Erosion corrosion testing apparatus and method

Abstract

The application discloses a kind of scouring corrosion testing device and method, belong to oil and gas field development technical field.The device includes: mixed separation system, pre-dispensing system, loop system and testing system;Mixed separation system includes gas cylinder and mixed separation tank, gas cylinder and mixed separation tank are connected by pipeline;Pre-dispensing system includes dispensing tank, dispensing tank and mixed separation tank are connected by pipeline;Testing system includes first probe, second probe and third probe, first probe is carbon steel type resistance probe, second probe is stainless steel coupon with the same hardness as carbon steel type, third probe is carbon steel type linear polarization probe;The inlet and outlet of loop system are connected to mixed separation tank, first probe, second probe and third probe are arranged in the pipeline of loop system.Using the device, the proportion of erosion or electrochemical corrosion in the scouring corrosion process is quantitatively characterized.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology, and in particular to a device and method for testing erosion corrosion. Background Technology

[0002] With the continuous increase in oil and gas transportation volume, erosion corrosion has become one of the important factors threatening the safe production of oil pipelines. Erosion corrosion refers to the metal damage phenomenon caused by high-speed relative motion between the metal surface and corrosive fluids, and is the result of the simultaneous action of particle erosion and electrochemical corrosion on the pipeline. In actual operating conditions, gas, liquid, and solid mixtures are usually transported. During the transportation process, particle erosion and electrochemical corrosion may couple, and the damage caused by this coupling effect is far greater than that caused by particle erosion or electrochemical corrosion alone. Therefore, clearly defining the impact of electrochemical corrosion and particle erosion in the erosion corrosion process can lead to targeted improvements in subsequent oil and gas field development.

[0003] When studying erosion corrosion, one approach is to evaluate the erosion effect caused by the purely mechanical action of solid or deformable particles on the metal pipe wall; another approach is to evaluate the electrochemical corrosion effect of metal pipes in corrosive environments.

[0004] In the process of realizing this invention, the inventors discovered that the related technology has at least the following problems:

[0005] The aforementioned technologies only evaluate one aspect of particle erosion and electrochemical corrosion. Therefore, they cannot evaluate the scouring corrosion problem under the coupling effect of erosion and electrochemical corrosion, and thus cannot quantitatively characterize the role of particle erosion or electrochemical corrosion in the scouring corrosion process. Consequently, they cannot provide targeted improvements for oil and gas field development. Summary of the Invention

[0006] In view of this, this application provides a scouring corrosion testing device and method, which can quantitatively characterize the proportion of scouring or electrochemical corrosion in the scouring corrosion process.

[0007] On the one hand, this application provides a scouring corrosion testing device, which includes a mixing and separation system, a pre-mixed liquid system, a loop system, and a testing system;

[0008] The mixing and separation system includes a gas cylinder and a mixing and separation tank, which are connected by a pipeline. The gas cylinder is used to input gas into the mixing and separation tank.

[0009] The pre-mixing system includes a mixing tank, which is connected to the mixing and separating tank via a pipeline. The mixing tank is used to input liquid into the mixing and separating tank.

[0010] The testing system includes a first probe, a second probe, and a third probe. The first probe is a carbon steel resistance probe, the second probe is a stainless steel plate with the same hardness as carbon steel, and the third probe is a carbon steel linear polarization probe.

[0011] The inlet and outlet of the loop system are both connected to the mixing and separating tank, and the first probe, the second probe, and the third probe are installed in the pipeline of the loop system.

[0012] Optionally, the mixing and separation system further includes a vacuum line, an inlet line, and a tank inlet line;

[0013] The first end of the inlet pipe is located outside the mixing and separating tank, and the second end extends into the bottom of the mixing and separating tank. The first end of the inlet pipe, the first end of the vacuum pipe, and the first end of the air inlet pipe are connected by a tee.

[0014] A vacuum pump and a needle valve are installed on the vacuum line, with the needle valve located between the vacuum pump and the first end of the vacuum line.

[0015] The gas cylinder and gas control valve are installed on the air inlet pipeline, and the gas control valve is located between the gas cylinder and the first end of the air inlet pipeline.

