CN113075355A - Multifunctional corrosion inhibitor testing device and testing method thereof - Google Patents
Multifunctional corrosion inhibitor testing device and testing method thereof Download PDFInfo
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- CN113075355A CN113075355A CN202010006243.1A CN202010006243A CN113075355A CN 113075355 A CN113075355 A CN 113075355A CN 202010006243 A CN202010006243 A CN 202010006243A CN 113075355 A CN113075355 A CN 113075355A
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- 238000012360 testing method Methods 0.000 title claims abstract description 131
- 230000007797 corrosion Effects 0.000 title claims abstract description 21
- 238000005260 corrosion Methods 0.000 title claims abstract description 21
- 239000003112 inhibitor Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 238000010998 test method Methods 0.000 claims abstract description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 54
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 41
- 239000001569 carbon dioxide Substances 0.000 claims description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 27
- 239000007789 gas Substances 0.000 claims description 19
- 229910052757 nitrogen Inorganic materials 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 11
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- 238000011156 evaluation Methods 0.000 description 7
- 238000010926 purge Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002332 oil field water Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241001411320 Eriogonum inflatum Species 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The invention provides a multifunctional corrosion inhibitor test device and a test method thereof, wherein the test device comprises: a incubator main body in which a plurality of test containers can be accommodated; the main pipeline is connected to the thermostat main body and is provided with a port for connecting an air source and a water source; the valves and branch pipelines are connected between the main pipeline and each test container to realize the connection and control of each test container. The test device can reduce the process of repeated operation and improve the working efficiency.
Description
Technical Field
The invention belongs to the technical field of oilfield produced water evaluation devices, and particularly relates to a multifunctional corrosion inhibitor test device and a test method thereof for evaluating the performance of a corrosion inhibitor for oilfield produced water.
Background
The invention is mainly based on the performance evaluation method of corrosion inhibitor for oil field produced water SY/T5273-2000 issued by the national oil and chemical industry bureau:
3.6.3 when the test medium is oilfield produced water, purging the bottle with lower mouth with nitrogen, removing air, collecting water sample by exhaust sampling method, and strictly preventing air from entering, wherein the rest is performed according to SY/T5329-94 regulation of 5.1. The sample is sealed after field sampling and used within 24 h. The main ionic components, dissolved oxygen, hydrogen sulfide, aggressive carbon dioxide, pH value, SRB, TCB, oil content, suspended matter content, etc. were measured according to SY5523 and SY/T5329, respectively.
3.6.4 the test medium adopts self-prepared simulated water, and can be prepared by using a reagent meeting the requirements and a third-level reagent meeting GB/T6682 according to the actual water quality and the main ionic components on site. And (4) using nitrogen to drive oxygen for 2-4 hours. When the oxygen content in the water meets the requirement, carbon dioxide is introduced by using a gas cylinder or hydrogen sulfide is introduced by using a Kipp's generator, so that the self-prepared simulated water can simulate the field produced water to the maximum extent.
3.6.6 the test vessel was purged with nitrogen to remove air and the test media was introduced into the test vessel separately with a rubber tube. When the rubber tube is guided in, the rubber tube should be inserted below the liquid level and tightly attached to the bottle wall to prevent air from entering. Then the rubber tube is gradually raised along with the rise of the liquid level, and a test piece is hung when the liquid level reaches the bottle neck and is sealed by a rubber bottle stopper. Meanwhile, a blank test without adding a corrosion inhibitor is carried out.
3.6.8 the test device is placed in a thermostat and held at a set temperature for a test period.
According to the contents of the four conditions above the industry standard, the four steps are summarized into three steps for a test container by combining the test operation for years: 1. purging with nitrogen; 2. injecting the water into oilfield produced water; 3. carbon dioxide was blown in. The three steps are operated according to the industry standard, and the following problems exist: firstly, the operation is complicated, the test containers need to be subjected to repeated operation one by one, and time and labor are wasted; secondly, the blowing of carbon dioxide cannot be realized in time when a problem occurs in the midway of the test, so that the deviation of an evaluation result is caused, and the accuracy of detection data is influenced; thirdly, the working efficiency is low and the labor intensity is high. Only a single test container can be operated each time, the operation on a plurality of test containers cannot be synchronously completed once under the condition of ensuring the uniform state, and the repeated operation is more and needs to be improved; fourthly, the waste of special gas is serious, and the potential safety hazard is increased; fifthly, no special equipment is available in the market at present, and the equipment is needed to fill the blank.
