Method for testing and evaluating bending resistance and overall bearing capacity of hoisting pipe

Abstract

The invention discloses a method for testing and evaluating the bending resistance and overall bearing capacity of a hoisting pipe, which comprises the following steps of: mounting a loading device above a hoisting pipe to be detected of drilling equipment, connecting the hoisting pipe to the loading device through a pull rod and an annular lasso, fixing the pull rod on a loading oil cylinder of the loading device through a locking nut, and loading the hoisting pipe on the loading oil cylinder; then the annular lasso is adjusted to a preset position, the hoisting pipe is loaded through a hydraulic system, stress data of the hoisting pipe is monitored and collected through a strain gauge in the middle of the hoisting pipe in the loading process, finally, a measurement result is evaluated through an evaluation method, and the bending resistance and the overall bearing capacity of the hoisting pipe are judged according to the evaluation result. The problems that an existing hoisting pipe loading test method is low in detection efficiency, the counterweight selection and placement are tedious, the loading error is large, and the hoisting pipes which cannot be subjected to pairwise loading test on large-span or large and heavy parts with obstacles in the middle on drilling equipment are tested, evaluated and automatically loaded are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil field oil production, and in particular relates to a method for testing and evaluating the bending resistance and overall bearing capacity of a hoisting pipe. Background Art

[0002] With the development of oil drilling technology, special super-large and super-heavy drilling equipment continues to emerge (especially deep-sea drilling equipment), among which the lifting weight of a single piece of equipment is between 80-200 tons, and most of the lifting devices configured on the drilling equipment are lifting pipes; as an important component in the equipment transportation and equipment installation process, the lifting pipe is mainly composed of support pipes, rib plates, cover plates, etc., usually distributed on the side of the equipment, and bears the entire weight of the hoisted equipment during use, which is closely related to the life and property safety of operators during production and installation; therefore, before the use of drilling equipment, the lifting pipe used for lifting must be tested for bending resistance and overall load-bearing capacity.

[0003] The main forms of damage to the lifting pipe are flattening of the pipe body, overall bending, and tearing of the root and surrounding welds; currently, the lifting pipe can only be loaded by the following two methods: 1) After determining the test load value according to the design capacity of the lifting pipe, select a suitable counterweight and place it on the test component, and then use the lifting equipment to lift the wire rope connected to the lifting lug to load the lifting lug. This method requires selecting and placing the counterweight each time, which is a heavy workload for the test personnel. In addition, the detection method is inefficient, has large loading errors, and the selection and placement of counterweights are cumbersome, with high safety risks, and cannot be automated, which greatly increases the labor intensity of the operator. 2) Paired loading is performed on the lifting lugs and lifting pipes with uniform position distribution through paired loading devices; this method can only be applied to conventional structural equipment for testing. If there are large spans or obstacles such as large supports and shells between two lifting pipes, paired loading tests cannot be performed. In addition to having obvious disadvantages, the above two methods only detect the overall load-bearing capacity of the hanging pipe by simple loading and flaw detection of the weld after loading, and cannot scientifically and rigorously evaluate and analyze the test results; therefore, there is an urgent need for a method for detecting and evaluating the bending resistance and overall load-bearing capacity of the hanging pipe with high detection efficiency, accurate loading, safety, convenient operation, and scientific and rigorous evaluation, as well as a matching loading device; improve the loading efficiency and test safety of the hanging pipe on the oil drilling equipment (especially large span and large equipment), reduce the labor intensity of the on-site workers, and scientifically and rigorously evaluate the bending resistance and overall load-bearing capacity of the hanging pipe. Summary of the invention

