A testing device for the compression limit of deep-sea oil and gas pipelines

Abstract

A device for testing the compression resistance of deep-sea oil and gas pipelines includes a first support seat and a second support seat. The first support seat includes a first exhaust hole, a second exhaust hole, and a first pipe fitting installation position; the second support seat includes a first water injection hole, a second water injection hole, and a second pipe fitting installation position. The first support seat and the second support seat are connected to form a pipe fitting test chamber, and the first support seat and the second support seat respectively connect the pipe to be tested in the pipe fitting test chamber through the first pipe fitting installation position and the second pipe fitting installation position, and the pipe fitting test chamber is divided into a first test chamber and a second test chamber by the pipe to be tested. The first exhaust hole and the first water injection hole are respectively connected to the first test chamber, and the second exhaust hole and the second water injection hole are respectively connected to the second test chamber to perform a pressure test on the pipe to be tested. This solution adopts a dual-test chamber structural design to improve the accuracy of the test device test, enhance the safety of deep-sea pipe fitting design, and reduce the cost of pipe fitting compression testing.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline testing devices, and in particular relates to a testing device for the compression resistance limit of deep-sea oil and gas pipelines. Background Art

[0002] Pipe fittings are widely used as key components in many deep-sea engineering fields, such as deep-sea oil and gas resource development and submarine tunnel construction. In deep-sea environments, these pipe fittings not only endure extremely high external water pressure for long periods of time, but also must withstand internal pressure when transporting fluids.

[0003] Currently, existing technologies for pipe crush testing have significant limitations. While full-length pipe crush failure tests can accurately reflect actual subsea operating conditions, the cost of a single test is high, and only a handful of laboratories are equipped with large pressure testing chambers to conduct such tests. Furthermore, most tests can only simulate a single external or internal pressure environment, failing to realistically replicate the complex deep-sea conditions where pipes are subjected to both internal and external pressures. This can easily lead to an underestimation of the pipe's compressive strength during the design process, creating potential safety risks. Therefore, the present invention proposes a novel solution to these technical issues. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device for the compression resistance limit of deep-sea oil and gas pipelines. The dual-test chamber structural design is adopted to improve the accuracy of the test device in testing the pressure resistance of the tested pipe fittings, enhance the safety of deep-sea pipe fitting design, and reduce the cost of pipe fitting compression testing.

[0005] Based on this, the present invention provides a testing device for the crush resistance limit of deep-sea oil and gas pipelines, comprising:

[0006] A first support base, the first support base comprising a first exhaust hole, a second exhaust hole, and a first pipe installation position;

[0007] A second support base, the second support base comprising a first water injection hole, a second water injection hole, and a second pipe installation position;

[0008] In which, the first support seat and the second support seat are connected to form a pipe testing chamber, and the first support seat and the second support seat respectively connect the pipe to be tested into the pipe testing chamber through the first pipe mounting position and the second pipe mounting position, and the pipe testing chamber is divided into a first testing chamber and a second testing chamber by the pipe to be tested; the first exhaust hole and the first water injection hole are respectively connected to the first testing chamber, and the second exhaust hole and the second water injection hole are respectively connected to the second testing chamber to perform a pressure test on the pipe to be tested.

[0009] The above-mentioned device for testing the crush resistance of deep-sea oil and gas pipelines further includes a displacement test module, which is connected to the second test chamber to measure the radial deformation of the pipe to be tested.

[0010] In the test device for the compression collapse limit of a deep-sea oil and gas pipeline as described above, the second support seat is also provided with a first sealing protrusion, the first support seat is connected to the second support seat, and the second test chamber is divided into an internal water injection test area and a waterless test area by the first sealing protrusion; the displacement test module is installed in the waterless test area, and passes through the first sealing protrusion to the internal water injection test area to measure the radial deformation of the pipe to be tested.

[0011] As described above, in a testing device for the crush resistance limit of a deep-sea oil and gas pipeline, the displacement testing module includes multiple displacement sensors and multiple mobile measuring structures. The displacement sensors are connected to the waterless test area; the mobile measuring structure passes through the first sealing protrusion and abuts against the inner wall of the pipe to be tested, and is capable of moving relative to the displacement sensor.

