A multiphase flow erosion-corrosion test apparatus and method

Abstract

The application provides a multiphase flow erosion corrosion test device and method. In the multiphase flow erosion corrosion test device: a plurality of gas tanks are connected with a plurality of pressure regulating valves one by one, the plurality of pressure regulating valves are connected with a gas storage tank, the gas storage tank is connected with a pressure reducing valve, the pressure reducing valve is connected with an adjustable flow valve, the adjustable flow valve is connected with a first heater, the first heater is connected with a first ball valve; a second ball valve is connected with a second heater, the second heater is connected with a mud pump, the mud pump is connected with a solid-liquid mixing tank; a third ball valve is connected with a booster pump, the booster pump is connected with a third heater, the third heater is connected with a fourth ball valve and a fifth ball valve respectively, the fourth ball valve and the fifth ball valve are connected with an erosion cavity and a test pipeline one by one; the third ball valve is connected with the first ball valve and the second ball valve respectively.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipe erosion corrosion research, and particularly relates to a multiphase flow erosion corrosion test device and method. BACKGROUND

[0002] Erosion corrosion refers to a phenomenon that a material is subjected to solid particles or liquid drops at a certain angle and speed, and thus a material surface layer is peeled off. This phenomenon widely exists in various industrial processes, such as aviation equipment in the aviation industry, crushing machinery in the mining industry, pipe arrangement systems and boilers in the energy and chemical industry, and the like. Material erosion is a key reason for causing structural damage and failure. According to statistics, the loss caused by failure due to wear and tear is as high as hundreds of billions of dollars per year, and the loss caused by erosion accounts for more than 10%. Focusing on the oil and gas industry, erosion failure of pipe materials is a key factor leading to damage of oil pipes. In the process of oil and gas exploitation, almost all oil pipes inevitably suffer erosion damage caused by solid particles or liquid drops in the pipe. In harsh working conditions, sensitive parts of the pipe, such as elbows, valves, tees, and the like, are prone to pipe perforation or even rupture, thereby causing equipment failure and pipe leakage, which poses a serious threat to on-site operators and equipment, and causes damage to the surrounding environment.

[0003] Erosion corrosion is a complex phenomenon affected by different nonlinear factors, and is mainly related to factors such as fluid impact angle, fluid form, impact speed, target material properties, particle properties, environmental pressure and temperature, and the like. In the oil and gas industry, many flow equipment are subjected to erosion damage in harsh working conditions. For example, the downhole pipe string and the ground pipe manifold of the gas storage under the condition of "strong extraction and strong injection", the ground high-pressure pipe manifold in the "well factory" fracturing process, or the downhole key tools and wellbore in super-deep well drilling, and the like. The environmental working conditions, flow parameters and flow medium conditions of these equipment are quite different, and the existing erosion test research often only aims at the erosion behavior under specific multiphase flow (gas-solid or liquid-solid) conditions, and it is difficult to reproduce the complex erosion phenomenon under harsh conditions (such as high temperature, high pressure, and gas-solid-liquid three-phase flow). Therefore, it is difficult to use a single device to cover various actual complex working conditions, and thus it is difficult to guide on-site safety prevention and control. In addition, most of the existing erosion test devices use jet-type erosion to perform erosion test on a flat plate sample, and this test method cannot consider the influence of the geometry of the pipe on the erosion result. In view of this situation, although some scholars have proposed a loop-type erosion test device, the existing such device still has the problem that the pipe after erosion is difficult to further carry out post-processing of the test result.

[0004] In view of the existing problems, it is urgent to propose a high-temperature and high-pressure multiphase flow erosion corrosion test device and method which can reproduce different harsh working conditions, so as to truly simulate the erosion behavior of oil pipes under various complex working conditions. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a multiphase flow erosion test device and method to solve the problems of the prior art.

[0006] The technical scheme for solving the above technical problem is as follows: a multiphase flow erosion test device, comprising: a plurality of gas tanks, a plurality of pressure regulating valves, a gas storage tank, a pressure reducing valve, an adjustable flow valve, a first heater, a first ball valve, a second ball valve, a second heater, a mud pump, a solid-liquid mixing tank, a third ball valve, a booster pump, a third heater, a fourth ball valve, a fifth ball valve, an erosion chamber, and a test pipeline; the plurality of gas tanks are connected to the plurality of pressure regulating valves one by one through pipelines; the plurality of pressure regulating valves are connected to the gas storage tank through pipelines; the gas storage tank is connected to the pressure reducing valve through a pipeline; the pressure reducing valve is connected to the adjustable flow valve through a pipeline; the adjustable flow valve is connected to the first heater through a pipeline; the first heater is connected to the first ball valve through a pipeline; the second ball valve is connected to the second heater through a pipeline; the second heater is connected to the mud pump through a pipeline; the mud pump is connected to the solid-liquid mixing tank through a pipeline; the third ball valve is connected to the booster pump through a pipeline; the booster pump is connected to the third heater through a pipeline; the third heater is connected to the fourth ball valve and the fifth ball valve through pipelines; the fourth ball valve and the fifth ball valve are connected to the erosion chamber and the test pipeline one by one; and the third ball valve is connected to the first ball valve and the second ball valve through pipelines.

[0007] The beneficial effects of the technical scheme are as follows: two erosion test modes are provided, and the erosion medium can be subjected to erosion test through the combination of the erosion chamber and the test pipeline. The erosion test can cover different modes such as pure gas phase, liquid-solid two-phase, gas-liquid two-phase, and gas-solid-liquid three-phase, and can be carried out under complex high-temperature and high-pressure environments. The complex erosion phenomena of oil pipe fittings under various harsh working conditions can be reproduced, technical support for on-site erosion prevention and control is provided, and the safe service of oil pipe fittings prone to erosion in harsh environments is ensured.

[0008] Further, the gas storage tank is connected to a cyclone separator, and the cyclone separator is connected to the gas storage tank, the solid-liquid mixing tank, the erosion chamber, and the test pipeline through pipelines.

[0009] The beneficial effects of the above further technical scheme are as follows: the cyclone separator is provided to circulate the mixed gas into the gas storage tank and circulate the sand-carrying liquid and liquid into the solid-liquid mixing tank, which facilitates the recycling of the mixed gas, sand-carrying liquid, and liquid, reasonably utilizes resources, and reduces costs.

[0010] Further, the erosion cavity comprises a glass cover, a nozzle, a flat plate erosion sample, an adjustable angle erosion sample clamp, an erosion cavity outlet, and a camera, one end of the nozzle penetrates through the glass cover, one end of the nozzle and the camera are arranged correspondingly with the flat plate erosion sample, the other end of the nozzle is connected with the fourth ball valve through a pipeline, the flat plate erosion sample is installed on the adjustable angle erosion sample clamp, the camera is located outside the glass cover, and the erosion cavity outlet is connected with the glass cover.