[0016] Optionally, a pressure gauge is installed on the upper part of the mixing and separating tank;

[0017] The pressure gauge's connecting pipe is connected to the interior of the mixing and separating tank.

[0018] Optionally, a heating device is installed on the mixing and separating tank.

[0019] Optionally, a temperature gauge is installed on the upper part of the mixing and separating tank;

[0020] The thermometer's connecting pipe is connected to the interior of the mixing and separating tank.

[0021] Optionally, the pre-mixed liquid system further includes a pre-mixed liquid inlet pipeline, the first end of which is connected to the lower part of the side wall of the mixing tank, and the second end of which is connected to the bottom surface of the mixing and separating tank.

[0022] A first ball valve and an inlet pump are installed on the pre-mixed liquid inlet pipeline, and the inlet pump is located between the first ball valve and the first end of the pre-mixed liquid inlet pipeline.

[0023] The top of the mixing and separating tank is equipped with an outlet pipeline, and a one-way control valve is installed on the outlet pipeline.

[0024] Optionally, the loop system includes a water inlet pipeline, an oil inlet pipeline, and a mixed liquid outlet pipeline;

[0025] The first end of the water inlet pipeline is connected to the lower part of the side wall of the mixing and separating tank;

[0026] The first end of the oil inlet pipeline is connected to the middle part of the side wall of the mixing and separating tank;

[0027] The first end of the mixed liquid outlet pipeline, the second end of the water inlet pipeline, and the second end of the oil inlet pipeline are connected by a tee.

[0028] A first flow valve and a water feeder are installed on the water inlet pipeline, and the water feeder is located between the first flow valve and the second end of the water inlet pipeline.

[0029] A second flow valve and an oil feed pump are installed on the oil inlet pipeline, with the oil feed pump located between the second flow valve and the second end of the oil inlet pipeline.

[0030] Optionally, the loop system further includes a sand inlet pipeline, a mixing pump, and a mixing pump inlet pipeline;

[0031] The mixing pump is installed at the first end of the mixing pump inlet pipeline;

[0032] A sand feeding pump and a second ball valve are installed sequentially on the sand inlet pipeline.

[0033] The second end of the mixed liquid outlet pipeline, the first end of the sand inlet pipeline, and the second end of the mixing pump inlet pipeline are connected by a tee.

[0034] Optionally, the loop system further includes a loop outlet line;

[0035] The first end of the loop outlet pipeline is connected to the upper part of the side wall of the mixing and separating tank, and the second end is connected to the third probe;

[0036] The testing system also includes a computer;

[0037] The first probe and the third probe are respectively connected to the computer.

[0038] On the other hand, embodiments of this application provide a method for testing erosion corrosion, the method utilizing the apparatus described in any of the preceding claims, the method comprising:

[0039] The gas in the gas cylinder and the liquid in the liquid preparation tank are introduced into the mixing and separation tank, and then the substances in the mixing and separation tank are introduced into the loop system. At the same time, sand is added to the loop system to form a mixed medium flowing through the first probe, the second probe and the third probe.

[0040] The erosion rate V1 is measured using the first probe, the erosion rate V2 is measured using the second probe, and the electrochemical corrosion rate V3 is measured using the third probe.

[0041] When V1 = V2 + V3, it is determined that erosion and electrochemical corrosion do not have a coupling effect.

[0042] When V1 > V2 + V3, it is determined that erosion and electrochemical corrosion have a coupling effect.

[0043] The beneficial effects of the technical solutions provided in this application are:

[0044] Because the scouring corrosion rate, erosion rate, and electrochemical corrosion rate are measured using the first, second, and third probes respectively, the scouring corrosion testing device can quantitatively characterize the proportion of erosion or electrochemical corrosion in the scouring corrosion process. In other words, it can simultaneously and quantitatively measure the erosion, electrochemical corrosion, and scouring corrosion suffered by the pipeline in a multi-phase corrosive medium environment of gas, liquid, and solid, thus more realistically simulating the actual working conditions of oil and gas pipelines. At the same time, the measured data can be used to make targeted improvements to subsequent oil and gas field development work, which has important guiding significance for oil and gas field development. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the erosion corrosion testing device provided in the embodiments of this application.

