CN112213256A - Testing arrangement of bacterium to steel corrosion influence under oil gas pipeline cathodic polarization - Google Patents
Testing arrangement of bacterium to steel corrosion influence under oil gas pipeline cathodic polarization Download PDFInfo
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- CN112213256A CN112213256A CN202011071454.XA CN202011071454A CN112213256A CN 112213256 A CN112213256 A CN 112213256A CN 202011071454 A CN202011071454 A CN 202011071454A CN 112213256 A CN112213256 A CN 112213256A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
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Abstract
The invention discloses a device for testing the corrosion influence of bacteria on steel under the cathodic polarization of an oil-gas pipeline, which comprises 3 parts of a reaction container assembly, an electrochemical testing assembly and a magnetic stirrer assembly. The reaction container assembly comprises a reaction container which is nested in a heat-insulating barrel; the reaction container is sealed by a sealing cover; the air inlet and the air outlet are fixed on the sealing cover; the pressure sensor and the temperature monitor are fixed on the sealing cover; the sealing cover is provided with two openings, so that solution can be sucked and injected into the reaction vessel, and the probe of the multifunctional tester can be fixed in the reaction vessel. The electrochemical testing assembly comprises two electrochemical working stations, one station provides a cathodic protection environment, and the other station carries out electrochemical testing; all the electrodes are connected with the sealing cover through copper wires; the magnetic stirrer is arranged at the bottom of the reaction vessel component, and the rotor is connected with the bottom of the reaction vessel through a screw. The device can test the influence of the polarization effect on bacterial corrosion under the actual flow condition on the pipeline site.
Description
Technical Field
The invention relates to the field of electrochemical testing technology and bacterial corrosion, in particular to a testing device for testing the influence of bacteria on steel corrosion under the cathodic polarization of an oil-gas pipeline.
Background
Petroleum and natural gas are important energy sources widely used in various fields in China, and the importance of oil and gas resources becomes more and more important with the continuous development of economy in China. Pipelines, the most common means of transport for oil and gas, often face serious corrosion problems. If the pipeline corrodes, cause pipeline wall thickness attenuate easily, produce the crack, can lead to the oil gas to reveal when serious, cause the pollution to the surrounding environment, cause the threat to personal safety. Cathodic protection is the most common pipeline protection measure and is widely applied to the current oil and gas pipeline protection work. Common cathodic protection methods are an impressed current method and a sacrificial anode method, wherein the impressed current method needs to connect an anode with an impressed direct current voltage with a protected pipeline metal cathode to provide continuous protection current, and a certain potential difference is formed between the impressed current method and the protected pipeline metal cathode to play a role in protecting the pipeline.
Bacterial corrosion is one of the most common corrosion conditions, and can affect bacteria in an oil and gas pipeline under the environment of applying current protection, inhibit bacterial corrosion and accelerate bacterial corrosion. There have been many studies on the effect of bacteria on corrosion of steel under cathodic protection. However, the testing device and method for simulating the influence of polarization on bacterial corrosion in the pipe conveying environment are not perfect.
The testing device provides high-temperature and high-pressure conditions, a flowing environment and a real-time online monitoring function, can simulate the influence of the polarization effect on bacterial corrosion under the actual pipeline flowing condition on the site, and has the characteristics of high operability and reliability.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects in the prior art, the invention aims to provide a device for testing the corrosion influence of bacteria on steel under the cathodic polarization of an oil-gas pipeline.