Disclosure of Invention
Aiming at part or all of the technical problems in the prior art, the invention provides a multifunctional corrosion inhibitor test device which can reduce the repeated operation process and improve the working efficiency.
In order to achieve the above object, in one aspect, the present invention provides a multifunctional corrosion inhibitor testing apparatus, including:
a incubator main body in which a plurality of test containers can be accommodated;
the main pipeline is connected to the thermostat main body and is provided with a port for connecting an air source and a water source;
the valves and branch pipelines are connected between the main pipeline and each test container to realize the connection and control of each test container.
In one embodiment, the main pipeline is a U-shaped main pipeline, one end of the U-shaped main pipeline is provided with an air inlet main pipe interface and an air inlet main pipe three-way valve, and the other end of the U-shaped main pipeline is provided with a main pipe water inlet valve.
In one embodiment, a water pump switch and a water inlet interface are arranged on the thermostat box main body, and the water pump switch and the water inlet interface are arranged at one end of the thermostat box main body and are close to one side of a main pipe water inlet valve on a U-shaped main pipe; the water inlet interface is arranged at the lower side of the thermostat main body and is connected to a main pipe water inlet valve on a U-shaped main pipeline through a connecting pipe.
In one embodiment, the thermostat main body is further provided with a temperature controller and a main power switch, the temperature controller is arranged on the thermostat main body and is provided with a temperature controller display screen on one side of the thermostat main body, and the main power switch is arranged on the same side of the thermostat main body.
In one embodiment, two ends of the U-shaped main pipeline are provided with main pipeline lifting frames.
In one embodiment, the test container is provided with a test container cover, and the test container cover is also provided with a one-way exhaust and drainage valve for connecting an external exhaust system and a drainage system, wherein the exhaust and drainage valve isolates the inside of the test container from the external air.
In one embodiment, the U-shaped main pipeline is provided with an intermediate valve at the joint of the two end pipes, and the two sides of the U-shaped main pipeline are separated.
In one embodiment, install thing networking module and water level measurement ware on the incubator main part, thing networking module includes remote monitoring and time switch, the water level measurement ware is connected with experimental container.
On the other hand, the invention also discloses a test method adopting the multifunctional corrosion inhibitor test device, which adopts the test device and comprises the following steps:
setting the required temperature of the thermostat main body;
one end of a U-shaped main pipeline of the main pipeline is used as a gas input end and is connected with a nitrogen cylinder and a carbon dioxide cylinder through a valve, and the other end of the U-shaped main pipeline is used as a liquid input end;
opening a nitrogen gas port end connected with a nitrogen gas bottle, blowing the test container for 2 hours, and then closing the test container; opening the valve end of the water inlet valve, and synchronously injecting water into each test container; after the water level reaches the required height, closing the inlet valve end;
and hanging a test piece into the test container, and opening a valve connected with the end of the carbon dioxide gas cylinder to blow carbon dioxide.
Furthermore, the main pipeline is connected with a three-way valve which is respectively connected with a nitrogen cylinder, a carbon dioxide cylinder and a main pipeline channel; the middle part of the U-shaped main pipeline is provided with a middle valve, and when the middle valve is opened, the test containers on two sides can realize gas injection or water injection. When the middle valve is closed, different gases or liquids can be respectively injected from two sides to carry out different gas or liquid tests.
Compared with the prior art, the invention has the advantages that:
the invention improves the three-step one-to-one operation of nitrogen purging, injection of oilfield produced water and blowing of carbon dioxide gas into three-step one-to-many operation, thereby reducing the repeated operation labor. Through a plurality of interfaces of a U type main pipeline, realize once sweeping, pouring into oil field extraction water, blowing carbon dioxide gas to a plurality of test container's nitrogen gas, alleviate the process of repetitive operation, improve work efficiency. Meanwhile, the device realizes multiple purposes by one pipe, and blows gas and injects water through a U-shaped main pipeline to finish a plurality of test workloads at one time. In addition, redundant devices of the equipment are reduced, the structure is simple, the function is strong, the test operation is greatly facilitated, and the effects of high efficiency, rapidness, energy conservation and safety are achieved.
Drawings
Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic structural diagram of one embodiment of the multifunctional corrosion inhibitor testing device of the present invention.
FIGS. 2 and 3 show the connection of the main body of the incubator with the nitrogen cylinder, the carbon dioxide cylinder and the oil field water outlet container, respectively, of the multifunctional corrosion inhibitor testing device of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
In order to make the technical solutions and advantages of the present invention more apparent, exemplary embodiments of the present invention are described in further detail below with reference to the accompanying drawings. It is clear that the described embodiments are only a part of the embodiments of the invention, and not an exhaustive list of all embodiments. And the embodiments and features of the embodiments may be combined with each other without conflict.
