CN113916759A - Dynamic cycle corrosion rate testing device and testing method - Google Patents
Dynamic cycle corrosion rate testing device and testing method Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 252
- 238000005260 corrosion Methods 0.000 title claims abstract description 74
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- 238000000034 method Methods 0.000 claims abstract description 31
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 142
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 90
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 45
- 238000000926 separation method Methods 0.000 claims description 41
- 239000001569 carbon dioxide Substances 0.000 claims description 35
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- 230000003628 erosive effect Effects 0.000 description 9
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Abstract
The invention relates to a testing device and a testing method, in particular to a dynamic cyclic corrosion rate testing device and a testing method. The testing device and the testing method install the testing pipe piece in the testing tank through the hanging piece picking and placing device, corrode the testing pipe piece through multiphase flow closed loop circulation, and detect the corrosion rate for many times in the experimental process. The testing device and the testing method can completely simulate the corrosion environment in the multiphase flow pipeline, and improve the accuracy of the experimental result; the picking and placing of the test pipe piece can be completed under the condition of belt pressure, so that the corrosion detection of the test pipe piece can be continuously carried out by a weighing method, or the corrosion rate of the test pipe piece can be detected on line, the experimental scientificity and operability are greatly improved, and the corrosion rate of each stage can be detected in the experimental process; the problem of current evaluation model inaccurate, and can not detect the corrosion rate of each stage is solved.
Description
Technical Field
The invention relates to a testing device and a testing method, in particular to a dynamic cyclic corrosion rate testing device and a testing method.
Background
After years of development, most of domestic oilfield produced fluids are high in water content and water-phase mineral content, and in addition, components such as CO2 and polymers are often accompanied in the produced fluids due to the application of secondary and tertiary oil recovery technologies, so that the corrosion in gathering and transportation pipelines is serious, and perforation leakage accidents are frequent. The oil field gathering and transportation pipeline has small pipe diameter, low flow, no facilities for receiving and sending balls and the like, and can not be used in intelligent internal detection and has high cost. The lack of detection technology makes the integrity management of the current oil field gathering and transportation pipelines far from meeting the increasingly strict national requirements on safe production and environmental protection.
The direct internal corrosion evaluation technique (ICDA) is an effective pipe integrity evaluation technique. The american society of corrosion engineers (NACE) issued 4 standards for ICDA in successive 2006 to 2016 for different pipelines carrying media. The evaluation mainly comprises four parts of pre-evaluation, indirect evaluation, direct detection and post-evaluation, wherein the indirect evaluation and the direct detection are the core steps of the ICDA. The technology for directly evaluating corrosion in multiphase flow pipelines promulgated in 2016 is applicable to oilfield gathering and transportation pipelines, but because the influence factors of corrosion in multiphase flow pipelines are complex, the standard does not recommend a specific evaluation model, and promulgation time is short, domestic oilfield gathering and transportation pipelines have the characteristics of high water content and the like compared with foreign pipelines, so that how to use relevant standards for guiding the direct evaluation of corrosion in oilfield gathering and transportation pipelines in China urgently needs to develop research and exploration, the existing evaluation model cannot directionally adjust gas-phase and liquid-phase medium components in the experimental process, so that the existing evaluation model has a gap with parameters in the actual use process, the existing testing device cannot test the corrosion rate in the testing process, and the corrosion rate can be detected only after shutdown and pressure relief.
Disclosure of Invention
The invention aims to provide the following steps: the dynamic circulating corrosion rate testing device and the testing method can accurately control the gas-liquid ratio, the testing pressure and the flow rate in the corrosion experiment, can completely simulate the corrosion environment in a multiphase flow pipeline, and can detect the corrosion rate of each stage in the experiment process.
The technical scheme of the invention is as follows:
the utility model provides a developments circulation corrosion rate testing arrangement, includes test tank, gas buffer tank, gas-liquid separation jar, gas mixing jar and cistern, its characterized in that: the gas mixing tank is communicated with the gas buffer tank through a gas booster pump and a communicating pipe, and the gas buffer tank is communicated with the test tank through the communicating pipe; the gas mixing tank is communicated with the gas-liquid separation tank through a dryer and a communicating pipe, and the gas-liquid separation tank and the liquid tank are respectively communicated with the test tank through the communicating pipe and the backpressure valve; the liquid tank is also communicated with the test tank through a variable-frequency booster pump and a communicating pipe.
The top of the test tank is provided with a hanging piece taking and placing device; the test tank is wrapped with an electric heater.
