CN107796859B - Physical galvanic corrosion test device and test method - Google Patents
Physical galvanic corrosion test device and test method Download PDFInfo
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- CN107796859B CN107796859B CN201610806064.XA CN201610806064A CN107796859B CN 107796859 B CN107796859 B CN 107796859B CN 201610806064 A CN201610806064 A CN 201610806064A CN 107796859 B CN107796859 B CN 107796859B
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- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 238000005260 corrosion Methods 0.000 title claims abstract description 62
- 230000007797 corrosion Effects 0.000 title claims abstract description 62
- 238000010998 test method Methods 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 190
- 229910052751 metal Inorganic materials 0.000 claims abstract description 190
- 239000007788 liquid Substances 0.000 claims abstract description 71
- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 13
- 238000003860 storage Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 60
- 150000002739 metals Chemical class 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- -1 iron ions Chemical class 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910021645 metal ion Inorganic materials 0.000 description 4
- 238000009533 lab test Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
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- 238000009826 distribution Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
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- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides a kind of material couple corrosion test device and test method, the device includes: the device comprises a gas supply unit, a liquid supply unit, a pressure monitoring unit, a heat supply unit, a first pipeline, a first metal container and a second metal, wherein the second metal is accommodated in the first metal container and is in contact with the first metal container; the gas supply unit is communicated with a first interface of the first pipeline, the liquid supply unit is communicated with a second interface of the first pipeline, and the first metal container is communicated with a third interface of the first pipeline; the liquid valve is arranged between the liquid supply unit and the second interface, and the safety valve is arranged between the second interface and the third interface. The device is simple in composition, easy to operate, capable of being used in a laboratory and capable of truly restoring the field environment.
Description
Technical Field
The invention relates to a real object galvanic corrosion test device and a test method, belonging to the technical field of oil exploitation and environment-friendly materials.
Background
In the process of exploration and development of oil and gas fields, due to the complex and harsh environmental conditions, a downhole pipe column is often required to connect two metals made of different materials together for conveying oil and gas and the like. However, in the same conveying medium, due to different corrosion potentials, contact corrosion of different metals is easy to occur, namely galvanic corrosion occurs, which accelerates the phenomenon that a conveying pipeline is perforated or even broken due to the fact that a corrosion site is made of a material, seriously influences the underground conveying operation, and even causes extremely dangerous safety accidents. Therefore, the specific situation of galvanic corrosion of two different metals is very important for the oil and gas exploitation field.
At present, the galvanic corrosion test has two types: laboratory tests and field tests. Among them, laboratory tests can study the role of a certain factor alone or the combined role of several factors. On the premise of not changing the actual corrosion mechanism, the test condition can be strengthened, the corrosion test is accelerated, and the test period is shortened. However, the condition environment of the laboratory test is greatly different from the actual condition environment of the site, and actual site actual measurement data cannot be reflected. The field test can be carried out in an actual environment, and the data is real, representative and referential. However, the field test needs to actually test the buried pipeline at the bottom, the period is long, the installation of the test device is complicated, the production is influenced, and even safety accidents can be caused when the operation is improper.
Disclosure of Invention
The invention provides a real object galvanic corrosion test device and a test method, the device is simple in composition and easy to operate, can be used in a laboratory, can truly restore a field environment, faithfully reflects an actual use state of metal, and provides powerful data support for a field anticorrosion process.
The invention provides a kind of material couple corrosion test device, including:
the device comprises a gas supply unit, a liquid supply unit, a pressure monitoring unit, a heat supply unit, a first pipeline, a first metal container and a second metal, wherein the second metal is contained in the first metal container and is in contact with the first metal container;
the gas supply unit is communicated with a first interface of the first pipeline, the liquid supply unit is communicated with a second interface of the first pipeline, and the first metal container is communicated with a third interface of the first pipeline;
the liquid valve is arranged between the liquid supply unit and the second interface, and the safety valve is arranged between the second interface and the third interface;
the sampling device is characterized by further comprising a second pipeline, wherein an inlet of the second pipeline is communicated with the first metal container, and an outlet of the second pipeline is provided with a sampling valve.
In an embodiment, the liquid supply unit comprises a displacement pump and a liquid storage unit;
the displacement pump is communicated with the inlet of the liquid storage unit, and the outlet of the liquid storage unit is communicated with the second interface.
In one embodiment, the first metal container comprises a first metal pipe open at both ends, a first seal and a second seal; the first sealing element is used for sealing one opening of the first metal pipeline, and the second sealing element is used for sealing the other opening of the first metal pipeline.
