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

Abstract

The application discloses a hoisting pipe bending resistance and overall bearing capacity testing and evaluation method, installs a loading device above a hoisting pipe of drilling equipment to be detected, connects the hoisting pipe to the loading device through a pull rod and a ring noose, fixes the pull rod on a loading cylinder of the loading device through a locking nut, then adjusts the ring noose to a predetermined position, loads the hoisting pipe through a hydraulic system, monitors and collects stress data of the hoisting pipe through strain gauges in the middle of the hoisting pipe during the loading process, finally evaluates the measurement results through an evaluation method, and determines the bending resistance and overall bearing capacity of the hoisting pipe according to the evaluation results. The application overcomes the problems of low detection efficiency, complicated counterweight selection and placement, large loading error, and inability to test, evaluate and realize automatic loading operation for hoisting pipes of large-span or middle-obstacle large and heavy components on drilling equipment through the existing hoisting pipe loading test method.

Description

Technical Field

[0001] This invention belongs to the field of oilfield oil production technology, specifically relating to a method for testing and evaluating the bending resistance and overall load-bearing capacity of hoisting pipes. Background Technology

[0002] With the development of oil drilling technology, special ultra-large and ultra-heavy drilling equipment is constantly emerging (especially deep-sea drilling equipment). The lifting weight of a single piece of equipment ranges from 80 to 200 tons. Most of the lifting devices on drilling equipment are lifting pipes. As an important component in the equipment transfer and installation process, the lifting pipe is mainly composed of support pipes, stiffening plates, and cover plates. It is usually located on the side of the equipment and bears the entire weight of the equipment being lifted. It is closely related to the life and property safety of the operators during production and installation. Therefore, before using drilling equipment, the lifting pipe used for lifting operations must be tested for bending resistance and overall load-bearing capacity.

[0003] The main failure modes of suspended pipes are pipe flattening, overall bending, and tearing of the root and surrounding welds. Currently, only two methods can be used to load suspended pipes: 1) After determining the test load value based on the design capacity of the suspended pipe, select appropriate counterweights and place them on the test component. Then, use lifting equipment to lift the wire rope connected to the lifting lugs to load the lugs. This method requires selecting and placing counterweights each time, which is labor-intensive for test personnel. Furthermore, this testing method is inefficient, has large loading errors, is cumbersome in selecting and placing counterweights, poses significant safety risks, cannot be automated, and greatly increases the labor intensity of operators. 2) Use paired loading devices to load evenly distributed lifting lugs and suspended pipes in pairs. This method is only suitable for testing conventional structural equipment. If there is a large span or obstacles such as large supports or shells between the two suspended pipes, paired loading tests cannot be performed. Besides their obvious drawbacks, the above two methods only test the overall load-bearing capacity of the suspended pipe through simple loading and subsequent weld inspection, failing to provide a scientific and rigorous evaluation and analysis of the test results. Therefore, there is an urgent need for a method for testing and evaluating the bending resistance and overall load-bearing capacity of suspended pipes that is efficient, accurate, safe, easy to operate, and scientifically rigorous, along with a matching loading device. This would improve the loading efficiency and testing safety of suspended pipes on oil drilling equipment (especially large-span, large-scale equipment), reduce the labor intensity of on-site workers, and provide a scientific and rigorous evaluation of the bending resistance and overall load-bearing capacity of the suspended pipes. Summary of the Invention

[0004] The purpose of this invention is to provide a method specifically for testing the bending resistance and overall load-bearing capacity of lifting pipes on drilling equipment, and for evaluating the test data after testing. This method examines the extension length, the rationality of the stiffener support position, the bending resistance, and the overall load-bearing capacity of the lifting pipes on drilling equipment. Furthermore, the loading device upon which this method relies solves the problems of low testing efficiency, cumbersome counterweight selection and placement, large loading errors, and the inability to test, evaluate, and automate the loading operation of lifting pipes on large and heavy components of drilling equipment with large spans or obstacles in between.