The hanging piece taking and placing device comprises a ball valve connecting seat, a ball valve, a pressure relief valve, a lifting and releasing connecting sleeve and a lifting and releasing connecting rod, wherein the ball valve, the pressure relief valve and the lifting and releasing connecting sleeve are sequentially arranged above the ball valve connecting seat from bottom to top; the bottom of the packing cock is fixedly provided with a hanging piece connecting rod; the ball valve connecting seat is connected with the test tank in a sealing way.
The bottom center of ball valve connecting seat be provided with the connecting block, in the outer wall that the connecting block passed the test jar extended to the test jar, the bottom end of lacing film connecting rod passed the connecting block and extended to in the test jar.
A gas flow controller is arranged on a communicating pipe between the gas buffer tank and the test tank; a pressure regulating valve is arranged on a communicating pipe between the gas flow controller and the gas buffer tank.
The gas flow controller is characterized in that a one-way valve A is arranged on a communicating pipe between the gas flow controller and the inlet of the test tank, the inlet of the one-way valve A is communicated with the gas flow controller, and the outlet of the one-way valve A is communicated with the inlet of the test tank.
The bottom center of the gas buffer tank is provided with an emptying valve, and the top of the gas buffer tank is provided with a safety valve and a pressure sensor A.
And a pneumatic valve A is arranged on a communicating pipe between the dryer and the gas-liquid separation tank, and a discharge valve is arranged on the communicating pipe between the pneumatic valve A and the gas-liquid separation tank through a branch pipe.
A liquid level meter is arranged on the gas-liquid separation tank; a pneumatic valve B is arranged on a communicating pipe between the gas-liquid separation tank and the back pressure valve, and a pressure sensor B is arranged on a communicating pipe between the pneumatic valve B and the gas-liquid separation tank.
The gas mixing tank is provided with a sampling port and a plurality of gas source connecting ports; a sampling valve is arranged on the sampling port; the air source connecting port is provided with an air source control valve.
And a carbon dioxide concentration detector is arranged on one side of the sampling port to test the concentration of carbon dioxide flowing into air from the sampling port.
A liquid flowmeter is arranged on a communicating pipe between the variable-frequency booster pump and the test tank, and a check valve B is arranged on the communicating pipe between the liquid flowmeter and the test tank; the inlet of the one-way valve B is communicated with the liquid flowmeter, and the outlet of the one-way valve B is communicated with the inlet of the test tank.
A safety overflow valve is arranged on a communicating pipe between the liquid tank and the backpressure valve; the liquid tank is also connected with the bottom center of the gas-liquid separation tank through a control valve and a communicating pipe.
A dynamic cycle corrosion rate test method is characterized in that: it comprises the following steps:
1) pulling up a lifting connecting rod of the dynamic circulating corrosion rate testing device to enable a hanging piece connecting rod to move into a lifting connecting sleeve, hanging a testing pipe piece at the bottom end of the hanging piece connecting rod after the hanging piece connecting rod is in place, pressing down the lifting connecting rod, and inserting the testing pipe piece into a testing tank;
2) injecting liquid medium into the liquid tank, opening a gas source control valve connected with a gas source connecting port of a gas source, and injecting carbon dioxide gas into the gas mixing tank;
3) starting the gas booster pump and the variable-frequency booster pump, pumping carbon dioxide gas in the gas mixing tank after the gas booster pump is started, and inputting the carbon dioxide gas into the test tank through the gas buffer tank, the pressure regulating valve and the gas flow controller in sequence; after the variable-frequency booster pump is started, inputting the liquid medium in the liquid drawing tank into the test tank;
4) dissolving carbon dioxide gas entering the test tank in a liquid medium, and eroding the test pipe piece by the liquid medium dissolved with the carbon dioxide and the carbon dioxide gas;
5) discharging the carbon dioxide gas and the liquid medium which are subjected to the erosion of the test pipe piece from an outlet of the test tank, and refluxing the liquid medium into the liquid tank through the safety overflow valve to perform liquid circulation; the carbon dioxide gas flows back to the gas-liquid separation tank, the gas entering the gas-liquid separation tank is subjected to gas-liquid separation, then is dried by a dryer and enters the gas mixing tank to be mixed with the carbon dioxide gas in the gas mixing tank, and gas circulation is carried out;
6) after the gas booster pump and the variable-frequency booster pump are started, the pressure of the pressure regulating valve is regulated according to the test requirement, so that the gas pressure in the test tank is regulated; adjusting the flow of the gas flow controller, thereby adjusting the gas flow in the test tank; adjusting the operating current and the operating voltage of the variable-frequency booster pump, so as to adjust the pressure and the flow of the liquid medium in the test tank; the gas and the liquid in the test tank are enabled to form the required gas-liquid ratio, pressure and flow rate;
7) after the gas booster pump and the variable-frequency booster pump are started, the electric heater on the test tank is started to heat gas and liquid in the test tank, so that the temperature of the gas and the liquid in the test tank reaches the test requirement, and a corrosion experiment is performed on the test pipe piece.