[0004] The purpose of the present invention is to provide a method specifically for testing the bending resistance and overall load-bearing capacity of hanging pipes on drilling equipment and for post-test evaluation of the test data. By using this method, the extended length of the hanging pipes on the drilling equipment, whether the supporting position of the rib plate is reasonable, the bending resistance and the overall load-bearing capacity are checked; and by using the loading device relied on by the method, the problems of low detection efficiency, cumbersome selection and placement of counterweights, large loading errors, and the inability to perform paired loading tests on hanging pipes on large and heavy components of drilling equipment with large spans or obstacles in the middle are solved, and evaluation and automated loading operations are implemented.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is: a method for testing and evaluating the bending resistance and overall bearing capacity of a lifting pipe, using a loading test device for a lifting pipe on drilling equipment, which includes a loading device, which is installed above the lifting pipe to be tested on the drilling equipment, and the lifting pipe is connected to the loading device through a pull rod and an annular lasso, and the pull rod is fixed to the loading cylinder of the loading device through a locking nut, and then the annular lasso is adjusted to a predetermined position, and the lifting pipe is loaded through a hydraulic system. During the loading process, the strain gauge in the middle of the lifting pipe is used to monitor and collect the stress data of the lifting pipe, and finally the measurement results are evaluated through an evaluation method, and the bending resistance and overall bearing capacity of the lifting pipe are determined according to the evaluation results.

[0006] As a preferred technical solution of the present invention, the loading device includes a loading device base, a loading cylinder located on the loading device base, and a loading cylinder located on the loading cylinder.

[0007] As a preferred technical solution of the present invention, there are four strain gauges in the middle of the hanging pipe, and they are arranged circumferentially at equal angles.

[0008] As a preferred technical solution of the present invention, the pull rod is fixed to the top of the loading cylinder by a locking nut.

[0009] As a preferred technical solution of the present invention, it is implemented specifically according to the following steps:

[0010] Step 1: Place the drilling equipment parts to be tested steadily on the workbench in the workshop, adjust the position and spacing of the pressing pad and bolts at the bottom of the loading device base according to the position of the lifting pipe, and then install the loading device base on the equipment plane just above the tested lifting pipe of the large-span drilling equipment, and fix it firmly with the pressing pad and bolts;

[0011] Step 2: Place the loading tube and loading cylinder of the loading device at appropriate positions on the base of the loading device; the upper part of the pull rod passes through the hole in the middle of the base of the loading device and the loading cylinder upward to the top of the loading cylinder, and is temporarily fixed with a locking nut;

[0012] Step 3: Attach strain gauges I, II, III and IV to the four directions of the lifting pipe body at a position a centimeters away from the outer end faces of the longitudinal ribs and transverse ribs of the lifting pipe, and then connect the strain gauge cables to the integrated control system through stress acquisition cables;

[0013] Step 4: Hang the annular lasso on the hoisting pipe, and connect the upper part of the annular lasso to the lower part of the pull rod through the pin to form a whole; connect the upper end of the diagonal support rod to the base of the loading device, and support the lower end on the long-span drilling equipment, and adjust the length of the diagonal support rod to make the base of the loading device and the surface of the long-span drilling equipment in flat contact; turn the locking nut to make the pull rod and the annular lasso in a tensioned state as a whole;

[0014] Step 5: Connect the loading hydraulic pipeline from the loading cylinder to the integrated control system; after setting the test load, loading time, stable load time, data acquisition, etc. through the integrated control system, the loading of the lifting pipe can be started; after the loading is completed, a standardized test report containing the loading curve and measuring point data is output;

[0015] Step 6: Based on the stress data of the measuring points obtained by loading, the stress on the lifting pipe body is synthesized by the following formula:

[0016]

[0017]

[0018]

[0019] Where:

[0020] f a —The absolute value of the axial tensile or compressive stress of the lifting pipe body when the lifting pipe is subjected to the maximum rated load of the design, MPa;

[0021] f bx —Bending compressive stress of the lifting pipe body around the x-axis direction when the lifting pipe is subjected to the maximum rated load of the design, MPa;

[0022] f by —Bending compressive stress of the lifting pipe body around the y-axis direction when the lifting pipe is subjected to the maximum rated load of the design, MPa;

[0023] σ 19 , σ 20 , σ 21 , σ 22 —Represents the stress values ​​measured by strain gauge I, strain gauge II, strain gauge III, and strain gauge IV, MPa;