[0005] To achieve the above objectives, the technical solution adopted in this invention is: a method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe. This method utilizes a hoisting pipe loading test device on drilling equipment, comprising a loading device installed above the hoisting pipe to be tested on the drilling equipment. The hoisting pipe is connected to the loading device via a tie rod and a ring-shaped sling. The tie rod is fixed to the loading cylinder of the loading device by a locking nut. Then, the ring-shaped sling is adjusted to a predetermined position, and the hoisting pipe is loaded via a hydraulic system. During the loading process, strain gauges in the middle of the hoisting pipe are used to monitor and collect stress data. Finally, the measurement results are evaluated using an evaluation method, and the bending resistance and overall load-bearing capacity of the hoisting pipe are determined based on 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 embodiment of the present invention, there are four strain gauges in the middle of the hoisting tube, which are arranged circumferentially at equal angles.

[0008] As a preferred embodiment 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 according to the following steps:

[0010] Step 1: Place the drilling equipment components to be tested stably on the workshop workbench. Adjust the position and spacing of the clamping pads and bolts at the bottom of the loading device base according to the position of the lifting pipe. Then install the loading device base on the equipment plane directly above the lifting pipe of the large-span drilling equipment and fix it firmly with clamping pads and bolts.

[0011] Step 2: Place the loading cylinder and loading cylinder of the loading device into a suitable position 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 to the top of the loading cylinder, and is temporarily fixed with a lock nut;

[0012] Step 3: Place strain gauge I, strain gauge II, strain gauge III, and strain gauge IV at positions a cm away from the outer end face of the longitudinal stiffener and transverse stiffener of the lifting pipe in four directions on the pipe body. Then connect the strain gauge cables to the integrated control system through stress acquisition cables.

[0013] Step 4: Suspend the ring sling onto the lifting pipe. The upper part of the ring sling is connected to the lower part of the tie rod through a pin to form a whole. Connect the upper end of the diagonal brace to the base of the loading device and support the lower end on the large-span drilling equipment. Adjust the length of the diagonal brace to make the base of the loading device in flat contact with the surface of the large-span drilling equipment. Turn the locking nut to make the tie rod and the ring sling in a tensioned state.

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

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

[0016]

[0017]

[0018]

[0019] In the formula:

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

[0021] f bx —The bending compressive stress (MPa) of the lifting pipe body about the x-axis when the lifting pipe is subjected to the maximum rated load of the design;

[0022] f by —The bending compressive stress (MPa) of the lifting pipe body about the y-axis when the lifting pipe is subjected to the maximum rated load of the design;

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

[0024] Step 7: f a f bxf by Compare the stresses with the allowable stresses of the lifting pipe material, respectively, at a total stress f a Provided that the stress does not exceed the allowable stress of the lifting pipe material, f bx f by σ 19 σ 20 σ 21 σ 22 None of these parameters can exceed the allowable stress of the lifting pipe material, thus achieving the purpose of determining the bending resistance and overall load-bearing capacity of the lifting 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 values ​​exceed the allowable stress value of the lifting pipe material, then it is necessary to optimize the material of the lifting pipe or adjust the size of the longitudinal stiffeners and transverse stiffeners of the lifting pipe to optimize the lifting pipe design.

[0026] The beneficial effects of the present invention are: (1) The present invention provides an automated, remotely controlled, easy-to-operate, accurately loaded, comprehensively monitored, and highly efficient testing device for testing the bending resistance and overall load-bearing capacity of the lifting pipe on drilling equipment. (2) The present invention provides an evaluation method for the test results of the bending resistance and overall load-bearing capacity of the lifting pipe on drilling equipment, thereby judging whether the design of the lifting pipe and its surrounding stiffeners, welds, etc. is safe and reasonable, which is beneficial for designers to evaluate and optimize the safety of the lifting pipe. (3) The test device of the present invention adopts a hydraulic loading method, which realizes remote control and automation of equipment operation while loading smoothly 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 testing and evaluating the bending resistance and overall load-bearing capacity of the lifting pipe on special ultra-large and ultra-heavy drilling equipment, but also for loading tests of the lifting pipe and lifting lugs on conventional drilling equipment components. Moreover, the automated loading process greatly improves the testing efficiency on the production site and reduces the labor intensity of operators. Attached Figure Description

[0027] Figure 1 This is a side view of a method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe, as described in this invention, used on a long-span drilling rig.

[0028] Figure 2 This is a front view of a method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe, as described in this invention, used on a long-span drilling rig.