[0047] The labels in the attached diagram are as follows:

[0048] 1-Gas cylinder;

[0049] 2-Mixing and separating tank;

[0050] 3-Liquid preparation tank;

[0051] 4-First probe;

[0052] 5-Second probe;

[0053] 6-Third probe;

[0054] 7-Vacuum pump;

[0055] 8-Needle valve;

[0056] 9-Gas control valve;

[0057] 10 - One-way control valve;

[0058] 11-Pressure gauge;

[0059] 12-Thermometer;

[0060] 13-First ball valve;

[0061] 14 - Inlet pump;

[0062] 15 - First flow valve;

[0063] 16-Water feed pump;

[0064] 17-Second ball valve;

[0065] 18-Mixing pump;

[0066] 19-Sand feed pump;

[0067] 20-Loop outlet valve;

[0068] 21-Second flow valve;

[0069] 22-Oil feed pump;

[0070] 23-Computer;

[0071] 24-Vacuum line;

[0072] 25 - Intake line;

[0073] 26 - Tank inlet pipeline;

[0074] 27-Pre-mixed solution inlet pipeline;

[0075] 28 - Outlet pipeline;

[0076] 29 - Water inlet pipeline;

[0077] 30 - Oil inlet pipeline;

[0078] 31-Sand inlet pipeline;

[0079] 32 - Mixed liquid outlet pipeline;

[0080] 33 - Loop outlet pipeline;

[0081] 34 - Mixing pump inlet pipeline;

[0082] 35 - Mixing pump outlet pipeline.

[0083] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0084] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0085] Before providing a further detailed description of the embodiments of this application, the directional terms used in the embodiments of this application, based on the directions shown in the figures, are merely used to clearly describe the erosion corrosion testing device and method of the embodiments of this application, and do not have the meaning of limiting the scope of protection of this application.

[0086] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0087] This application provides a scouring corrosion testing device, see [link to relevant documentation] Figure 1 The device includes a mixing and separation system, a pre-mixing system, a loop system, and a testing system.

[0088] The mixing and separation system includes a gas cylinder 1 and a mixing and separation tank 2, which are connected by a pipeline. The gas cylinder 1 is used to input gas into the mixing and separation tank 2.

[0089] The pre-mixing system includes a mixing tank 3, which is connected to a mixing and separation tank 2 via pipelines. The mixing tank 3 is used to input liquid into the mixing and separation tank 2.

[0090] The testing system includes a first probe 4, a second probe 5, and a third probe 6.

[0091] It should be noted that the first probe 4 is a carbon steel resistance probe, the second probe 5 is a stainless steel plate with the same hardness as carbon steel, and the third probe 6 is a carbon steel linear polarization probe.

[0092] It should be noted that different corrosion monitoring methods have varying sensitivities to pipeline damage. The first probe, 4, is a carbon steel resistance probe made of the same material as the pipeline in the field. Its basic principle is to measure the change in resistance caused by the reduction of the cross-sectional area of ​​a metal element due to external factors. The resistance probe is not limited by the external fluid medium and can simultaneously measure the erosion corrosion rate caused by erosion and electrochemical corrosion, but it cannot distinguish between the two.

[0093] The second probe 5 is a stainless steel plate with the same hardness as carbon steel. Due to its high chromium content, stainless steel has excellent resistance to electrochemical corrosion and will not undergo electrochemical corrosion in the loop environment. There is a corresponding relationship between the hardness of the material and its erosion resistance. When the hardness of stainless steel and the pipe material are the same, their erosion resistance is basically the same. Therefore, this type of stainless steel plate can be used to measure the erosion rate separately.

[0094] The third probe, 6, is a linear polarization probe for carbon steel. This method is based on the linear relationship between polarization potential and polarization current in the weakly polarized region near the metal's self-corrosion potential (ΔE is 0-10mV or 0-30mV) within the electrochemical reaction system. The corrosion rate of the metal can be calculated by utilizing the inverse relationship between the slope Rp (polarization resistance) and the corrosion current (proportionality constant B). Therefore, this type of linear polarization probe can only measure the electrochemical corrosion rate caused by electrochemical action.