The test period is 0.5-5 h; and detecting the test duct piece for multiple times by using a detection method in the test period.
The detection method is a weighing method, and the specific process is as follows:
pulling up the lifting connecting rod to enable the packing cock to move to the position above the pressure release valve, and closing the ball valve after the packing cock is in place to separate the upper space of the ball valve from the test tank; after the ball valve is closed, the pressure release valve is opened to release gas between the ball valve and the packing cock, so that the phenomenon that the gas is sprayed outwards to hurt people when the test duct piece is taken and placed is avoided; after the gas release is finished, continuously pulling up the connection rod to enable the test duct piece at the bottom end of the hanging piece connection rod to move upwards into the lifting connection sleeve, taking down the test duct piece from the end of the hanging piece connection rod in the lifting connection sleeve, drying the test duct piece, weighing, and calculating the corrosion rate according to the weight of the test duct piece obtained by weighing;
after the completion of weighing, install the test section of jurisdiction at playing and put the lacing film connecting rod end in the connecting sleeve, push down and put the connecting rod, make the packing cock insert the relief valve below, the packing cock inserts behind the relief valve below, opens the ball valve, pushes down once more after opening the ball valve and plays and put the connecting rod, makes the test section of jurisdiction of lacing film connecting rod end pass ball valve, ball valve connecting seat in proper order and inserts the test jar, carries out the corrosion test to the test section of jurisdiction once more.
The detection method is a resistivity determination method, and the specific process is as follows:
and (3) connecting the test segment to a resistivity tester in the process of the step 1), monitoring the resistivity of the test segment on line by the resistivity tester in the step 8), and calculating the corrosion rate of the test segment by the resistivity of the test segment.
The test segment is spiral, one end of the test segment is connected with the anode of the resistivity tester, and the other end of the test segment is connected with the cathode of the resistivity tester.
The gas-liquid ratio in the test tank is 10:1, so that the corrosion influence of the entrainment phenomenon of gas on the test pipe piece is simulated.
The pressure in the test tank is as follows: 0 to 40 MPA.
The flow rate in the test tank is as follows: 5 to 10 m/s.
The temperature in the test tank is as follows: the temperature is room temperature to 200 ℃.
The invention has the beneficial effects that:
the dynamic circulating corrosion rate testing device and the testing method can simulate gas phase flow through gas circulation, can simulate liquid phase flow through liquid medium circulation, carry out erosion corrosion on the testing pipe piece through multiphase flow medium, and can accurately control gas-liquid ratio, testing pressure and flow rate in a corrosion experiment in the experiment process, thereby completely simulating the corrosion environment in a multiphase flow pipeline and improving the accuracy of the experiment result; the picking and placing of the test pipe piece can be completed under the condition of belt pressure, so that the corrosion detection of the test pipe piece can be continuously carried out by a weighing method, or the corrosion rate of the test pipe piece can be detected on line, the experimental scientificity and operability are greatly improved, and the corrosion rate of each stage can be detected in the experimental process; the problem of current evaluation model inaccurate, and can not detect the corrosion rate of each stage is solved.
Drawings
FIG. 1 is a schematic diagram of the structure of the testing device of the present invention;
fig. 2 is a schematic structural view of the hanging piece taking and placing device of the present invention.
In the figure: 1. a test tank, 2, a gas buffer tank, 3, a gas-liquid separation tank, 4, a gas mixing tank, 5, a liquid tank, 6, a gas booster pump, 7, a dryer, 8, a back pressure valve, 9, a variable frequency booster pump, 10, an electric heater, 11, a ball valve connecting seat, 12, a ball valve, 13, a pressure release valve, 14, a lifting connecting sleeve, 15, a lifting connecting rod, 16, a packing cock, 17, a hanging piece connecting rod, 18, a connecting block, 19, a gas flow controller, 20, a pressure regulating valve, 21, a one-way valve A, 22, an emptying valve, 23, a safety valve, 24, a pressure sensor A, 25, a pneumatic valve A, 26, a pressure release valve, 27, a liquid level meter, 28, a pneumatic valve B, 29, a pressure sensor B, 30, a sampling valve, 31, a gas source control valve, 32, a carbon dioxide concentration detector, 33, a liquid flow meter, 34, a one-way valve B, 35, a safety overflow valve, 36, a control valve, 37. the duct pieces were tested.