[0011] The beneficial effects of the above further technical solutions are that the erosion medium is ejected from the nozzle, the flat plate erosion sample is installed on the adjustable angle erosion sample clamp, the erosion process is visualized by using the high-pressure-resistant aluminum-silicon glass cover, and the erosion particle speed can be measured by the camera. In the high-pressure erosion cavity, the erosion object is the flat plate erosion sample, and the impact angle can be adjusted, which facilitates the test personnel to construct an erosion mathematical model according to the test results.

[0012] Further, a plurality of erosion measuring points are arranged in the test pipeline, and the test pipeline comprises a straight pipe, an elbow, a manifold, a reducing pipe, and a blind flange, the straight pipe is connected with the elbow through a flange, the elbow is connected with a first end of the manifold through a flange, a second end of the manifold is connected with the reducing pipe through a flange, and a blind flange is installed at a third end of the manifold.

[0013] The beneficial effects of the above further technical solutions are that the test pipeline is composed of test elements such as a straight pipe, an elbow, a manifold, and a reducing pipe, and covers the main vulnerable pipe geometries, different pipe elements are connected through flanges, one end of the manifold can be sealed by a blind flange to form a blind tee, and the entire test pipeline can change the pipe shape by disassembling the flanges according to the test requirements. In the high-pressure pipeline, common petroleum pipe elements such as straight pipes, elbows, reducing pipes, and manifolds are arranged, the erosion of the field pipe elements can be tested in real life, and the erosion performance of the pipe elements under the actual working conditions of the field can be obtained.

[0014] Further, the plurality of erosion measuring points are grooves, erosion samples are arranged in the grooves, and ultrasonic probes are arranged outside the grooves.

[0015] The beneficial effects of the above further technical solutions are that a large number of erosion measuring points are arranged in the test pipeline, erosion samples are embedded in different test elements as erosion objects at the erosion measuring points, and the erosion samples can be taken out after the test for post-processing analysis. Ultrasonic probes are fixedly installed outside the erosion measuring points, and the wall thickness changes of the erosion measuring points can be monitored online and in situ during the erosion process.

[0016] Further, the plurality of gas tanks are carbon dioxide gas tanks, hydrogen sulfide gas tanks and methane gas tanks, the plurality of pressure regulating valves are first pressure regulating valves, second pressure regulating valves and third pressure regulating valves provided with pressure gauges, the carbon dioxide gas tanks are connected to the gas storage tank through the first pressure regulating valves, the hydrogen sulfide gas tanks are connected to the gas storage tank through the second pressure regulating valves, the methane gas tanks are connected to the gas storage tank through the third pressure regulating valves, the gas storage tank is provided with a pressure gauge, the solid-liquid mixing tank is provided with a water injection port and a sand injection port, and the water injection port and the sand injection port are both provided with needle valves.

[0017] The beneficial effects of the above further technical solutions are: the setting of the carbon dioxide gas tanks, the hydrogen sulfide gas tanks and the methane gas tanks facilitates covering different modes of erosion tests such as pure gas phase, liquid-solid two-phase, gas-liquid two-phase and gas-solid-liquid three-phase, and facilitates the introduction of different gases according to actual needs. The setting of the pressure regulating valves facilitates adjusting the proportion of different gases introduced according to actual needs, can reproduce complex erosion phenomena of oil pipe fittings under various harsh working conditions, provides technical support for on-site erosion prevention and control, and ensures the safe service of easily eroded oil pipe fittings in harsh environments.

[0018] Further, a first pressure gauge and a first flow meter are arranged on the pipeline between the adjustable flow valve and the first heater, a second flow meter and a second pressure gauge are arranged on the pipeline between the second heater and the mud pump, a third pressure gauge is arranged on the pipeline between the booster pump and the third heater, and a third flow meter is arranged on the pipeline between the third heater and the fourth ball valve and the fifth ball valve. The first heater, the second heater and the third heater are all provided with thermometers.

[0019] The beneficial effects of the above further technical solutions are: the setting of the pressure gauges, the flow meters and the thermometers facilitates real-time monitoring of the pressure, the flow and the temperature of the experiment, facilitates adjusting the pressure, the flow and the temperature according to actual needs, and improves the accuracy of the experimental results. It can reproduce complex erosion phenomena of oil pipe fittings under various harsh working conditions, provide technical support for on-site erosion prevention and control, and ensure the safe service of easily eroded oil pipe fittings in harsh environments.

[0020] Further, the plurality of pressure regulating valves are all connected to the gas storage tank through first one-way valves, a second one-way valve is arranged on the pipeline between the third ball valve and the first ball valve, and a third one-way valve is arranged on the pipeline between the third ball valve and the second ball valve.

[0021] The beneficial effects of the above further technical solutions are: the setting of the one-way valves prevents the backflow of gas, liquid and sand-carrying liquid, and improves the stability and reliability of the experimental device.

[0022] Further, the application also provides a multiphase flow erosion-corrosion test method, based on the multiphase flow erosion-corrosion test device of any one of the above, the multiphase flow erosion-corrosion test method comprising:

[0023] During the pure gas phase erosion-corrosion test:

[0024] Close the second ball valve, and open the first ball valve, the third ball valve, the fourth ball valve and the fifth ball valve;

[0025] Open the plurality of pressure regulating valves to charge the mixed gas into the gas storage tank;

[0026] Adjust the mixed gas pressure through the pressure reducing valve, and adjust the mixed gas flow through the adjustable flow valve;

[0027] Open the first heater to preheat the mixed gas;

[0028] Open the booster pump to pressurize the mixed gas;

[0029] Open the third heater to warm up the mixed gas;

[0030] The mixed gas enters the erosion chamber and the test pipeline to perform the erosion-corrosion test;

[0031] During the liquid-solid two-phase erosion-corrosion test:

[0032] Close the first ball valve, and open the second ball valve, the third ball valve, the fourth ball valve and the fifth ball valve;

[0033] Add the liquid and the erosion solid particles into the solid-liquid mixing tank respectively to form the sand-carrying liquid;

[0034] Open the mud pump to suck out the sand-carrying liquid in the solid-liquid mixing tank;

[0035] Open the second heater to preheat the sand-carrying liquid;

[0036] Open the booster pump to pressurize the sand-carrying liquid;

[0037] Open the third heater to warm up the sand-carrying liquid;

[0038] The sand-carrying liquid enters the erosion chamber and the test pipeline to perform the erosion-corrosion test;

[0039] During the gas-liquid two-phase erosion-corrosion test:

[0040] Open the first ball valve, the second ball valve, the third ball valve, the fourth ball valve and the fifth ball valve;

[0041] Add the liquid into the solid-liquid mixing tank;

[0042] Open the mud pump to suck out the liquid in the solid-liquid mixing tank;

[0043] The second heater is opened to preheat the liquid;

[0044] The plurality of pressure regulating valves are opened to fill the gas tank with mixed gas;

[0045] The pressure of the mixed gas is adjusted by the pressure reducing valve, and the flow of the mixed gas is adjusted by the adjustable flow valve;