[0024] Step 7: Place the f a 、f bx、f by Compared with the allowable stress of the lifting pipe body material, the total stress f a Under the premise of not exceeding the allowable stress of the lifting pipe body material, f bx 、f by , σ 19 , σ 20 , σ 21 , σ 22 Any item in the above shall not exceed the allowable stress of the hanging pipe body material, so as to achieve the purpose of determining the bending resistance and overall bearing capacity of the hanging pipe on the drilling equipment;

[0025] Step 8: If the measured or calculated f a 、f bx 、f by , σ 19 , σ 20 , σ 21 , σ 22 If any one or more of the values ​​exceed the allowable stress value of the lifting pipe body material, it is necessary to optimize the material of the lifting pipe body, or adjust the size of the longitudinal ribs and transverse ribs of the lifting pipe to optimize the lifting pipe design.

[0026] The beneficial effects of the present invention are as follows: (1) The present invention provides a test device for the bending resistance and overall bearing capacity test of the hanging pipe on the drilling equipment, which is automated, remotely controlled, easy to operate, accurate in loading, comprehensive in monitoring, and highly efficient in testing. (2) The present invention provides an evaluation method for the test results of the bending resistance and overall bearing capacity of the hanging pipe on the drilling equipment, so as to judge whether the design of the hanging pipe and its surrounding ribs, welds, etc. is safe and reasonable, which is helpful for designers to evaluate the safety of the use of the hanging pipe and optimize the design. (3) The test device of the present invention adopts a hydraulic loading method, which can realize remote control and automation of equipment operation while loading steadily and accurately, greatly improving the safety of the test process. (4) The loading device of the present invention has a wide range of applications and strong compatibility. It is not only suitable for the testing and evaluation of the bending resistance and overall bearing capacity of the hanging pipe on special super-large and super-heavy drilling equipment, but also can be used for the loading test of the hanging pipe and lifting lugs on the components of conventional drilling equipment. In addition, the automated loading process greatly improves the detection efficiency at the production site and reduces the labor intensity of the operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a side view of a method for testing and evaluating the bending resistance and overall bearing capacity of a hoisting pipe according to the present invention used on a large-span drilling device;

[0028] Figure 2 This is a front view of a method for testing and evaluating the bending resistance and overall bearing capacity of a hoisting pipe according to the present invention used on a large-span drilling device;

[0029] Figure 3 is a side view of a loading device used in the present invention;

[0030] Figure 4 is a front view of the loading device used in the present invention;

[0031] Figure 5 It is a top view of the hanging pipe;

[0032] Figure 6 It is a side view of the hanging pipe;

[0033] Figure 7 This is the arrangement diagram of the strain gauges on the lifting pipe.

[0034] In the figure: 1. loading device, 2. diagonal support rod, 3. annular lasso, 4. integrated control system, 5. loading hydraulic pipeline, 6. stress collection cable, 7. pull rod pin assembly, 8. large span drilling equipment, 9. lifting pipe, 10. loading device base, 11. loading tube, 12. loading cylinder, 13. locking nut, 14. clamping pad and bolt, 15. lifting pipe cover plate, 16. lifting pipe longitudinal rib plate, 17. lifting pipe body, 18. lifting pipe transverse rib plate, 19. strain gauge I, 20. strain gauge II, 21. strain gauge III, 22. strain gauge IV. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings, tables and specific embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] The present invention is further described below by way of examples, but is not limited to the following embodiments.

[0037] Example 1

[0038] like Figures 1 to 4 As shown, a method for testing and evaluating the bending resistance and overall bearing capacity of a lifting pipe of the present invention is based on the principle of utilizing a lifting pipe loading test device on drilling equipment, which comprises a loading device 1, wherein the loading device 1 is installed above a lifting pipe 9 to be tested of the drilling equipment, and the lifting pipe 9 is connected to the loading device 1 through a pull rod 7 and an annular lasso 3, and the pull rod 7 is fixed to a loading cylinder 12 of the loading device 1 through a locking nut 13, and then the annular lasso 3 is adjusted to a predetermined position, and the lifting pipe 9 is loaded through a hydraulic system, and during the loading process, the stress data of the lifting pipe is monitored and collected through a strain gauge in the middle of the lifting pipe 9, and finally the measurement result is evaluated through an evaluation method, and the bending resistance and overall bearing capacity of the lifting pipe are determined according to the evaluation result.