[0095] The inlet and outlet of the loop system are both connected to the mixing and separating tank 2, and the first probe 4, the second probe 5 and the third probe 6 are installed in the pipeline of the loop system.

[0096] In summary, since the scouring corrosion rate, erosion rate, and electrochemical corrosion rate were measured using the first probe 4, the second probe 5, and the third probe 6, respectively, the scouring corrosion testing device can quantitatively characterize the proportion of erosion or electrochemical corrosion in the scouring corrosion process. This means it can simultaneously and quantitatively measure the erosion, electrochemical corrosion, and scouring corrosion suffered by the pipeline in a multi-phase corrosive medium environment (gas, liquid, and solid), more realistically simulating the actual working conditions of oil and gas pipelines. Furthermore, the measured data can be used to make targeted improvements to subsequent oil and gas field development work, providing important guidance for oil and gas field development.

[0097] The following provides a more detailed description of the various components and functions of the erosion corrosion testing device provided in this embodiment.

[0098] Optionally, nitrogen or a test gas, such as carbon dioxide, can be filled into the gas cylinder 1.

[0099] Optionally, the mixing and separation system also includes a vacuum line 24, an air inlet line 25, and a tank inlet line 26. The first end of the tank inlet line 26 is located outside the mixing and separation tank 2, and the second end extends into the bottom of the mixing and separation tank 2. The first end of the tank inlet line 26, the first end of the vacuum line 24, and the first end of the air inlet line 25 are connected by a tee.

[0100] A vacuum pump 7 and a needle valve 8 are installed on the vacuum line 24. The needle valve 8 is located between the vacuum pump 7 and the first end of the vacuum line 24.

[0101] A gas cylinder 1 and a gas control valve 9 are installed on the air inlet line 25. The gas control valve 9 is located between the gas cylinder 1 and the first end of the air inlet line 25.

[0102] Optionally, a pressure gauge 11 is installed on the upper part of the mixing and separating tank 2; the connecting pipe of the pressure gauge 11 is connected to the interior of the mixing and separating tank 2.

[0103] It should be noted that during the process of filling the mixing and separating tank 2 with gas from cylinder 1, if the pressure inside the mixing and separating tank 2 reaches the preset test pressure, the filling of test gas will be stopped.

[0104] Optionally, a heating device is installed on the mixing and separating tank 2.

[0105] Optionally, the heating device can be a heating belt, which is wrapped around the outer wall of the mixing and separating tank 2. Since the heating belt is equipped with a resistance wire and the resistance wire is connected to an external power source, when the power is turned on, electrical energy is converted into heat energy, so that the heating belt can heat the inside of the mixing and separating tank 2. Alternatively, the heating device can be a thermocouple, which is inserted into the inside of the mixing and separating tank 2 for heating.

[0106] Optionally, a temperature gauge 12 is installed on the upper part of the mixing and separating tank 2; the connecting pipe of the temperature gauge 12 is connected to the interior of the mixing and separating tank 2.

[0107] It should be noted that when the temperature inside the mixing and separating tank 2 reaches the preset test temperature, the heating device will stop heating.

[0108] Optionally, the pre-mixed liquid system also includes a pre-mixed liquid inlet pipeline 27, the first end of which is connected to the lower part of the side wall of the mixing tank 3, and the second end of which is connected to the bottom surface of the mixing and separation tank 2; a first ball valve 13 and an inlet pump 14 are installed on the pre-mixed liquid inlet pipeline 27, and the inlet pump 14 is located between the first ball valve 13 and the first end of the pre-mixed liquid inlet pipeline 27.

[0109] Optionally, the top of the mixing and separating tank 2 is provided with an outlet pipeline 28, and a one-way control valve 10 is installed on the outlet pipeline 28.

[0110] It should be noted that the one-way control valve 10 controls the flow of medium only from the inside of the mixing and separating tank 2 to the outside, and not from the outside to the inside. This flow direction prevents external gases from entering the tank and causing pollution to the gas environment inside the tank.