In an embodiment, the third port communicates with the first metal container through the first metal pipe or the first seal;
the second pipe is communicated with the first metal container through the first metal pipeline or the second sealing piece.
In one embodiment, the pressure detection unit comprises a first pressure gauge and a second pressure gauge;
the first pressure gauge is arranged between the first interface and the second interface, and the second pressure gauge is arranged between the second interface and the third interface.
In an embodiment, the sampling valve further comprises a third pressure gauge disposed between the inlet of the second pipeline and the sampling valve.
The invention also provides a real galvanic corrosion test method, which is used for testing by using any one of the real galvanic corrosion test devices.
Further, the method comprises the following steps:
1) checking the gas tightness of the physical couple corrosion test device;
2) introducing a fluid medium into the first metal container;
3) controlling the temperature inside the first metal container to be a target temperature by adjusting the temperature of the heat supply unit;
4) controlling the pressure inside the first metal container to a target pressure by adjusting the intake pressure of the gas supply unit;
5) and (3) standing the material couple corrosion test device for 15-30 days, and then detecting the ion concentration of the fluid medium in the first metal container.
Further, the fluid medium comes from one or two of the gas supply unit or the liquid supply unit.
The real galvanic corrosion test device is simple in composition and can be used in a laboratory, the real galvanic corrosion test method is easy to operate, the field environment can be simulated really, the test conditions matched with the field environment are realized, the use state of a metal material is reflected really, the data is real and reliable, meanwhile, the real galvanic corrosion test method provided by the invention can be realized easily through the device, and powerful data support is provided for the field corrosion prevention process, so that the test device and the test method can effectively evaluate the galvanic corrosion.
Drawings
FIG. 1 is a schematic block diagram of a galvanic corrosion test apparatus for physical objects of the present invention;
FIG. 2 is a detailed schematic diagram of the physical couple corrosion test apparatus of the present invention;
fig. 3 is a specific corrosion image of a first metal container.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic block diagram of a real galvanic corrosion test apparatus of the present invention, fig. 2 is a detailed schematic diagram of the real galvanic corrosion test apparatus of the present invention, please refer to fig. 1 and fig. 2, the real galvanic corrosion test apparatus of the present invention includes a gas supply unit 1, a liquid supply unit 2, a pressure monitoring unit 3, a heat supply unit 4, a first pipeline, a first metal container 5 and a second metal 6, wherein the second metal 6 is accommodated in the first metal container 5 and is in contact with the first metal container 5, the heat supply unit 4 is configured to supply heat to the first metal container 5, and the pressure monitoring unit 3 is disposed on the first pipeline; the gas supply unit 1 is communicated with a first interface of the first pipeline, the liquid supply unit 2 is communicated with a second interface of the first pipeline, and the first metal container 5 is communicated with a third interface of the first pipeline; the liquid valve system further comprises a gas valve 11, a liquid valve 21 and a safety valve 12, wherein the gas valve 11 is arranged between the first connector and the second connector, the liquid valve 21 is arranged between the liquid supply unit 2 and the second connector, and the safety valve 12 is arranged between the second connector and the third connector. A second pipeline is also included, the inlet of the second pipeline is communicated with the first metal container 5, and the outlet of the second pipeline is provided with a sampling valve 51.
Specifically, the first metal container 5 and the second metal 6 are two metals to be detected for galvanic corrosion, respectively, wherein the first metal container 5 is a metal of an underground oil and gas conveying pipeline, and the second metal 6 is a metal connected with the underground oil and gas conveying pipeline, so that the first metal container 5 is a galvanic couple cathode of a test galvanic couple, and the second metal 6 is a galvanic couple anode of the test galvanic couple, and the area ratio of the two electrodes in a field environment can be simulated by adjusting the size of the second metal 6 in the invention.
The gas supply unit 1 is capable of providing gas into the first metal container 5 via the gas valve 11 and the first pipe, in the present invention, the gas supply unit 1 may be embodied as a gas cylinder, wherein the kind of the embodied supply gas may be determined according to the actual gas medium in the field environment.
The liquid supply unit 2 can supply liquid into the first metal container 5 through the liquid valve 21 and the first pipe, wherein the kind of the specific supply liquid can be determined according to the actual liquid medium in the field environment.
