Underwater mixed pipeline damage simulation experimental device and simulation experimental method

Abstract

The present invention relates to an underwater mixed pipeline damage simulation experimental device, comprising: a pipeline medium simulation system, an underwater damage simulation system and a data acquisition system; the pipeline medium simulation system is used to simulate pipelines for transporting oil, gas, and oil-gas mixed media; the underwater damage simulation system is used to simulate damage to pipelines for transporting oil, gas, and oil-gas mixed media; the data acquisition system is used to collect test data under normal conditions and when the pipeline is damaged. The present invention relates to an underwater mixed pipeline damage simulation experimental method, which summarizes the flow characteristics and laws of the mixed medium when the underwater mixed pipeline is damaged based on the experimental data. The present invention can be used to measure the consequences of damage such as small hole leakage, pipeline rupture and even pipeline breakage. The pipeline can be used as a gas pipeline, an oil pipeline and an oil-gas mixed pipeline for multiple experiments; the operation is simple, and the state of the medium in the water after the pipeline is damaged can be truly reflected.

Description

Technical Field

[0001] The invention relates to an underwater mixed transportation pipeline damage simulation experiment device and a simulation experiment method, belonging to the technical field of submarine pipelines. Background Art

[0002] As the fastest, safest, most economical and reliable way of offshore transportation, submarine pipelines are an important part of the offshore oil and gas field development and production system. The interior of the submarine pipeline is in a state of high temperature and high pressure, and the exterior is subjected to the combined effects of multiple loads and is also affected by accidental factors. At the same time, it faces a huge risk of man-made damage, so the probability of damage to the submarine pipeline increases significantly. If the submarine pipeline is damaged, it may cause serious damage to the pipeline structure, and even serious consequences such as pipeline leakage and rupture may occur, causing a large amount of oil and gas leakage, which may further develop into fire and explosion.

[0003] To study the serious consequences of submarine pipeline damage, relevant theoretical method analysis and simulation analysis have been carried out at home and abroad, but there is still a lack of relevant experimental proof and data support. The experimental devices for submarine pipeline damage are mostly focused on studying the consequences of a single risk such as pipeline leakage, and the devices are relatively simple. Leakage holes are set up in the submarine pipeline at the beginning of the design, and pipeline leakage is achieved through manual switches. The pressure and flow in the pipeline cannot be adjusted, and there are large errors. In particular, there is a lack of experiments on the consequences of damage after small hole leakage in the submarine pipeline, and it is impossible to realize the real-time opening and closing of the submarine pipeline. Therefore, it is necessary to invent an experimental device that can simulate various types of damage to the submarine pipeline and is easy to control the state of the fluid in the pipe. Summary of the invention

[0004] The invention provides an underwater mixed pipeline damage consequence experimental device and an experimental method to make up for the shortcomings of the existing experimental device, such as single research object and large error.

[0005] The present invention is achieved through the following technical solutions:

[0006] An underwater mixed transport pipeline damage simulation experimental device includes: a pipeline transport medium simulation system, an underwater damage simulation system and a data acquisition system, a total of three subsystems;

[0007] The pipeline transport medium simulation system is used to simulate pipelines that transport oil, gas, and oil-gas mixed media; the underwater damage simulation system is used to simulate damage to pipelines that transport oil, gas, and oil-gas mixed media; the data acquisition system is used to collect test data under normal conditions and under conditions where the pipeline is damaged.

[0008] Preferably, the pipeline medium simulation system comprises: an oil storage tank, an oil pump, an oil pipeline manual switch, an air compressor, a gas pipeline manual switch, a tee, a transparent pipe and a return pipe. The oil storage tank is made of aluminum alloy, connected to the oil outlet pipe at the bottom, the oil pump and the oil pipeline manual switch are connected to the oil outlet pipe in sequence, the air compressor on the gas pipeline is connected to the gas pipeline manual switch, the oil outlet pipe and the gas pipeline meet at the tee, connected to the transparent pipe and the return pipe, and the outlet of the return pipe is located above the oil storage tank.

