CN110702595A - Multifunctional automatic simulation test device for top corrosion of wet gas pipeline - Google Patents
Multifunctional automatic simulation test device for top corrosion of wet gas pipeline Download PDFInfo
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Abstract
The invention discloses a multifunctional automatic simulation test device for corrosion on the top of a wet gas pipeline, which consists of a test loop system and a control and display system, wherein the test loop system comprises: the gas cylinder, the sedimentation tank, the electric heater, fixed pipe, flexible compound pipe, test tube, electrode, temperature probe, pressure probe etc. test tube is rectangle side pipe, and the bottom surface reserves gas injection mouth and a plurality of reference electrode mounting hole, and the top surface reserves notes liquid mouth, gas vent, a plurality of sample mounting hole, a plurality of working electrode mounting hole and probe mounting hole, and the side reserves auxiliary electrode mounting hole, and the both ends of test tube are respectively connected with a flexible compound pipe through the flange. The invention has the advantages that: the device can reflect the corrosion condition of the top of a wet gas pipeline paved at 0-90 degrees in the oil and gas development process, and can evaluate the effectiveness of the corrosion inhibitor under the working condition and the corrosion reducing effect of the corrosion inhibitor on the local damaged part of the coating.
Description
Technical Field
The invention relates to a test device, in particular to a multifunctional automatic simulation test device for top corrosion of a wet gas pipeline, and belongs to the technical field of oil and gas field development.
Background
With the extension of the exploitation period of the oil and gas well, the water content in the produced liquid is increased year by year, which increases the corrosion to the metal pipe.
In recent years, for further enhanced oil recovery, water injection or CO injection is usually adopted2Recovery of crude oil by means of alternate injection of water, CO reduction in coal chemical industry and in future hydrogen production industry2The CO can be increased while discharging2Swept area of flooding, enhanced oil recovery, but doing so further increases water content and CO in the produced fluids2The content of (a). Also, the fluids produced during oil and gas development often contain themselves corrosive media, such as CO, to varying degrees2、H2S, etc., CO dissolved in water2And H2S can cause serious corrosion in the pipeline.
The corrosion in the moisture gathering and transporting pipeline is mainly divided into bottom corrosion and top corrosion. At present, the understanding of the corrosion of the top is not sufficient, the conventional corrosion inhibitor is difficult to effectively protect the top, the corrosion problem of the top of the pipeline becomes more and more serious, particularly, the corrosion rate at the wedge-shaped pitting pit of the top of the pipeline is even as high as 5 mm/a. In addition, although some of the surfaces of the pipes are coated with a plating layer, they are locally damaged for some reasons, forming "large cathodes-small anodes", further exacerbating pitting corrosion. Pitting corrosion is difficult to monitor and predict, and the resulting risks and hazards are great. Once the petroleum pipe is perforated, the oil gas productivity can be reduced, the pipeline replacement period can be shortened, the maintenance cost can be increased, most importantly, potential safety hazards can be caused to field personnel in an oil and gas field, and leaked oil gas can cause pollution to gas, soil and water, so that environmental risks are caused.
Therefore, there is a need for a device capable of reflecting the corrosion conditions of the moisture pipeline under different condensation rates, pipeline gradients, moisture temperatures, pressures, flow rates and other conditions in the oil and gas pipeline transportation process, and evaluating the effectiveness of the corrosion inhibitor under the working condition and the corrosion inhibition effect of the corrosion inhibitor on the local damage of the coating layer.
Disclosure of Invention
The invention aims to provide a multifunctional automatic simulation test device for corrosion on the top of a wet gas pipeline, which can reflect the corrosion conditions of different condensation rates, pipeline gradients, wet gas temperatures, pressures, flow rates and the like in the oil and gas pipeline transportation process and evaluate the effectiveness of a corrosion inhibitor under the working condition.