[0012] In the above-described device for testing the compression limit of a deep-sea oil and gas pipeline, the movable measuring structure includes a pin, a first limiter, and a second limiter. The two first limiters are relatively arranged on both sides of the first sealing protrusion, and the second limiter and the first limiter are connected to one side of the waterless test area. One end of the pin is connected to the first limiter, and the other end is connected to the second limiter for positioning. The pin abuts against the inner wall of the pipe to be tested and is movable relative to the displacement sensor.

[0013] As described above, in the testing device for the compression collapse limit of deep-sea oil and gas pipelines, the first support seat is also provided with a first pressure measuring hole and a second pressure measuring hole for installing a pressure gauge, and the first pressure measuring hole and the second pressure measuring hole are respectively connected to the first test chamber and the internal water injection test area.

[0014] As described above, in a testing device for the compression collapse limit of a deep-sea oil and gas pipeline, the first support seat is provided with a second sealing protrusion on the outer side of the first pipe fitting installation position, and a first sealing groove is provided on the inner side of the first pipe fitting installation position; the second support seat is provided with a second sealing groove on the outer side of the second pipe fitting installation position, and the first sealing protrusion and the second sealing protrusion are respectively connected to the first sealing groove and the second sealing groove to limit the first support seat and the second support seat.

[0015] The testing device for the compression collapse limit of a deep-sea oil and gas pipeline as described above also includes a first sealing ring, a second sealing ring, and a pipe sealing ring group. The pipe sealing ring group includes a first pipe sealing ring and a second pipe sealing ring for sealing both ends of the pipe to be tested; the first sealing ring and the second sealing ring are respectively connected to the first sealing groove and the second sealing groove to cooperate with the first sealing protrusion and the second sealing protrusion to seal the first support seat and the second support seat.

[0016] As described above, in the test device for the compression limit of deep-sea oil and gas pipelines, the first support seat is also provided with a sensor connection line hole, the sensor connection line hole is connected to the waterless test area, and the displacement sensor is connected to the external power connection line through the sensor connection line hole.

[0017] In the above-mentioned testing device for the crush resistance limit of deep-sea oil and gas pipelines, the first support seat and the second support seat are of an integrally formed structural design, and the first support seat and the second support seat are connected by a bolt group arranged in a ring.

[0018] The beneficial effects of the present invention are:

[0019] This solution adopts a double test chamber structural design, connects the pipe ring to be tested in the pipe fitting test chamber formed by the connection of the first support seat and the second support seat, and divides the pipe fitting test chamber into a first test chamber and a second test chamber through the pipe ring to be tested, and then connects the first test chamber through the first exhaust hole and the first water injection hole respectively, and connects the second test chamber through the second exhaust hole and the second water injection hole respectively; then water is injected into the first test chamber and the second test chamber and the pressure is adjusted through the first water injection hole and the second water injection hole respectively, and the excess air in the first test chamber and the second test chamber is discharged through the first exhaust hole and the second exhaust hole, so that the first test chamber and the second test chamber can simulate the working condition of the pipe fitting in the deep sea being subjected to internal pressure and external pressure at the same time, simplifying the operation process, improving the convenience of the test device, and achieving the effect of improving the accuracy of the test device in testing the pressure resistance of the pipe fitting to be tested, improving the safety of deep-sea pipe fitting design, and reducing the cost of pipe fitting crush testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0022] Figure 2To correspond Figure 1 Structural diagram of the other direction;

[0023] Figure 3 To correspond Figure 2 Structural diagram of the other direction;

[0024] Figure 4 To correspond Figure 3 AA cross-sectional view;

[0025] Figure 5 To correspond Figure 4 A magnified view of the structure of part B;

[0026] Figure 6 An exploded diagram of the structure of an embodiment of the present invention;

[0027] Figure 7 To correspond Figure 6 Structural diagram of the other direction;

[0028] Figure 8 This is a schematic diagram of a structure in which part of the structure of an embodiment of the present invention is installed on a second support base;

[0029] Figure 9 To correspond Figure 8 Exploded diagram of part of the structure.