[0009] Preferably, the underwater damage simulation system comprises: a damaged pipeline simulation subsystem and an underwater environment simulation subsystem, the damaged pipeline simulation subsystem is located in the underwater environment simulation subsystem, and the damaged pipeline simulation subsystem is divided into two parts: an underwater damaged horizontal pipe subsystem and an underwater damaged riser subsystem. The underwater damaged cross pipe subsystem includes: an undamaged cross pipe, an undamaged cross pipe pneumatic switch, a damaged cross pipe pneumatic switch and a replaceable damaged cross pipe which are connected in sequence to form a closed loop, wherein the damaged cross pipe pneumatic switch and the replaceable damaged cross pipe are located on the horizontal section of the return pipe; the underwater damaged riser subsystem includes: an undamaged riser, an undamaged riser pneumatic switch, a damaged riser pneumatic switch and a replaceable damaged riser which are connected in sequence to form a closed loop, wherein the damaged riser pneumatic switch and the replaceable damaged riser are located on the vertical section of the return pipe; the underwater environment simulation subsystem includes: a water tank, a drain valve and a drain pipe, the water inlet of the drain valve is connected to the bottom of the water tank, and the water outlet of the drain valve is connected to the drain pipe; the undamaged cross pipe pneumatic switch, the damaged cross pipe pneumatic switch, the undamaged riser pneumatic switch and the damaged riser pneumatic switch are concentrated in an air hose junction box through an air hose, and are connected to a controller through the air hose junction box, and the controller is connected to a computer.

[0010] Preferably, the data acquisition system comprises: a flow sensor for measuring the experimental oil flow, a pressure sensor for measuring the experimental gas pressure, and a mixed medium measuring device for measuring the oil-gas mixed medium. The data acquisition system includes: a first flow sensor for measuring the flow of experimental oil, the first flow sensor is connected to the oil outlet pipeline between the manual switch and the tee of the oil pipeline; a first pressure sensor for measuring the pressure of experimental gas, the first pressure sensor is connected to the gas pipeline between the manual switch and the tee of the gas pipeline; a second flow sensor and a second pressure sensor are connected to the pipeline between the tee and the transparent pipeline, and the second flow sensor and the second pressure sensor constitute a first group of mixed medium measuring devices; in the water tank, a third flow sensor and a third pressure sensor are connected to the return pipeline between the transparent pipeline and the damaged cross pipe pneumatic switch, and the third flow sensor and the third pressure sensor constitute a second group of mixed medium measuring devices; a fourth flow sensor and a fourth pressure sensor are connected to the return pipeline between the replaceable damaged cross pipe and the damaged riser pneumatic switch, and the fourth flow sensor and the fourth pressure sensor constitute a third group of mixed medium measuring devices; a fifth flow sensor and a fifth pressure sensor are connected to the return pipeline after the replaceable damaged riser, and the fifth flow sensor and the fifth pressure sensor constitute a fourth group of mixed medium measuring devices; the signals of all sensors are transmitted to the display through the sensor junction box to display the relevant readings, and the display is connected to the computer.

[0011] Preferably, the controller and the display are arranged in a control cabinet, and there are five flow sensor reading displays above the outer surface of the control cabinet, namely: a first flow sensor reading display, a second flow sensor reading display, a third flow sensor reading display, a fourth flow sensor reading display and a fifth flow sensor reading display; there are five buttons below the outer surface of the control cabinet, namely: a main switch button, an undamaged cross pipe pneumatic switch button, a damaged cross pipe pneumatic switch button, an undamaged riser switch button and a damaged riser pneumatic switch button.

[0012] A method for simulating damage of an underwater mixed transport pipeline, using the aforementioned simulation experiment device, comprises the following steps:

[0013] S1. Turn on the air compressor and controller, debug the pneumatic switch and sensor, and connect the computer and controller;

[0014] S2. Fill the water tank with water according to the test requirements, keep the water level at the required height, turn on the oil pump and the manual switch of the oil pipeline and the manual switch of the gas pipeline to achieve normal flow of oil and gas in the pipeline;

[0015] S3. Adjust the oil output of the oil pump according to the test requirements, record the reading of the first flow sensor, adjust the air output of the air compressor, and record the reading of the first pressure sensor;

[0016] S4. Observe the transparent pipeline, and when the mixed oil and gas reaches a stable state, record the readings of the first, second, third and fourth groups of mixed medium measuring devices in sequence;

