CN108007792B - Earthquake-high pressure load combined loading test method for in-service deep sea seabed buried pipeline - Google Patents
Earthquake-high pressure load combined loading test method for in-service deep sea seabed buried pipeline Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/023—Pressure
- G01N2203/0232—High pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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Abstract
The invention relates to an earthquake-high pressure load combined loading test method for an in-service deep sea seabed buried pipeline, which adopts a device comprising a cabin body, wherein the cabin body comprises a cabin body main body (4) and a cabin cover (3); the test pipe fitting (30) is positioned in the cabin body main body, the front end of the test pipe fitting is connected with a high-temperature oil input hard pipe (24), the high-temperature oil input hard pipe penetrates through a pipe fitting front end flange (23) respectively, and is connected with a high-temperature oil input hole (17) on the cabin cover after passing through a front end flange rubber interlayer (22), a front end connecting flange (21) and a cabin body front end flange (20); a pipe-soil actuating cylinder (26) is fixed outside the test pipe fitting (30), and a data wire through hole (29) is formed in the pipe-soil actuating cylinder. The test method comprises the following steps: and closing the drain hole, injecting water into the cabin body by using the water inlet hole, standing for a certain time after the water injection is finished, injecting high-temperature oil into the test pipe fitting through the high-temperature oil input hole by using external high-temperature oil equipment after the soil body in the pipe soil actuating cylinder is in a saturated water state, and outputting the high-temperature oil to the high-temperature oil equipment through the high-temperature oil output hole.
Description
Technical Field
The invention provides a deep-sea in-service buried pipeline earthquake-high pressure combined loading test device, which can realize the combined action of high pressure and earthquake load on a buried pipeline at the same time, can approximately simulate the action of an earthquake and submarine geological disaster on a submarine buried pipeline in service, and realizes the safety evaluation on the in-service submarine buried pipeline.
Technical Field
The core competitiveness of energy safety and world economy increasingly depends on the utilization and development degree of ocean resources, the oil and gas reserves of south China sea are huge, a large amount of clean energy is provided, and the exploitation value is huge. In recent years, China makes great progress in the field of oil and gas development in the deep sea field, and accumulates a great deal of experience in the shallow sea field. However, in the field of deep sea, especially in the field of south sea in China, the oil and gas exploitation difficulty is suddenly improved due to the complex and changeable environment and multiple geological disasters on the seabed, and the key core technology is urgently needed to be solved.
The deep sea oil pipeline has great investment in deep sea oil and gas development project, and its design, construction and relevant technology are the key points in deep sea oil and gas resource development. The oil pipeline is used as a life line of ocean oil and gas resources, and the safe operation of the oil pipeline is an important guarantee for effectively utilizing the deep sea oil and gas resources. In order to ensure the in-place stability of the oil and gas transmission pipeline, the oil and gas transmission pipeline is mostly buried in engineering practice, the oil and gas transmission pipeline can be subjected to the action of high-pressure and high-temperature internal flow and seismic load in the operation process, the seismic load becomes the main control load of the buried pipeline due to the special geographical position and geological conditions of south China sea, all deep sea oil and gas transmission pipelines need dynamic load accounting and test verification, but due to the special buried environment, the high-pressure and dynamic load combined load needs to be applied in the test process, and the pipe-soil coupling effect is considered, so that the problem in the academic world is always solved.