[0111] Optionally, the loop system includes a water inlet pipeline 29, an oil inlet pipeline 30, and a mixed liquid outlet pipeline 32; the first end of the water inlet pipeline 29 is connected to the lower part of the side wall of the mixing and separating tank 2; the first end of the oil inlet pipeline 30 is connected to the middle part of the side wall of the mixing and separating tank 2.

[0112] It is understandable that, since the density of oil is less than that of water, the middle part of the mixing and separating tank 2 is an oil layer and the lower part is a water layer.

[0113] Optionally, the first end of the mixed liquid outlet pipeline 32, the second end of the water inlet pipeline 29, and the second end of the oil inlet pipeline 30 are connected by a tee. A first flow valve 15 and a water feed pump 16 are installed on the water inlet pipeline 29, with the water feed pump 16 located between the first flow valve 15 and the second end of the water inlet pipeline 29; a second flow valve 21 and an oil feed pump 22 are installed on the oil inlet pipeline 30, with the oil feed pump 22 located between the second flow valve 21 and the second end of the oil inlet pipeline 30.

[0114] It should be noted that both the water pump 16 and the oil pump 22 can pressurize the inlet of their respective pump bodies, increasing the flow velocity in the inlet pipe of the pump body, so as to ensure that there is a sufficient supply of water and oil in the pipeline of the scouring corrosion test device.

[0115] It should be noted that the first flow valve 15 and the second flow valve 21 can not only control the flow of fluid in their respective pipelines, but also measure the flow rate of the fluid in the pipelines.

[0116] Optionally, the loop system also includes a sand inlet pipeline 31, a mixing pump 18, and a mixing pump inlet pipeline 34; the mixing pump 18 is installed at the first end of the mixing pump inlet pipeline 34; a sand feed pump 19 and a second ball valve 17 are installed sequentially on the sand inlet pipeline; the second end of the mixed liquid outlet pipeline 32, the first end of the sand inlet pipeline 31, and the second end of the mixing pump inlet pipeline 34 are connected by a tee.

[0117] Optionally, the sand can be added manually. It should be noted that this test simulates the on-site working conditions to determine the amount of sand to be added before adding sand to the test device.

[0118] Optionally, the loop system also includes a loop outlet line 33; the first end of the loop outlet line 33 is connected to the upper part of the side wall of the mixing and separating tank 2, and the second end is connected to the third probe 6.

[0119] Optionally, the testing system also includes a computer 23; the first probe 4 and the third probe 6 are respectively connected to the computer 23.

[0120] Optionally, a loop discharge valve 20 is installed on the mixing pump outlet line 35.

[0121] Optionally, all pipelines in the scouring corrosion testing device are wrapped with insulation, as are the outer walls of the liquid preparation tank 3 and the mixing and separation tank 2.

[0122] It should be noted that if the heating device installed on the mixing and separating tank 2 is a heating belt wrapped around the outer wall of the tank, then the insulation layer is located on the outside of the heating belt and wraps around the heating belt.

[0123] Understandably, by installing insulation layers on the outer walls of pipelines and tanks, the temperature of the fluid in the device is maintained at a preset test temperature during the test, which is determined based on actual operating conditions. The design of the insulation layer enables the device to more realistically simulate the actual operating conditions of oil and gas pipelines.

[0124] The working process of the erosion corrosion testing device provided in this embodiment is as follows:

[0125] First, purify the gas in the device. The specific steps are as follows:

[0126] The first step is to open all valves in the device except for the one-way control valve 10 and the first ball valve 13.

[0127] The second step is to fill the gas cylinder 1 with nitrogen, and then fill the erosion corrosion test device with sufficient nitrogen. After that, turn on the vacuum pump 7 and wait for the gas in the erosion corrosion test device to be extracted before filling the erosion corrosion test device with nitrogen.

[0128] It should be noted that, in order to ensure that there are no other polluting gases in the erosion corrosion testing device, the nitrogen filling-vacuuming-nitrogen filling operation can be performed multiple times as needed, and the specific number of operations is not limited here.

[0129] Next, a fluid medium is introduced into the erosion corrosion testing device. The specific operation is as follows:

[0130] Step 1: Close all valves in the device except for the one-way control valve 10 and the first ball valve 13, and open the one-way control valve 10 and the first ball valve 13.