When the fluid medium in the real underground environment is gas, the gas valve 11 and the safety valve 12 can be opened by closing the liquid valve 21 to inject the gas into the first metal container 5 until the first metal container is full; when the fluid medium in the real underground environment is liquid, the liquid valve 21 and the safety valve 12 can be opened by closing the gas valve 11 to inject the liquid into the first metal container 5 until the first metal container is full; when the fluid medium in the real underground environment is a mixture of liquid and gas, the gas valve 11 may be closed, the liquid valve 21 and the safety valve 12 may be opened to inject the liquid into the first metal container 5, and then the liquid valve 21 may be closed, the gas valve 11 may be opened to inject the gas into the first metal container 5 until the first metal container is full, wherein the ratio of the two media, i.e., the gas and the liquid, is determined according to the underground real environment.
The safety valve 12 can prevent the fluid medium in the first metal container 5 from flowing backward back into the liquid supply unit 2 or the gas supply unit 1 during the test, and the safety valve 12 can be used as an emergency valve when the gas valve 11 or the liquid valve 21 is out of order. Meanwhile, the safety valve 12 can effectively improve the tightness of the device in the test process.
In addition, the pressure monitoring unit 3 can monitor the pressure environment in which the first metal container 5 is located in real time to provide a pressure consistent with the on-site environment, and the heat supply unit 4 can provide a temperature consistent with the on-site environment for the first metal container 5 and the second metal 6.
The material object galvanic corrosion test device has a simple structure, the first metal container 5 and the second metal 6 can simulate metal pipelines which are made of two different materials and are used for conveying oil gas and are connected together in a real underground environment, the gas supply unit 1 and the liquid supply unit 2 can provide fluid media which are the same as the real underground environment for the first metal container 5 and the second metal 6, the heat supply unit 4 can restore the temperature environment of the metal pipelines in the real underground environment, the pressure monitoring unit 3 can monitor the pressure environment of the first metal container 5 and the second metal 6 in real time, when the pressure environment of the first metal container 5 and the second metal 6 is not consistent with the pressure of the metal pipeline in the real underground environment, the pressure environment of the first metal container 5 and the second metal 6 can be the same as the pressure of the metal pipeline in the real underground environment by adjusting the gas amount of the gas supply unit 1. In conclusion, the working environment of the underground conveying pipeline can be simulated truly through the fluid medium, the temperature environment, the pressure environment and the type of the metal to be detected, so that the actual use state of the underground conveying pipeline can be reflected faithfully, the underground environment to be detected can be adjusted at any time according to different types, and the practicability is high.
In specific use, the conditions of each component in the device are firstly regulated and controlled according to the real underground environment, then the conditions are continued for a period of time (generally 0.5-1 month), the first metal container 5 and the second metal 6 are taken out for observation and measurement, and the fluid medium in the first metal container 5 is subjected to metal ion concentration detection (because the main pipeline for underground oil and gas transportation is generally made of steel materials, the concentration measurement of iron ions is generally carried out). If the concentration of the metal ions in the current fluid medium is not much different from that of the metal ions in the fluid medium before the test, and the first metal container 5 has a flat surface and no obvious corrosion is found, it can be judged that coupling corrosion hardly occurs between the two metals to be detected in the current fluid medium. If the surface of the taken first metal container 5 is uneven and has concave-convex phenomena or even perforations, the corrosion speed of the first metal in the current fluid medium can be judged by weighing the mass of the current first metal container 5 and according to the mass difference before and after the test; or measuring the average depth of the pits formed on the surface of the first metal, and judging the corrosion speed of the first metal in the current fluid medium. The device can simulate the environment of the metal pipeline in the underground environment, so that the obtained data is real and reliable, the future corrosion condition of the underground real pipeline can be evaluated and estimated through the obtained data, and the underground pipeline is maintained timely according to the corrosion condition.
In order to facilitate real-time monitoring of changes of the first metal container 5 and the second metal 6 in the test process, an inlet of the second pipeline is communicated with the first metal container 5, and an outlet of the second pipeline is provided with a sampling valve 51. In the process of the test, the sampling valve 51 can be controlled to make the fluid medium in the first metal container 5 flow out from the second pipeline, and then the concentration of the metal ions in the flowing fluid medium is detected, so as to determine whether the galvanic corrosion condition has occurred in the current time period. In order to facilitate the receiving of the outflowing fluid medium, the outlet of the second line can be inserted into the sampling container 7.