[0017] S5.1. Close the undamaged cross pipe switch, open the damaged cross pipe switch, observe the experimental phenomena, and focus on recording the readings of the second and third groups of mixed medium measuring devices;

[0018] S5.2. Close the switch of the undamaged riser, open the switch of the damaged riser, observe the experimental phenomena, and focus on recording the readings of the third and fourth groups of mixed medium measuring devices;

[0019] S6. Close the damaged horizontal pipe switch and damaged vertical pipe switch, and open the undamaged horizontal pipe switch and undamaged vertical pipe switch to allow the mixed medium to continue to circulate for a period of time to prevent water from entering the pipeline;

[0020] S7. Turn off all pneumatic switches, disconnect the power supply, use oil absorbent felt to absorb the residual oil in the water, open the drain valve, and drain the water in the water tank through the drain pipe.

[0021] Preferably, the flow characteristics and laws of the mixed medium when the underwater mixed transport pipeline is damaged are summarized based on experimental data, and flow sensors and pressure sensors are arranged at key positions in the submarine pipeline according to the summarized flow characteristics and laws, so as to timely detect hidden dangers and disasters such as pipeline leakage and rupture, and control the losses within the minimum range.

[0022] The advantages of the present invention are:

[0023] The device can be used to measure the consequences of damage such as small hole leakage, pipeline rupture and even pipeline breakage; the pipeline of the device can be used as a gas pipeline, oil pipeline and oil-gas mixed pipeline for multiple experiments; the experimental device is simple to operate. After the damaged pipeline is installed, the opening and closing of the underwater switch can be controlled by the control cabinet. The error is small and it can truly reflect the state of the medium in the water after the pipeline is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 It is a schematic diagram of the overall structure of the experimental device according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic structural diagram of a replaceable pipeline according to an embodiment of the present invention;

[0027] Figure 3 A distribution diagram of switches and displays on the outer surface of a control cabinet of an experimental device according to an embodiment of the present invention;

[0028] Figure 4 A logic flow chart of an experimental method according to an embodiment of the present invention;

[0029] Figure 1 Among them, 101 is an oil storage tank, 102 is an oil pump, 103 is a manual switch for the oil pipeline, 104 is an air compressor, 105 is a manual switch for the gas pipeline, 106 is a three-way pipe, 107 is a transparent pipe, and 108 is a return pipe; 201 is an undamaged cross pipe pneumatic switch, 202 is a damaged cross pipe pneumatic switch, 203 is an undamaged cross pipe, 204 is a replaceable damaged cross pipe, 205 is an undamaged riser switch, 206 is a damaged riser pneumatic switch, 207 is an undamaged riser, and 208 is a replaceable damaged riser; 209 is a water tank, 210 is a drain valve, 211 is a drain pipe, 212 is an air hose junction box, 213 is a controller; 301 is a first flow sensor, 302 is a first pressure sensor, 303 is a second flow sensor, 304 is a second pressure sensor, 305 is a third flow sensor, 306 is a third pressure sensor, 307 is a fourth flow sensor, 308 is a fourth pressure sensor, 309 is a fifth flow sensor, 310 is a fifth pressure sensor, 311 is a sensor junction box, 312 is a display, and 313 is a computer;

[0030] Figure 3 Among them, 1 is the main switch button, 2 is the undamaged cross pipe pneumatic switch button, 3 is the damaged cross pipe pneumatic switch button, 4 is the undamaged riser switch button, 5 is the damaged riser pneumatic switch button, 6 is the first flow sensor reading display, 7 is the second flow sensor reading display, 8 is the third flow sensor reading display, 9 is the fourth flow sensor reading display, and 10 is the fifth flow sensor reading display. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1FIG. 1 is a schematic diagram of the overall structure of an experimental device according to an embodiment of the present invention. An underwater mixed pipeline damage consequence experimental device comprises three subsystems: a pipeline transport medium simulation system, an underwater damage simulation system and a data acquisition system.