The technical scheme is as follows: the device consists of 3 parts, namely a reaction container assembly, an electrochemical testing assembly and a magnetic stirrer assembly; the reaction vessel assembly provides a simulation and test space, and the reaction vessel 6 is nested in the heat-insulating barrel 5; the sealing cover 8 is nested with the reaction vessel 6 and is connected with the heat-insulating barrel 5 through a big screw 17; the air inlet 10 and the air outlet 16 are fixed on the sealing cover 8 and can be connected with an external air bottle through threads; the pressure sensor 11 is fixed on the sealing cover 8, can monitor the pressure change in the reaction vessel in real time, and send the information to the computer 13; the temperature monitor 12 can not only control the heating wire 7 on the reaction vessel 6 to heat, but also monitor the temperature change in the reaction vessel 6 and send the information to the computer 13; the upper opening 1-9 of the sealing cover 8 can suck and inject solution into the reaction vessel, and the opening 2-15 can fix the probe of the multifunctional tester 24 in the reaction vessel 6; the multifunctional tester probe 24 is connected with the multifunctional tester 23 through an electric wire;
the electrochemical testing assembly provides cathodic protection and carries out electrochemical testing, the electrochemical work stations 1-14 and the electrochemical work stations 2-25 are simultaneously connected with the auxiliary electrode 22 and the reference electrode 18, the electrochemical work stations 2-25 are simultaneously connected with the work electrodes 1-19, the work electrodes 2-20 and the work electrodes 3-21, and the electrochemical work stations 1-14 are only connected with the work electrodes 3-21; all electrodes are fixed on the sealing cover 8; the test results of the electrochemical workstations 1-14 and the electrochemical workstations 2-25 can be transmitted to the computer 13;
the magnetic stirring assembly provides a simulated flowing environment and comprises a magnetic stirrer tray 3, a magnetic stirrer base 1 and a reaction container assembly, wherein the magnetic stirrer tray 3 is positioned on the magnetic stirrer base 1 and is jointly arranged at the bottom of the reaction container assembly; the rotor 4 is connected with the bottom of the reaction vessel 6 through a small screw 2, the movement range and the track of the rotor 4 are fixed, and the rotating knob 22 can be rotated to adjust the rotating speed of the rotor 4.
Furthermore, the rotor 4 is connected with the bottom of the reaction vessel 6 through the small screw 2, so that the rotation track of the rotor 4 can be fixed, and other devices in the reaction vessel 6 are not influenced.
Further, the electrochemical stations 1-14 and the electrochemical stations 2-25 may be operated individually or simultaneously.
Further, the multifunctional tester probe 23 can measure the pH, dissolved oxygen content and ion content of the solution at the same time.
Further, the temperature, pressure, electrochemical test results, solution pH, ion amount and dissolved oxygen content in the reaction vessel 6 can be monitored in real time and transmitted to the computer 13.
Further, openings 1 to 9 are provided from the sealing cap 8 to suck and inject the solution from the reaction vessel at any time.
Drawings
FIG. 1 is a schematic structural diagram of a testing device for testing the corrosion effect of bacteria on steel under cathodic polarization of an oil and gas pipeline, which shows the connection condition of various devices in the device;
FIG. 2 is a top view of the reactor assembly of the testing apparatus for the corrosion effect of bacteria on steel under cathodic polarization of an oil and gas pipeline, showing the spatial positions of the devices in the sealing cover.
FIG. 3 is a test result diagram of the test device for testing the corrosion effect of bacteria on steel under the cathodic polarization of the oil and gas pipeline, which is an impedance diagram of a blank group of working electrodes 3-21.
FIG. 4 is a test result diagram of the test device for testing the corrosion influence of bacteria on steel under the cathodic polarization of the oil and gas pipeline, which is an impedance diagram of working electrodes 3-21 under the cathodic polarization potential of-0.85 v.
Detailed description of the invention
The technical solution is described in detail below with reference to the accompanying drawings by means of a preferred embodiment.
Fixing an auxiliary electrode 22, a reference electrode 18, working electrodes 1-19, working electrodes 2-20 and working electrodes 3-21 in a sealing cover 8 by using copper wires, wherein the cross sections of the working electrodes 3-21 need to face the top end of the reference electrode 18; inserting the multifunctional tester probe 24 into the openings 2-15, and sealing and fixing; the openings 1-9, the air inlet 10 and the air outlet 16 in the sealing cover 8 are checked to be closed, and the pressure sensor 11 and the temperature monitor 12 are checked to be free of looseness; the prepared and sterilized bacterial culture medium is filled into the reaction vessel 6, the sealing cover 8 is arranged, the big screw 17 is screwed, and the reaction vessel 6 is sealed.
In this case, the bacteria are SRB anaerobes, and thus it is necessary to perform an oxygen removal operation. Connecting a nitrogen gas bottle with the gas inlet 10, opening the gas outlet 16, opening a gas bottle valve, opening the gas inlet 10, and deoxidizing the culture medium.