In order to achieve the above object, the present invention adopts the following technical solutions:
the utility model provides a multi-functional automatic analogue test device of moisture pipeline top corruption which characterized in that comprises two major systems of test loop system, control and display system, wherein:
the aforementioned test loop system comprises: the device comprises a gas cylinder, a gas transmission hose, a deposition tank, an electric heater, a fixed pipe, a flexible composite pipe, a test pipe, an auxiliary electrode, a reference electrode, a working electrode, a temperature probe, a pressure probe, a flow meter, a flow pump and a constant temperature bath kettle, wherein a liquid outlet is reserved at the middle lower part of the side surface of the deposition tank, a liquid return port is reserved at the middle upper part of the side surface of the deposition tank, a liquid injection port and an exhaust port are reserved at the top surface of the deposition tank, a gas injection port and a liquid discharge port are reserved at the bottom surface of the deposition tank, the liquid outlet and the liquid return port are respectively welded with the fixed pipe, an easily assembled and disassembled heating insulation sleeve is wrapped outside the deposition tank, the electric heater is arranged in the deposition tank, the test pipe is arranged in the constant temperature bath kettle, the test pipe is a rectangular square pipe, two ends of which are respectively provided with a separate valve and a flange, a gas injection, the side surface is reserved with an auxiliary electrode mounting hole, the sample and the electrode are hermetically connected with the test tube, after the working electrode and the sample are mounted on the test tube, the bottom surfaces of the working electrode and the sample are flush with the inner surface of the top of the test tube, two ends of the test tube are respectively connected with a flexible composite tube through flanges, the other ends of the two flexible composite tubes are respectively connected with two fixed tubes welded at a liquid outlet and a liquid return port of a deposition tank through flanges, a gas cylinder is respectively connected with a gas injection port of the deposition tank and a gas injection port of the test tube through a gas hose, flowmeters are respectively mounted on the gas hose and the fixed tubes positioned at the liquid outlet end of the deposition tank, a flow pump is mounted on the fixed tubes positioned at the liquid outlet end of the deposition tank, a bypass is arranged beside the flow pump, and valves are mounted at two ends of the flow pump and two ends of;
the control and display system is used for controlling the test loop system and displaying relevant data of the test loop system.
The multifunctional automatic simulation test device for the corrosion of the top of the wet gas pipeline is characterized in that the deposition tank is made of polytetrafluoroethylene, corrosion-resistant alloy or PVC.
The multifunctional automatic simulation test device for corrosion at the top of the moisture-sinking pipeline is characterized in that the fixing pipe is made of polytetrafluoroethylene, corrosion-resistant alloy or PVC.
The automatic simulation test device for the corrosion of the top of the multifunctional wet gas pipeline is characterized in that the test tube is made of corrosion-resistant, pressure-resistant and temperature-resistant PC transparent plastic.
The multifunctional automatic simulation test device for the corrosion of the top of the wet gas pipeline is characterized in that the top surface of the test tube is provided with a thickening layer.
The utility model provides an automatic analogue test device of multi-functional moisture pipeline top corrosion, a serial communication port, the exit end of gas injection mouth on the aforementioned test pipe is close to the test pipe, annotate the entry end that the liquid mouth is close to the test pipe, the position of gas vent corresponds with the position of gas injection mouth, gas injection mouth department, annotate liquid mouth department and gas vent department and all install the valve, the sample mounting hole is located the place ahead of gas vent, the working electrode mounting hole is located the place ahead of sample mounting hole, wherein, the interval that is located the entry end of foremost working electrode mounting hole and test pipe is greater than or equal to 1.5 m.
The multifunctional automatic simulation test device for the top corrosion of the wet gas pipeline is characterized in that the working electrode and the sample are made of bare steel sheets for oil well pipes, bare steel sheets for gathering and transportation pipelines or inner coating plating layers of the bare steel sheets or the bare steel sheets with damaged parts.
The multifunctional automatic simulation test device for the corrosion of the top of the wet gas pipeline is characterized in that except for the test tube, heating insulation sleeves which are easy to assemble and disassemble are wrapped on other tube sections and the tank body.
The automatic simulation test device for the corrosion of the top of the multifunctional wet gas pipeline is characterized in that the control and display system is connected with an electric heater, a temperature probe, a pressure probe, a flow meter and a flow pump in a test loop system, and is used for receiving the temperature detected by the temperature probe, the pressure detected by the pressure probe and the flow rate detected by the flow meter, recording the test time and displaying relevant data, presetting the temperature and the flow rate to control the power of the electric heater, the heating insulation sleeve and the flow pump, and automatically stopping heating and pumping after the test time is up.