[0033] Specifically, the pipeline medium simulation system described in this embodiment includes: an oil storage tank 101, an oil pump 102, an oil pipeline manual switch 103, an air compressor 104, a gas pipeline manual switch 105, a tee pipe 106, a transparent pipe 107 and a return pipe 108. The oil storage tank 101 is made of aluminum alloy, and is connected to an oil outlet pipe at the bottom, and the oil pump 102 and the oil pipeline manual switch 103 are connected to the oil outlet pipe in sequence, and the air compressor 104 on the gas pipeline is connected to the gas pipeline manual switch 105, and the oil outlet pipe and the gas pipeline meet at the tee pipe 106, and are connected to the transparent pipe 107 and the return pipe 108, and the outlet of the return pipe 108 is located above the oil storage tank 101, and the mixed medium enters the oil storage tank 101 from the outlet of the return pipe 108.

[0034] Specifically, the underwater damage simulation system described in this embodiment includes two parts: a damaged pipeline simulation subsystem and an underwater environment simulation subsystem, and the damaged pipeline simulation subsystem is located in the underwater environment simulation subsystem. The damaged pipeline simulation subsystem is divided into two parts: an underwater damaged horizontal pipe subsystem and an underwater damaged vertical pipe subsystem, wherein the underwater damaged horizontal pipe subsystem includes: an undamaged horizontal pipe 203, an undamaged horizontal pipe pneumatic switch 201, a damaged horizontal pipe pneumatic switch 202, and a replaceable damaged horizontal pipe 204 connected in sequence to form a closed loop, wherein the damaged horizontal pipe pneumatic switch 202 and the replaceable damaged horizontal pipe 204 are located on the horizontal section of the return pipe 108. The underwater damaged vertical pipe subsystem includes: an undamaged vertical pipe 207, an undamaged vertical pipe pneumatic switch 205, a damaged vertical pipe pneumatic switch 206, and a replaceable damaged vertical pipe 208 connected in sequence to form a closed loop, wherein the damaged vertical pipe pneumatic switch 206 and the replaceable damaged vertical pipe 208 are located on the vertical section of the return pipe 108. The underwater environment simulation subsystem includes: a water tank 209, a drain valve 210 and a drain pipe 211. The water inlet of the drain valve 210 is connected to the bottom of the water tank 209, and the water outlet of the drain valve 210 is connected to the drain pipe 211. The undamaged transverse pipe pneumatic switch 201, the damaged transverse pipe pneumatic switch 202, the undamaged vertical pipe pneumatic switch 205 and the damaged vertical pipe pneumatic switch 206 are concentrated in the air hose junction box 212 through air hoses, connected to the controller 213 through the air hose junction box 212, and the air source is provided by the air compressor 104. The underwater pneumatic switch is connected to the air compressor 104 through a hose and is powered by the air compressor 104, which can reduce the cumbersomeness of operating the underwater switch and realize the simultaneous opening and closing of multiple switches, reducing the impact of pressure and flow fluctuations on the experimental structure.

[0035] like Figure 2As shown, it is a schematic diagram of the structure of the replaceable pipeline of an embodiment of the present invention. The replaceable damaged transverse pipe 204 and the replaceable damaged riser 208 refer to submarine pipelines that have been damaged. The purpose of the two groups of control pipelines, the undamaged transverse pipe and the replaceable damaged transverse pipe, the undamaged riser and the replaceable damaged riser, is to make the flow of the medium inside the pipeline in a relatively stable stage through the undamaged transverse pipe and the undamaged riser, and to record the data of the undamaged stage for comparative analysis with the subsequent damage data. The replaceable damaged transverse pipe pipeline and the replaceable damaged riser pipeline are connected to other pipelines through flanges. The corresponding damaged pipes can be made according to the experimental requirements for replacement. At the same time, the direction of the pipeline can also be changed to simulate the damage consequences in different directions. The water tank material is fully transparent high-strength acrylic. There is a stainless steel plate for reinforcement in the middle part of the water tank, and a ruler for measuring the water depth in front of it.