Detailed Description
The dynamic cycle corrosion rate testing method comprises the following steps:
the lifting connecting rod 15 of the dynamic circulation corrosion rate testing device is pulled upwards to enable the lifting connecting rod 15 to drive the hanging piece connecting rod 17 to go upwards through the packing cock 16, the hanging piece connecting rod 17 is enabled to move into the lifting connecting sleeve 14, after the hanging piece connecting rod 17 is in place, the testing segment 37 is hung at the bottom end of the hanging piece connecting rod 17, after the testing segment is installed, the lifting connecting rod 15 is pressed downwards, the lifting connecting rod 15 is enabled to sequentially pass through the packing cock 16, the hanging piece connecting rod 17 drives the testing segment 37 to go downwards, the testing segment 37 is inserted into the testing tank 1, and the packing cock 16 is in sealing connection with the ball valve connecting seat 11 when the testing segment 37 is inserted into the testing tank 1, so that the testing tank 1 is sealed, and gas leakage in the testing tank 1 is prevented.
The dynamic circulation corrosion rate testing device comprises a testing tank 1, a gas buffer tank 2, a gas-liquid separation tank 3, a gas mixing tank 4 and a liquid tank 5, wherein the gas mixing tank 4 is communicated with the gas buffer tank 2 through a gas booster pump 6 and a communicating pipe, and the gas buffer tank 2 is communicated with the testing tank 1 through the communicating pipe; the gas mixing tank 4 is communicated with the gas-liquid separation tank 3 through a dryer 7 (AHD 100721-0A type dryer) and a communicating pipe, and the gas-liquid separation tank 3 and the liquid tank 5 are respectively communicated with the test tank 1 through the communicating pipe and a backpressure valve 8; the liquid tank 5 is also communicated with the test tank 1 through a variable-frequency booster pump 9 and a communicating pipe; when the gas-liquid separation device works, CO2 gas in the gas mixing tank 4 is conveyed into the test tank 1 through the gas booster pump, a gas phase environment is formed in the test tank 1, the gas is discharged from the test tank 1 and then enters the gas-liquid separation tank 3 for gas-liquid separation, and the separated gas is dried by the dryer 7 and then enters the gas mixing tank 4, so that gas phase closed-loop circulation is performed; the liquid medium in the liquid tank 5 is conveyed into the test tank 1 through the variable-frequency booster pump 9, a liquid phase environment is formed in the test tank 1, and after being discharged from the test tank 1, the liquid medium returns to the liquid tank 5, so that closed-loop circulation of a liquid phase is performed; when gas phase and liquid phase are circulated in a closed loop mode, multiphase flow flows are formed in the test tank 1, and therefore the corrosion environment in the multiphase flow pipeline is simulated.
The top of the test tank 1 is provided with a hanging piece taking and placing device, the hanging piece taking and placing device is composed of a ball valve connecting seat 11, a ball valve 12, a pressure relief valve 13, a lifting and releasing connecting sleeve 14 and a lifting and releasing connecting rod 15, the ball valve 12, the pressure relief valve 13 and the lifting and releasing connecting sleeve 14 are sequentially arranged above the ball valve connecting seat 11 from bottom to top, the lifting and releasing connecting rod 15 is inserted on the lifting and releasing connecting sleeve 14, the bottom end of the lifting and releasing connecting rod 15 is provided with a packing cock 16, and the packing cock 16 is respectively connected with the ball valve 12 and the pressure relief valve 13 in a sliding and sealing manner; the bottom of the packing cock 16 is fixedly provided with a hanging piece connecting rod 17, the play and release connecting sleeve 14 has the function of righting the play and release connecting rod 15 to prevent the play and release connecting rod 15 from being inclined when being pressed down or pulled up, so that the packing cock 16 cannot be inclined when the play and release connecting rod 15 drives the packing cock 16 to move, the sealing performance of the packing cock 16 is ensured, and meanwhile, when the hanging piece connecting rod 17 is positioned in the play and release connecting sleeve 14, the packing cock and the test duct piece 37 can be conveniently detached and installed from the hanging piece connecting rod 17 through the play and release connecting sleeve; the ball valve connecting seat 11 is hermetically connected with the test tank 1; the center of the bottom of the ball valve connecting seat 11 is provided with a connecting block 18, the connecting block 18 penetrates through the outer wall of the test tank 1 and extends into the test tank 1, on one hand, the ball valve connecting seat 11 is used for installing the ball valve 12, and meanwhile, the top of the test tank 1 is sealed by matching with a packing cock 16; the bottom end of the hanging piece connecting rod 17 penetrates through the connecting block 18 and extends into the testing tank 1, and the hanging piece connecting rod 17 is used for connecting the testing pipe piece 37, so that the testing pipe piece 37 can be inserted into the testing tank 1 through the hanging piece connecting rod 17; the electric heater 10 is wrapped on the test tank 1, and the test tank 1 can be heated by the electric heater 10 during working, so that gas and liquid in the test tank 1 are heated, and the temperature of the multiphase flow medium is consistent with the actual condition.