[0131] It is understandable that opening the one-way control valve 10 allows the nitrogen gas in the mixing and separation tank 2 to be discharged from the tank, thereby allowing the liquid in the liquid preparation tank 3 to flow into the mixing and separation tank 2.

[0132] Step 2: Determine the required oil and water volumes for the test process based on actual operating conditions. Open the first ball valve 13 and the inlet pump 14. First, introduce the preset amount of oil from the mixing tank 3 into the mixing and separating tank 2. Then, replace the liquid in the mixing tank 2 with the preset amount of water. After introducing the water into the mixing and separating tank 2, close the one-way control valve 10 and the first ball valve 13.

[0133] Step 3: Determine the required gas volume for the test based on the operating conditions, and fill gas cylinder 1 with the required test gas, such as carbon dioxide. Open gas control valve 9 to introduce the test gas into mixing and separating tank 2. When the pressure on pressure gauge 11 reaches the preset value, close gas control valve 9. Simultaneously, heat mixing and separating tank 2 using a heating device. When the temperature on temperature gauge 12 reaches the preset temperature value, turn off the heating device.

[0134] Understandably, introducing carbon dioxide into the mixing and separating tank 2 better simulates the environment encountered during actual oil and gas field development.

[0135] Furthermore, a mixed medium is formed in the loop system. The specific operation is as follows:

[0136] Step 1: Open the first flow valve 15, water pump 16, second ball valve 17, mixing pump 18, sand pump 19, loop outlet valve 20, second flow valve 21, and oil pump 22 in the loop system. The oil in the middle and the water in the lower layer of the mixing and separating tank 2 flow into the loop system through the oil inlet pipe 30 and the water inlet pipe 29, respectively.

[0137] Step 2: When the oil-water mixture flows through the mixture outlet pipeline 32, sand is introduced into the sand inlet pipeline 31 according to the preset sand amount. The mixture and sand form a mixed medium, which flows through the mixing pump 18.

[0138] Finally, the corrosion rates were measured. The specific procedure is as follows:

[0139] The mixed medium flows sequentially through the first probe 4, the second probe 5, and the third probe 6. The erosion rate V1 can be measured using the first probe 4, the erosion rate V2 using the second probe 5, and the electrochemical corrosion rate V3 using the third probe 6. The computer 23 collects the data.

[0140] It should be noted that after the mixed medium flows through the first probe 4, the second probe 5, and the third probe 6, it flows back to the mixing and separating tank 2 along the loop outlet pipeline 33. The mixed medium circulates throughout the entire device.

[0141] In summary, the erosion corrosion testing device, by using the first probe 4, the second probe 5, and the third probe 6 to measure the erosion corrosion rate, the scouring corrosion rate, and the electrochemical corrosion rate, can quantitatively characterize the proportion of scouring or electrochemical corrosion in the erosion corrosion process. This means it can simultaneously and quantitatively measure the scouring, electrochemical corrosion, and erosion corrosion suffered by the pipeline in a multi-phase corrosive medium environment (gas, liquid, and solid), more realistically simulating the actual working conditions of oil and gas pipelines. Furthermore, the measured data can be used to make targeted improvements to subsequent oil and gas field development work, providing important guidance for oil and gas field development.

[0142] Meanwhile, not only were temperature gauges 12 and pressure gauges 11 installed on the mixing and separating tank 2 to ensure that the test conditions meet actual operating conditions, but an insulation layer was also installed on the outer wall of the entire erosion corrosion testing device to prevent heat loss. These two methods enable the erosion corrosion testing device to more realistically simulate the working scenario of oil and gas pipelines, allowing for better adjustments to oil and gas field development plans.

[0143] In addition, since the amount of oil, water and sand added during the erosion corrosion testing process is measured based on the ratio and flow rate of oil, sand and water produced under actual working conditions, the test conditions more realistically simulate the working scenario of oil and gas pipelines, and the data obtained from the test are more instructive.