[0036] Specifically, the data acquisition system described in this embodiment includes: a first flow sensor 301 for measuring the experimental oil flow, the first flow sensor 301 is connected to the oil outlet pipeline between the manual switch 103 and the tee 106 of the oil pipeline; a first pressure sensor 302 for measuring the experimental gas pressure, the first pressure sensor 302 is connected to the gas pipeline between the manual switch 105 and the tee 106 of the gas pipeline; a second flow sensor 303 and a second pressure sensor 304 are connected to the pipeline between the tee 106 and the transparent pipeline 107, the second flow sensor 303 and the second pressure sensor 304 constitute a first group of mixed medium measuring devices; in the water tank 209, a third flow sensor 305 and a third pressure sensor 306 are connected to the gas pipeline between the manual switch 105 and the tee 106 of the gas pipeline; 06 is connected to the return pipe 108 between the transparent pipe 107 and the damaged cross pipe pneumatic switch 202, and the third flow sensor 305 and the third pressure sensor 306 form a second group of mixed medium measuring devices; the fourth flow sensor 307 and the fourth pressure sensor 308 are connected to the return pipe 108 between the replaceable damaged cross pipe 204 and the damaged riser pneumatic switch 206, and the fourth flow sensor 307 and the fourth pressure sensor 308 form a third group of mixed medium measuring devices; the fifth flow sensor 309 and the fifth pressure sensor 310 are connected to the return pipe 108 after the replaceable damaged riser 208, and the fifth flow sensor 309 and the fifth pressure sensor 310 form a fourth group of mixed medium measuring devices. The computer 313 is connected to the controller and the display 312 respectively, and the signals of all sensors are transmitted to the display 312 through the sensor junction box 311 to display the relevant readings, and the computer 313 records the changes in relevant data.

[0037] As a preferred embodiment, the underwater mixed pipeline damage consequence experimental device of the present invention can be designed with a control cabinet to make the operation of the simulation test more convenient. The control cabinet is provided with: a controller 213 and a display 312, which can save space and manpower, and facilitate the user to operate and observe the experimental phenomenon. Figure 3 As shown, it is a distribution diagram of switches and displays on the outer surface of the control cabinet of the experimental device of the embodiment of the present invention. There are five flow sensor reading displays on the upper surface of the control cabinet, namely: the first flow sensor reading display 6, the second flow sensor reading display 7, the third flow sensor reading display 8, the fourth flow sensor reading display 9 and the fifth flow sensor reading display 10. There are five buttons on the lower surface of the control cabinet, namely: the main switch button 1, the undamaged cross pipe pneumatic switch button 2, the damaged cross pipe pneumatic switch button 3, the undamaged riser switch button 4 and the damaged riser pneumatic switch button 5, which are used to control the pneumatic switches of the underwater damage simulation system. In the non-test state, all pneumatic switches are in the closed state; after the main switch is turned on during the experiment, the undamaged cross pipe pneumatic switch 201 and the undamaged riser switch 205 are in the open state, and the damaged cross pipe pneumatic switch 202 and the damaged riser pneumatic switch 206 are in the closed state; the corresponding pneumatic switches can be opened or closed according to the requirements of the experiment.

[0038] like Figure 4 FIG. 1 is a logic flow chart of an experimental method according to an embodiment of the present invention. An underwater mixed pipeline damage simulation experimental method comprises the following steps:

[0039] S1, turn on the air compressor 104 and the controller 213, debug the pneumatic switch and the sensor, and connect the computer 313 and the controller 213;

[0040] S2. Fill water into the water tank 209 according to the test requirements, keep the water level at the required height, turn on the oil pump 102 and the manual switch 103 of the oil pipeline and the manual switch 105 of the gas pipeline to achieve normal flow of oil and gas in the pipeline;

[0041] S3. Adjust the oil output of the oil pump 102 according to the test requirements, record the reading of the first flow sensor 301, adjust the air output of the air compressor 104, and record the reading of the first pressure sensor 302;

[0042] S4, observe the transparent pipeline 107, wait for the mixed oil and gas to reach a stable state, and record the readings of the first, second, third and fourth groups of mixed medium measuring devices (i.e., the readings of sensors 303, 304, 305, 306, 307, 308, 309, 310) in sequence;

[0043] S5.1. Close the undamaged cross pipe switch 201, open the damaged cross pipe switch 202, observe the experimental phenomenon, and focus on recording the readings of the second and third groups of mixed medium measuring devices (i.e., the readings of sensors 306, 307, 308, and 309);

[0044] S5.2, close the undamaged riser switch 205, open the damaged riser switch 206, observe the experimental phenomenon, and focus on recording the readings of the third and fourth groups of mixed medium measuring devices (i.e., the readings of sensors 307, 308, 309, and 310);

[0045] S6, close the damaged horizontal pipe switch 202 and the damaged vertical pipe switch 206, open the undamaged horizontal pipe switch 201 and the undamaged vertical pipe switch 205, and let the mixed medium continue to circulate for a period of time to prevent water from entering the pipeline;

[0046] S7, turn off all pneumatic switches, disconnect the power supply, use oil-absorbing felt to absorb the residual oil in the water, open the drain valve 210, and drain the water in the water tank 209 through the drain pipe 211.