[0046] The first heater is opened to preheat the mixed gas;

[0047] The booster pump is opened to pressurize the gas-liquid two-phase erosion medium;

[0048] The third heater is opened to heat the gas-liquid two-phase erosion medium;

[0049] The gas-liquid two-phase erosion medium enters the erosion chamber and the test pipeline to perform the erosion corrosion test;

[0050] When performing the gas-solid-liquid three-phase erosion corrosion test:

[0051] The first ball valve, the second ball valve, the third ball valve, the fourth ball valve, and the fifth ball valve are opened;

[0052] The liquid and the erosion solid particles are added to the solid-liquid mixing tank to form the sand-carrying liquid;

[0053] The mud pump is opened to suck out the sand-carrying liquid in the solid-liquid mixing tank;

[0054] The second heater is opened to preheat the sand-carrying liquid;

[0055] The plurality of pressure regulating valves are opened to fill the gas tank with mixed gas;

[0056] The pressure of the mixed gas is adjusted by the pressure reducing valve, and the flow of the mixed gas is adjusted by the adjustable flow valve;

[0057] The first heater is opened to preheat the mixed gas;

[0058] The booster pump is opened to pressurize the gas-liquid-solid three-phase erosion medium;

[0059] The third heater is opened to heat the gas-liquid-solid three-phase erosion medium;

[0060] The gas-liquid-solid three-phase erosion medium enters the erosion chamber and the test pipeline to perform the erosion corrosion test.

[0061] The beneficial effects of the technical scheme of the present application are that two kinds of erosion test modes are provided, and the erosion medium can pass through the erosion cavity and the test pipeline combination to carry out erosion test. Different modes of erosion test such as pure gas phase, liquid-solid two-phase, gas-liquid two-phase and gas-solid-liquid three-phase can be covered, and the test can be carried out under complex high temperature and high pressure environment, the complex erosion phenomenon of the oil pipe fitting under various harsh working conditions can be reproduced, technical support for on-site erosion prevention and control is provided, and the safe service of the oil pipe fitting prone to erosion under harsh environment is ensured.

[0062] Further, in the pure gas phase erosion corrosion test, the cyclone separator is opened, and the mixed gas is circulated and passed into the gas storage tank;

[0063] In the liquid-solid two-phase erosion corrosion test, the cyclone separator is opened, and the sand-carrying liquid is circulated and passed into the solid-liquid mixing tank;

[0064] In the gas-liquid two-phase erosion corrosion test, the cyclone separator is opened, and the mixed gas in the gas-liquid two-phase erosion medium is circulated and passed into the gas storage tank, and the liquid in the gas-liquid two-phase erosion medium is circulated and passed into the solid-liquid mixing tank;

[0065] In the gas-solid-liquid three-phase erosion corrosion test, the cyclone separator is opened, and the mixed gas in the gas-liquid-solid three-phase erosion medium is circulated and passed into the gas storage tank, and the sand-carrying liquid in the gas-liquid two-phase erosion medium is circulated and passed into the solid-liquid mixing tank.

[0066] The beneficial effects of the above further technical scheme are that the mixed gas is circulated and passed into the gas storage tank through the cyclone separator, and the sand-carrying liquid and the liquid are circulated and passed into the solid-liquid mixing tank through the cyclone separator, so that the mixed gas, the sand-carrying liquid and the liquid are conveniently recycled, resources are reasonably utilized, and the cost is reduced.

[0067] The advantages of the additional aspects of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0068] Figure 1 The structure schematic view of the multiphase flow erosion corrosion test device provided for the embodiment of the present application.

[0069] Figure 2 The structure schematic view of the erosion cavity provided for the embodiment of the present application.

[0070] Figure 3 The structure schematic view of the test pipeline provided for the embodiment of the present application.

[0071] Figure 4 The structure schematic view of the test pipeline provided for the embodiment of the present application.

[0072] Explanation of reference numerals: 1, carbon dioxide gas tank; 2, hydrogen sulfide gas tank; 3, methane gas tank; 4, first pressure regulating valve; 5, second pressure regulating valve; 6, third pressure regulating valve; 7, first check valve; 8, gas storage tank; 9, pressure reducing valve; 10, adjustable flow valve; 11, first pressure gauge; 12, first flow gauge; 13, first heater; 14, first ball valve; 15, second check valve; 16, third check valve; 17, second ball valve; 18, second heater; 19, second flow gauge; 20, second pressure gauge; 21, mud pump; 22, solid-liquid mixing tank; 23, water injection port; 24, sand injection port; 25, third ball valve; 26, booster pump; 27, third pressure gauge; 28, third heater; 29, third flow gauge; 30, fourth ball valve; 31, fifth ball valve; 32, erosion chamber; 33, test pipeline; 34, cyclone separator; 35, glass cover; 36, nozzle; 37, flat plate erosion test sample; 38, adjustable angle erosion test sample clamp; 39, erosion chamber outlet; 40, camera; 41, straight pipe; 42, elbow; 43, manifold; 44, reducing pipe; 45, flange; 46, blind flange; 47, erosion test sample; 48, ultrasonic probe. DETAILED DESCRIPTION

[0073] The principles and features of the present application are described below in conjunction with the accompanying drawings, in which the examples are used to explain the present application and are not intended to limit the scope of the present application.

[0074] As Figures 1 to 4As shown in the figure, the embodiment of the present application provides a kind of multiphase flow erosion test device, comprising: multiple gas tanks, multiple pressure regulating valves, gas storage tank 8, pressure reducing valve 9, adjustable flow valve 10, first heater 13, first ball valve 14, second ball valve 17, second heater 18, mud pump 21, solid-liquid mixing tank 22, third ball valve 25, booster pump 26, third heater 28, fourth ball valve 30, fifth ball valve 31, erosion chamber 32, test pipeline 33, multiple gas tanks are connected with multiple pressure regulating valves by pipeline one by one, multiple pressure regulating valves are connected with gas storage tank 8 by pipeline, gas storage tank 8 is connected with pressure reducing valve 9 by pipeline, pressure reducing valve 9 is connected with adjustable flow valve 10 by pipeline, adjustable flow valve 10 is connected with first heater 13 by pipeline, first heater 13 is connected with first ball valve 14 by pipeline;Second ball valve 17 is connected with second heater 18 by pipeline, second heater 18 is connected with mud pump 21 by pipeline, mud pump 21 is connected with solid-liquid mixing tank 22 by pipeline;Third ball valve 25 is connected with booster pump 26 by pipeline, booster pump 26 is connected with third heater 28 by pipeline, third heater 28 is connected with fourth ball valve 30 and fifth ball valve 31 respectively by pipeline, fourth ball valve 30 and fifth ball valve 31 are connected with erosion chamber 32 and test pipeline 33 one by one respectively;Third ball valve 25 is connected with first ball valve 14 and second ball valve 17 by pipeline respectively.