[0030] In the figure: 1-first support seat, 11-first exhaust hole, 12-second exhaust hole, 13-first pipe installation position, 131-third sealing slot, 15-first pressure measuring hole, 16-second pressure measuring hole, 17-second sealing protrusion, 171-sixth sealing slot, 18-first sealing slot, 181-eighth sealing slot, 19-sensor connection line hole; 2-second support seat, 21-first water injection hole, 22-second water injection hole, 23-second pipe installation position, 231-fourth sealing slot, 24-first sealing protrusion, 241-sleeve connection hole, 242-thimble sealing sleeve, 243-fifth sealing slot, 25-second sealing slot, 251-seventh sealing slot; 3-displacement Test module, 31-displacement sensor, 32-movable measuring structure, 321-thimble component, 3211-conical abutment portion, 3212-first connecting end, 3213-limiting boss, 3214-second connecting end, 322-first limiting component, 3221-first movable limiting hole, 323-second limiting component, 3231-top cap, 3232-reset spring, 3233-second movable limiting hole; 41-first test chamber, 421-internal water injection test area, 422-waterless test area; 5-pipe fitting to be tested; 6-first sealing ring; 7-second sealing ring; 81-first pipe fitting sealing ring, 82-second pipe fitting sealing ring; 91-first annular connection group, 92-second annular connection group. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] like Figures 1 to 9 As shown, an embodiment of the present invention provides a test device for the compression collapse limit of a deep-sea oil and gas pipeline, comprising: a first support seat 1 and a second support seat 2, wherein the first support seat 1 comprises a first exhaust hole 11, a second exhaust hole 12, and a first pipe fitting installation position 13; the second support seat 2 comprises a first water injection hole 21, a second water injection hole 22, and a second pipe fitting installation position 23; wherein the first support seat 1 and the second support seat 2 are connected to form a pipe fitting test cavity, and the first support seat 1 and the second support seat 2 respectively connect the pipe fitting 5 to be tested in the pipe fitting test cavity through the first pipe fitting installation position 13 and the second pipe fitting installation position 23, and the pipe fitting test cavity is divided into a first test chamber 41 and a second test chamber through the pipe fitting 5 to be tested, so as to simulate the internal pressure and external pressure conditions of the pipe fitting 5 to be tested through the first test chamber 41 and the second test chamber; the first exhaust hole 11, the first injection hole 21, the second water injection hole 22, and the second pipe fitting installation position 23 The water holes 21 are respectively connected to the first test chamber 41, so that water can be injected into the first test chamber 41 through the first water injection hole 21 to adjust the pressure, and excess air can be discharged through the first exhaust hole 11, thereby simulating the internal working conditions of the pipe to be tested 5 during transportation; the second exhaust hole 12 and the second water injection hole 22 are respectively connected to the second test chamber for the pipe to be tested 5, so that water can be injected into the second test chamber through the second water injection hole 22 to adjust the pressure, and excess air can be discharged through the second exhaust hole 12, thereby simulating the external working conditions of the pipe to be tested 5 during transportation; such a design facilitates the simultaneous simulation of the working conditions of the deep-sea pipe under simultaneous internal and external pressures through a single test device, and reduces the cost of testing, thereby improving the accuracy of the test device in testing the pressure resistance of the pipe to be tested, improving the safety of deep-sea pipe design, and reducing the cost of pipe crush testing.

[0033] In the embodiment of the present invention, the pipe member 5 to be tested is a test pipe ring cut from the pipe to be tested, so as to reduce the cost of a single test of the full-length pipe to be tested.

[0034] A testing device for the crush resistance limit of deep-sea oil and gas pipelines provided in an embodiment of the present invention also includes a displacement testing module 3. The displacement testing module 3 is connected to the second testing chamber to measure the radial deformation of the pipe to be tested 5, so as to collect deformation data of the pipe to be tested 5 during the crush resistance test through the displacement testing module 3, thereby facilitating the improvement of deep-sea pipe fittings and enhancing the safety of deep-sea pipe fittings.

[0035] Furthermore, the second support seat 2 is also provided with a first sealing protrusion 24, the first support seat 1 is connected to the second support seat 2, and the second test chamber is divided into an internal water injection test area 421 and a water-free test area 422 by the first sealing protrusion 24, so as to seal the internal water injection test area 421, thereby improving the convenience of parameter adjustment during the test process; the displacement test module 3 is installed in the water-free test area 422, and passes through the first sealing protrusion 24 to the internal water injection test area 421 to measure the radial deformation of the test pipe 5 to be tested, so as to prevent liquid from leaking from the internal water injection test area 421 to the water-free test area 422, affecting the normal operation and measurement accuracy of the displacement test module 3, extending the service life of the displacement test module 3, thereby reducing the maintenance cost of the test device; at the same time, it is convenient for the displacement test module 3 to be electrically connected to the outside, thereby improving the safety of the test device during use.