A large number of domestic and foreign research results show that the scale test result can be used as a reference standard of actual design through relevant principles such as approximate proportion and the like. The defects of the existing deep sea oil and gas pipeline composite loading test method at home and abroad are mainly as follows:
1. in the aspect of limit load research, tests are carried out by building special pressure equipment at home and abroad, the simulated external load is single, mainly the influence of axial force or bending moment under the action of water pressure on the mechanical property of a submarine pipeline cannot be realized, a local stability test under the combined action of various loads cannot be realized, and the pipe-soil coupling interaction cannot be considered in the test process;
2. if the buried pipeline applies earthquake load while considering the coupling effect of pipe and soil, related equipment at home and abroad can only perform similar tests under normal pressure or shallow water environment and cannot simulate high-pressure load borne by a deep-sea pipeline;
3. the related devices at home and abroad can not realize the dynamic test of the deep sea oil and gas transmission pipeline under high pressure under the action of high water pressure and dynamic load.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a test method capable of simulating earthquake-high pressure combined loading of an in-service deep-sea buried pipeline. The invention introduces pipe-soil coupling effect, high-temperature internal flow effect, external high water pressure and earthquake load, and can realize combined loading of high-temperature internal flow, external high water pressure and earthquake load. The technical scheme of the invention is as follows:
an earthquake-high pressure load combined loading test method for an in-service deep sea seabed buried pipeline comprises the following steps that an adopted device comprises a cabin body, wherein the cabin body comprises a cabin body main body (4) and a cabin cover (3);
the cabin body is provided with a plurality of openings, including a data acquisition hole (6), a pressurization hole (7), a vertical shock application hole (8), a lateral shock application hole (11), a bottom opening (10), a lateral opening (13), a water inlet hole (14), a drain hole (15), a high-temperature oil input hole (17) and a high-temperature oil output hole (16); vibration exciting devices are arranged at the vertical vibration exciting hole (8) and the lateral vibration exciting hole (11) and are used for applying vibration load to the pipe fitting in the radial direction;
the test pipe fitting (30) is positioned in the cabin body main body, the front end of the test pipe fitting is connected with a high-temperature oil input hard pipe (24), the high-temperature oil input hard pipe penetrates through a pipe fitting front end flange (23) respectively, and is connected with a high-temperature oil input hole (17) on the cabin cover after passing through a front end flange rubber interlayer (22), a front end connecting flange (21) and a cabin body front end flange (20); the rear end of the cabin body is also connected with a high-temperature oil output hard pipe (39), which penetrates through a pipe fitting tail end flange (38) and is connected with a high-temperature oil output hole (16) at the rear end of the cabin body after passing through a tail end flange rubber interlayer (37), a tail end connecting flange (36) and a cabin body tail end flange (35);
a pipe-soil actuating cylinder (26) is fixed outside the test pipe fitting (30), and a data line through hole (29) is formed in the pipe-soil actuating cylinder to ensure that high-pressure water can smoothly pass through while a data measurement line passes through; the two ends in the pipe-soil actuating cylinder (26) are provided with high-elasticity rubber (25), the cross section of the pipe-soil actuating cylinder is a circular ring, the outer wall of the pipe-soil actuating cylinder is in contact with the inner wall of the pipe-soil actuating cylinder (26), and the inner wall of the pipe-soil actuating cylinder is in contact with the outer wall of the test pipe fitting (30) so as to ensure that a soil body is not scattered in the experimental process;
the test steps include: after the test pipe fitting and the pipe soil actuating cylinder are installed in place, the vertical shock actuating rod and the lateral shock actuating rod are respectively connected with the vertical shock device and the lateral shock device through the lateral opening and the bottom opening, then the lateral opening and the bottom opening are respectively closed, the drain hole is closed, water is injected into the cabin body through the water inlet hole, after the water injection is finished, standing is carried out for a certain time, after a soil body in the pipe soil actuating cylinder is in a saturated water state, high-temperature oil is injected into the test pipe fitting through the high-temperature oil input hole by using external high-temperature oil equipment, and the high-temperature oil is output to the high-temperature oil equipment through the high-temperature oil output hole.
The invention considers the high-pressure-earthquake load combined loading under the pipe-soil coupling effect, can realize the simultaneous application of high-temperature internal flow-earthquake-high-pressure combined loading under the pipe-soil coupling condition of the deep-sea buried pipeline with the reduced scale, and simulates the extreme operating environment of the deep-sea seabed buried pipeline. Compared with the prior art at home and abroad, the invention has the following advantages: the combined loading of high pressure-vibration load can be realized, pipe-soil coupling interaction is realized by using the pipe-soil actuating cylinder, and bidirectional vibration load and high-temperature oil pressure load can be simultaneously applied, so that the load working condition is fit to the reality as far as possible.
Drawings
FIG. 1 front view of a high-pressure cabin
The reference numbers in the figures illustrate: 1-cabin cover locking device support; 2-hatch cover locking device; 3- -hatch cover; 4- -cabin body; 5, cabin body supporting; 6- -data acquisition well; 7- -pressurized hole; 8-vertical shock application hole; 9-vertical vibration exciting device; 10- -bottom hole; 14- -water injection hole; 15- -drain hole; 16- -high temperature oil output hole; 17- -high temperature oil input hole; 18-tail stud; 19-tail stud fixing nut.
FIG. 2 plan view of the high-pressure chamber
The reference numbers in the figures illustrate: 2-hatch cover locking device; 3, a hatch cover; 4-cabin body; 6-data acquisition holes; 7-pressurized hole; 9-vertical vibration exciting device; 11- -lateral shock imparting holes; 12-a lateral shock device; 13- -lateral opening; 14- -water injection hole; 16-high temperature oil output hole; 17-high temperature oil input hole.