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

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

[0031] Figure 5 This is a top view of the lifting pipe;

[0032] Figure 6 This is a side view of the lifting pipe;

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

[0034] In the diagram: 1. Loading device, 2. Diagonal brace, 3. Circular lasso, 4. Integrated control system, 5. Loading hydraulic pipeline, 6. Stress acquisition cable, 7. Tie rod pin assembly, 8. Large span drilling equipment, 9. Lifting pipe, 10. Loading device base, 11. Loading cylinder, 12. Loading cylinder, 13. Locking nut, 14. Pressure pad and bolt, 15. Lifting pipe cover plate, 16. Lifting pipe longitudinal stiffener, 17. Lifting pipe body, 18. Lifting pipe transverse stiffener, 19. Strain gauge I, 20. Strain gauge II, 21. Strain gauge III, 22. Strain gauge IV. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

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

[0037] Example 1

[0038] like Figures 1 to 4 As shown, the present invention discloses a method for testing and evaluating the bending resistance and overall load-bearing capacity of a hoisting pipe. The principle involves using a hoisting pipe loading test device on drilling equipment, comprising a loading device 1. The loading device 1 is installed above the hoisting pipe 9 to be tested on the drilling equipment. The hoisting pipe 9 is connected to the loading device 1 via a tie rod 7 and an annular sling 3. The tie rod 7 is fixed to the loading cylinder 12 of the loading device 1 by a locking nut 13. Then, the annular sling 3 is adjusted to a predetermined position, and the hoisting pipe 9 is loaded via a hydraulic system. During the loading process, strain gauges in the middle of the hoisting pipe 9 are used to monitor and collect stress data. Finally, the measurement results are evaluated using an evaluation method, and the bending resistance and overall load-bearing capacity of the hoisting pipe are determined based on the evaluation results.

[0039] Example 2

[0040] The loading test device in this invention, specifically designed for testing the bending resistance and overall load-bearing capacity of the lifting pipe 9 configured on drilling equipment, includes a loading device 1. The loading device base 10 of the loading device 1 is stably placed on the upper surface directly above the lifting pipe 9 of the large-span drilling equipment 8 to be tested. The clamping pad and bolts 14 on the loading device base 10 are adjusted, and the clamping pad is pressed tightly against the wing plate of the large-span drilling equipment 8 using bolts. The loading cylinder 11 and loading cylinder 12 of the loading device 1 are placed in suitable positions on the loading device base 10. The upper tie rod of the tie rod 7 passes through the hole in the middle of the loading device base 10 and through 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 I19, II20, III21, and IV22 are attached to the four directions of the lifting pipe body 17, and the strain gauge cables are connected to the integrated control system 4 via stress acquisition cable 6. The annular sling 3 is suspended from the lifting pipe 9, and the upper part of the annular sling 3 is connected to the lower part of the tie rod 7 as a whole via a pin. The upper end of the diagonal brace 2 is connected to the loading device base 10, and the lower end is supported on the large-span drilling equipment 8. The length of the diagonal brace 2 is adjusted to make the loading device base 10 and the surface of the large-span drilling equipment 8 make flat contact. The locking nut 13 is rotated to make the tie rod 7 and the annular sling 3 be in a tensioned state. The loading hydraulic line 5 is connected from the loading cylinder 12 to the integrated control system 4. After setting the test load, loading time, stabilization time, data acquisition, etc. through the integrated control system 4, the loading of the lifting pipe can begin. The stress data at each point on the lifting pipe is obtained through loading test, and the bending resistance and overall bearing capacity of the lifting pipe are calculated and evaluated according to rigorous mathematical formulas. The calculation results and loading curves are directly attached to the test report of each tested lifting pipe, making it easy for designers to check the condition of the lifting pipe and providing a reliable test data basis for design optimization; it also ensures the safety of drilling equipment users.

[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 implemented according to the following steps:

[0043] Step 1: Place the drilling equipment components to be tested stably on the workshop workbench. Adjust the position and spacing of the lower clamping pad and bolt 14 of the loading device base 10 according to the position of the lifting pipe. Then install the loading device base 10 onto the equipment plane directly above the lifting pipe 9 of the large span drilling equipment 8 and fix it firmly with the clamping pad and bolt 14.

[0044] Step 2: Place the loading cylinder 11 and loading cylinder 12 of the loading device 1 into a suitable position 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 to the top of the loading cylinder 12, and is temporarily fixed with the lock nut 13.

[0045] Step 3: Refer to Figure 7 Strain gauges I19, II20, III21, and IV22 are attached to the four directions of the lifting pipe body 17 at a distance of a centimeters from the outer end face of the longitudinal stiffener 16 and the transverse stiffener 18 of the lifting pipe. Then, the strain gauge cables are connected to the integrated control system 4 through the stress acquisition cable 6.