A gas flow controller 19 (D07-9E type gas flow controller) is arranged on a communicating pipe between the gas buffer tank 2 and the test tank 1, and the gas buffer tank 2 is used for buffering gas through the gas buffer tank 2 when the gas phase flows and circulates, so that the gas pressure and flow fluctuation are reduced, and the gas phase flows stably; the gas flow controller 19 is used for controlling the gas flow so that the gas flow conforms to the actual use condition when the gas flows, thereby simulating the gas flow; a pressure regulating valve 20 (K84 series pressure regulating valve) is provided in a communication pipe between the gas flow controller 19 and the gas buffer tank 2, so that the pressure of the gas phase is regulated by the pressure regulating valve 20, and when the gas phase flows, the gas pressure is in accordance with the actual use condition; a one-way valve A21 is arranged on a communicating pipe between the gas flow controller 19 and the inlet of the test tank 1, the inlet of a one-way valve A21 is communicated with the gas flow controller 19, and the outlet of a one-way valve A21 is communicated with the inlet of the test tank 1 to control the flow direction, so that the multiphase flow medium in the test tank 1 cannot flow back to the gas booster pump 6, and the gas booster pump 6 is protected; the bottom center of gas buffer tank 2 is provided with atmospheric valve 22, and the top of gas buffer tank 2 is provided with relief valve 23 and pressure sensor A24, and pressure sensor A24's effect is the pressure when monitoring gas flow to carry out feedback control to gaseous phase pressure, keep gaseous phase pressure to be in the requirement within range all the time.
The gas-liquid separation tank 3 is provided with a liquid level meter 27; a pneumatic valve B28 is arranged on a communicating pipe between the gas-liquid separation tank 3 and the backpressure valve 8, and a pressure sensor B29 is arranged on a communicating pipe between the pneumatic valve B28 and the gas-liquid separation tank 3 to monitor the pressure when the gas flows back, so that the flowing pressure of the gas is adjusted by matching with the pressure sensor A24; a pneumatic valve A25 is arranged on a communicating pipe between the dryer 7 and the gas-liquid separation tank 3, a discharge valve 26 is arranged on the communicating pipe between the pneumatic valve A25 and the gas-liquid separation tank 3 through a branch pipe, the discharge valve 26 has the function of discharging gas reflowed by the test tank when the concentration of CO2 in gas phase is too low, and supplementing gas in the test tank 1 directly through CO2 gas in a gas source so that the concentration of CO2 gas is maintained in the range required by an experiment, and meanwhile, the pressure in the gas-liquid separation tank 3 can be discharged when the test device is shut down through the discharge valve 26, thereby reducing the pressure of the whole test device; the pneumatic valve A25 has the function of sealing the gas mixing tank 4 when the gas is discharged by using the discharge valve 26, so that waste caused by discharging CO2 gas in the gas mixing tank 4 is avoided; the center of the bottom of the gas-liquid separation tank 3 is connected with the liquid tank 5 through a control valve 36 and a communicating pipe, the liquid level meter 27 is used for conveniently monitoring the liquid level of the gas-liquid separation tank 3, so that the liquid level of the gas-liquid separation tank 3 is kept, the liquid level of the gas-liquid separation tank 3 is not too high, further, the liquid is not enabled to enter the dryer 7, the drying capacity of the dryer 7 is kept, the liquid level of the gas-liquid separation tank 3 is not too low, the gas-liquid separation tank 3 loses liquid sealing capacity, and the gas in the gas-liquid separation tank 3 is prevented from leaking from the liquid tank 5; the gas mixing tank 4 is provided with a sampling port and a plurality of gas source connecting ports, the gas source connecting ports are connected with a gas source, and the plurality of gas source connecting ports are arranged to facilitate the switching of the gas source when the gas source connected with the gas mixing tank 4 is used up, so that the timeliness of the switching is kept, and the continuous supply of CO2 gas by the gas source is ensured; a sampling valve 30 is arranged on the sampling port; a carbon dioxide concentration detector 32 (JH-TCQ-X (C) type carbon dioxide concentration detector) is arranged on one side of the sampling port to test the carbon dioxide concentration of the air flowing in from the sampling port, so as to detect the carbon dioxide concentration in the gas phase; and an air source control valve 31 is arranged on the air source connecting port to control the connection of the air source and the air mixing tank 4 and further control the switching of the air source.