[0039] Example 2

[0040] The loading test device in the method of the present invention is specially designed for testing the bending resistance and overall bearing capacity of the hanging pipe 9 configured on the drilling equipment, which includes a loading device 1. The loading device base 10 of the loading device 1 is stably placed on the upper surface just above the tested hanging pipe 9 of the large-span drilling equipment 8 to be tested, and the clamping pad and bolts 14 on the loading device base 10 are adjusted, and the clamping pad and the wing plate of the large-span drilling equipment 8 are clamped by bolts; the loading tube 11 and the loading cylinder 12 of the loading device 1 are placed at appropriate positions on the loading device base 10; the upper pull rod of the pull rod 7 passes through the hole in the middle of the loading device base 10 and the loading cylinder 12 to the top of the loading cylinder 12, and is temporarily fixed with a locking nut 13; refer to Figure 7 Strain gauges I 19, II 20, III 21 and IV 22 are respectively attached to the four directions of the hoisting pipe body 17, and then the strain gauge cables are connected to the integrated control system 4 through the stress acquisition cable 6; the annular lasso 3 is hung on the hoisting pipe 9, and the upper part of the annular lasso 3 is connected to the lower part of the pull rod 7 through the pin shaft to form a whole; the upper end of the diagonal support rod 2 is connected to the loading device base 10, and the lower end is supported on the long-span drilling equipment 8, and the loading device base 10 is in flat contact with the surface of the long-span drilling equipment 8 by adjusting the length of the diagonal support rod 2; the locking nut 13 is turned to make the pull rod 7 and the annular lasso 3 as a whole in a tensioned state; the loading hydraulic pipeline 5 is connected from the loading cylinder 12 to the integrated control system 4; the loading of the hoisting pipe can be started after the test load, loading time, stable load time, data acquisition and other aspects are set through the integrated control system 4; the stress data at each point on the hoisting pipe is tested by loading, and the bending resistance and overall bearing capacity of the hoisting pipe are calculated and evaluated according to rigorous mathematical formulas. The calculation results and loading curves are directly attached to the back of the test report of each tested lifting pipe, which is convenient for designers to query the condition of the lifting pipe and provide a real and reliable test data basis for optimizing the design; at the same time, it is also convenient for users of drilling equipment to provide protection for their safety.

[0041] Example 3

[0042] Combination Figures 5 to 7 The method for testing and evaluating the bending resistance and overall load-bearing capacity of the hoisting pipe of the present invention is specifically implemented according to the following steps:

[0043] Step 1: Place the drilling equipment component to be tested steadily on the workshop workbench, adjust the position and spacing of the pressing pad and bolts 14 at the bottom of the loading device base 10 according to the position of the hanging pipe, and then install the loading device base 10 on the equipment plane just above the tested hanging pipe 9 of the long-span drilling equipment 8, and fix it firmly by pressing the pad and bolts 14;

[0044] Step 2: Place the loading tube 11 and the loading cylinder 12 of the loading device 1 at appropriate positions on the loading device base 10; the upper part of the pull rod 7 passes through the hole in the middle of the loading device base 10 and the loading cylinder 12 upward to the top of the loading cylinder 12, and is temporarily fixed with a locking nut 13;

[0045] Step 3: Reference Figure 7 , respectively attach the strain gauges I 19, II 20, III 21, and IV 22 to the four directions of the hoisting pipe body 17 at a position a centimeters away from the outer end faces of the longitudinal ribs 16 and the transverse ribs 18 of the hoisting pipe, and then connect the cables of the strain gauges to the integrated control system 4 through the stress acquisition cable 6;

