CN102854127A - Contrast simulation testing device for carbon dioxide corrosion resistant performance of steel and testing method thereof - Google Patents
Contrast simulation testing device for carbon dioxide corrosion resistant performance of steel and testing method thereof Download PDFInfo
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- CN102854127A CN102854127A CN2012103487316A CN201210348731A CN102854127A CN 102854127 A CN102854127 A CN 102854127A CN 2012103487316 A CN2012103487316 A CN 2012103487316A CN 201210348731 A CN201210348731 A CN 201210348731A CN 102854127 A CN102854127 A CN 102854127A
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Abstract
The invention discloses a contrast simulation testing device for carbon dioxide corrosion resistant performance of steel and a testing method thereof. The device comprises a reaction kettle, a solution pond and a pressure adjusting device, wherein the solution tank is connected with the reaction kettle by a liquid control valve; a heating rod and a heat insulation material are wound on the outer wall of the reaction kettle; a thermal couple and a temperature adjuster are arranged in the reaction kettle; a sample clamp connected with a stirring device is arranged in the reaction kettle; and a pressure adjusting device comprises a CO2 gas tank and an N2 gas tank which are connected with the bottom of the reaction kettle. The method is used for contrasting and simulating a condition that a pipeline steel material is corroded by CO2 in crude oil so as to evaluate corrosion velocity of the steel material of which the temperature is between 90 and 120 DEG C, CO2 partial pressure is between 1 and 2.4MPa in the solution. The CO2 corrosion resistant performance of the steel with different materials, steel levels and thicknesses can be tested at the same time, and the test is convenient and easy. Corrosion simulation test of various oil fields is performed by adjusting the temperature, partial pressure and solution components.
Description
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Technical field
The present invention relates to the material corrosion field, specifically the anti-CO of a kind of steel
2Comparative simulation proving installation and the method for testing thereof of corrosive nature.
Background technology
In recent years, domestic and international Efforts To Develop CO
2The displacement of reservoir oil improves research and development and the application of recovery efficiency technique.CO
2The displacement of reservoir oil has the advantages such as the scope of application is large, displacement of reservoir oil cost is low, enhanced oil recovery is remarkable.But CO
2Corrosion is one of the development of puzzlement China oil and gas industry very distinct issues.
CO in the crude oil pipeline
2Corrode the CO in the High Temperature High Pressure Multiphase Flow medium specifically
2Corrosion, influence factor is more, general corrosion that not only can occurrence of large-area, and tend to occur the local corrosions such as point-like, tableland shape, vortex shape, cellular and flask shape, harm is large and the prediction difficulty is larger.
Corrosion rate is anti-CO
2Corrosion steel most important technical indicator, according to corrosion rate not only can objective science ground evaluating material CO
2Corrosive nature, and can under conditions of similarity, predict out-of-service time of steel.The related data of the decay resistance of existing measurement steel has:
The patent No. is CN2491826, and a kind of period soaking corrosion test box can be realized the corrosion simulation condition of alternation of wetting and drying and illumination.By making sample immerse or break away from the acid etching solution impregnation groove property performance period infiltration of below; Dry by far-infrared lamp irradiation specimen surface illumination simulation.But this equipment can't accurately be controlled temperature without cooling device.
Application number is 20070016705.2, and a kind of dynamic simulation tester in erosion chamber can be realized the corrosion test of two flow velocitys and the state of the flow state of online observation corrosive medium and corrosion coupon simultaneously.Main composition is piping system, temperature control system, detection system, the circulation system etc.
Application number is 02283947.X, a kind of human body water ﹠ fat measuring meter, can be in etching system lacing film, the flow state of simulation oil field gathering system oil, gas, water three-phase medium.Main composition is commingled system, piece-rate system, etching system etc.But without design parameter.
The patent No. is CN102305761, and the corrosion simulated test unit of acid medium conveyance conduit weld seam and mother metal and method can be simulated under the pipeline transport condition in the peracidity rock gas acid medium to the corrosion condition of pipe welding seam and mother metal.Main composition is stocking system, temperature control system, pressure system, piece-rate system etc.Test findings is true, but scale is large, expense is high.
Above-mentioned patent all is method and the device relevant with corrosion test, but or the functional purpose difference, perhaps without detailed test method and means, perhaps expense is high inconvenient.Be not applicable to the anti-CO of use for laboratory Crude Oil Transportation steel
2Comparative simulation method of testing and the device of corrosive nature.