The invention has the advantages that:
(1) the erosion and flow induced corrosion tests of liquid phase or gas-liquid two-phase flow can be realized;
(2) the test tube adopts a rectangular square tube, so that the induced corrosion of the actual flow pattern and flow state in the pipeline on the surface of the inner wall of the pipeline can be effectively reduced;
(3) the two ends of the test pipe are connected by using the flexible composite pipe, and the test pipe can be placed at any angle within the range of 0-90 degrees, so that the corrosion mechanism of the horizontal gathering and transportation pipe and the pipeline laid at any angle can be researched, and the influence of the flow pattern and the flow state on the corrosion behavior and the law of the horizontal gathering and transportation pipe and the pipeline and the corrosion prevention efficiency can be analyzed;
(4) a plurality of sample mounting holes and a plurality of working electrode mounting holes are reserved on the top surface of the test tube, so that not only can independent monitoring of weight loss analysis and electrochemical monitoring be realized, but also joint monitoring of the weight loss analysis and the electrochemical monitoring can be realized, 3-5 weight loss samples or parallel electrochemical corrosion samples can be simultaneously or independently monitored, and a large error caused by individual samples is avoided;
(5) the test tube is placed in a constant temperature bath (low temperature ice salt bath, constant temperature water bath or oil bath), and the influence of the condensation rate ratio critical value caused by the condensation rate and the moisture temperature on the top corrosion behavior can be simulated by respectively adjusting the temperature of the constant temperature bath outside the test tube and the temperature of the fluid in the test tube;
(6) the test sample is connected with the test tube in a sealing way through the screw threads, and the test sample is easy to assemble and disassemble, so that the test sample can be conveniently and rapidly installed and the sealing performance of the whole system is improved;
(7) by controlling the flow velocity, temperature and pressure of the fluid in the test tube, the influence of environmental factors such as different flow velocities (0-5 m/s), temperatures (-25-200 ℃) and pressures (0-3 MPa) on the corrosion behavior can be researched;
(8) by controlling the size of the inclination angle of the test tube, the influence of the gradient, the flow rate and the flow state of the pipeline and the like on the corrosion behavior can be respectively researched;
(9) the test loop is acid-resistant and alkali-resistant, allows the pH value of the test medium to be adjusted between 3 and 10, is also corrosion-resistant, allows the media in the pipe and the tank to be oxygenated and deoxygenated, and then is filled with CO2Or/and trace amount of H2S, SO may also be introduced2Iso CO2If more than two gases are required to be introduced, the impurity gases in the driving gas are respectively metered by matching with the flow meter;
(10) by matching with other characterization technologies, not only can the corrosion behavior be obtained and the corrosion mechanism be explored, but also the corrosion inhibition efficiency of the corrosion inhibitor and the local damage to the coating layer can be simulated and evaluated.
Drawings
FIG. 1 is a schematic diagram of the composition of a test loop system;
FIG. 2 is a schematic view of the structure of the test tube.
The meaning of the reference symbols in the figures: the device comprises a gas cylinder 1, a gas transmission hose 2, a deposition tank 3, an electric heater 4, a fixed tube 5, a flexible composite tube 6, a test tube 7, an auxiliary electrode 8, a reference electrode 9, a working electrode 10, a temperature probe 11, a pressure probe 12, a flow meter 13, a flow pump 14, a sample 15 and a constant temperature bath kettle 16.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
Automatic simulation test device
The invention provides a multifunctional automatic simulation test device for corrosion on the top of a wet gas pipeline, which consists of two systems, wherein the two systems are respectively as follows: test loop system, control and display system.
1. Test loop system
Referring to fig. 1, the test loop system includes: the device comprises a gas cylinder 1, a gas transmission hose 2, a deposition tank 3, an electric heater 4, a fixed pipe 5, a flexible composite pipe 6, a test pipe 7, an auxiliary electrode 8, a reference electrode 9, a working electrode 10, a temperature probe 11, a pressure probe 12, a flow meter 13, a flow pump 14 and a constant temperature bath 16.