[0075] The beneficial effects of the technical scheme of the present application are: two kinds of erosion test modes are set, and the erosion medium can be subjected to erosion test through the combination of the erosion chamber and the test pipeline. The erosion test of different modes such as pure gas phase, liquid-solid two-phase, gas-liquid two-phase and gas-solid-liquid three-phase can be covered, and the test can be carried out under complex high temperature and high pressure environment. The complex erosion phenomenon of oil pipe fittings under various harsh working conditions can be reproduced, technical support for on-site erosion prevention and control is provided, and the safe service of oil pipe fittings prone to erosion in harsh environment is ensured.

[0076] As shown in the figure, Figures 1 to 4 Further, the gas storage tank 8 is connected with a cyclone separator 34, and the cyclone separator 34 is connected with the gas storage tank 8, the solid-liquid mixing tank 22, the erosion chamber 32 and the test pipeline 33 respectively by pipelines.

[0077] The beneficial effects of the above-mentioned further technical scheme are: the setting of the cyclone separator circulates the mixed gas into the gas storage tank, and circulates the sand-carrying liquid and liquid into the solid-liquid mixing tank, which facilitates the recycling of the mixed gas, sand-carrying liquid and liquid, reasonably utilizes resources, and reduces costs.

[0078] As shown in the figure, Figures 1 to 4As shown, further, the erosion cavity 32 comprises: a glass cover 35, a nozzle 36, a flat plate erosion sample 37, an adjustable angle erosion sample clamp 38, an erosion cavity outlet 39, a camera 40, one end of the nozzle 36 penetrates the glass cover 35, one end of the nozzle 36 and the camera 40 are arranged corresponding to the flat plate erosion sample 37, the other end of the nozzle 36 is connected with the fourth ball valve 30 through a pipeline, the flat plate erosion sample 37 is installed on the adjustable angle erosion sample clamp 38, the camera 40 is located outside the glass cover 35, and the erosion cavity outlet 39 is connected with the glass cover 35.

[0079] The beneficial effects of the above further technical solutions are: the erosion medium is ejected from the nozzle, the flat plate erosion sample is installed on the adjustable angle erosion sample clamp, the erosion process is visualized by using the high-pressure-resistant aluminum-silicon glass cover, and the erosion particle speed can be measured by the camera. In the high-pressure erosion cavity, the erosion object is the flat plate erosion sample, and the impact angle can be adjusted, so that the test personnel can construct an erosion mathematical model according to the test results.

[0080] As shown in the figure, Figures 1 to 4 Further, a plurality of erosion measuring points are arranged in the test pipeline, and the test pipeline 33 comprises: a straight pipe 41, an elbow 42, a manifold 43, a reducing pipe 44, and a blind flange 46, the straight pipe 41 is connected with the elbow 42 through a flange 45, the elbow 42 is connected with a first end of the manifold 43 through a flange 45, a second end of the manifold 43 is connected with the reducing pipe 44 through a flange 45, and the blind flange 46 is installed at a third end of the manifold 43.

[0081] The beneficial effects of the above further technical solutions are: the test pipeline is composed of test elements such as straight pipes, elbows, manifolds, reducing pipes, etc., and covers the main geometric shapes of vulnerable pipe fittings. Different pipe fittings are connected by flanges, one end of the manifold can be sealed by a blind flange to form a blind tee, and the entire test pipeline can change the shape of the pipe fitting by disassembling the flanges according to the test requirements. In the high-pressure pipeline, common petroleum pipe elements such as straight pipes, elbows, reducing pipes, and manifolds are arranged, which can test the erosion of the field pipe fittings and obtain the erosion performance of the pipe fittings under the actual working conditions.

[0082] As shown in the figure, Figures 1 to 4 Further, the plurality of erosion measuring points are grooves, erosion samples 47 are arranged in the grooves, and ultrasonic probes 48 are arranged outside the grooves.

[0083] The beneficial effects of the further technical scheme are that a large number of erosion measurement points are arranged in the test pipeline, at the erosion measurement points, the erosion samples are embedded in different test elements as erosion objects, and the erosion samples can be taken out after the test to facilitate post-processing analysis. An ultrasonic probe is fixedly installed outside the erosion measurement points, and the wall thickness change of the erosion measurement points can be monitored on-line and in-situ during the erosion process.

[0084] The ultrasonic probe arranged outside the erosion measurement points can be replaced by other damage-free measurement detection elements, such as a magnetic flux leakage probe, an electromagnetic ultrasonic probe, and a magnetic memory probe.

[0085] As shown in Figures 1 to 4 , further, the plurality of gas tanks are carbon dioxide gas tanks 1, hydrogen sulfide gas tanks 2, and methane gas tanks 3, the plurality of pressure regulating valves are first pressure regulating valves 4, second pressure regulating valves 5, and third pressure regulating valves 6 provided with pressure gauges, the carbon dioxide gas tanks 1 are connected to the gas storage tanks 8 through the first pressure regulating valves 4, the hydrogen sulfide gas tanks 2 are connected to the gas storage tanks 8 through the second pressure regulating valves 5, the methane gas tanks 3 are connected to the gas storage tanks 8 through the third pressure regulating valves 6, the gas storage tanks 8 are provided with pressure gauges, the solid-liquid mixing tanks 22 are provided with water injection ports 23 and sand injection ports 24, and the water injection ports 23 and the sand injection ports 24 are provided with needle valves.

[0086] The beneficial effects of the further technical scheme are that the carbon dioxide gas tanks, the hydrogen sulfide gas tanks, and the methane gas tanks are arranged to facilitate erosion tests of different modes such as pure gas phase, liquid-solid two-phase, gas-liquid two-phase, and gas-solid-liquid three-phase, and to facilitate the introduction of different gases according to actual needs. The pressure regulating valves are arranged to facilitate the adjustment of the proportions of different gases introduced according to actual needs, to reproduce complex erosion phenomena of oil pipe fittings under various harsh working conditions, to provide technical support for on-site erosion prevention and control, and to ensure the safe service of easily eroded oil pipe fittings in harsh environments.

[0087] As shown in Figures 1 to 4 , further, a first pressure gauge 11 and a first flow gauge 12 are arranged on the pipeline between the adjustable flow valve 10 and the first heater 13, a second flow gauge 19 and a second pressure gauge 20 are arranged on the pipeline between the second heater 18 and the mud pump 21, a third pressure gauge 27 is arranged on the pipeline between the booster pump 26 and the third heater 28, a third flow gauge 29 is arranged on the pipeline between the third heater 28 and the fourth ball valve 30 and the fifth ball valve 31, and the first heater 13, the second heater 18, and the third heater 28 are each provided with a thermometer.

[0088] The beneficial effects of the further technical scheme are that the pressure gauge, the flow gauge and the thermometer are arranged to facilitate real-time monitoring of the pressure, the flow and the temperature of the experiment, facilitate adjustment of the pressure, the flow and the temperature according to actual needs, and improve the accuracy of the experimental results. The complex erosion phenomenon of the oil pipe fitting under various harsh working conditions can be reproduced, technical support is provided for on-site erosion prevention and control, and the safe service of the oil pipe fitting prone to erosion in a harsh environment is ensured.