Summary of the invention
The purpose of this invention is to provide the anti-CO of a kind of steel
2Comparative simulation proving installation and the method for testing thereof of corrosive nature, this apparatus structure is simple, stable performance, control accuracy are high, simple to operate, can be used in the laboratory the anti-CO to steel
2The comparative simulation test of corrosive nature.Test and method can provide different temperatures, CO
2Dividing potential drop and solution composition, CO in the crude oil under the comparative simulation different condition
2Corrosion condition to pipeline; And can satisfy simultaneously the steel contrast corrosion test of unlike material, grade of steel and wall thickness.
The objective of the invention is to be achieved through the following technical solutions:
The anti-CO of a kind of steel
2The comparative simulation proving installation of corrosive nature, it is characterized in that: this device comprises reactor, solution pool and pressure adjustment assembly, the outlet of solution pool is connected with the upper end of reactor by liquid control valve, and the import of solution pool is connected with the lower end of reactor with fluid pressure pump by liquid control valve; Be arranged with heating rod in reactor outer wall pressed on ring, be provided with heat-barrier material in the heating rod outside, be provided with to measure the thermopair of solution temperature in the reactor in reactor, thermopair is connected with temperature regulator; Be provided with sample clamp in reactor, sample clamp is connected with the stirring apparatus that reaches the reactor outside; Described pressure adjustment assembly comprises CO
2Gas tank and N
2Gas tank, CO
2Gas tank and N
2Gas tank all is connected with the bottom of reactor with gas pressure pump by gas control valve; At CO
2Gas tank and N
2Be equipped with gas gauge and one-way cock between gas tank and reactor; Be provided with gas outlet in the reactor upper end.
Among the present invention, the temperature regulating range of temperature regulator is 30 ℃ ~ 150 ℃.Be provided with tensimeter in the reactor upper end.Be provided with one group of sample inlaying device at sample clamp.
The anti-CO of a kind of steel
2The method of testing of the comparative simulation proving installation of corrosive nature is characterized in that the method may further comprise the steps:
(1) steel are processed into arc sample, through after the sand papering, it are immersed in the beaker that fills acetone, put into ultrasonic washing instrument and clean, remove the greasy dirt of specimen surface, alcohol wash cold wind dries up; Steel can be processed into the arc sample of φ 87mm, through the 800# sand papering, put into ultrasonic washing instrument and cleaned 20 minutes.
(2) arc sample is carried out the DATA REASONING record, then arc sample is mounted on the sample clamp of proving installation, put into reactor; Sample can be placed on the electronic analytical balance weigh of precision 0.1mg, with the vernier caliper measurement size of precision 0.02mm, and the area of calculating sample erosional surface, the data that record is measured.
(3) with experimental solutions CO
2Pass in solution pool and the reactor after the deoxygenation; Cl in the solution composition
-Concentration 600 ~ 15000lmg/L;
(4) by heating rod reaction solution is heated, and by solution temperature in the thermopair Real-Time Monitoring reactor, the serviceability temperature regulator is regulated temperature; Temperature regulating range is 30 ℃ ~ 150 ℃;
(5) open and CO
2Gas tank and N
2The tank connected operation valve of gas, and the CO that keeps experiment to need by forcing pump
2Dividing potential drop; CO
2The dividing potential drop range of adjustment is 0.6MPa ~ 2.5Mpa;
(6) open liquid control valve, forcing pump between solution pool and the reactor, keep certain flow velocity that reaction solution is flowed between reactor and solution pool;
(7) drive the sample clamp rotation by stirring apparatus, homogeneous reaction still internal corrosion atmosphere, keep above-mentioned reactiveness 7-8 days after, take out the sample that is corroded, decontamination, take pictures, remove corrosion products film after drying up, weigh, obtain test result.
The present invention has following advantage:
(1) provides CO in the Simulation of Crude Oil
2The corrosion condition of steel under the etching condition is for the fundamental research of the aspects such as corrosion of steel rule, corrosion mechanism provides means.
(2) can provide different temperatures, CO
2Dividing potential drop and solution composition, CO in the crude oil under the comparative simulation different condition
2Corrosion condition to pipeline.
(3) sample is prepared into the actual conditions that arc meets the pipeline steel, and can satisfy simultaneously the steel contrast corrosion test of unlike material, grade of steel and wall thickness.
(4) simple in structure, the stable performance of experimental provision, control accuracy are high, simple to operate, can be used in the laboratory the anti-CO to steel
2The comparative simulation test of corrosive nature.
Description of drawings
Fig. 1 is apparatus structure schematic diagram of the present invention.
Fig. 2 is the sample machining sketch chart.