The deposition tank 3 is made of polytetrafluoroethylene, corrosion-resistant alloy or PVC and is used for containing a test medium (simulation solution) and depositing solid particles such as sand particles, corrosion products and the like in the test medium, so that the solid particles can be prevented from being brought into a circulating system due to large flow velocity of the test medium, and further the damage of the solid particles to the flow pump 14 can be avoided. A liquid return port is reserved at the middle upper part of the side surface of the deposition tank 3, a liquid outlet is reserved at the middle lower part of the side surface, the liquid outlet and the liquid return port are respectively welded with a fixed pipe 5, the fixed pipe 5 is made of polytetrafluoroethylene, corrosion-resistant alloy or PVC, and a flange is arranged at the tail end of the fixed pipe; the top surface of the deposition tank 3 is reserved with a liquid injection port and an exhaust port, the bottom surface is reserved with a gas injection port and a liquid discharge port, and the liquid injection port, the exhaust port, the gas injection port and the liquid discharge port are all provided with valves. If the corrosion inhibitor is required to be added into the test medium (simulation solution), the corrosion inhibitor and the test medium can be mixed and added into the deposition tank 3 before the test, or the corrosion inhibitor can be injected into the deposition tank 3 through a liquid injection port under pressure in the test process. The outside of the deposition tank 3 is wrapped with an easily detachable heating jacket (not shown).
An electric heater 4, preferably an electric resistance heater, is placed in the deposition tank 3 for heating the test medium (simulated solution).
Referring to fig. 2, the test tube 7 is a rectangular square tube made of corrosion-resistant, temperature-resistant and pressure-resistant PC transparent plastic, and has separate valves and flanges at both ends, and a thickened top surface (i.e., a thickened layer is provided on the top surface to facilitate mounting of a sample or a working electrode). The bottom surface of test tube 7 is reserved with an air injection port and a plurality of reference electrode mounting holes, reference electrode 9(Ag/AgCl) is installed at the reference electrode mounting holes, the top surface is reserved with an injection port (used for prefabricating test samples and adding simulation solution), an air exhaust port, a plurality of sample mounting holes, a plurality of working electrode mounting holes and a plurality of probe mounting holes which correspond to the positions of the reference electrode mounting holes one by one, wherein the air injection port is close to the outlet end of the test tube 7, the injection port is close to the inlet end of the test tube 7, the position of the air exhaust port corresponds to the position of the air injection port, the valve is installed at the injection port and the air exhaust port, the sample mounting holes are located in front of the air exhaust port, and the working electrode mounting holes are located. The distance between the working electrode mounting hole positioned at the forefront and the inlet end of the test tube 7 is preferably more than or equal to 1.5m, so that the influence of the reducing convection type and the flow state can be avoided, a test parallel sample 15 (a weightless sample) is mounted at the sample mounting hole, a working electrode 10 (an electrochemical sample) is mounted at the working electrode mounting hole, the material of the sample 15 and the working electrode 10 can be bare steel sheets for oil well tubes, can also be bare steel sheets for gathering and transportation pipelines, can also be partially damaged inner coating and plating layer sheets of the sample 15 and the gathering and transportation pipelines, and after the working electrode 10 and the sample 15 are mounted on the test tube 7, the bottom surfaces of the two are flush with the inner surface of the top of the. The test tube 7 is placed in a constant temperature bath 16, and the constant temperature bath 16 can be provided with a temperature probe. An auxiliary electrode mounting hole is reserved on the side face of the test tube 7, an auxiliary electrode 8 (a Pt sheet or a carbon rod) is mounted at the auxiliary electrode mounting hole, and the auxiliary electrode 8 is close to the reference electrode 9 and the working electrode 10. And the sample 15 (a weightless sample) and the electrodes (the auxiliary electrode 8, the reference electrode 9 and the working electrode 10) are hermetically connected with the test tube 7 through screw threads, after the mounting is finished, the lower surfaces of the working electrode 10 and the sample 15 (the weightless sample) are flush with the inner surface of the top of the test tube 7, and connecting lines of the three electrodes are respectively communicated with corresponding interfaces of the electrochemical workstation. The test tube 7 with the sample 15, the electrode and the probe mounted thereon can be communicated with the whole loop through flanges at both ends, and can be used alone for film (scale) formation under static conditions, and when the test tube 7 is used alone, after the sample 15 or the working electrode 10 is mounted on the test tube 7, the other plug surfaces thereof are flush with the inner surface of the top surface of the test tube 7. When the test tube 7 is communicated with the whole loop, two ends of the test tube 7 are respectively connected with a flexible composite tube 6 through flanges, and the other ends of the two flexible composite tubes 6 are respectively connected with two fixed tubes 5 welded at a liquid outlet and a liquid return port of the deposition tank 3 through flanges. The flexible composite pipes 6 are used at the two ends of the test pipe 7, so that the test pipe 7 can be conveniently communicated with a loop under the condition that the inclination angle is greater than 0 degree, and if only a simulation test under the horizontal condition is carried out, the flexible composite pipes 6 are not needed. According to different experimental requirements, the test tube 7 can be placed in a low-temperature ice salt bath, a constant-temperature water bath or an oil bath.