[0036] Preferably, the displacement test module 3 is installed in the water-free test area 422, and passes through the first sealing protrusion 24 to the internal water injection test area 421 to measure the radial deformation of the pipe 5 to be tested. It is also convenient to calibrate and maintain the displacement test module 3 during the test process. There is no need to disassemble the entire test device. It is only necessary to operate the displacement test module 3 in the water-free test area 422, which improves the flexibility and convenience of the testing work.

[0037] Furthermore, the displacement testing module 3 includes multiple displacement sensors 31 and multiple mobile measuring structures 32. The displacement sensors 31 are connected to the water-free test area 422; the mobile measuring structure 32 passes through the first sealing protrusion 24 and abuts against the inner wall of the pipe to be tested 5, and can move relative to the displacement sensor 31, so as to measure the displacement of the mobile measuring structure 32 through the displacement sensor 31, and then test the radial deformation of the pipe to be tested 5 to ensure the accuracy of the test data.

[0038] Preferably, the displacement sensor 31 is a high-precision laser displacement sensor, which has the characteristics of non-contact measurement, high resolution and fast response, so as to accurately measure the radial deformation of the pipe to be tested 5 during the test process, thereby improving the accuracy of the test data; and the displacement sensor 31 is detachably connected to the waterless test area 422 by a threaded connection, which effectively avoids interference caused by direct contact between the displacement sensor 31 and the pipe to be tested 5, ensuring that the pipe to be tested 5 can operate stably and reliably in a high-pressure and humid test environment, providing high-precision displacement data for the test, and meeting the strict measurement accuracy requirements of the deep-sea oil and gas pipeline anti-collapse limit test.

[0039] Furthermore, the mobile measuring structure 32 includes a pin member 321, a first limiting member 322, and a second limiting member 323. The two first limiting members 322 are relatively arranged on both sides of the first sealing protrusion 24, and the second limiting member 323 and the first limiting member 322 are connected to one side of the water-free test area 422; one end of the pin member 321 is connected to the first limiting member 322, and the other end is connected to the second limiting member 323 for limiting; the pin member 321 abuts against the inner wall of the pipe 5 to be tested and can move relative to the displacement sensor 31.

[0040] Preferably, the ejector member 321 is provided with a conical abutment portion 3211, a first connecting end 3212, a limiting boss 3213, and a second connecting end 3214. The first sealing protrusion 24 is provided with a sleeve connecting hole 241 and an ejector sealing sleeve 242 for sealing the ejector member 321. The first limiting member 322 is provided with a first movable limiting hole 3221 for relative movement of the first connecting end 3212. The second limiting member 323 is provided with a top cap 3231, a return spring 3232, and a second retaining spring 3233. The second movable limiting hole 3233 for relative movement of the second connecting end 3214; the ejector part 321 is an integrally formed structural design, the conical abutment portion 3211 is connected to one end of the first connecting end 3212, the limiting boss 3213 is connected to the other end of the first connecting end 3212, and the second connecting end 3214 is connected to the other side of the limiting boss 3213; the ejector sealing sleeve 242 is connected to the sleeve connecting hole 241, and the two first limiting The ejector sealing sleeve 242 is fastened to the sleeve connecting hole 241 by the component 322. The first connecting end 3212 and the conical abutting portion 3211 abut against the inner wall of the pipe to be tested 5 through the ejector sealing sleeve 242 and the first movable limiting hole 3221, and the maximum extension of the ejector component 321 is limited by the limiting boss 3213. The second connecting end 3214 and the limiting boss 3213 are movably connected to the top cap 3231, and the reset spring 32 32 is connected to the second connecting end 3214, so that when the second connecting end 3214 extends into the waterless test area 422 through the second movable limiting hole 3233, the limiting boss 3213 limits the maximum extension of the ejector 321 and the reset spring 3232 ensures that the ejector 321 automatically resets after the test is completed; the displacement sensor 31 collects the radial deformation of the pipe 5 to be tested by detecting the extension of the second connecting end 3214.

[0041] Furthermore, the first support seat 1 is also provided with a first pressure measuring hole 15 and a second pressure measuring hole 16 for installing a pressure gauge. The first pressure measuring hole 15 and the second pressure measuring hole 16 are arranged on the other side of the first support seat 1 relative to the first exhaust hole 11 and the second exhaust hole 12. The first pressure measuring hole 15 and the second pressure measuring hole 16 are respectively connected to the first test chamber 41 and the internal water injection test area 421, so that the pressure of the first test chamber 41 and the internal water injection test area 421 can be measured in real time by connecting the pressure gauge to the first pressure measuring hole 15 and the second pressure measuring hole 16, and adjusted in time to ensure the accuracy of the test of the testing device.