[0047] In the experimental steps, S5 is divided into two steps, 5.1 and 5.2, which are used to study the damage consequences of the horizontal pipe and the vertical pipe respectively. They can be carried out separately or simultaneously. By replacing the damaged pipe and repeating the above experimental steps, different consequences that may be caused by different damage parts can be explored.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Underwater mixed pipeline damage simulation experimental device, characterized in that: include: Pipeline transport medium simulation system, underwater damage simulation system and data acquisition system; The pipeline transport medium simulation system is used to simulate pipelines that transport oil, gas, and oil-gas mixtures; the underwater damage simulation system is used to simulate damage to pipelines that transport oil, gas, and oil-gas mixtures; the data acquisition system is used to collect test data under normal conditions and under conditions where the pipeline is damaged; The pipeline medium simulation system comprises: an oil storage tank (101), an oil pump (102), an oil pipeline manual switch (103), an air compressor (104), a gas pipeline manual switch (105), a tee pipe (106), a transparent pipe (107) and a return pipe (108); The oil storage tank (101) is made of aluminum alloy, and is connected to an oil outlet pipeline at the bottom. The oil outlet pipeline is connected to an oil pump (102) and an oil pipeline manual switch (103) in sequence. The air compressor (104) on the gas pipeline is connected to the gas pipeline manual switch (105). The oil outlet pipeline and the gas pipeline are joined at a tee pipe (106) and connected to a transparent pipe (107) and a return pipe (108). The outlet of the return pipe (108) is located above the oil storage tank (101). The underwater damage simulation system comprises: a damaged pipeline simulation subsystem and an underwater environment simulation subsystem. The damaged pipeline simulation subsystem is located in the underwater environment simulation subsystem. The damaged pipeline simulation subsystem is divided into two parts: an underwater damaged horizontal pipe subsystem and an underwater damaged riser subsystem. The underwater damaged cross pipe subsystem comprises: an undamaged cross pipe (203), an undamaged cross pipe pneumatic switch (201), a damaged cross pipe pneumatic switch (202) and a replaceable damaged cross pipe (204) which are sequentially connected to form a closed loop, wherein the damaged cross pipe pneumatic switch (202) and the replaceable damaged cross pipe (204) are located on a horizontal section of a return pipe (108); the underwater damaged riser subsystem comprises: an undamaged riser (207), an undamaged riser pneumatic switch (205), a damaged riser pneumatic switch (206) and a replaceable damaged riser (208) which are sequentially connected to form a closed loop, wherein the damaged riser pneumatic switch (206) and the replaceable damaged riser (208) are located on a horizontal section of a return pipe (108). (108); the underwater environment simulation subsystem comprises: a water tank (209), a drainage valve (210) and a drainage pipe (211); the water inlet of the drainage valve (210) is connected to the bottom of the water tank (209), and the water outlet of the drainage valve (210) is connected to the drainage pipe (211); the undamaged horizontal pipe pneumatic switch (201), the damaged horizontal pipe pneumatic switch (202), the undamaged vertical pipe pneumatic switch (205) and the damaged vertical pipe pneumatic switch (206) are concentrated in the air hose junction box (212) through the air hose junction box (212), and are connected to the controller (213) through the air hose junction box (212); the controller (213) is connected to the computer (313); The data acquisition system includes: a flow sensor for measuring the experimental oil flow, a pressure sensor for measuring the experimental gas pressure, and a mixed medium measuring device for measuring the oil-gas mixed medium; The data acquisition system comprises: a first flow sensor (301) for measuring the experimental oil flow, the first flow sensor (301) being connected to the oil outlet pipeline between the manual switch (103) and the tee (106) of the oil pipeline; a first pressure sensor (302) for measuring the experimental gas pressure, the first pressure sensor (302) being connected to the gas pipeline between the manual switch (105) and the tee (106) of the gas pipeline; a second flow sensor (303) and a second pressure sensor (304) being connected to the pipeline between the tee (106) and the transparent pipeline (107), the second flow sensor (303) and the second pressure sensor (304) forming a first group of mixed medium measuring devices; in the water tank (209), a third flow sensor (305) and a third pressure sensor (306) being connected to the return pipe between the transparent pipeline (107) and the damaged cross pipe pneumatic switch (202) The invention relates to a method for measuring a mixed medium in a liquid phase, wherein the first and second mixed medium measuring devices are connected to a return pipe (108) between the replaceable damaged horizontal pipe (204) and the damaged vertical pipe pneumatic switch (206), and the second mixed medium measuring device is formed. The fourth flow sensor (307) and the fourth pressure sensor (308) are connected to the return pipe (108) between the replaceable damaged horizontal pipe (204) and the damaged vertical pipe pneumatic switch (206), and the fourth flow sensor (307) and the fourth pressure sensor (308) are formed to form a third mixed medium measuring device. The fifth flow sensor (309) and the fifth pressure sensor (310) are connected to the return pipe (108) after the replaceable damaged vertical pipe (208), and the fifth flow sensor (309) and the fifth pressure sensor (310) are formed to form a fourth mixed medium measuring device. The signals of all sensors are transmitted to the display (312) through the sensor junction box (311) to display relevant readings, and the display (312) is connected to the computer (313).