[0089] As shown in Figures 1 to 4 Further, the plurality of pressure regulating valves are connected with the gas storage tank 8 through the first one-way valve 7, the second one-way valve 15 is arranged on the pipeline between the third ball valve 25 and the first ball valve 14, and the third one-way valve 16 is arranged on the pipeline between the third ball valve 25 and the second ball valve 17.

[0090] The beneficial effects of the further technical scheme are that the one-way valve is arranged to prevent backflow of gas, liquid and sand-carrying liquid, and improve the stability and reliability of the experimental device.

[0091] 1. The multiphase flow erosion corrosion test device provided by the application can be a high-temperature and high-pressure multiphase flow erosion corrosion test device, comprising: a CO2 tank (carbon dioxide tank 1), an H2S tank (hydrogen sulfide tank 2), a CH4 tank (methane tank 3), a pressure regulating valve one (first pressure regulating valve 4) with a pressure gauge, a pressure regulating valve two (second pressure regulating valve 5) with a pressure gauge, a pressure regulating valve three (third pressure regulating valve 6) with a pressure gauge, a one-way valve one (first one-way valve 7), a high-pressure gas storage tank (gas storage tank 8) with a pressure gauge, a pressure reducing valve 9, an adjustable flow valve 10, a pressure gauge one (first pressure gauge 11), a flow gauge one (first flow gauge 12), a heater one (first heater 13) with a thermometer, a ball valve one (first ball valve 14), a one-way valve two (second one-way valve 15), a one-way valve three (third one-way valve 16), a ball valve two (second ball valve 17), a heater two (second heater 18) with a thermometer, a flow gauge two (second flow gauge 19), a pressure gauge two (second pressure gauge 20), a high-pressure mud pump (mud pump 21), a high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22), a water inlet 23 with a high-pressure needle valve, a sand inlet 24 with a high-pressure needle valve, a ball valve three (third ball valve 25), a booster pump 26, a pressure gauge three (third pressure gauge 27), a heater three (third heater 28) with a thermometer, a flow gauge three (third flow gauge 29), a ball valve four (fourth ball valve 30), a ball valve five (fifth ball valve 31), a high-pressure erosion chamber (erosion chamber 32), a high-pressure pipeline (test pipeline 33), and a cyclone separator 34.

[0092] 2. The application provides two erosion (erosion corrosion) test modes, and the erosion medium can be subjected to erosion test through the combination of the high-pressure erosion chamber (erosion chamber 32) and the high-pressure pipeline (test pipeline 33).

[0093] 3. The high-pressure erosion cavity is composed of a high-pressure-resistant aluminum-silicon glass cover (glass cover 35), a nozzle 36, a flat plate erosion sample 37, an adjustable angle erosion sample clamp 38, an erosion cavity outlet 39, and a high-speed camera (camera 40). The erosion medium is ejected from the nozzle 36, the flat plate erosion sample 37 is installed on the adjustable angle erosion sample clamp 38, the erosion process is visualized by using the high-pressure-resistant aluminum-silicon glass cover, and the erosion particle speed can be measured by the high-speed camera.

[0094] 4. The high-pressure pipeline (test pipeline 33) is composed of a straight pipe 41, an elbow 42, a manifold 43, a reducing pipe 44, and other test elements, covers the main vulnerable pipe geometry, and different pipe elements are connected by high-pressure flanges (flange 45). The end of the manifold can be sealed by a blind flange 46 to form a blind tee joint. The entire high-pressure pipeline (test pipeline 33) can change the pipe shape by disassembling the flanges according to the test requirements.

[0095] 5. A large number of erosion measurement points are arranged in the high-pressure pipeline (test pipeline 33). At the erosion measurement points, the erosion sample 47 is embedded in different test elements as the erosion object, which can be taken out after the test for post-processing analysis.

[0096] 6. An ultrasonic probe 48 is fixedly installed outside the erosion measurement point, which can monitor the wall thickness change of the erosion measurement point position in situ during the erosion process.

[0097] In addition, the application also provides a multiphase flow erosion-corrosion test method based on the multiphase flow erosion-corrosion test device of any one of the above.

[0098] When the pure gas phase erosion-corrosion test is performed:

[0099] The second ball valve is closed, and the first ball valve, the third ball valve, the fourth ball valve, and the fifth ball valve are opened.

[0100] The plurality of pressure regulating valves are opened, and the mixed gas is filled into the gas storage tank;

[0101] The pressure of the mixed gas is adjusted by the pressure reducing valve, and the flow of the mixed gas is adjusted by the adjustable flow valve.

[0102] The first heater is opened to preheat the mixed gas;

[0103] The booster pump is opened to pressurize the mixed gas;

[0104] The third heater is opened to warm up the mixed gas;

[0105] The mixed gas enters the erosion cavity and the test pipeline to perform the erosion-corrosion test.

[0106] When the liquid-solid two-phase erosion-corrosion test is performed:

[0107] Close the first ball valve, open the second ball valve, the third ball valve, the fourth ball valve and the fifth ball valve;

[0108] Add liquid and erosion solid particles into the solid-liquid mixing tank respectively to form the sand-carrying fluid;

[0109] Open the mud pump to suck out the sand-carrying fluid in the solid-liquid mixing tank;

[0110] Open the second heater to preheat the sand-carrying fluid;

[0111] Open the booster pump to pressurize the sand-carrying fluid;

[0112] Open the third heater to warm up the sand-carrying fluid;

[0113] The sand-carrying fluid enters the erosion chamber and the test pipeline to perform the erosion corrosion test;

[0114] When the gas-liquid two-phase erosion corrosion test is performed:

[0115] Open the first ball valve, the second ball valve, the third ball valve, the fourth ball valve and the fifth ball valve;

[0116] Add liquid into the solid-liquid mixing tank;

[0117] Open the mud pump to suck out the liquid in the solid-liquid mixing tank;

[0118] Open the second heater to preheat the liquid;

[0119] Open a plurality of pressure regulating valves to fill the mixed gas into the gas storage tank;

[0120] Adjust the pressure of the mixed gas through the pressure reducing valve and adjust the flow of the mixed gas through the adjustable flow valve;

[0121] Open the first heater to preheat the mixed gas;

[0122] Open the booster pump to pressurize the gas-liquid two-phase erosion medium;

[0123] Open the third heater to warm up the gas-liquid two-phase erosion medium;

[0124] The gas-liquid two-phase erosion medium enters the erosion chamber and the test pipeline to perform the erosion corrosion test;

[0125] When the gas-solid-liquid three-phase erosion corrosion test is performed:

[0126] Open the first ball valve, the second ball valve, the third ball valve, the fourth ball valve and the fifth ball valve;

[0127] Add liquid and erosion solid particles into the solid-liquid mixing tank respectively to form the sand-carrying fluid;

[0128] Opening the mud pump, the sand-carrying liquid in the solid-liquid mixing tank is sucked out;

[0129] Opening the second heater, the sand-carrying liquid is preheated;

[0130] Opening the plurality of pressure regulating valves, the mixed gas is filled into the gas storage tank;

[0131] The pressure of the mixed gas is adjusted through the pressure reducing valve, and the flow of the mixed gas is adjusted through the adjustable flow valve;

[0132] Opening the first heater, the mixed gas is preheated;

[0133] Opening the booster pump, the gas-liquid-solid three-phase erosion medium is pressurized;

[0134] Opening the third heater, the gas-liquid-solid three-phase erosion medium is heated;

[0135] The gas-liquid-solid three-phase erosion medium enters the erosion chamber and the test pipeline to perform the erosion corrosion test.

