuring instrument is installed above the oil well pipe at the rotating station to measure the travel distance of the oil well pipe. A process signal interface unit is used to collect the diameter specification data of the coupling and the well pipe. The J-value measurement unit is used to receive contour data, travel distance value, and diameter specification data transmitted from the laser contour measuring instrument, the laser travel measuring instrument, and the process signal interface unit, and to calculate the J-value. The online measurement system for measuring the tightening J value between the oil well pipe and the coupling realizes the online measurement method for measuring the tightening J value between the oil well pipe and the coupling as described in any one of claims 1-5.

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