[0144] This application also provides a method for testing erosion corrosion, which utilizes the apparatus described in any of the above claims, and includes:

[0145] The gas in cylinder 1 and the liquid in liquid mixing tank 3 are fed into mixing and separating tank 2. The substances in mixing and separating tank 2 are then fed into the loop system. At the same time, sand is added to the loop system to form a mixed medium that flows through the first probe 4, the second probe 5 and the third probe 6.

[0146] The erosion rate V1 was measured using the first probe 4, the erosion rate V2 was measured using the second probe 5, and the electrochemical corrosion rate V3 was measured using the third probe 6.

[0147] When V1 = V2 + V3, it is determined that erosion and electrochemical corrosion are not coupled. Then, the higher of the erosion rate V2 and the electrochemical corrosion rate V3 is calculated. If the erosion rate V2 has a higher proportion, adjustments should be made to the production process during oil and gas field development, such as adjusting the flow rate or velocity of the medium entering the pipeline to reduce the damage caused by erosion at high flow rates. If the electrochemical corrosion rate V3 has a higher proportion, adjustments should be made to the anti-corrosion measures during oil and gas field development, such as adding corrosion inhibitors or applying an anti-corrosion layer to the pipeline wall to reduce corrosion damage.

[0148] When V1 > V2 + V3, it is determined that erosion and electrochemical corrosion have a coupled effect, and the production process and anti-corrosion measures in the oil and gas field development process need to be adjusted.

[0149] In summary, this erosion corrosion testing method can quantitatively characterize the proportion of erosion or electrochemical corrosion in the erosion corrosion process. In other words, it can simultaneously and quantitatively measure the erosion, electrochemical corrosion, and scouring corrosion suffered by pipelines in a multiphase corrosive medium environment of gas, liquid, and solid, thus more realistically simulating the actual working conditions of oil and gas pipelines. At the same time, the measured data can be used to make targeted improvements to subsequent oil and gas field development work, which has important guiding significance for oil and gas field development.

[0150] It should be understood that in this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0151] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the application disclosed herein. This application is intended to cover the general principles of this application and to include common knowledge or conventional techniques in the art not disclosed herein.

[0152] The above description is only for the purpose of enabling those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An apparatus for erosion corrosion testing, characterized by, The device comprises a mixing separation system, a pre-liquid preparation system, a loop system and a testing system; The mixing separation system comprises a gas cylinder (1) and a mixing separation tank (2), the gas cylinder (1) and the mixing separation tank (2) are connected through pipelines, and the gas cylinder (1) is used for inputting gas into the mixing separation tank (2); The pre-liquid preparation system comprises a liquid preparation tank (3), the liquid preparation tank (3) and the mixing separation tank (2) are connected through pipelines, and the liquid preparation tank (3) is used for inputting liquid into the mixing separation tank (2); The test system comprises a first probe (4), a second probe (5) and a third probe (6), the first probe (4) is a carbon steel type resistance probe, the second probe (5) is a stainless steel coupon with the same hardness as the carbon steel type, and the third probe (6) is a carbon steel type linear polarization probe; wherein the first probe (4) is used for measuring the erosion corrosion rate , the second probe (5) is used for measuring the erosion rate , and the third probe (6) is used for measuring the electrochemical corrosion rate . The inlet and outlet of the loop system are connected to the mixing separation tank (2), and the first probe (4), the second probe (5) and the third probe (6) are arranged in the pipeline of the loop system.

2. An erosion test device according to claim 1, wherein The mixing separation system further comprises a vacuum pipeline (24), an air inlet pipeline (25) and a tank inlet pipeline (26); The first end of the tank inlet pipeline (26) is located outside the mixing separation tank (2), and the second end extends into the bottom end inside the mixing separation tank (2), and the first end of the tank inlet pipeline (26), the first end of the vacuum pipeline (24) and the first end of the air inlet pipeline (25) are connected through a three-way joint; A vacuum pump (7) and a needle valve (8) are installed on the vacuum pipeline (24), and the needle valve (8) is located between the vacuum pump (7) and the first end of the vacuum pipeline (24); The gas cylinder (1) and a gas control valve (9) are installed on the air inlet pipeline (25), and the gas control valve (9) is located between the gas cylinder (1) and the first end of the air inlet pipeline (25).