[0046] Step 4: Hang the annular lasso 3 on the hoisting pipe 9, and connect the upper part of the annular lasso 3 to the lower part of the pull rod 7 through the pin shaft to form a whole; connect the upper end of the diagonal support rod 2 to the loading device base 10, and support the lower end on the long-span drilling equipment 8, and adjust the length of the diagonal support rod 2 to make the loading device base 10 and the surface of the long-span drilling equipment 8 in flat contact; turn the locking nut 13 to make the pull rod 7 and the annular lasso 3 in a tensioned state as a whole;

[0047] Step 5: Connect the loading hydraulic pipeline 5 from the loading cylinder 12 to the integrated control system 4; after setting the test load, loading time, stable load time, and data acquisition through the integrated control system 4, the loading of the lifting pipe can be started; after the loading is completed, a standardized test report containing the loading curve and measuring point data is output;

[0048] Step 6: Based on the stress data of the measuring points obtained by loading, the stress on the lifting pipe body is synthesized by the following formula:

[0049]

[0050]

[0051]

[0052] Where:

[0053] f a —The absolute value of the axial tensile or compressive stress of the lifting pipe body when the lifting pipe is subjected to the maximum rated load of the design, MPa;

[0054] f bx —Bending compressive stress of the lifting pipe body around the x-axis direction when the lifting pipe is subjected to the maximum rated load of the design, MPa;

[0055] f by —Bending compressive stress of the lifting pipe body around the y-axis direction when the lifting pipe is subjected to the maximum rated load of the design, MPa;

[0056] σ 19 , σ 20 , σ 21 , σ 22 —represents the stress values ​​measured by strain gauge I19, strain gauge II20, strain gauge III21, and strain gauge IV22, respectively, in MPa;

[0057] Step 7: Place the f a 、f bx 、f by Compared with the allowable stress of the lifting pipe body material, the total stress f a Under the premise of not exceeding the allowable stress of the lifting pipe body material, f bx 、f by , σ 19 , σ 20 , σ 21 , σ 22 Any item in the above shall not exceed the allowable stress of the hanging pipe body material, so as to achieve the purpose of determining the bending resistance and overall bearing capacity of the hanging pipe on the drilling equipment;

[0058] Step 8: If the measured or calculated f a 、F bx 、F by , σ 19 , σ 20 , σ 21 , σ 22 If any one or more of the values ​​exceed the allowable stress value of the lifting pipe body material, it is necessary to optimize the material of the lifting pipe body 17, or adjust the size of the lifting pipe longitudinal rib 16 and the lifting pipe transverse rib 18 to optimize the lifting pipe design.

[0059] Therefore, the method for testing and evaluating the bending resistance and overall bearing capacity of a lifting pipe of the present invention can truly simulate the stress conditions of the lifting pipe body and the surrounding ribs, welds, etc. in actual working conditions for the lifting pipes on drilling equipment with large spans or obstacles in the middle, while greatly improving the efficiency and operational safety of the lifting pipe inspection work, and making the inspection data more real and accurate, providing more valuable reference inspection data for the material optimization, structural optimization, and reasonable layout of the lifting pipes configured on large and heavy components of the drilling equipment.

Claims

1. Testing and evaluation method for bending resistance and overall bearing capacity of hoisting pipe, characterized in that: A loading test device for a hanging pipe on drilling equipment is used, which comprises a loading device (1). The loading device (1) is installed above a hanging pipe (9) to be tested on the drilling equipment. The hanging pipe (9) is connected to the loading device (1) via a pull rod (7) and an annular lasso (3). The pull rod (7) is fixed to a loading cylinder (12) of the loading device (1) via a locking nut (13). The annular lasso (3) is then adjusted to a predetermined position. The hanging pipe (9) is loaded via a hydraulic system. During the loading process, the stress data of the hanging pipe is monitored and collected via a strain gauge in the middle of the hanging pipe (9). Finally, the measurement result is evaluated via an evaluation method. The bending resistance and overall load-bearing capacity of the hanging pipe are determined based on the evaluation result.

2. The method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe according to claim 1 is characterized in that: The loading device (1) comprises a loading device base (10), a loading cylinder (11) located on the loading device base (10), and a loading oil cylinder (12) located in the loading cylinder (11).