The gas bottle 1 is respectively connected with a gas injection port of the deposition tank 3 and a gas injection port of the test tube 7 through a gas hose 2.
The flow pump 14 is arranged on the fixed pipe 5 positioned at the liquid outlet end of the sedimentation tank 3, the flow pump 14 can control the medium flow speed on the surface of the sample 15 according to the cross-sectional area ratio of the test pipe 7 and the fixed pipe 5 and the degree of the flowmeter 13, and the flow pump 14 can be driven to slightly move during deoxygenation or ventilation, so that the deoxygenation in each pipe in a loop and the sedimentation tank 3 can be ensured to be complete or balanced in pressure. A bypass is arranged beside the flow pump 14, can avoid the corrosion of a medium to a pump body and blades in a static test, and is made of polytetrafluoroethylene, corrosion-resistant alloy or PVC. Valves are mounted on both ends of the flow pump 14 and both ends of the bypass.
The flow meter 13 has two, one is mounted on the gas hose 2, and the other is mounted on the fixed pipe 5 at the liquid outlet end of the deposition tank 3, the former is used for measuring the flow rate of the gas, and the latter is used for measuring the flow rate of the liquid.
Except the test tube 7, other tube sections and the tank body are wrapped with heating insulation sleeves which are easy to assemble and disassemble, so that the temperature decrease and loss can be reduced as much as possible while the heating time is shortened.
2. Control and display system
The control and display system is used for controlling the test loop system and displaying relevant data of the test loop system.
The control and display system is connected with the electric heater 4, the temperature probe 11, the pressure probe 12, the flow meter 13 and the flow pump 14 in the test loop system, can receive the temperature detected by the temperature probe 11, the pressure detected by the pressure probe 12 and the flow rate detected by the flow meter 13, record the test time and display related data, and can also preset the temperature and the flow rate so as to control the power of the electric heater 4, the heating insulation sleeve and the flow pump 14, and automatically stop heating and pumping after the test time.
Second, use method of automatic simulation test device
The multifunctional automatic simulation test device for the corrosion of the top of the wet gas pipeline, provided by the invention, has multiple functions, so that the use methods of different functions are different.
1. Dynamic and static corrosion or scaling simulation test
When the multifunctional automatic simulation test device for the corrosion of the top of the wet gas pipeline provided by the invention is used for performing action and static simulation tests, referring to fig. 1, the use method is as follows:
(1) dynamic and static corrosion simulation test
a. Dynamic simulation test
Step 1: gradually polishing the sample to 1200 with water abrasive paper#Then, the sample is arranged at the corresponding position of the bottom surface of the test tube 7, the reference electrode 9 and the auxiliary electrode 8 are arranged in place, the valves at the two ends of the bypass are closed, the valves at the two ends of the flow pump 14 are opened, and the simulation solution is added into the deposition tank 3 until the liquid level reaches 2/3 of the deposition tank 3;
step 2: the temperature of the constant temperature bath 16 and the temperature of the fluid in the test tube 7 are respectively arranged in the control and display system, the valve of the gas cylinder 1 is opened to remove oxygen or introduce oxygen to the medium in the loop, and CO is introduced according to the requirement2Starting the flow pump 14 to a set flow rate when the pressure reaches a set pressure;
step 3: connecting the auxiliary electrode 8, the reference electrode 9 and the working electrode 10 with an electrochemical workstation, and acquiring an electrochemical characteristic curve such as a polarization curve, an alternating current impedance map and the like according to requirements;
step 4: after the test was completed, the test media (simulated solution) in the tube and the tank were evacuated and rinsed clean with deionized water.