3. The erosion test device of claim 1, wherein, A pressure gauge (11) is installed on the upper part of the mixing separation tank (2); The connecting pipe of the pressure gauge (11) is in communication with the inside of the mixing separation tank (2).

4. The erosion test device of claim 1, wherein, A heating device is installed on the mixing separation tank (2).

5. The erosion test device of claim 1, wherein, A temperature gauge (12) is installed on the upper part of the mixing separation tank (2); The connecting pipe of the temperature gauge (12) is in communication with the inside of the mixing separation tank (2).

6. The erosion test device of claim 1, wherein, The pre-liquid preparation system further comprises a pre-liquid preparation liquid inlet pipeline (27), the first end of the pre-liquid preparation liquid inlet pipeline (27) is connected with the lower part of the side wall of the liquid preparation tank (3), and the second end is connected with the bottom surface of the mixing separation tank (2); A first ball valve (13) and a liquid inlet pump (14) are installed on the pre-liquid preparation liquid inlet pipeline (27), and the liquid inlet pump (14) is located between the first ball valve (13) and the first end of the pre-liquid preparation liquid inlet pipeline (27); A one-way control valve (10) is installed on the tank outlet pipeline (28) of the mixing separation tank (2).

7. The erosion test device of claim 1, wherein, The loop system comprises a water inlet pipeline (29), an oil inlet pipeline (30) and a mixed liquid outlet pipeline (32); The first end of the water inlet pipeline (29) is connected with the lower part of the side wall of the mixing separation tank (2); The first end of the oil inlet pipeline (30) is connected with the middle part of the side wall of the mixing separation tank (2); The first end of the mixed liquid outlet pipeline (32), the second end of the water inlet pipeline (29) and the second end of the oil inlet pipeline (30) are connected through a three-way joint; The water inlet pipeline (29) is provided with a first flow valve (15) and a water feeding pump (16), and the water feeding pump (16) is located between the first flow valve (15) and the second end of the water inlet pipeline (29); The oil inlet pipeline (30) is provided with a second flow valve (21) and an oil feeding pump (22), and the oil feeding pump (22) is located between the second flow valve (21) and the second end of the oil inlet pipeline (30).

8. An erosion test device according to claim 7, wherein The loop system further comprises a sand inlet pipeline (31), a mixing pump (18) and a mixing pump inlet pipeline (34); The mixing pump (18) is installed at the first end of the mixing pump inlet pipeline (34); The sand inlet pipeline is sequentially provided with a sand feeding pump (19) and a second ball valve (17); The second end of the mixed liquid outlet pipeline (32), the first end of the sand inlet pipeline (31) and the second end of the mixing pump inlet pipeline (34) are connected through a tee joint.

9. The erosion test device of claim 1, wherein, The loop system further comprises a loop liquid outlet pipeline (33); The first end of the loop liquid outlet pipeline (33) is connected to the upper part of the side wall of the mixed separation tank (2), and the second end is connected to the third probe (6); The test system further comprises a computer (23); The first probe (4) and the third probe (6) are respectively connected to the computer (23).

10. A method of erosion corrosion testing characterized by, The method utilizes the device according to any one of claims 1-9, and the method comprises: The gas in the gas cylinder (1) and the liquid in the liquid preparation tank (3) are introduced into the mixed separation tank (2), and then the substances in the mixed separation tank (2) are introduced into the loop system, while sand is added into the loop system, so as to form a mixed medium flowing through the first probe (4), the second probe (5) and the third probe (6); The method utilizes the device according to any one of claims 1-9, and the method comprises: The gas in the gas cylinder (1) and the liquid in the liquid preparation tank (3) are introduced into the mixed separation tank (2), and then the substances in the mixed separation tank (2) are introduced into the loop system, while sand is added into the loop system, so as to form a mixed medium flowing through the first probe (4), the second probe (5) and the third probe (6); The first probe (4) is used to measure the erosion corrosion rate The second probe (5) is used to measure the erosion rate The third probe (6) is used to measure the electrochemical corrosion rate ; When then it is determined that erosion and electrochemical corrosion do not produce a coupling effect; When then it is determined that the erosion and the electrochemical corrosion have a coupling effect.

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