The inventor notices in the invention process that four terms in the industry standard according to 'Corrosion inhibitor performance evaluation method for oilfield produced water' SY/T5273-2000 are provided: 3.6.3, respectively; 3.6.4, respectively; 3.6.6, respectively; 3.6.8, in practical application and operation, the following problems exist: firstly, the operation is complicated, the test containers need to be subjected to repeated operation one by one, and time and labor are wasted; secondly, the blowing of carbon dioxide cannot be realized in time when a problem occurs in the midway of the test, so that the deviation of an evaluation result is caused, and the accuracy of detection data is influenced; thirdly, the working efficiency is low and the labor intensity is high. Only a single test container can be operated each time, the operation on a plurality of test containers cannot be synchronously completed once under the condition of ensuring the uniform state, and the repeated operation is more and needs to be improved; fourthly, the waste of special gas is serious, and the potential safety hazard is increased; fifthly, no special equipment is available in the market at present, and the equipment is needed to fill the blank.
Aiming at the defects, according to four terms in the industrial standard SY/T5273-2000 of corrosion inhibitor performance evaluation method for oilfield produced water: 3.6.3, 3.6.4, 3.6.6, 3.6.8, in conjunction with laboratory testing procedures, invented the test apparatus. The test device can be greatly convenient for the performance evaluation method of the corrosion inhibitor for the oilfield produced water in SY/T5273-2000 industry standard, and the four tests are performed on the test container: the improvement of test operation modes such as nitrogen purging, oilfield produced water injection, carbon dioxide introduction, constant temperature control and the like greatly facilitates the operation process, and the single and repeated operation of nitrogen purging, oilfield produced water injection and carbon dioxide introduction of individual test containers is transformed into the operation of one-time synchronous nitrogen purging, oilfield produced water injection, carbon dioxide introduction and constant temperature control of a test period for a plurality of test containers. After transformation, the equipment device can greatly improve the operation flows of the four test steps, so that the test operation becomes more convenient, quicker, more efficient and safer, and possibility is provided for further perfecting the operation rules of the industry standard and operating instruments and equipment in a unified manner.
More specifically, the embodiment of the invention provides a multifunctional corrosion inhibitor testing device and a testing method thereof, which are described in detail below.
FIG. 1 shows one embodiment of the multifunctional corrosion inhibitor testing device of the present invention. In this embodiment, the multifunctional corrosion inhibitor testing apparatus of the present invention mainly includes: incubator main body 10, main line 15, valves and branch lines 5. Wherein, a plurality of test containers 4 can be accommodated in the incubator body 10. The main pipeline 15 is connected to the incubator body 10, and the main pipeline 15 is provided with a connector for connecting an air source and a water source. The valves 3, 6 and 11 and the branch pipelines 5, the main pipe air inlet valve 3 and the main pipe water inlet valve 11 are connected to the main pipeline 15, and the branch pipeline valves are arranged on the branch pipelines 5 or inlets of the test containers 4, so that the connection and control of the test containers 4 are realized.
In one embodiment, as shown in fig. 1, the main line 15 is a U-shaped main line. One end of the U-shaped main pipeline 15 is provided with an air inlet main pipe interface 2 and a main pipe air inlet valve 3. Preferably, the main pipe air inlet valve 3 is a three-way valve. The other end of the U-shaped main pipeline 15 is connected with a main pipeline water inlet valve 11.
In one embodiment, as shown in fig. 1, the thermostat body 10 is provided with a water pump switch 14 and a water inlet port 12. Wherein, the water pump switch 14 mainly is the start-stop of control water pump, realizes the water injection. The water pump switch 14 and the water inlet port 12 are disposed at one end of the main thermostat body 10, close to one side of the main water inlet valve 11 on the U-shaped main pipeline, i.e., the left side in fig. 1, and are not disposed on the same side as the water pump switch 14. The water inlet port 12 is provided on the lower side of the incubator main body 10 and is connected to the main pipe water inlet valve 11 on the U-shaped main pipe line through a connection pipe.
In one embodiment, as shown in fig. 1, the thermostat body 10 is further provided with a thermostat 1 and a main power switch 13. The temperature controller 1 is arranged on the thermostat main body 10, and a temperature controller display screen is arranged on one side of the thermostat main body 10 and can display the temperature in the temperature controller 1 in real time. The temperature controller 1 stores the oil field water and the test steel sheet. The main power switch 13 is provided on the same side of the incubator main body 10, and is arranged side by side near the water pump switch 14.