Embodiment
Below the present invention will be described in more detail with concrete case study on implementation, and following case study on implementation only is the description to best mode for carrying out the invention, scope of the present invention is not limited to some extent.
The anti-CO of a kind of steel
2The comparative simulation proving installation of corrosive nature, see Fig. 1, this device comprises reactor 1, solution pool 2 and pressure adjustment assembly 3, the outlet of solution pool 2 is connected with the upper end of reactor 1 by liquid control valve 21, and the import of solution pool 2 is passed through liquid control valve 21 and is connected with fluid pressure pump and is connected with the lower end of reactor 1; Be arranged with heating rod 11 in reactor 1 outer wall pressed on ring, be provided with heat-barrier material 12 in heating rod 11 outsides, be provided with to measure the thermopair 13 of solution temperature in the reactor in reactor 1, thermopair 13 is connected with temperature regulator 14; The temperature regulating range of temperature regulator is 30 ℃ ~ 150 ℃.In reactor 1, be provided with sample clamp 15, be provided with one group of sample inlaying device at sample clamp.Sample clamp 15 is connected with the stirring apparatus 16 that reaches the reactor outside; Pressure adjustment assembly 3 comprises CO
2Gas tank 31 and N
2Gas tank 32, CO
2Gas tank and N
2Gas tank all is connected with gas pressure pump by gas control valve 33 and is connected with the bottom of reactor; At CO
2Gas tank and N
2Be equipped with gas gauge 35 and one-way cock 36 between gas tank and reactor; Be provided with gas outlet 17 in the reactor upper end.Be provided with tensimeter 18 in the reactor upper end.Connect by pipeline 4 between this device each several part.
The composition of experimental solutions sees Table 1, in order to simulated oil gas field corrosive medium environment.
Four kinds of oil gas field Produced Liquid simulations of table 1 composition (unit: mg/L)
| Solution | Cl - | SO 4 2- | HCO 3 - | Mg 2+ | Ca 2+ | Na + |
| Composition | 6000 | 5450 | 600 | 1050 | 880 | 2300 |
Temperature: 90 ℃
CO
2Dividing potential drop: 1 MPa
Experiment material: Q235B, L415,304,316L
Concrete operations are as follows:
(1) steel are processed into the arc sample of φ 87mm, after the 800# sand papering, it are immersed in the beaker that fills acetone, put into ultrasonic washing instrument and cleaned 20 minutes, remove the greasy dirt of specimen surface, alcohol wash cold wind dries up;
(2) sample is placed on the electronic analytical balance weigh of precision 0.1mg, with the vernier caliper measurement size of precision 0.02mm, and calculates the area of sample erosional surface, the data that record is measured; Every group of experiment inlayed a plurality of arc samples to sample clamp, puts into reactor;
(3) the proportioning test solution A is used CO
2Pass into behind the deoxygenation 10h in solution pool and the reactor;
(4) by heating rod solution is heated, and by solution temperature in the thermopair Real-Time Monitoring reactor, the serviceability temperature regulator keeps after regulating temperature to 90 ℃; Open liquid control valve, forcing pump between solution pool and the reactor, keep certain flow velocity that reaction solution is flowed between reactor and solution pool;
(5) open and CO
2Gas tank and N
2The tank connected operation valve of gas, and the CO that keeps experiment to need by forcing pump
2Dividing potential drop, CO
2Dividing potential drop is 1 MPa;
(6) open liquid control valve, forcing pump between solution pool and the reactor, keep certain flow velocity that reaction solution is flowed between reactor and solution pool;
(7) drive the sample clamp rotation by stirring apparatus in the experimentation, homogeneous reaction still internal corrosion atmosphere is tested and is taken out sample after 7 days, dries up through the flushing of clear water alcohol and takes pictures; Then sample is put into rust removing solution, cleaning-drying behind the removal corrosion products film, service precision is that the electronic analytical balance of 0.1mg is weighed, and obtains test result.
The corrosion rate (mm/a) of experiment steel grade is respectively Q235B, 2.99; L415,3.88; 304,0.014; 316L, 0.005.
Temperature: 120 ℃
CO
2Dividing potential drop: 2.4 MPa
Experiment material: Q235B, L415,304,316L
Concrete operations are except solution, temperature, CO
2Dividing potential drop is different, and other processes are with embodiment 1:
The corrosion rate (mm/a) of experiment steel grade is respectively Q235B, 2.05; L415,1.85; 304,0.007; 316L, 0.003.