[0136] The beneficial effects of the technical scheme of the present application are: two kinds of erosion test modes are set, and the erosion medium can be combined through the erosion chamber and the test pipeline to perform the erosion test. Different modes of erosion test such as pure gas phase, liquid-solid two-phase, gas-liquid two-phase, and gas-solid-liquid three-phase can be covered, and the test can be carried out in a complex high temperature and high pressure environment. The complex erosion phenomenon of the oil pipe fitting under multiple harsh working conditions can be reproduced, technical support for on-site erosion prevention and control is provided, and the safe service of the oil pipe fitting prone to erosion in harsh environments is ensured.

[0137] Further, in the pure gas phase erosion corrosion test: opening the cyclone separator, the mixed gas is circulated into the gas storage tank;

[0138] In the liquid-solid two-phase erosion corrosion test: opening the cyclone separator, the sand-carrying liquid is circulated into the solid-liquid mixing tank;

[0139] In the gas-liquid two-phase erosion corrosion test: opening the cyclone separator, the mixed gas in the gas-liquid two-phase erosion medium is circulated into the gas storage tank, and the liquid in the gas-liquid two-phase erosion medium is circulated into the solid-liquid mixing tank;

[0140] In the gas-solid-liquid three-phase erosion corrosion test: opening the cyclone separator, the mixed gas in the gas-liquid-solid three-phase erosion medium is circulated into the gas storage tank, and the sand-carrying liquid in the gas-liquid two-phase erosion medium is circulated into the solid-liquid mixing tank.

[0141] The beneficial effects of the above further technical scheme are: the mixed gas is circulated into the gas storage tank through the cyclone separator, and the sand-carrying liquid and the liquid are circulated into the solid-liquid mixing tank through the cyclone separator, which facilitates the recycling of the mixed gas, the sand-carrying liquid and the liquid, reasonably utilizes resources, and reduces costs.

[0142] The present application can carry out erosion tests under various flow patterns (pure gas phase, liquid-solid two-phase, gas-liquid two-phase, and gas-liquid-solid three-phase, etc.) for different service conditions of petroleum pipe fittings, and the specific implementation steps of different modes are as follows:

[0143] a. Pure gas phase erosion:

[0144] 1) Close ball valve two (second ball valve 17), and open ball valve one (first ball valve 14), ball valve three (third ball valve 25), ball valve four (fourth ball valve 30), and ball valve five (fifth ball valve 31) respectively;

[0145] 2) Open pressure regulating valve one (first pressure regulating valve 4), pressure regulating valve two (second pressure regulating valve 5), and pressure regulating valve three (third pressure regulating valve 6) respectively, and fill mixed gas into the high-pressure gas storage tank (gas storage tank 8) according to a preset ratio;

[0146] 3) Open the pressure reducing valve 9, and adjust the adjustable flow valve 10, so that the gas pressure and flow information in the pipe can be obtained through the first pressure gauge (first pressure gauge 11) and the first flowmeter (first flowmeter 12);

[0147] 4) Open the first heater (first heater 13) to preheat the gas in the pipe;

[0148] 6) Open and adjust the booster pump 26 to pressurize the mixed gas, and the pressure is indicated by the third pressure gauge (third pressure gauge 27);

[0149] 7) Open the third heater (third heater 28) to heat the mixed gas in the pipe;

[0150] 8) The mixed gas enters the high-pressure erosion chamber (erosion chamber 32) and the high-pressure combined pipeline (test pipeline 33) respectively to carry out erosion test;

[0151] 9) After the gas in the pipe passes through the test area, it passes through the cyclone separator 34 and enters the high-pressure gas storage tank (gas storage tank 8) to form a pipeline circulation.

[0152] b. Liquid-solid two-phase erosion:

[0153] 1) Close the first ball valve (first ball valve 14), and open the second ball valve (second ball valve 17), the third ball valve (third ball valve 25), the fourth ball valve (fourth ball valve 30), and the fifth ball valve (fifth ball valve 31);

[0154] 2) Fill water into the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) through the water inlet 23;

[0155] 3) Add erosion solid particles to the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) through the sand inlet 24 according to the test proportion requirement and mix thoroughly;

[0156] 4) Open the high-pressure mud pump (mud pump 21) to pump the sand-carrying liquid from the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22), and the flow rate and pressure are read from flow meter two (second flow meter 19) and pressure gauge two (second pressure gauge 20) respectively;

[0157] 5) Open the second heater (second heater 18) to preheat the sand-carrying liquid in the pipe;

[0158] 6) Open and adjust the booster pump 26 to pressurize the sand-carrying liquid in the pipe, and the pressure is indicated by pressure gauge three (third pressure gauge 27);

[0159] 7) Open the third heater (third heater 28) to heat the sand-carrying liquid in the pipe;

[0160] 8) The sand-carrying liquid enters the high-pressure erosion chamber (erosion chamber 32) and the high-pressure combined pipeline (test pipeline 33) respectively to perform erosion test;

[0161] 9) After passing through the test area, the sand-carrying liquid passes through the cyclone separator 34 and enters the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) to form a pipeline circulation.

[0162] c, gas-liquid two-phase erosion;

[0163] 1) Open ball valve one (first ball valve 14), ball valve two (second ball valve 17), ball valve three (third ball valve 25), ball valve four (fourth ball valve 30), and ball valve five (fifth ball valve 31) respectively;

[0164] 2) Fill the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) with water through the water inlet (23);

[0165] 3) Open the high-pressure mud pump (mud pump 21) to pump the liquid from the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22), and the flow rate and pressure are read from flow meter two (second flow meter 19) and pressure gauge two (second pressure gauge 20) respectively;

[0166] 4) Open the second heater (second heater 18) to preheat the liquid in the pipe;

[0167] 5) Open the first pressure regulating valve (first pressure regulating valve 4), the second pressure regulating valve (second pressure regulating valve 5), and the third pressure regulating valve (third pressure regulating valve 6) respectively to fill the high-pressure gas tank (gas tank 8) with mixed gas;

[0168] 6) Open the pressure reducing valve 9 and adjust the adjustable flow valve 10, and the gas pressure and flow rate information in the pipe can be obtained through the first pressure gauge (first pressure gauge 11) and the first flow meter (first flow meter 12);

[0169] 7) Turn on heater one (first heater 13) to pre-heat the gas in the pipe;

[0170] 8) Turn on and adjust the pressure of the booster pump 26 to pressurize the gas-liquid two-phase erosion medium in the pipe, and the pressure is shown by pressure gauge three (third pressure gauge 27);

[0171] 9) Turn on heater three (third heater 28) to heat the gas-liquid two-phase erosion medium in the pipe;

[0172] 10) The gas-liquid two-phase erosion medium in the pipe enters the high-pressure erosion chamber (erosion chamber 32) and the high-pressure combined pipeline (test pipeline 33) respectively to conduct erosion test;

[0173] 11) After the gas-liquid two-phase erosion medium passes through the test area, it passes through the cyclone separator 34, the gas enters the high-pressure gas storage tank (gas storage tank 8), and the liquid enters the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) to form a pipeline circulation.