For a sample (a weightlessness sample) used for a weightlessness test, the sample is cleaned firstly, then dried by cool air, and then put into a drying oven for drying for later use (for subsequent weightlessness, appearance analysis and the like).
b. Static simulation test
When the multifunctional automatic simulation test device for the corrosion of the top of the wet gas pipeline is used for static simulation test, except for the fact that the valves at two ends of the bypass are required to be opened and the valves at two ends of the flow pump 14 are required to be closed, other operations are the same as those of the dynamic simulation test.
(2) Dynamic and static scale simulation test
a. Dynamic simulation test
Step 1: gradually polishing the sample to 1200 with water abrasive paper#Then, the sample is arranged at the corresponding position of the bottom surface of the test tube 7, the reference electrode 9 and the auxiliary electrode 8 are arranged in place, the valves at the two ends of the bypass are closed, the valves at the two ends of the flow pump 14 are opened, and the simulation solution is added into the deposition tank 3 until the liquid level reaches 2/3 of the deposition tank 3;
step 2: placing the test tube 7 in a low-temperature ice salt bath, a constant-temperature water bath or an oil bath so as to simulate the corresponding scaling temperature gradient inside and outside the pipeline;
step 3: setting temperature in a control and display system, opening a valve of the gas cylinder 1, removing oxygen or introducing oxygen to a medium in a loop, and introducing CO according to requirements2Starting the flow pump 14 to a set flow rate when the pressure reaches a set pressure;
step 4: connecting the auxiliary electrode 8, the reference electrode 9 and the working electrode 10 with an electrochemical workstation, and acquiring an electrochemical characteristic curve such as a polarization curve, an alternating current impedance map and the like according to requirements;
step 5: after the test was completed, the test media (simulated solution) in the tube and the tank were evacuated and rinsed clean with deionized water.
For a sample (a weightlessness sample) used for a weightlessness test, the sample is cleaned firstly, then dried by cool air, and then put into a drying oven for drying for later use (for subsequent weightlessness, appearance analysis and the like).
b. Static simulation test
When the multifunctional automatic simulation test device for the corrosion of the top of the wet gas pipeline provided by the invention is used for carrying out static simulation test, the operation is the same as that of the dynamic simulation test except that the valves at the two ends of the bypass are required to be opened and the valves at the two ends of the flow pump 14 are required to be closed.
2. Evaluation test of anticorrosive efficacy
When the top corrosion and scaling automatic simulation test is carried out, if the corrosion inhibition and scale inhibition effects of the corrosion inhibitor need to be evaluated, the corrosion inhibitor with a certain concentration needs to be added together with a simulation liquid in advance according to the test requirements and purposes or added under pressure at any time in the test process on the basis of carrying out the top corrosion and scaling simulation test, and other operations are consistent with the operation steps of the corresponding test in the prior art.
It should be noted that the above-mentioned embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the protection scope of the present invention.