[0046] Step 4: Suspend the annular sling 3 onto the lifting pipe 9. The upper part of the annular sling 3 is connected to the lower part of the tie rod 7 as a whole through a pin. Connect the upper end of the diagonal brace 2 to the loading device base 10 and support the lower end on the large-span drilling equipment 8. Adjust the length of the diagonal brace 2 to make the loading device base 10 and the surface of the large-span drilling equipment 8 make flat contact. Rotate the locking nut 13 to make the tie rod 7 and the annular sling 3 be in a tensioned state.

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

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

[0049]

[0050]

[0051]

[0052] In the formula:

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

[0054] f bx —The bending compressive stress (MPa) of the lifting pipe body about the x-axis when the lifting pipe is subjected to the maximum rated load of the design;

[0055] f by —The bending compressive stress (MPa) of the lifting pipe body about the y-axis when the lifting pipe is subjected to the maximum rated load of the design;

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

[0057] Step 7: f a f bx f by Compare the stresses with the allowable stresses of the lifting pipe material, respectively, at a total stress f a Provided that the stress does not exceed the allowable stress of the lifting pipe material, f bx f by σ 19 σ 20 σ 21 σ 22 None of these parameters can exceed the allowable stress of the lifting pipe material, thus achieving the purpose of determining the bending resistance and overall load-bearing capacity of the lifting 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 values ​​exceed the allowable stress value of the lifting pipe body material, then it is necessary to optimize the material of the lifting pipe body 17, or adjust the dimensions of the longitudinal stiffener 16 and the transverse stiffener 18 of the lifting pipe, so as to optimize the design of the lifting pipe.

[0059] Therefore, the method for testing and evaluating the bending resistance and overall load-bearing capacity of lifting pipes in this invention can realistically simulate the stress conditions of the lifting pipe body and its surrounding stiffeners, welds, etc., under actual working conditions for lifting pipes on drilling equipment with large spans or obstacles in the middle. At the same time, it greatly improves the efficiency and operational safety of lifting pipe testing, and makes the test data more realistic and accurate. It provides more valuable test data for the material selection, structural optimization, and reasonable arrangement of lifting pipes configured on large and heavy components of drilling equipment.

Claims

1. A method for testing and evaluating the bending resistance and overall load carrying capacity of a hoisting pipe, characterized in that, The utility model relates to a kind of hoisting pipe loading test device on a large span drilling equipment, which includes loading device (1), the loading device (1) includes loading device base (10), loading cylinder (11) on loading device base (10) and loading oil cylinder (12) in loading cylinder (11), loading device (1) is installed above the hoisting pipe (9) to be detected of large span drilling equipment, hoisting pipe (9) is connected to loading device (1) by pull rod (7), annular lasso (3), pull rod (7) is fixed on loading oil cylinder (12) of loading device (1) by lock nut (13), strain gauge I (19), strain gauge II (20), strain gauge III (21), strain gauge IV (22) are respectively pasted at the position of a centimeter from the outer end surface of hoisting pipe longitudinal rib (16) and hoisting pipe transverse rib (18) in four directions of hoisting pipe body (17), annular lasso (3) is hung to hoisting pipe (9), inclined strut (2) upper end is connected with loading device base (10), lower end is supported on large span drilling equipment (8), and loading device base (10) is contacted with the surface of large span drilling equipment (8) flat by adjusting the length of inclined strut (2);Strain gauge I (19), strain gauge II (20), strain gauge III (21), strain gauge IV (22) are respectively pasted at the position of a centimeter from the outer end surface of hoisting pipe longitudinal rib (16) and hoisting pipe transverse rib (18) in four directions of hoisting pipe body (17), annular lasso (3) is hung to hoisting pipe (9), inclined strut (2) upper end is connected with loading device base (10), lower end is supported on large span drilling equipment (8), and loading device base (10) is contacted with the surface of large span drilling equipment (8) flat by adjusting the length of inclined strut (2);Rotating lock nut (13) makes pull rod (7) and annular lasso (3) be in tension state as a whole, hoisting pipe (9) is loaded by hydraulic system, and the stress data of hoisting pipe is monitored and collected by strain gauge in the middle of hoisting pipe (9) during loading, according to the stress data of measuring point obtained by loading, the stress on hoisting pipe body is synthesized by following formula: In the formula: — the absolute value of the axial tensile or compressive stress of the hoisting pipe body when the hoisting pipe bears the design maximum rated load, MPa; — the bending compressive stress of the hoisting pipe body around the x-axis direction when the hoisting pipe bears the design maximum rated load, MPa; — the bending compressive stress of the hoisting pipe body around the y-axis direction when the hoisting pipe bears the design maximum rated load, MPa; , , , — respectively, the stress values measured by strain gauge I (19), strain gauge II (20), strain gauge III (21), strain gauge IV (22), MPa; Will , , The stresses were compared with the allowable stress of the lifting pipe material, respectively. Provided that the allowable stress of the lifting pipe material is not exceeded. , , , , , None of these parameters can exceed the allowable stress of the lifting pipe material, thus achieving the purpose of determining the bending resistance and overall load-bearing capacity of the lifting pipe on large-span drilling equipment.