In one embodiment, as shown in fig. 1, the U-shaped main pipeline 15 is provided with main pipeline cranes 8 at both ends. One of the main pipeline lifting frames 8 is arranged at the open end of the U-shaped main pipeline 15 and is positioned behind the main pipeline air inlet valve 3 and the main pipeline water inlet valve 11. The other main pipeline crane 8 is arranged at the U-shaped part of the U-shaped main pipeline 15 and is positioned at the rear part of the U-shaped main pipeline 15.
In one embodiment, as shown in FIG. 1, a test container lid is provided on the test container 4. The test container cover is also provided with a one-way exhaust and drainage valve 7 for connecting an external exhaust system and a drainage system. The air discharge/drain valve 7 isolates the inside of the test container 4 from the outside air.
In one embodiment, as shown in fig. 1, the U-shaped main pipeline 15 is provided with an intermediate valve 9 at the junction of the two end pipes, and is located at the junction of the two side pipes of the U-shaped main pipeline to separate the two side pipes of the U-shaped main pipeline 15.
In one embodiment, as shown in fig. 1, an internet of things module and a water level gauge are mounted on the thermostat body 10. The Internet of things module comprises a remote monitoring and timing switch. The human power intelligence is realized through the Internet of things module, and the testing personnel can realize the remote operation of the mobile phone. The water level meter is connected to the test containers 4, and mainly tests the water level in each corresponding test container 4.
In a preferred embodiment, as shown in FIG. 1, two rows of test receptacles 4 are provided within the oven body 10. Each row of test containers 4 comprises four to eight test containers, and two ends of the containing area of the incubator main body 10 support a U-shaped main pipeline 15 positioned between the two rows of test containers through a main pipeline lifting frame 8. A branch pipeline 5 and a branch valve 6 are led out from the U-shaped main pipeline 15 corresponding to each test container 4 and are connected to a test container cover on the test container 4, and an exhaust and drainage valve 7 is further arranged on the test container cover. The thermostat body 10 has a temperature controller 1 at the front end, and the temperature controller 1 stores an oil field water outlet container 18 and a test steel sheet (also called test sheet). One end interface of the U-shaped main pipeline is connected with the main air inlet three-way valve 3, and the other end outlet is connected with the main water inlet valve 11. The air inlet or water inlet is controlled by controlling the on-off of the main pipe air inlet three-way valve 3 and the main pipe water inlet valve 11.
On the other hand, the invention also discloses a test method adopting the multifunctional corrosion inhibitor test device. The method adopts the test device and comprises the following steps:
setting a required temperature of the incubator main body 10;
one end of a U-shaped main pipeline 15 is used as a gas input end and is connected with a nitrogen cylinder and a carbon dioxide cylinder through a valve, and the other end of the U-shaped main pipeline is used as a liquid input end;
opening a nitrogen gas port end connected with a nitrogen gas bottle 16, blowing the test container 4 for 2 hours and then closing the test container; opening the valve end of the water inlet valve, and synchronously injecting water into each test container 4; after the water level reaches the required height, closing the inlet valve end;
a test piece is hung in the test container 4, and a valve connected with the end of a carbon dioxide gas bottle 17 is opened to blow carbon dioxide.
In one embodiment, a three-way valve 3 is connected to the main line 15. The three-way valve 3 is respectively connected with a nitrogen cylinder 16, a carbon dioxide cylinder 17 and a main pipeline 15 channel. The middle part of the U-shaped main pipeline 15 is provided with a middle valve 9, and when the middle valve 9 is opened, the test containers on two sides can realize gas injection or water injection.