[0042] Furthermore, the first support seat 1 is provided with a second sealing protrusion 17 on the outer side of the first pipe fitting installation position 13, and a first sealing groove 18 is provided on the inner side of the first pipe fitting installation position 13; the second support seat 2 is provided with a second sealing groove 25 on the outer side of the second pipe fitting installation position 23, and the first sealing protrusion 24 and the second sealing protrusion 17 are respectively connected to the first sealing groove 18 and the second sealing groove 25 to limit the first support seat 1 and the second support seat 2, so as to prevent the first support seat 1 and the second support seat 2 from lateral displacement during the test through the embedded structural design, thereby improving the safety of the testing device during the test.

[0043] A testing device for the compression collapse limit of a deep-sea oil and gas pipeline provided in an embodiment of the present invention also includes a first sealing ring 6, a second sealing ring 7, and a pipe sealing ring group. The pipe sealing ring group includes a first pipe sealing ring 81 and a second pipe sealing ring 82 for sealing the two ends of the pipe 5 to be tested; the first sealing ring 6 and the second sealing ring 7 are respectively connected to the first sealing groove 18 and the second sealing groove 25 to cooperate with the first sealing protrusion 24 and the second sealing protrusion 17 to seal the first support seat 1 and the second support seat 2.

[0044] Preferably, a third sealing groove 131 is provided in the first pipe fitting installation position 13, and a fourth sealing groove 231 is provided in the second pipe fitting installation position 23. The first pipe fitting sealing ring 81 and the second pipe fitting sealing ring 82 are respectively connected to the third sealing groove 131 and the fourth sealing groove 231. The two ends of the pipe fitting 5 to be tested are respectively abutted against the first pipe fitting sealing ring 81 and the second pipe fitting sealing ring 82. The first pipe fitting sealing ring 81 and the second pipe fitting sealing ring 82 are squeezed by the pipe fitting 5 to be tested, so that the first pipe fitting sealing ring 81 and the second pipe fitting sealing ring 82 elastically squeeze the pipe fitting 5 to be tested and tighten the pipe fitting 5 to enhance the sealing performance of the pipe fitting 5 to be tested during the testing process. At the same time, the positioning function of the first pipe fitting sealing ring 81 and the second pipe fitting sealing ring 82 facilitates the improvement of the installation efficiency of the pipe fitting 5 to be tested, thereby enhancing the convenience of the testing device.

[0045] A fifth sealing groove 243 is provided at the connecting end of the first sealing protrusion 24, a sixth sealing groove 171 is provided at the connecting end of the second sealing protrusion 17, a seventh sealing groove 251 is provided in the second sealing groove 25, an eighth sealing groove 181 is provided in the first sealing groove 18, two ends of the first sealing ring 6 are respectively inserted into the eighth sealing groove 181 and the fifth sealing groove 243, and two ends of the second sealing ring 7 are respectively inserted into the seventh sealing groove 251 and the sixth sealing groove 171, so that the first support seat 1 and the second support seat 2 are automatically sealed after the connection is completed, thereby enhancing the sealing of the test device and ensuring the accuracy of the test data.

[0046] Furthermore, the first support seat 1 is also provided with a sensor connection wire hole 19, and the sensor connection wire hole 19 is connected to the water-free test area 422. The displacement sensor 31 is connected to the external power connection wire through the sensor connection wire hole 19 to ensure that the external power connection wire can be connected to the displacement sensor 31 with the shortest path and minimum curvature, and prevent the displacement sensor 31 from loosening or falling off due to vibration or displacement of the test device during the test, thereby further improving the stability and reliability of the test device; at the same time, through the design of the sensor connection wire hole 19, the external power connection wire is effectively prevented from contacting with water, thereby extending the service life of the test device.

[0047] Furthermore, the first support seat 1 and the second support seat 2 are of an integrally formed structural design, preferably manufactured from a high-strength aluminum alloy material in one piece, to ensure that the test device can withstand the high pressure and mechanical stress generated during the test, and enhance the overall strength and stability of the test device; the first support seat 1 and the second support seat 2 are connected by a ring-arranged bolt group.