In the present invention, specifically, the liquid supply unit 2 may include a displacement pump 22 and a liquid storage unit 23, the displacement pump 22 being in communication with an inlet of the liquid storage unit 23, and an outlet of the liquid storage unit 23 being in communication with the second interface. When the liquid stored in the liquid storage unit 23 is the real liquid medium in the underground environment, the liquid valve 21 and the safety valve 12 may be opened, and the liquid stored in the liquid storage unit 23 is input into the first metal container 5 through the first pipeline by the displacement pump 22, generally, the first metal container 5 needs to be filled.
In order to facilitate the production of the first metal container 5, generally, the underground piping, i.e., the first metal piping 52 is directly used as a main body of the first metal container 5, and both ends of the first metal piping 52 are open, so that both ends of the first metal piping 52 can be closed by the first seal 53 and the second seal 54, respectively, to produce the first metal container 5 capable of containing liquid. Wherein the third port communicates with the first metal container 5 through the first metal pipe 52 or the first seal 53, and the second port communicates with the first metal container 5 through the first metal pipe 52 or the second seal 54. Since the first and second pipes are inserted into the openings of the first metal pipe 52 or the sealing member so as to communicate with the first metal container 5, respectively, it is generally necessary to test the airtightness of the first metal container 5 before the test in order to prevent the fluid medium in the first metal container from leaking. The specific test operation is as follows: the sampling valve 51 and the liquid valve 21 are closed, the gas valve 11 and the safety valve 12 are opened, the gas supply unit 1 is enabled to charge gas into the first metal container 5, if the tightness of the first metal container 5 is good, the pressure of the pressure monitoring unit 3 continuously rises until the gas is filled in the first metal container 5, and then the pressure in the pressure monitoring unit 3 is almost unchanged if the tightness is poor, so that the connection position needs to be adjusted to improve the tightness.
Further, in order to better monitor the pressure, the pressure monitoring unit comprises a first pressure gauge 31, a second pressure gauge 32; a first pressure gauge 31 is arranged between the first port and the second port, and a second pressure gauge 32 is arranged between the second port and the third port. A third pressure gauge 33 is also included, the third pressure gauge 33 being arranged between the inlet of the second line and the sample valve 51. Through the manometer of three distribution in first pipeline, the different positions of second pipeline, not only can accurate monitoring the device in each specific position the pressure be convenient for to the adjustment control of pressure, can also judge the specific position that pressure goes wrong fast when pressure problem appears.
Further, the heat supply unit 4 may be embodied as an oil bath pan in which the first metal container 5 is accommodated. Because the oil bath pot supplies heat stably, the temperature change is within the allowable error range under the set temperature, so the underground real temperature environment can be simulated more accurately. Meanwhile, when the tightness detection is carried out, if the tightness of the first metal container 5 is poor, the phenomenon of bubbling occurs in the oil bath, and the observation is convenient.
The invention also provides a real galvanic corrosion test method, which is used for testing by using any one of the real galvanic corrosion test devices, and the test method specifically comprises the following steps:
1) checking the gas tightness of the physical couple corrosion test device;
2) introducing a fluid medium into the first metal container;
3) controlling the temperature inside the first metal container to be a target temperature by adjusting the temperature of the heat supply unit;
4) controlling the pressure inside the first metal container to a target pressure by adjusting the intake pressure of the gas supply unit;
5) and (3) standing the material couple corrosion test device for 15-30 days, and then detecting the ion concentration of the fluid medium in the first metal container.
After the test device is assembled, the air tightness of the device needs to be detected firstly, and only when the air tightness of the device is good, the subsequent test work can be carried out.
When the air tightness of the device is good, a fluid medium can be introduced into the first metal container, the specific type of the fluid medium is determined according to the fluid medium of the underground real environment, and the fluid medium is from one or both of the gas supply unit and the supply unit. Specifically, when the fluid medium is liquid, the gas valve needs to be closed, the liquid valve and the safety valve need to be opened, and the corresponding liquid medium is introduced into the first metal container; when the fluid medium is gas, the liquid valve needs to be closed, the gas valve and the safety valve need to be opened, and the corresponding gas medium is introduced into the first metal container; when the fluid medium is a mixture of gas and liquid, the gas valve needs to be closed, the liquid valve and the safety valve need to be opened, the corresponding liquid medium is introduced into the first metal container, the liquid valve is closed, the gas valve is opened, and the corresponding gas medium is introduced into the first metal container.