A liquid flowmeter 33 (LDG type liquid flowmeter) is arranged on a communicating pipe between the variable-frequency booster pump 9 and the test tank 1 so as to monitor the flow rate of the liquid medium through the liquid flowmeter 33 and further facilitate the feedback regulation of the flow rate of the liquid medium; a one-way valve B34 is arranged on a communicating pipe between the liquid flowmeter 33 and the test tank 1; the inlet of the one-way valve B34 is communicated with the liquid flowmeter 33, the outlet of the one-way valve B34 is communicated with the inlet of the test tank 1, and the function of the one-way valve B34 is to prevent the gas phase from flowing back to the liquid tank 5, so that the gas phase is prevented from leaking from the liquid tank 5; a safety overflow valve 35 (a 41H type safety overflow valve) is arranged on a communicating pipe between the liquid tank 5 and the backpressure valve 8, the safety overflow valve 35 is used for passing through a liquid medium and not passing through gas, so that it is ensured that liquid only containing multiphase flow medium enters the liquid tank 5 through the safety overflow valve 35, gas flowing back from the test tank 1 cannot enter the liquid tank 5, and further gas is ensured not to be leaked from the liquid tank 5.
After the test tube piece 37 is inserted into the test tank 1, injecting a liquid medium into the liquid tank 5; the control valve 36 is closed to separate the liquid tank 5 from the gas-liquid separation tank 3, so that the CO2 gas is prevented from leaking from the gas-liquid separation tank 3 and the control valve 36 to the liquid tank 5 due to the fact that liquid is not accumulated in the gas-liquid separation tank 3 during gas phase circulation, and further gas leakage is avoided; after the control valve 36 is closed, the gas source control valve 31 connected with the gas source connecting port of the gas source is opened to inject carbon dioxide gas into the gas mixing tank 4;
starting a gas booster pump 6 and a variable frequency booster pump 9, pumping carbon dioxide gas in a gas mixing tank 4 after the gas booster pump 6 is started, and inputting the carbon dioxide gas into a test tank 1 through a gas buffer tank 2, a pressure regulating valve 20 and a gas flow controller 19 in sequence; after the variable-frequency booster pump 9 is started, the liquid medium in the liquid drawing tank 5 is input into the test tank 1;
dissolving carbon dioxide gas entering the test tank 1 in a liquid medium, simulating a corrosion environment in the multiphase flow pipeline through the liquid medium dissolved with the carbon dioxide and the carbon dioxide gas, and eroding the test tube piece 37 through the liquid medium dissolved with the carbon dioxide and the carbon dioxide gas, so that the corrosion of the corrosion environment in the multiphase flow pipeline on the pipeline and equipment is simulated through the erosion on the test tube piece 37;
discharging the carbon dioxide gas and the liquid medium which are subjected to the erosion of the test tube piece 37 from the outlet of the test tank 1, and refluxing the liquid medium to the liquid tank 5 through the safety overflow valve 35 to perform liquid circulation; the carbon dioxide gas flows back to the gas-liquid separation tank 3, the gas entering the gas-liquid separation tank 3 is subjected to gas-liquid separation, then is dried by the dryer 7 and enters the gas mixing tank 4 to be mixed with the carbon dioxide gas in the gas mixing tank 4, and gas circulation is carried out, wherein in the gas phase circulation process, the concentration of CO2 gas in the gas phase is monitored by sampling and detecting the gas in the gas mixing tank 4, and the concentration of CO2 gas is adjusted;
after the gas booster pump 6 and the variable-frequency booster pump 9 are started, the pressure of the pressure regulating valve 20 is regulated according to the test requirement, so that the gas pressure in the test tank 1 is regulated; adjusting the flow of the gas flow controller 19, thereby adjusting the gas flow in the test tank 1; the operation current and the operation voltage of the variable-frequency booster pump 9 are regulated, so that the pressure and the flow of the liquid medium in the test tank 1 are regulated; the gas-liquid ratio, the pressure and the flow rate required by the gas and the liquid in the test tank 1 are formed, the gas-liquid ratio in the test tank 1 is 10:1, and the corrosion influence of the entrainment phenomenon of the gas on the test pipe piece is simulated; the pressure in the test tank 1 was: 0-40 Mpa; the flow rates in the test tank 1 were: 5-10 m/s; the temperature inside the test tank 1 was: the temperature is room temperature to 200 ℃.