In a preferred embodiment, the method essentially comprises the steps of:
1) setting required temperature; the temperature setting mainly comprises the temperature setting in the thermostat main body 10 and the temperature setting in the temperature controller 1 for storing oilfield effluent and test steel sheets (also called test sheets);
2) one end of the U-shaped main pipeline 15 is used as a gas input end, and the other end of the U-shaped main pipeline is used as a liquid input end. The two ports are respectively provided with a valve 3 and a valve 11, wherein, the gas input end is provided with a three-way valve which is respectively connected with the interfaces of a nitrogen cylinder 16 and a carbon dioxide cylinder 17, and the third port is connected with a channel of a main pipeline 15;
3) firstly, turning a valve to the nitrogen gas port end, simultaneously, turning a valve handle to the center of the valve after purging a plurality of test containers 4 for 2 hours, and closing the output of nitrogen gas and carbon dioxide;
4) and opening a valve 11 at the other end of the main pipeline 15 of the U-shaped pipe, and synchronously injecting the oilfield produced water into the plurality of test containers 4. After the water level is injected to the required height, the valve 11 is closed;
5) the test piece was hung in the plurality of test containers 4, and the valve 3 was turned to the carbon dioxide end to blow carbon dioxide. Each test container cover is provided with a single exhaust valve 7 which plays a role in isolating air;
6) the thermostat 1 (i.e. the temperature controller) was started to run for a 24h test period. Meanwhile, an artificial intelligence device is added to the testing device. The device realizes the long-time separation of man and machine by installing the combination of the Internet of things module, the water level meter (or the water level measuring device) and the electromagnetic valve. In addition, the automatic regulation and control heat-conducting medium is arranged at the lowest position or the highest position of the incubator main body 10, and the instrument and equipment cannot be damaged due to volatilization or overflow of the heat-conducting medium.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, the appended claims are intended to be construed to include preferred embodiments and all such changes and/or modifications as fall within the scope of the invention, and all such changes and/or modifications as are made to the embodiments of the present invention are intended to be covered by the scope of the invention.
Claims (10)
1. A multifunctional corrosion inhibitor test device is characterized by comprising:
a incubator main body in which a plurality of test containers can be accommodated;
the main pipeline is connected to the thermostat main body and is provided with a port for connecting an air source and a water source;
the valves and branch pipelines are connected between the main pipeline and each test container to realize the connection and control of each test container.
2. The test device according to claim 1, wherein the main pipeline is a U-shaped main pipeline, one end of the U-shaped main pipeline is provided with an air inlet and main pipe interface and an air inlet main pipe valve, and the other end of the U-shaped main pipeline is provided with a main pipe water inlet valve.
3. The testing device according to claim 2, wherein the thermostat box body is provided with a water pump switch and a water inlet interface, and the water pump switch and the water inlet interface are arranged at one end of the thermostat box body and close to one side of a main pipe water inlet valve on the U-shaped main pipe; the water inlet interface is arranged at the lower side of the thermostat main body and is connected to a main pipe water inlet valve on the main pipeline through a connecting pipe.
4. The testing device of claim 3, wherein the thermostat body is further provided with a temperature controller and a main power switch, the temperature controller is arranged on the thermostat body and is provided with a temperature controller display screen on one side of the thermostat body, and the main power switch is arranged on the same side of the thermostat body.
5. The test device according to any one of claims 2 to 4, wherein a main line crane is provided at both ends of the U-shaped main line.
6. The test device according to any one of claims 1 to 4, wherein the test container is provided with a test container cover, the test container cover is further provided with a one-way exhaust and drainage valve for connecting an external exhaust system and a drainage system, and the exhaust and drainage valve isolates the inside of the test container from external air.
7. The test device according to claim 6, wherein the U-shaped main pipeline is provided with a middle valve at the joint of the two end pipes to separate the two side pipelines of the main pipeline.
8. The testing device of claim 7, wherein the incubator body is provided with an Internet of things module and a water level measuring device, the Internet of things module comprises a remote monitoring and timing switch, and the water level measuring device is connected with the testing container.
9. A test method using a multifunctional corrosion inhibitor test apparatus, characterized in that it uses a test apparatus according to any one of claims 1 to 8, and comprises the steps of:
setting the required temperature of the thermostat main body;
one end of a U-shaped main pipeline of the main pipeline is used as a gas input end and is connected with a nitrogen cylinder and a carbon dioxide cylinder through a valve, and the other end of the U-shaped main pipeline is used as a liquid input end;
opening a nitrogen gas port end connected with a nitrogen gas bottle, blowing the test container for 2 hours, and then closing the test container; opening the valve end of the water inlet valve, and synchronously injecting water into each test container; after the water level reaches the required height, closing the inlet valve end;
and hanging a test piece into the test container, and opening a valve connected with the end of the carbon dioxide gas cylinder to blow carbon dioxide.
10. The testing method according to claim 9, wherein the main pipeline is connected with a three-way valve which is respectively connected with a nitrogen cylinder, a carbon dioxide cylinder and a main pipeline channel; the middle part of the U-shaped main pipeline is provided with a middle valve, and when the middle valve is opened, the test containers on two sides can realize gas injection or water injection.
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