3. The method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe according to claim 2 is characterized in that: There are four strain gauges in the middle of the hanging pipe (9), which are arranged circumferentially at equal angles.

4. The method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe according to claim 3 is characterized in that: The pull rod (9) and the top of the loading cylinder (12) are fixed by a locking nut (13).

5. The method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe according to claim 4 is characterized in that: Follow the steps below to implement it: Step 1: Place the drilling equipment component to be tested steadily on a workshop workbench, adjust the position and spacing of the pressing pad and bolts (14) at the bottom of the loading device base (10) according to the position of the hanging pipe, and then install the loading device base (10) on the equipment plane directly above the hanging pipe (9) to be tested of the long-span drilling equipment (8), and fix it firmly by pressing the pad and bolts (14); Step 2: Place the loading tube (11) and the loading cylinder (12) of the loading device (1) at appropriate positions on the loading device base (10); the upper part of the pull rod (7) passes through the hole in the middle of the loading device base (10) and the loading cylinder (12) upward to the top of the loading cylinder (12), and is temporarily fixed with a locking nut (13); Step 3: Strain gauges I (19), II (20), III (21), and IV (22) are respectively attached to the four directions of the hanging pipe body (17) at positions a centimeters away from the outer end surfaces of the hanging pipe longitudinal ribs (16) and the hanging pipe transverse ribs (18), and then the cables of the strain gauges are connected to the integrated control system (4) through the stress acquisition cables (6); Step 4: Hang the annular lasso (3) on the hoisting pipe (9), and connect the upper part of the annular lasso (3) to the lower part of the pull rod (7) through a pin shaft to form a whole; connect the upper end of the diagonal support rod (2) to the base of the loading device (10), and support the lower end on the long-span drilling equipment (8), and adjust the length of the diagonal support rod (2) to make the base of the loading device (10) and the surface of the long-span drilling equipment (8) in smooth contact; turn the locking nut (13) to make the pull rod (7) and the annular lasso (3) in a tensioned state as a whole; Step 5: Connect the loading hydraulic pipeline (5) from the loading cylinder (12) to the integrated control system (4); after setting the test load, loading time, load stabilization time, data collection, etc. through the integrated control system (4), the loading of the lifting pipe can be started; after the loading is completed, a standardized test report including the loading curve and the measuring point data is output; Step 6: Based on the stress data of the measuring points obtained by loading, the stress on the lifting pipe body is synthesized by the following formula: Where: f a —The absolute value of the axial tensile or compressive stress of the lifting pipe body when the lifting pipe is subjected to the maximum rated load of the design, MPa; f bx —Bending compressive stress of the lifting pipe body around the x-axis direction when the lifting pipe is subjected to the maximum rated load of the design, MPa; f by —Bending compressive stress of the lifting pipe body around the y-axis direction when the lifting pipe is subjected to the maximum rated load of the design, MPa; σ 19 , σ 20 , σ 21 , σ 22 —represents the stress values ​​measured by strain gauge I (19), strain gauge II (20), strain gauge III (21), and strain gauge IV (22), respectively, in MPa; Step 7: Place the f a 、f bx 、f by Compared with the allowable stress of the lifting pipe body material, the total stress f a Under the premise of not exceeding the allowable stress of the lifting pipe body material, f bx 、f by , σ 19 , σ 20 , σ 21 , σ 22 Any item in the above shall not exceed the allowable stress of the hanging pipe body material, so as to achieve the purpose of determining the bending resistance and overall bearing capacity of the hanging pipe on the drilling equipment; Step 8: If the measured or calculated f a 、F bx 、F by , σ 19 , σ 20 , σ 21 , σ 22 If any one or more of the values ​​exceed the allowable stress value of the lifting pipe body material, it is necessary to optimize the material of the lifting pipe body (17), or adjust the size of the lifting pipe longitudinal ribs (16) and the lifting pipe transverse ribs (18), so as to optimize the design of the lifting pipe 9.

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