After the gas booster pump 6 and the variable frequency booster pump 9 are started, the electric heater 10 on the test tank 1 is started to heat the gas and the liquid in the test tank 1, so that the temperature of the gas and the liquid in the test tank 1 reaches the test requirement, and a corrosion experiment is performed on the test pipe piece 37.
The test period is 0.5-5 h; the test segment 37 is inspected multiple times during the test cycle by the inspection method.
The detection method is a weighing method, and the specific process is as follows:
pulling up the lifting connecting rod 15 to enable the packing cock 16 to move above the pressure release valve 13, and closing the ball valve 12 after the packing cock 16 is in place to separate the upper space of the ball valve 12 from the test tank 1; after the ball valve 12 is closed, the pressure release valve 13 is opened to release the gas between the ball valve 12 and the packing cock 16, so that the gas is prevented from being sprayed outwards to hurt people when the test segment 37 is taken and put; after the gas release is finished, continuously pulling up the connection rod 15 to enable the test tube piece 37 at the bottom end of the hanging piece connection rod 17 to move upwards into the lifting connection sleeve 14, taking down the test tube piece 37 from the end of the hanging piece connection rod 17 in the lifting connection sleeve 14, drying the test tube piece 37, weighing, and calculating the corrosion rate according to the weight of the test tube piece 37 obtained by weighing and the following formula;
the corrosion rate calculation formula is:
after weighing, install the test section of jurisdiction 37 and play the hanging piece connecting rod 17 end in putting the adapter sleeve 14, push down and put connecting rod 15, make packing cock 16 insert the relief valve 13 below, packing cock 16 inserts behind the relief valve 13 below, open ball valve 12, push down once more after opening ball valve 12 and put connecting rod 15, the test section of jurisdiction 37 that makes the hanging piece connecting rod 17 end passes ball valve 12 in proper order, ball valve connecting seat 11 inserts test tank 1, carry out corrosion test to test section of jurisdiction 37 once more.
As an improvement, the detection method can also be a resistivity measurement method, which comprises the following specific steps:
in the process of inserting the test tube piece 37 into the test tank 1, connecting the test tube piece 37 to a resistivity tester, wherein the test tube piece 37 inserted into the test tank 1 is spiral, one end of the test tube piece 37 is connected with the anode of the resistivity tester, and the other end of the test tube piece 37 is connected with the cathode of the resistivity tester; the erosion of the test segment 37 is carried out, so that the resistivity of the test segment 37 is monitored on line by a resistivity tester during the experiment, and the erosion rate of the test segment is calculated by the resistivity of the test segment 37 and the following formula;
the corrosion rate calculation formula is:
the dynamic circulating corrosion rate testing device and the testing method can simulate gas phase flow through gas circulation, can simulate liquid phase flow through liquid medium circulation, carry out erosion corrosion on the testing pipe piece through multiphase flow medium, and can accurately control gas-liquid ratio, testing pressure and flow rate in a corrosion experiment in the experiment process, thereby completely simulating the corrosion environment in a multiphase flow pipeline and improving the accuracy of the experiment result; the picking and placing of the test pipe piece can be completed under the condition of belt pressure, so that the corrosion detection of the test pipe piece can be continuously carried out by a weighing method, or the corrosion rate of the test pipe piece can be detected on line, the experimental scientificity and operability are greatly improved, and the corrosion rate of each stage can be detected in the experimental process; the problem of current evaluation model inaccurate, and can not detect the corrosion rate of each stage is solved.