After deoxygenation is completed, injecting bacteria with the same quantity in the simulated environment from the opening 1-9, and then closing the sealed opening 1-9, wherein the nitrogen gas tank is not detached in the process;
closing the air outlet 16, starting to suppress pressure, closing the air inlet 10 after the pressure in the pipeline in the simulated environment is reached, closing a valve of the nitrogen tank, and dismantling the nitrogen tank;
setting the temperature in the reaction vessel from the computer 13 to the temperature in the pipe in the simulated environment;
turning on the magnetic stirrer assembly, and rotating the knob 22 to adjust the rotation speed to the flow speed in the pipeline under the simulated environment;
opening the electrochemical workstation 1-14, measuring the impedance of the working electrode 3-21, opening the electrochemical workstation 2-25 to simultaneously apply a cathode polarization potential of-0.85 v to the working electrode 1-19, the working electrode 2-20 and the working electrode 3-21, and providing a cathode protection environment;
opening the multifunctional tester 23, the pressure sensor 11 and the temperature monitor 12 to monitor the changes of the pH value, the pressure and the temperature in the reaction vessel in real time;
in the simulation process, extracting the solution in the reaction container 6 every day, measuring the bacterial metabolites and judging the growth condition of the bacteria;
and after the simulation is finished, the device is disassembled. Opening the air outlet 16 for pressure relief; extracting the final solution and measuring the bacterial content; and taking out the working electrodes 1-19, the working electrodes 2-20 and the working electrodes 3-21, wherein the working electrodes 1-19 are used for detecting the accumulation condition of corrosion products, the working electrodes 2-20 are used for detecting corrosion morphology, and the working electrodes 3-21 are used for judging the corrosion trend of the steel in the environment.
Establishing a blank group of experiments, wherein the blank group of experiments are consistent with the above steps, but the electrochemical workstation 2-25 is not used, and the cathodic protection potential is not applied;
by comparing the corrosion conditions of the blank group and the experimental group, the influence of bacteria on the corrosion condition of the steel in the cathode polarization environment can be obtained.
As shown in FIGS. 3 and 4, the impedance of the working electrodes 3-21 increased with time under the blank condition, and although the impedance of the working electrodes 3-21 also increased with time under the cathodic polarization condition of-0.85 v, the magnitude of the increase was smaller than that of the blank group, and the degree of bacterial corrosion was greater than that of the blank group. Therefore, a cathodic polarization potential of-0.85V promotes growth and metabolism of SRB, and the actively metabolized SRB has increased metal corrosion attack.
The invention can simulate the influence of bacteria on steel corrosion of the pipeline under cathodic polarization. The foregoing is only a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (6)
1. The utility model provides a testing arrangement of bacterium to steel corrosion influence under oil gas pipeline cathodic polarization which characterized in that includes:
3 sections of a reaction vessel assembly, an electrochemical test assembly and a magnetic stirrer assembly;
the reaction vessel component comprises a reaction vessel (6) which is nested in a heat-preserving barrel (5); the sealing cover (8) is nested with the reaction container (6) and is connected with the heat-insulating barrel (5) through a big screw (17); the air inlet (10) and the air outlet (16) are fixed on the sealing cover (8) and can be connected with an external air bottle through threads; the pressure sensor (11) is fixed on the sealing cover (8), can monitor the pressure change in the reaction vessel (6) in real time and send the information to the computer (13); the temperature monitor (12) can not only control the heating wire (7) on the reaction vessel (6) to heat, but also monitor the temperature change in the reaction vessel (6) and send the information to the computer (13); the sealing cover (8) is provided with an opening 1(9) and an opening 2(15), can be opened and closed at any time, can suck and inject the solution into the reaction vessel (6) through the opening 1(9), and can fix the multifunctional tester probe (24) in the reaction vessel (6) through the opening 2 (15); the multifunctional tester probe (24) is connected with the multifunctional tester (23) through an electric wire;
the electrochemical testing assembly comprises an electrochemical workstation 1(14) and an electrochemical workstation 2(25), and is simultaneously connected with an auxiliary electrode (22) and a reference electrode (18). The electrochemical workstation 2(25) is connected with the working electrode 1(19), the working electrode 2(20) and the working electrode 3(21) at the same time, and the electrochemical workstation 1(14) is connected with the working electrode 3(21) only; the auxiliary electrode (22), the reference electrode (18), the working electrode 1(19), the working electrode 2(20) and the working electrode 3(21) are fixed on the sealing cover (8); the test results of the electrochemical work stations 1(14) and 2(25) can be transmitted to the computer (13);
the magnetic stirrer component comprises a magnetic stirrer tray (3) which is positioned on a magnetic stirrer base (1) and is jointly arranged at the bottom of the reaction container component, a rotor (4) is connected with the bottom of the reaction container (6) through a small screw (2), and the rotating speed of the rotor (4) can be adjusted through a rotatable knob (22).
2. The device for testing the corrosion influence of the bacteria on the steel under the cathodic polarization of the oil and gas pipeline according to claim 1, wherein the rotor (4) is connected with the bottom of the reaction vessel (6) through the small screw (2), the rotating track of the rotor (4) can be fixed, other devices in the reaction vessel (6) are not influenced, and the rotor (4) can be detached, so that the replacement and the cleaning are convenient.