FIG. 3 is a schematic view of a soil actuator cylinder
The reference numbers in the figures illustrate: 20- -cabin front flange; 21-front end connecting flange; 22-front flange rubber barrier; 23- -pipe front flange; 24- -high temperature oil input hard tube; 25- -high elastic rubber; 26-a soil-in-pipe actuator cylinder; 27-high temperature oil transportation inside the pipe fitting; 28- -soil mass; 29- -data line exit hole; 30- -test tube; 31-vertically before shock the actuating rod; 32-vertical shock actuating rod; 33- -spherical connecting groove; 34-shock loading ring; 35- -cabin tail flange; 36-tail end connecting flange; 37-tail flange rubber interlayer; 38- -pipe end flange; 39- -high temperature oil export hard pipe; 40-actuating the rod before lateral shock; 41-lateral shock actuating rod; 42- -spherical connecting groove.
FIG. 4A-A is a schematic sectional view
The reference numbers in the figures illustrate: 26-a soil-in-pipe actuator cylinder; 27-high temperature oil transportation inside the pipe fitting; 28- -soil mass; 29- -data line exit hole; 30- -test tube; 31-vertically before shock the actuating rod; 32-vertical shock actuating rod; 33- -spherical connecting groove; 34-shock loading ring; 40-moving the rod before lateral shock; 41-lateral shock actuating rod; 42- -spherical connecting groove.
The specific implementation mode is as follows:
the embodiments of the invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 and 2, a closed high-pressure environment is formed by using a deep water hyperbaric chamber apparatus which is mainly composed of a chamber body 4, a chamber cover 3 and a locking device 2 thereof. The whole cabin body is supported and fixed on the ground by a cabin body support 5, and the end cover 3 and the locking device 2 thereof are supported and fixed on the ground by a cabin cover locking device support 1. The cylinder body is provided with a plurality of openings, including a data acquisition hole 6, a pressurizing hole 7, a vertical shock applying hole 8, a bottom opening 10, a lateral shock applying hole 11, a lateral opening 13, a water inlet hole 14, a water outlet hole 15, a high-temperature oil output hole 16 and a high-temperature oil input hole 17. The two ends of the test pipe fitting 30 are sealed, the front end of the pipe fitting is connected with a high-temperature oil input hard pipe 24 which penetrates through a pipe fitting front end flange 23, the pipe fitting front end is connected with a high-temperature oil input hole 17 on the cabin body through a front end flange rubber interlayer 22, a front end connecting flange 21, a cabin body front end flange 20 and the cabin cover 3, the rear end of the pipe fitting is also connected with a high-temperature high-pressure oil output hard pipe 39 which penetrates through a pipe fitting tail end flange 38 and is connected with a high-temperature oil output hole 16 on the cabin body through a tail end flange rubber interlayer 37, a tail end connecting flange 36, a cabin body tail end flange 35. This ensures that the test tube 30 has high temperature oil inside to simulate its actual operating conditions.
As shown in fig. 3 and 4, the tube and soil cylinder assembly is shown schematically. The soil-in-pipe actuating cylinder 26 is internally provided with soil bodies 28 made of different materials, and the top end of the soil-in-pipe actuating cylinder is provided with a data line through hole 29 for ensuring that the data measuring line passes through and high-pressure water can pass through smoothly. The high-elasticity rubber 25 is arranged at two ends inside the pipe-soil actuating cylinder 26, the cross section of the high-elasticity rubber is circular, the outer wall of the high-elasticity rubber is in contact with the inner wall of the pipe-soil actuating cylinder 26, and the inner wall of the high-elasticity rubber is in contact with the outer wall of the test pipe fitting 30, so that the soil body is prevented from scattering in the experiment process. The vertical vibration exciting device 9 and the lateral vibration exciting device 12 can apply different types of earthquake loads by utilizing a servo hydraulic oil cylinder, the earthquake loads are respectively connected with the actuating rods 32 and 41 through the front actuating rods 31 and 40 and universal balls, and the other ends of the actuating rods 32 and 41 are respectively connected with the spherical connecting grooves 33 and 42 on the vibration exciting loading ring 34 through the universal balls, so that the simultaneous loading of two-way vibration exciting can be ensured without interference.
In the test process, after the test pipe fitting 30 and the pipe-soil actuating cylinder 29 are installed in place, the vertical shock actuating rod 31 and the lateral shock actuating rod 40 are respectively connected with the vertical shock device 9 and the lateral shock device 12 through the lateral opening 13 and the bottom opening 10. Then, the lateral opening 13 and the bottom opening 10 are respectively closed, the drain hole 15 is closed, water is injected into the cabin body through the water inlet hole 14, after the water injection is finished, standing is carried out for a certain time, after the soil body in the soil-in-pipe actuating cylinder 29 is in a saturated water state, high-temperature oil is injected into the test pipe fitting 30 through the high-temperature oil input hole 17 by using external high-temperature oil equipment, and the high-temperature oil is output to the high-temperature oil equipment through the high-temperature oil output hole 16.