[0174] d, gas-solid-liquid three-phase erosion;

[0175] 1) Open ball valve one (first ball valve 14), ball valve two (second ball valve 17), ball valve three (third ball valve 25), ball valve four (fourth ball valve 30), and ball valve five (fifth ball valve 31) respectively;

[0176] 2) Fill the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) with water through the water inlet 23;

[0177] 3) Add erosion solid particles to the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) through the sand inlet 24 according to the test proportion requirement and mix thoroughly;

[0178] 4) Open the high-pressure mud pump (mud pump 21) to suck the sand-carrying liquid from the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22), and the flow rate and pressure are read from the flow meter two (second flow meter 19) and the pressure gauge two (second pressure gauge 20) respectively;

[0179] 5) Turn on heater two (second heater 18) to pre-heat the sand-carrying liquid in the pipe;

[0180] 6) Open pressure regulating valve one (first pressure regulating valve 4), pressure regulating valve two (second pressure regulating valve 5), and pressure regulating valve three (third pressure regulating valve 6) respectively to fill the high-pressure gas storage tank (gas storage tank 8) with mixed gas;

[0181] 7) Open the pressure reducing valve 9 and adjust the adjustable flow valve 10, and the gas pressure and flow rate information in the pipe can be obtained through the pressure gauge one (first pressure gauge 11) and the flow meter one (first flow meter 12);

[0182] 8) open the heater one (first heater 13) to preheat the gas in the pipe;

[0183] 9) open and adjust the booster pump 26 to pressurize the gas-liquid-solid three-phase erosion medium in the pipe, and the pressure is shown by the pressure gauge three (third pressure gauge 27);

[0184] 10) open the heater three (third heater 28) to heat the gas-liquid-solid three-phase erosion medium in the pipe;

[0185] 11) the gas-liquid-solid three-phase erosion medium in the pipe enters the high-pressure erosion chamber (erosion chamber 32) and the high-pressure combined pipeline (test pipeline 33) respectively to carry out erosion test;

[0186] 12) after the gas-liquid-solid three-phase erosion medium passes through the test area, it passes through the cyclone separator 34, the gas enters the high-pressure gas tank (gas tank 8), and the sand-carrying liquid enters the high-pressure solid-liquid mixing tank (solid-liquid mixing tank 22) to form a pipeline circulation.

[0187] The adjustable parameters of the test include: gas composition, gas flow rate, liquid flow rate, particle concentration, particle size, operating pressure, ambient temperature, impact angle, sample material, etc.

[0188] The existing erosion test device can generally only carry out erosion test under specific multiphase flow conditions, and the multiphase flow erosion test device provided by the present application can carry out erosion test in different modes such as pure gas phase, liquid-solid two-phase, gas-liquid two-phase and gas-solid-liquid three-phase by adopting different test procedures. In addition, the device can carry out erosion test under high temperature and high pressure complex environment to reproduce the actual harsh working conditions. The present application sets two kinds of erosion test modes, and the erosion medium can be combined through the high-pressure erosion chamber (erosion chamber) and the high-pressure pipeline (test pipeline) to carry out erosion test. In the high-pressure erosion chamber, the erosion object is a flat plate erosion sample, and the impact angle can be adjusted, which is convenient for test personnel to construct an erosion mathematical model according to the test results. In the high-pressure pipeline, common petroleum pipe elements such as straight pipes, elbows, reducers and manifolds are provided, which can test the erosion of on-site pipe fittings and obtain the erosion performance of pipe fittings under actual working conditions.

[0189] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A multiphase flow erosion corrosion testing device, characterized in that, include: Multiple gas tanks, multiple pressure regulating valves, a gas storage tank (8), a pressure reducing valve (9), an adjustable flow valve (10), a first heater (13), a first ball valve (14), a second ball valve (17), a second heater (18), a mud pump (21), a solid-liquid mixing tank (22), a third ball valve (25), a booster pump (26), a third heater (28), a fourth ball valve (30), a fifth ball valve (31), an erosion chamber (32), and a test pipeline (33). Multiple gas tanks are connected to multiple pressure regulating valves via pipelines. Multiple pressure regulating valves are connected to the gas storage tank (8) via pipelines. The gas storage tank (8) is connected to the pressure reducing valve (9) via pipelines. The pressure reducing valve (9) is connected to the adjustable flow valve (10) via pipelines. The adjustable flow valve (10) is connected to the first heater (13) via pipelines. The first heater (13) is connected to... The first ball valve (14) is connected to the second ball valve (17) via a pipeline; the second ball valve (17) is connected to the second heater (18) via a pipeline, the second heater (18) is connected to the mud pump (21) via a pipeline, the mud pump (21) is connected to the solid-liquid mixing tank (22) via a pipeline; the third ball valve (25) is connected to the booster pump (26) via a pipeline, the booster pump (26) is connected to the third heater (28) via a pipeline, the third heater (28) is connected to the fourth ball valve (30) and the fifth ball valve (31) via pipelines respectively, the fourth ball valve (30) and the fifth ball valve (31) are connected one-to-one with the erosion chamber (32) and the test pipeline (33); the third ball valve (25) is connected to the first ball valve (14) and the second ball valve (17) via pipelines respectively.

2. The multiphase flow erosion corrosion testing apparatus according to claim 1, characterized in that, The gas storage tank (8) is connected to a cyclone separator (34), which is connected to the gas storage tank (8), the solid-liquid mixing tank (22), the erosion chamber (32) and the test pipeline (33) through pipelines.

3. The multiphase flow erosion corrosion testing apparatus according to claim 1, characterized in that, The erosion chamber (32) includes: a glass cover (35), a nozzle (36), a flat erosion sample (37), an adjustable angle erosion sample holder (38), an erosion chamber outlet (39), and a camera (40). One end of the nozzle (36) passes through the glass cover (35). One end of the nozzle (36) and the camera (40) are correspondingly arranged with the flat erosion sample (37). The other end of the nozzle (36) is connected to the fourth ball valve (30) through a pipeline. The flat erosion sample (37) is installed on the adjustable angle erosion sample holder (38). The camera (40) is located outside the glass cover (35). The erosion chamber outlet (39) is connected to the glass cover (35).