Claims (9)
1. The utility model provides a multi-functional automatic analogue test device of moisture pipeline top corruption which characterized in that comprises two major systems of test loop system, control and display system, wherein:
the test loop system includes: the device comprises a gas cylinder (1), a gas transmission hose (2), a deposition tank (3), an electric heater (4), a fixed pipe (5), a flexible composite pipe (6), a test pipe (7), an auxiliary electrode (8), a reference electrode (9), a working electrode (10), a temperature probe (11), a pressure probe (12), a flow meter (13), a flow pump (14) and a constant temperature bath kettle (16), wherein a liquid outlet is reserved at the middle lower part of the side surface of the deposition tank (3), a liquid return port is reserved at the middle upper part, a liquid injection port and an exhaust port are reserved at the top surface, a gas injection port and a liquid discharge port are reserved at the bottom surface, the liquid outlet and the liquid return port are respectively welded with the fixed pipe (5), a heating insulation sleeve which is easy to assemble and disassemble is wrapped outside the deposition tank (3), the electric heater (4) is placed in the deposition tank (3), the test pipe (7) is placed in the constant temperature bath kettle (16), both ends are provided with independent valves and flanges, the bottom surface is reserved with a gas injection port and a plurality of reference electrode mounting holes, the top surface is reserved with a liquid injection port, an exhaust port, a plurality of sample mounting holes, a plurality of working electrode mounting holes and a plurality of probe mounting holes, the side surface is reserved with an auxiliary electrode mounting hole, a sample (15) and an electrode are hermetically connected with a test tube (7), wherein after the working electrode (10) and the sample (15) are mounted on the test tube (7), the bottom surfaces of the working electrode and the sample are flush with the inner surface of the top of the test tube (7), both ends of the test tube (7) are respectively connected with a flexible composite tube (6) through flanges, the other ends of the two flexible composite tubes (6) are respectively connected with two fixed tubes (5) welded at a liquid outlet and a liquid return port of a deposition tank (3) through flanges, and a gas bottle (1) is respectively connected with the gas injection port, the gas outlet and the liquid return port of the deposition, The gas injection port of the test tube (7) is connected, the flowmeter (13) is respectively arranged on the gas transmission hose (2) and the fixed tube (5) positioned at the liquid outlet end of the deposition tank (3), the flow pump (14) is arranged on the fixed tube (5) positioned at the liquid outlet end of the deposition tank (3), a bypass is arranged beside the flow pump (14), and valves are respectively arranged at two ends of the flow pump (14) and two ends of the bypass;
the control and display system is used for controlling the test loop system and displaying relevant data of the test loop system.
2. The multifunctional automatic simulation test device for corrosion on top of wet gas pipeline according to claim 1, wherein the deposition tank (3) is made of polytetrafluoroethylene, corrosion resistant alloy or PVC.
3. The multifunctional automatic simulation test device for corrosion on the top of a heavy and wet gas pipeline according to claim 1, wherein the fixing pipe (5) is made of polytetrafluoroethylene, corrosion-resistant alloy or PVC.
4. The multifunctional automatic simulation test device for corrosion on top of wet gas pipeline according to claim 1, wherein the test tube (7) is made of PC transparent plastic with corrosion resistance, pressure resistance and temperature resistance.
5. The multifunctional moisture pipeline top corrosion automatic simulation test device according to claim 1, characterized in that the top surface of the test tube (7) has a thickening layer.
6. The multifunctional automatic simulation test device for the corrosion at the top of the wet gas pipeline according to claim 1, wherein a gas injection port on the test pipe (7) is close to an outlet end of the test pipe (7), a liquid injection port is close to an inlet end of the test pipe (7), a gas exhaust port is corresponding to the gas injection port, valves are installed at the gas injection port, the liquid injection port and the gas exhaust port, a sample installation hole is located in front of the gas exhaust port, a working electrode installation hole is located in front of the sample installation hole, and the distance between the foremost working electrode installation hole and the inlet end of the test pipe (7) is greater than or equal to 1.5 m.
7. The multifunctional automatic simulation test device for corrosion on the top of the wet gas pipeline according to claim 1, wherein the working electrode (10) and the test sample (15) are made of bare steel sheets for oil well pipes, bare steel sheets for gathering pipelines or partially damaged inner coating sheets of the bare steel sheets and the steel sheets.
8. The multifunctional automatic simulation test device for corrosion on the top of a wet gas pipeline according to claim 1, wherein the other pipeline sections and the tank body except the test pipe (7) are wrapped with heating insulation sleeves which are easy to assemble and disassemble.
9. The multifunctional automatic simulation test device for corrosion on top of wet gas pipeline according to claim 1, wherein the control and display system is connected with the electric heater (4), the temperature probe (11), the pressure probe (12), the flow meter (13) and the flow pump (14) in the test loop system, and is used for receiving the temperature detected by the temperature probe (11), the pressure detected by the pressure probe (12), the flow rate detected by the flow meter (13) and recording the test time and displaying the relevant data, and the temperature and the flow rate can be preset to control the power of the electric heater (4), the heating insulation sleeve and the flow pump (14), and the heating and the pumping are automatically stopped after the test time is up.
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| CN113959933A (en) * | 2021-10-14 | 2022-01-21 | 中海石油(中国)有限公司 | Deepwater multi-phase flow dynamic corrosion evaluation system and method |
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