After the fluid medium is introduced, all valves in the device are closed, and the temperature in the first metal container and the pressure in the first metal container are respectively controlled by adjusting the temperature of the heat supply unit and the air inlet pressure of the gas supply unit until the temperature in the first metal container is the target temperature and the pressure in the first metal container is the target pressure. The target temperature referred to herein is the temperature of the underground real environment, and the target pressure is the pressure of the underground real environment.
When the above conditions are ready, the apparatus is left standing for 15-30 days, if the first metal and the second metal are subjected to coupling corrosion in the fluid medium under test, the ion concentration in the fluid medium is significantly changed (generally, the iron ion concentration) compared with that before the test, and the first metal container is subjected to surface unevenness or even perforation. That is to say: if the first metal container has the phenomenon of uneven surface or even perforation, coupling corrosion between two metals inevitably occurs in the current fluid medium, and the corrosion speed of the first metal in the current fluid medium can be judged by weighing the mass of the current first metal container and according to the mass difference before and after the test; or the average depth of the pits formed on the surface of the first metal is measured, and the corrosion speed of the first metal in the current fluid medium is judged; if the surface of the first metal container is not obviously changed, but the ion concentration in the fluid medium is changed compared with that before the test, the coupling corrosion phenomenon of the two metals in the current fluid medium in the current test time length can be judged not to be serious; if the surface of the first metal container is not obviously changed and the ion concentration in the fluid medium is not obviously changed compared with that before the test, it can be judged that the two metals are not subjected to coupling corrosion in the current fluid medium within the current test time. Therefore, the method can evaluate and estimate future corrosion conditions of the underground real pipeline through the obtained data, and then timely maintain the underground pipeline according to the corrosion conditions.
Detailed description of the preferred embodiments
The following will make the description of the apparatus and method of the present invention more clear by the concrete method of using the apparatus for testing galvanic corrosion of real object of the present invention.
Firstly, two metals to be detected are determined, the metal of an underground conveying pipeline is used as a first metal, the metal connected with the underground conveying pipeline is used as a second metal 6, after the determination is finished, the first metal is made into a first metal container 5, and the electrode area ratio of the first metal to the second metal 6 is adjusted by adjusting the size of the second metal 6. In order to facilitate the manufacture of the first metal container 5, the first metal pipeline 52 which is the same as the underground conveying pipeline can be directly selected as the main body of the first metal container 5, and the two ends of the first metal pipeline 52 are sealed by two sealing parts. In this embodiment, the first metal pipe 52 is a 500mm long carbon steel casing and the second metal 6 is a tubing coupling of 13Cr type carbon steel. The gas in the gas supply unit 1 is nitrogen and carbon dioxide, the liquid in the liquid supply unit 2 is water (the concentration of iron ions is 3mg/L), and the heat supply unit 4 is an oil bath pan.
The assembly of the device is then completed in the connection relationship of fig. 2.
After the assembly is completed, the air tightness of the first metal container 5 is detected, and the method comprises the following specific operations: closing the liquid valve 21 and the sampling valve 51, opening the gas valve 11, enabling the pressure to be consistent with the pressure of the underground environment, inflating the first metal container 5, judging whether the tightness is good or not by detecting whether bubbles appear in the oil bath at each connection part of the first metal container 5, if not, indicating that the tightness is good, and if so, indicating that the tightness is poor, so that corresponding adjustment is made until the tightness is good.
When the first metal container 5 is detected to have good tightness, the gas valve 11 is closed and the liquid valve 21 is opened because the fluid medium of the real underground environment is water, and the liquid valve 21 is closed until the first metal container 5 is filled with water.
And then, adjusting the temperature of the oil bath according to the temperature of the real underground environment to enable the first metal container 5 to be at the target temperature, opening the gas valve 11 according to the pressure of the real underground environment, and closing the gas valve 11 when the first pressure gauge 31, the second pressure gauge 32 and the third pressure gauge 33 are all at the target pressure. At this time, the first metal container 5 and the second metal 6 are disposed in a real underground environment.
After one month, the sampling valve 51 is opened to take a little liquid from the outlet of the second pipeline for iron ion concentration detection, the iron ion concentration is 90mg/L, and compared with the iron ion concentration (3mg/L) before the test, the iron ion concentration is obviously increased, so that the serious galvanic corrosion of the first metal container 5 and the second metal 6 can be judged. All valves are then closed and the first metal container 5 and the second metal 6 are removed for viewing, fig. 3 is a detailed corrosion image of the first metal container.