4. The multiphase flow erosion corrosion testing apparatus according to claim 1, characterized in that, The test pipeline is provided with multiple erosion measuring points. The test pipeline (33) includes: a straight pipe (41), an elbow (42), a manifold (43), a reducer (44), and a blind flange (46). The straight pipe is connected to the elbow (42) through a flange. The elbow (42) is connected to the first end of the manifold (43) through a flange. The second end of the manifold (43) is connected to the reducer (44) through a flange. The blind flange (46) is installed at the third end of the manifold (43).

5. The multiphase flow erosion corrosion testing apparatus according to claim 4, characterized in that, Multiple erosion measuring points are grooves, and erosion samples (47) are placed in the grooves. An ultrasonic probe (48) is placed on the outside of the grooves.

6. The multiphase flow erosion corrosion testing apparatus according to claim 1, characterized in that, The multiple gas cylinders are carbon dioxide cylinder (1), hydrogen sulfide cylinder (2) and methane cylinder (3). The multiple pressure regulating valves are a first pressure regulating valve (4), a second pressure regulating valve (5) and a third pressure regulating valve (6) with built-in pressure gauges. The carbon dioxide cylinder (1) is connected to the gas storage tank (8) through the first pressure regulating valve (4). The hydrogen sulfide cylinder (2) is connected to the gas storage tank (8) through the second pressure regulating valve (5). The methane cylinder (3) is connected to the gas storage tank (8) through the third pressure regulating valve (6). The gas storage tank (8) has a built-in pressure gauge. The solid-liquid mixing tank (22) is provided with a water inlet (23) and a sand inlet (24). Both the water inlet (23) and the sand inlet (24) are provided with needle valves.

7. The multiphase flow erosion corrosion testing apparatus according to claim 1, characterized in that, A first pressure gauge (11) and a first flow meter (12) are provided on the pipeline between the adjustable flow valve (10) and the first heater (13). A second flow meter (19) and a second pressure gauge (20) are provided on the pipeline between the second heater (18) and the mud pump (21). A third pressure gauge (27) is provided on the pipeline between the booster pump (26) and the third heater (28). A third flow meter (29) is provided on the pipeline between the third heater (28) and the fourth ball valve (30) and the fifth ball valve (31). The first heater (13), the second heater (18) and the third heater (28) are all equipped with thermometers.

8. The multiphase flow erosion corrosion testing apparatus according to claim 1, characterized in that, Multiple pressure regulating valves are connected to the gas storage tank (8) through a first check valve (7). A second check valve (15) is provided on the pipeline between the third ball valve (25) and the first ball valve (14). A third check valve (16) is provided on the pipeline between the third ball valve (25) and the second ball valve (17).

9. A method for testing multiphase flow erosion corrosion, characterized in that, Based on the multiphase flow erosion corrosion testing apparatus according to any one of claims 1 to 8, the multiphase flow erosion corrosion testing method includes: During pure vapor phase erosion corrosion test: Close the second ball valve, and open the first, third, fourth, and fifth ball valves; Open multiple pressure regulating valves to fill the gas storage tank with mixed gas; The pressure of the mixed gas is adjusted by a pressure reducing valve, and the flow rate of the mixed gas is adjusted by an adjustable flow valve. Turn on the first heater to preheat the gas mixture; Turn on the booster pump to pressurize the gas mixture; Turn on the third heater to heat the gas mixture; The mixed gas enters the erosion chamber and the test pipeline to conduct the erosion corrosion test; During the liquid-solid two-phase erosion corrosion test: Close the first ball valve, and open the second, third, fourth, and fifth ball valves; Liquid and erosion solid particles are added to the solid-liquid mixing tank to form a sand-carrying liquid; Turn on the mud pump to suck out the sand-carrying liquid from the solid-liquid mixing tank; Turn on the second heater to preheat the sand-carrying fluid; Turn on the booster pump to pressurize the sand-carrying fluid; Turn on the third heater to heat the sand-carrying liquid; The sand-carrying liquid is introduced into the erosion chamber and test pipeline to conduct erosion corrosion tests; During the gas-liquid two-phase erosion corrosion test: Open the first ball valve, the second ball valve, the third ball valve, the fourth ball valve, and the fifth ball valve; Add liquid to the solid-liquid mixing tank; Turn on the mud pump to suck out the liquid from the solid-liquid mixing tank; Turn on the second heater to preheat the liquid; Open multiple pressure regulating valves to fill the gas storage tank with mixed gas; The pressure of the mixed gas is adjusted by a pressure reducing valve, and the flow rate of the mixed gas is adjusted by an adjustable flow valve. Turn on the first heater to preheat the gas mixture; Turn on the booster pump to pressurize the gas-liquid two-phase erosion medium; Turn on the third heater to heat the gas-liquid two-phase erosion medium; A gas-liquid two-phase erosion medium is introduced into the erosion chamber and test pipeline to conduct an erosion corrosion test; During the gas-solid-liquid three-phase erosion corrosion test: Open the first ball valve, the second ball valve, the third ball valve, the fourth ball valve, and the fifth ball valve; Liquid and erosion solid particles are added to the solid-liquid mixing tank to form a sand-carrying liquid; Turn on the mud pump to suck out the sand-carrying liquid from the solid-liquid mixing tank; Turn on the second heater to preheat the sand-carrying fluid; Open multiple pressure regulating valves to fill the gas storage tank with mixed gas; The pressure of the mixed gas is adjusted by a pressure reducing valve, and the flow rate of the mixed gas is adjusted by an adjustable flow valve. Turn on the first heater to preheat the gas mixture; Turn on the booster pump to pressurize the gas-liquid-solid three-phase erosion medium; Turn on the third heater to heat the gas-liquid-solid three-phase erosion medium; A gas-liquid-solid three-phase erosion medium is introduced into the erosion chamber and test pipeline for erosion corrosion testing.

10. The multiphase flow erosion corrosion test method according to claim 9, characterized in that, During the pure gas phase erosion corrosion test: open the cyclone separator and circulate the mixed gas into the gas storage tank; During the liquid-solid two-phase erosion corrosion test: turn on the cyclone separator and circulate the sand-carrying liquid into the solid-liquid mixing tank; During the gas-liquid two-phase erosion corrosion test: open the cyclone separator and circulate the mixed gas in the gas-liquid two-phase erosion medium into the gas storage tank, and circulate the liquid in the gas-liquid two-phase erosion medium into the solid-liquid mixing tank. During the three-phase erosion corrosion test of gas, solid, and liquid: open the cyclone separator and circulate the mixed gas in the three-phase erosion medium into the gas storage tank, and circulate the sand-carrying liquid in the two-phase erosion medium into the solid-liquid mixing tank.

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