3. The device for testing the corrosion influence of bacteria on steel under the cathodic polarization of an oil and gas pipeline according to claim 1, wherein the electrochemical workstation 1(14) and the electrochemical workstation 2(25) can be independently operated for electrochemical testing. And the electrochemical working station 2(25) can work simultaneously to carry out cathodic protection on the working electrode 1(19), the working electrode 2(20) and the working electrode 3(21), and the electrochemical working station 1(14) carries out electrochemical test on the working electrode (21).
4. The device for testing the corrosion influence of bacteria on steel under the cathodic polarization of an oil and gas pipeline according to claim 1, wherein the multifunctional tester probe (23) can simultaneously measure the pH value, the dissolved oxygen content and the ion content of the solution.
5. The device for testing the corrosion effect of bacteria on steel under the cathodic polarization of an oil and gas pipeline according to claim 1, characterized in that all test data are monitored in real time, and the temperature, pressure, electrochemical test results, pH, ion amount and dissolved oxygen content in the reaction vessel (6) can be transmitted to the computer (13).
6. The device for testing the corrosion influence of the bacteria on the steel under the cathodic polarization of the oil and gas pipeline according to claim 1, wherein the opening 1(9) is arranged on the sealing cover (8), so that the solution is sucked and injected from the reaction container (6) at any time, the content of the bacteria in the solution is monitored, and the growth condition of each stage of the bacteria is judged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011071454.XA CN112213256B (en) | 2020-10-09 | 2020-10-09 | Testing arrangement of bacterium to steel corrosion influence under oil gas pipeline cathodic polarization |
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| CN202011071454.XA CN112213256B (en) | 2020-10-09 | 2020-10-09 | Testing arrangement of bacterium to steel corrosion influence under oil gas pipeline cathodic polarization |
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| CN112213256A true CN112213256A (en) | 2021-01-12 |
| CN112213256B CN112213256B (en) | 2021-10-08 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105866018A (en) * | 2016-04-19 | 2016-08-17 | 中国石油天然气集团公司 | Test device and method for evaluating scouring corrosion of oil-gas pipeline under high flow rate |
| CN107727564A (en) * | 2017-10-24 | 2018-02-23 | 天津大学 | The electrochemical testing device of metal microbiologic(al) corrosion under current system |
| CN108680491A (en) * | 2016-05-16 | 2018-10-19 | 天津大学 | Method for testing using dynamic electrochemical device |
| CN109507263A (en) * | 2018-11-06 | 2019-03-22 | 国网江西省电力有限公司电力科学研究院 | Corrosion test system of the microorganism to earthed-metal material |
| CN111458286A (en) * | 2020-05-26 | 2020-07-28 | 西安文理学院 | Oil field SRB bacterial growth characteristic and corrosion simulation device and test method |
| CN111470580A (en) * | 2020-04-07 | 2020-07-31 | 天津大学 | Electrochemical reaction system capable of exploring corrosion of tap water pipe wall and microbial growth |
| CN211206194U (en) * | 2019-12-17 | 2020-08-07 | 西南石油大学 | Corrosion loop experiment device for seawater dry-wet alternative environment |
-
2020
- 2020-10-09 CN CN202011071454.XA patent/CN112213256B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105866018A (en) * | 2016-04-19 | 2016-08-17 | 中国石油天然气集团公司 | Test device and method for evaluating scouring corrosion of oil-gas pipeline under high flow rate |
| CN108680491A (en) * | 2016-05-16 | 2018-10-19 | 天津大学 | Method for testing using dynamic electrochemical device |
| CN107727564A (en) * | 2017-10-24 | 2018-02-23 | 天津大学 | The electrochemical testing device of metal microbiologic(al) corrosion under current system |
| CN109507263A (en) * | 2018-11-06 | 2019-03-22 | 国网江西省电力有限公司电力科学研究院 | Corrosion test system of the microorganism to earthed-metal material |
| CN211206194U (en) * | 2019-12-17 | 2020-08-07 | 西南石油大学 | Corrosion loop experiment device for seawater dry-wet alternative environment |
| CN111470580A (en) * | 2020-04-07 | 2020-07-31 | 天津大学 | Electrochemical reaction system capable of exploring corrosion of tap water pipe wall and microbial growth |
| CN111458286A (en) * | 2020-05-26 | 2020-07-28 | 西安文理学院 | Oil field SRB bacterial growth characteristic and corrosion simulation device and test method |
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