Claims (9)
1. A dynamic cycle corrosion rate test method is characterized in that: it comprises the following steps:
1) pulling up a lifting connecting rod (15) of the dynamic circulating corrosion rate testing device to enable a hanging piece connecting rod (17) to move into a lifting connecting sleeve (14), hanging a testing pipe piece (37) at the bottom end of the hanging piece connecting rod (17) after the hanging piece connecting rod (17) is in place, pressing down the lifting connecting rod (15), and inserting the testing pipe piece (37) into a testing tank (1);
2) injecting a liquid medium into the liquid tank (5), opening a gas source control valve (31) connected with a gas source connecting port of a gas source, and injecting carbon dioxide gas into the gas mixing tank (4);
3) starting a gas booster pump (6) and a variable frequency booster pump (9), wherein after the gas booster pump (6) is started, carbon dioxide gas in a gas mixing tank (4) is extracted and is input into a test tank (1) sequentially through a gas buffer tank (2), a pressure regulating valve (20) and a gas flow controller (19); after the variable-frequency booster pump (9) is started, liquid medium in the liquid drawing tank (5) is input into the test tank (1);
4) carbon dioxide gas entering the test tank (1) is dissolved in the liquid medium, and the test tube piece (37) is eroded through the liquid medium dissolved with the carbon dioxide and the carbon dioxide gas;
5) carbon dioxide gas and liquid medium after the test tube piece (37) is eroded are discharged from an outlet of the test tank (1), and the liquid medium flows back to the liquid tank (5) through the safety overflow valve (35) to perform liquid circulation; the carbon dioxide gas flows back to the gas-liquid separation tank (3), the gas entering the gas-liquid separation tank (3) is subjected to gas-liquid separation, then is dried by the dryer (7), enters the gas mixing tank (4) and is mixed with the carbon dioxide gas in the gas mixing tank (4), and gas circulation is carried out;
6) after the gas booster pump (6) and the variable-frequency booster pump (9) are started, the pressure of the pressure regulating valve (20) is regulated according to the test requirement, so that the gas pressure in the test tank (1) is regulated; adjusting the flow of the gas flow controller (19) to thereby adjust the gas flow in the test tank (1); adjusting the operating current and the operating voltage of the variable-frequency booster pump (9), thereby adjusting the pressure and the flow rate of the liquid medium in the test tank (1); the gas and the liquid in the test tank (1) are enabled to form the required gas-liquid ratio, pressure and flow rate;
7) after the gas booster pump (6) and the variable-frequency booster pump (9) are started, the electric heater (10) on the test tank (1) is started to heat gas and liquid in the test tank (1), so that the temperature of the gas and the liquid in the test tank (1) reaches the test requirement, and a corrosion experiment is performed on the test pipe piece (37).
2. The dynamic cycle corrosion rate test method of claim 1, wherein: the test period is 0.5-5 h; the test segment (37) is inspected a plurality of times during a test cycle by an inspection method.
3. The dynamic cycle corrosion rate test method of claim 2, wherein: the detection method is a weighing method, and the specific process is as follows:
pulling up the lifting connecting rod (15) to enable the packing cock (16) to move above the pressure release valve (13), and closing the ball valve (12) after the packing cock (16) is in place to separate the upper space of the ball valve (12) from the test tank (1); after the ball valve (12) is closed, the pressure relief valve (13) is opened, and gas between the ball valve (12) and the packing cock (16) is released, so that the gas is prevented from being sprayed outwards to hurt people when the test segment (37) is taken and placed; after the gas release is finished, continuously pulling up the connection rod (15) to enable the test segment (37) at the bottom end of the hanging piece connection rod (17) to move upwards into the lifting connection sleeve (14), taking down the test segment (37) from the end of the hanging piece connection rod (17) in the lifting connection sleeve (14), drying the test segment (37), weighing, and calculating the corrosion rate according to the weight of the test segment (37) obtained by weighing;
after weighing, install lacing film connecting rod (17) end in playing and putting adapter sleeve (14) test section of jurisdiction (37), push down and play connecting rod (15), make packing cock (16) insert relief valve (13) below, packing cock (16) insert behind relief valve (13) below, open ball valve (12), push down again after opening ball valve (12) and play connecting rod (15), test section of jurisdiction (37) that makes lacing film connecting rod (17) end passes ball valve (12) in proper order, ball valve connecting seat (11) insert test jar (1), carry out corrosion test to test section of jurisdiction (37) once more.
4. The dynamic cycle corrosion rate test method of claim 2, wherein: the detection method is a resistivity determination method, and the specific process is as follows:
and (2) connecting the testing pipe piece (37) to a resistivity tester in the process of the step (1), monitoring the resistivity of the testing pipe piece (37) on line through the resistivity tester in the step (8), and calculating the corrosion rate of the testing pipe piece through the resistivity of the testing pipe piece (37).
5. The dynamic cycle corrosion rate test method of claim 4, wherein: the test tube piece (37) is spiral, one end of the test tube piece (37) is connected with the anode of the resistivity tester, and the other end of the test tube piece (37) is connected with the cathode of the resistivity tester.
6. The dynamic cycle corrosion rate test method of claim 1, wherein: the gas-liquid ratio in the test tank (1) is 10:1, so that the corrosion influence of the entrainment phenomenon of gas on the test pipe piece is simulated.
7. The dynamic cycle corrosion rate test method of claim 1, wherein: the pressure in the test tank (1) is as follows: 0 to 40 MPA.
8. The dynamic cycle corrosion rate test method of claim 1, wherein: the flow rate in the test tank (1) is as follows: 5 to 10 m/s.
9. The dynamic cycle corrosion rate test method of claim 1, wherein: the temperature in the test tank (1) is as follows: the temperature is room temperature to 200 ℃.
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