2. The method of claim 1, wherein, The top of pull rod (7) and loading oil cylinder (12) is fixed by lock nut (13).

3. The method of claim 2, wherein the method further comprises: Specifically, the following steps are implemented: Step 1: adjust the position and spacing of lower compression pad and bolt (14) of loading device base (10) according to the position of hoisting pipe, then install loading device base (10) on the equipment plane above the hoisting pipe (9) to be detected of large span drilling equipment (8), and fix firmly by compression pad and bolt (14); Step 2: place loading cylinder (11) and loading oil cylinder (12) of loading device (1) on loading device base (10) at appropriate position;The upper part of pull rod (7) is upwardly penetrated to the top of loading oil cylinder (12) through the hole in the middle of loading device base (10) and loading oil cylinder (12), and temporarily fixed by lock nut (13); Step 3: paste strain gauge I (19), strain gauge II (20), strain gauge III (21) and strain gauge IV (22) at the position of a centimeter from the outer end surface of hoisting pipe longitudinal rib (16) and hoisting pipe transverse rib (18) in four directions of hoisting pipe body (17) respectively, then connect the cable of strain gauge to comprehensive control system (4) through stress collection cable (6); Step 4: The ring lasso (3) is hung on the hoisting pipe (9), the upper part of the ring lasso (3) is connected with the lower part of the pull rod (7) through a pin to form an integral whole; the upper end of the diagonal brace (2) is connected with the loading device base (10), the lower end is supported on the large-span drilling equipment (8), and the loading device base (10) is in flat contact with the surface of the large-span drilling equipment (8) by adjusting the length of the diagonal brace (2); the locking nut (13) is rotated to make the pull rod (7) and the ring lasso (3) in a tension state as a whole; Step 5: The loading hydraulic pipeline (5) is connected from the loading oil cylinder (12) to the comprehensive control system (4); after the test load, loading time, steady load time, and data acquisition are set through the comprehensive control system (4), the loading of the hoisting pipe can be started; after the loading is completed, a standardized test report containing the loading curve and the measured point data is output; Step 6: According to the measured point stress data obtained by loading, the stress on the hoisting pipe body is synthesized through the following formula: In the formula: — the absolute value of the axial tensile or compressive stress of the hoisting pipe body when the hoisting pipe bears the design maximum rated load, MPa; — the bending compressive stress of the hoisting pipe body around the x-axis direction when the hoisting pipe bears the design maximum rated load, MPa; — the bending compressive stress of the hoisting pipe body around the y-axis direction when the hoisting pipe bears the design maximum rated load, MPa; , , , — respectively, the stress values measured by strain gauge I (19), strain gauge II (20), strain gauge III (21), strain gauge IV (22), MPa; Step 7: [The text appears to be incomplete and contains several grammatical errors. A more accurate translation would require the full context.] , , The stresses were compared with the allowable stress of the lifting pipe material, respectively. Provided that the allowable stress of the lifting pipe material is not exceeded. , , , , , None of these parameters can exceed the allowable stress of the lifting pipe material, thus achieving the purpose of determining the bending resistance and overall bearing capacity of the lifting pipe on large-span drilling equipment; Step 8: If measured or calculated , , , , , , If any one or more values ​​exceed the allowable stress value of the lifting pipe body material, then the material optimization of the lifting pipe body (17) is required, or the dimensions of the longitudinal stiffener (16) and the transverse stiffener (18) of the lifting pipe are adjusted, thereby optimizing the design of the lifting pipe (9).

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