Claims (1)
1. An earthquake-high pressure load combined loading test method for an in-service deep sea seabed buried pipeline comprises the following steps that an adopted device comprises a cabin body, wherein the cabin body comprises a cabin body main body (4) and a cabin cover (3);
the cabin body is provided with a plurality of openings, including a data acquisition hole (6), a pressurization hole (7), a vertical shock application hole (8), a lateral shock application hole (11), a bottom opening (10), a lateral opening (13), a water inlet hole (14), a drain hole (15), a high-temperature oil input hole (17) and a high-temperature oil output hole (16); vibration exciting devices are arranged at the vertical vibration exciting hole (8) and the lateral vibration exciting hole (11) and are used for applying vibration load to the pipe fitting in the radial direction;
the test pipe fitting (30) is positioned in the cabin body main body, the front end of the test pipe fitting is connected with a high-temperature oil input hard pipe (24), the high-temperature oil input hard pipe (24) penetrates through a pipe fitting front end flange (23) respectively, and is connected with a high-temperature oil input hole (17) on the cabin cover after passing through a front end flange rubber interlayer (22), a front end connecting flange (21) and a cabin body front end flange (20); the rear end of the cabin body is also connected with a high-temperature oil output hard pipe (39), the high-temperature oil output hard pipe (39) penetrates through a pipe fitting tail end flange (38), and is connected with a high-temperature oil output hole (16) at the rear end of the cabin body after passing through a tail end flange rubber interlayer (37), a tail end connecting flange (36) and a cabin body tail end flange (35);
a pipe-soil actuating cylinder (26) is fixed outside the test pipe fitting (30), and a data line through hole (29) is formed in the pipe-soil actuating cylinder to ensure that high-pressure water can smoothly pass through while a data measurement line passes through; the two ends in the pipe-soil actuating cylinder (26) are provided with high-elasticity rubber (25), the cross section of the pipe-soil actuating cylinder is a circular ring, the outer wall of the pipe-soil actuating cylinder is in contact with the inner wall of the pipe-soil actuating cylinder (26), and the inner wall of the pipe-soil actuating cylinder is in contact with the outer wall of the test pipe fitting (30) so as to ensure that a soil body is not scattered in the experimental process;
the test steps include: after the test pipe fitting and the pipe soil actuating cylinder are installed in place, the vertical shock actuating rod and the lateral shock actuating rod are respectively connected with the vertical shock device and the lateral shock device through the lateral opening and the bottom opening, then the lateral opening and the bottom opening are respectively closed, the drain hole is closed, water is injected into the cabin body through the water inlet hole, after the water injection is finished, standing is carried out for a certain time, after a soil body in the pipe soil actuating cylinder is in a saturated water state, high-temperature oil is injected into the test pipe fitting through the high-temperature oil input hole by using external high-temperature oil equipment, and the high-temperature oil is output to the high-temperature oil equipment through the high-temperature oil output hole.
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| CN108801798B (en) * | 2018-06-15 | 2021-02-09 | 中国海洋石油集团有限公司 | Complicated load test device for providing axial force loading by water pressure |
| CN110018047A (en) * | 2019-03-12 | 2019-07-16 | 天津大学 | A kind of deep-sea pipeline Complicated Loads combination loading pilot system |
| CN110196156B (en) * | 2019-03-12 | 2024-03-22 | 天津大学 | Deep sea pipeline complex load combined loading test method |
| CN112197925B (en) * | 2020-09-30 | 2021-11-30 | 天津大学 | Connecting device for double-shaft bidirectional vibration loading test |
| CN112461468A (en) * | 2020-11-18 | 2021-03-09 | 中国核动力研究设计院 | Seismic test equipment pipe connection load simulation device and simulation method |
| CN112577826B (en) * | 2020-12-02 | 2022-12-23 | 天津大学 | Test platform for simulating uniform load of pipeline in deepwater environment |
| CN112577827B (en) * | 2020-12-02 | 2022-03-29 | 天津大学 | Test method for simulating uniform load of pipeline in deepwater environment |
| CN114018539B (en) * | 2021-09-15 | 2023-08-29 | 山东大学 | Submarine oil and gas pipeline stability model test device and test method |
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