[0048] Preferably, in an embodiment of the present invention, the first support seat 1 and the second support seat 2 are designed as circular structures, and the bolt group is provided with a first annular connection group 91 and a second annular connection group 92. The first annular connection group 91 and the second annular connection group 92 are both designed to be equidistant along the first support seat 1 and the second support seat 2, and the first annular connection group 91 and the second annular connection group 92 are respectively connected to the outside and inside of the pipe to be tested 5 to tighten the pipe to be tested 5 to ensure the stability of the pipe to be tested 5 during the test process.

[0049] It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information. In addition, the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A device for testing the crush resistance of deep-sea oil and gas pipelines, characterized in that: include: A first support base, the first support base comprising a first exhaust hole, a second exhaust hole, and a first pipe installation position; A second support base, the second support base comprising a first water injection hole, a second water injection hole, and a second pipe installation position; The first support seat and the second support seat are connected to form a pipe test chamber, and the first support seat and the second support seat respectively connect the pipe to be tested into the pipe test chamber through the first pipe installation position and the second pipe installation position, and the pipe test chamber is divided into a first test chamber and a second test chamber by the pipe to be tested; the first exhaust hole and the first water injection hole are respectively connected to the first test chamber, and the second exhaust hole and the second water injection hole are respectively connected to the second test chamber to perform a pressure test on the pipe to be tested; a displacement testing module connected to the second testing chamber to measure the radial deformation of the pipe to be tested; The second support seat is further provided with a first sealing protrusion, the first support seat is connected to the second support seat, and the second test chamber is divided into an internal water injection test area and a water-free test area by the first sealing protrusion; the displacement test module is installed in the water-free test area and passes through the first sealing protrusion to the internal water injection test area to measure the radial deformation of the pipe to be tested; The displacement test module includes a plurality of displacement sensors and a plurality of movable measuring structures. The displacement sensors are connected to the waterless test area. The movable measuring structures pass through the first sealing protrusion and abut against the inner wall of the pipe to be tested, and are capable of moving relative to the displacement sensors. The movable measurement structure includes a ejector pin, a first position-limiting member, and a second position-limiting member. The two first position-limiting members are relatively arranged on both sides of the first sealing protrusion. The second position-limiting member and the first position-limiting member are connected to one side of the waterless test area. One end of the ejector pin is connected to the first position-limiting member, and the other end is connected to the second position-limiting member for position limiting. The ejector pin abuts against the inner wall of the pipe to be tested and is capable of moving relative to the displacement sensor.

2. The device for testing the crush resistance of deep-sea oil and gas pipelines according to claim 1, characterized in that: The first support seat is further provided with a first pressure measuring hole and a second pressure measuring hole for installing a pressure gauge, and the first pressure measuring hole and the second pressure measuring hole are connected to the first test chamber and the internal water injection test area respectively.

3. The device for testing the crush resistance of deep-sea oil and gas pipelines according to claim 1, characterized in that: The first support seat is provided with a second sealing protrusion on the outer side of the first pipe fitting installation position, and a first sealing groove is provided on the inner side of the first pipe fitting installation position; the second support seat is provided with a second sealing groove on the outer side of the second pipe fitting installation position, and the first sealing protrusion and the second sealing protrusion are respectively connected to the first sealing groove and the second sealing groove to limit the first support seat and the second support seat.

4. The device for testing the crush resistance of deep-sea oil and gas pipelines according to claim 3, characterized in that: It also includes a first sealing ring, a second sealing ring, and a pipe sealing ring group. The pipe sealing ring group includes a first pipe sealing ring and a second pipe sealing ring for sealing the two ends of the pipe to be tested; the first sealing ring and the second sealing ring are respectively connected to the first sealing groove and the second sealing groove to cooperate with the first sealing protrusion and the second sealing protrusion to seal the first support seat and the second support seat.

5. The device for testing the crush resistance of deep-sea oil and gas pipelines according to claim 1, characterized in that: The first support seat is further provided with a sensor connection wire hole, the sensor connection wire hole is connected to the water-free test area, and the displacement sensor is connected to the external power connection wire through the sensor connection wire hole.

6. The device for testing the crush resistance of deep-sea oil and gas pipelines according to claim 1, characterized in that: The first support seat and the second support seat are of an integrally formed structural design, and the first support seat and the second support seat are connected by a bolt group arranged in a ring.

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