The test device provided by the invention is simple in composition, can truly restore the working environment of the underground oil and gas transmission pipeline, truly reflects the specific use state of the metal material, is real and reliable in data, and provides a powerful test basis for the field anticorrosion process.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A kind of material couple corrosion test device, characterized by that, comprising:
the device comprises a gas supply unit, a liquid supply unit, a pressure monitoring unit, a heat supply unit, a first pipeline, a first metal container and a second metal, wherein the second metal is contained in the first metal container and is in contact with the first metal container;
the gas supply unit is communicated with a first interface of the first pipeline, the liquid supply unit is communicated with a second interface of the first pipeline, and the first metal container is communicated with a third interface of the first pipeline;
the liquid valve is arranged between the liquid supply unit and the second interface, and the safety valve is arranged between the second interface and the third interface;
the inlet of the second pipeline is communicated with the first metal container, and the outlet of the second pipeline is provided with a sampling valve;
the first metal container comprises a first metal pipeline with two open ends, a first sealing element and a second sealing element; the first sealing element is used for sealing one opening of the first metal pipeline, and the second sealing element is used for sealing the other opening of the first metal pipeline;
the first metal container is made of metal of an underground oil and gas conveying pipeline, and the second metal is metal connected with the underground oil and gas conveying pipeline.
2. The physical galvanic corrosion test apparatus according to claim 1, wherein said liquid supply unit comprises a displacement pump and a liquid storage unit;
the displacement pump is communicated with the inlet of the liquid storage unit, and the outlet of the liquid storage unit is communicated with the second interface.
3. The physical galvanic corrosion test apparatus according to claim 2, wherein said third port is in communication with said first metal container through said first metal conduit or said first seal;
the second pipe is communicated with the first metal container through the first metal pipeline or the second sealing piece.
4. The physical galvanic corrosion test device according to claim 3, wherein said pressure monitoring unit comprises a first pressure gauge and a second pressure gauge;
the first pressure gauge is arranged between the first interface and the second interface, and the second pressure gauge is arranged between the second interface and the third interface.
5. The test device of claim 4, further comprising a third pressure gauge disposed between the inlet of the second pipeline and the sampling valve.
6. A method for testing galvanic corrosion, characterized in that the device of any one of claims 1 to 5 is used for testing galvanic corrosion.
7. The method for testing galvanic corrosion of claim 6, comprising the steps of:
1) checking the gas tightness of the physical couple corrosion test device;
2) introducing a fluid medium into the first metal container;
3) controlling the temperature inside the first metal container to be a target temperature by adjusting the temperature of the heat supply unit;
4) controlling the pressure inside the first metal container to a target pressure by adjusting the intake pressure of the gas supply unit;
5) and (3) standing the material couple corrosion test device for 15-30 days, and then detecting the ion concentration of the fluid medium in the first metal container.
8. The galvanic corrosion test method according to claim 7, wherein said fluid medium is derived from one or both of said gas supply unit or liquid supply unit.
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| CN102072873A (en) * | 2009-11-25 | 2011-05-25 | 中国石油天然气集团公司 | Experiment device for couple corrosion |
| CN202486033U (en) * | 2012-02-13 | 2012-10-10 | 云南煤化工应用技术研究院 | Experimental device for medium corrosion resistance |
| CN202837152U (en) * | 2012-11-09 | 2013-03-27 | 安徽省电力科学研究院 | Corrosion test device for galvanic couple in soil medium |
| CN105891094A (en) * | 2016-04-05 | 2016-08-24 | 合肥通用机械研究院 | Corrosion testing device capable of simulating complex environment and testing method thereof |
| CN206161494U (en) * | 2016-09-06 | 2017-05-10 | 中国石油天然气股份有限公司 | Physical couple corrosion test device |
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| CN102072873A (en) * | 2009-11-25 | 2011-05-25 | 中国石油天然气集团公司 | Experiment device for couple corrosion |
| CN202486033U (en) * | 2012-02-13 | 2012-10-10 | 云南煤化工应用技术研究院 | Experimental device for medium corrosion resistance |
| CN202837152U (en) * | 2012-11-09 | 2013-03-27 | 安徽省电力科学研究院 | Corrosion test device for galvanic couple in soil medium |
| CN105891094A (en) * | 2016-04-05 | 2016-08-24 | 合肥通用机械研究院 | Corrosion testing device capable of simulating complex environment and testing method thereof |
| CN206161494U (en) * | 2016-09-06 | 2017-05-10 | 中国石油天然气股份有限公司 | Physical couple corrosion test device |
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