2. The underwater mixed pipeline damage simulation experimental device according to claim 1 is characterized in that: The controller (213) and the display (312) are arranged in a control cabinet. Five flow sensor reading displays are arranged above the outer surface of the control cabinet, namely: a first flow sensor reading display (6), a second flow sensor reading display (7), a third flow sensor reading display (8), a fourth flow sensor reading display (9) and a fifth flow sensor reading display (10). Five buttons are arranged below the outer surface of the control cabinet, namely: a main switch button (1), an undamaged cross pipe pneumatic switch button (2), a damaged cross pipe pneumatic switch button (3), an undamaged vertical pipe switch button (4) and a damaged vertical pipe pneumatic switch button (5).

3. An underwater mixed pipeline damage simulation experimental method, characterized in that: The application of the simulation experiment device as claimed in claim 2 comprises the following steps: S1, turning on the air compressor (104) and the controller (213), debugging the pneumatic switch and the sensor, and connecting the computer (313) and the controller (213); S2. Fill the water tank (209) with water according to the test requirements, keep the water level at the required height, turn on the oil pump (102), the manual switch (103) of the oil pipeline, and the manual switch (105) of the gas pipeline to achieve normal flow of oil and gas in the pipeline; S3, adjusting the oil output of the oil pump (102) according to the test requirements, recording the reading of the first flow sensor (301), adjusting the air output of the air compressor (104), and recording the reading of the first pressure sensor (302); S4, observing the transparent pipeline (107), and when the mixed oil and gas reaches a stable state, sequentially recording the readings of the first, second, third and fourth groups of mixed medium measuring devices; S5.

1. Close the undamaged cross pipe switch (201), open the damaged cross pipe switch (202), observe the experimental phenomenon, and focus on recording the readings of the second and third groups of mixed medium measuring devices; S5.2, close the undamaged riser switch (205), open the damaged riser switch (206), observe the experimental phenomenon, and focus on recording the readings of the third and fourth groups of mixed medium measuring devices; S6, closing the damaged transverse pipe switch (202) and the damaged vertical pipe switch (206), opening the undamaged transverse pipe switch (201) and the undamaged vertical pipe switch (205), and allowing the mixed medium to continue to circulate for a period of time to prevent water from entering the pipeline; S7, turn off all pneumatic switches, disconnect the power supply, use oil absorption felt to absorb the residual oil in the water, open the drain valve (210), and drain the water in the water tank (209) through the drain pipe (211).

4. The underwater mixed pipeline damage simulation experimental method according to claim 3 is characterized in that: The flow characteristics and laws of the mixed medium when the underwater mixed pipeline is damaged are summarized based on the experimental data, and flow sensors and pressure sensors are arranged at key positions in the submarine pipeline based on the summarized flow characteristics and laws.

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