The corrosion rate of embodiment 1 order from high to low is followed successively by L415＞Q235B＞304 stainless steels＞316L stainless steel;
The corrosion rate of embodiment 2 order from high to low is followed successively by Q235B＞L415＞304 stainless steels＞316L stainless steel;
Experimental provision of the present invention is simple in structure, stable performance, control accuracy are high, simple to operate, can be used in the laboratory the anti-CO to steel
2The comparative simulation test of corrosive nature.CO in the Simulation of Crude Oil is provided
2The corrosion condition of steel under the etching condition is for the fundamental research of the aspects such as corrosion of steel rule, corrosion mechanism provides means.Different temperatures, CO can be provided
2Dividing potential drop and solution composition, CO in the crude oil under the comparative simulation different condition
2Corrosion condition to pipeline.Sample is prepared into the actual conditions that arc meets the pipeline steel, and can satisfy simultaneously the steel contrast corrosion test of unlike material, grade of steel and wall thickness.
Claims (8)
1. anti-CO of steel
2The comparative simulation proving installation of corrosive nature, it is characterized in that: this device comprises reactor (1), solution pool (2) and pressure adjustment assembly (3), the outlet of solution pool (2) is connected with the upper end of reactor (1) by liquid control valve (21), and the import of solution pool (2) is connected 22 by liquid control valve (21) with fluid pressure pump) be connected with the lower end of reactor (1); Be arranged with heating rod (11) in reactor (1) outer wall pressed on ring, be provided with heat-barrier material (12) in heating rod (11) outside, be provided with to measure the thermopair (13) of solution temperature in the reactor in reactor (1), thermopair (13) is connected with temperature regulator (14); Be provided with sample clamp (15) in reactor (1), sample clamp (15) stirring apparatus (16) outside with reaching reactor (1) is connected; Described pressure adjustment assembly (3) comprises CO
2Gas tank (31) and N
2Gas tank (32), CO
2Gas tank (31) and N
2Gas tank (32) all is connected 34 by gas control valve (33) with gas pressure pump) be connected with the bottom of reactor (1); At CO
2Gas tank (31) and N
2Be equipped with gas gauge (35) and one-way cock (36) between gas tank (32) and reactor (1); Be provided with gas outlet (17) in reactor (1) upper end.
2. the anti-CO of steel according to claim 1
2The comparative simulation proving installation of corrosive nature is characterized in that: the temperature regulating range of temperature regulator (14) is 30 ℃ ~ 150 ℃.
3. the anti-CO of steel according to claim 1
2The comparative simulation proving installation of corrosive nature is characterized in that: be provided with tensimeter (18) in reactor (1) upper end.
4. the anti-CO of steel according to claim 1
2The comparative simulation proving installation of corrosive nature is characterized in that: be provided with one group of sample inlaying device at sample clamp (15).
5. anti-CO of the described steel of claim 1
2The method of testing of the comparative simulation proving installation of corrosive nature is characterized in that the method may further comprise the steps:
(1) steel are processed into arc sample, through after the sand papering, it are immersed in the beaker that fills acetone, put into ultrasonic washing instrument and clean, remove the greasy dirt of specimen surface, alcohol wash cold wind dries up;
(2) arc sample is carried out the DATA REASONING record, then arc sample is mounted on the sample clamp of proving installation, put into reactor;
(3) with experimental solutions CO
2Pass in solution pool and the reactor after the deoxygenation;
(4) by heating rod reaction solution is heated, and by solution temperature in the thermopair Real-Time Monitoring reactor, the serviceability temperature regulator is regulated temperature;
(5) open and CO
2Gas tank and N
2The tank connected operation valve of gas, and the CO that keeps experiment to need by forcing pump
2Dividing potential drop;
(6) open liquid control valve, forcing pump between solution pool and the reactor, keep certain flow velocity that reaction solution is flowed between reactor and solution pool;
(7) drive the sample clamp rotation by stirring apparatus, homogeneous reaction still internal corrosion atmosphere, keep above-mentioned reactiveness 7-8 days after, take out the sample that is corroded, decontamination, take pictures, remove corrosion products film after drying up, weigh, obtain test result.
6. method of testing according to claim 5 is characterized in that: Cl in the solution composition
-Concentration 600 ~ 15000lmg/L.
7. method of testing according to claim 5, it is characterized in that: temperature regulating range is 30 ℃ ~ 150 ℃.
8. method of testing according to claim 5 is characterized in that: CO
2The dividing potential drop range of adjustment is 0.6MPa ~ 2.5MPa.
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| CN103940818B (en) * | 2014-02-25 | 2016-07-13 | 中国石油大学(华东) | Supercritical CO2Stability of emulsion evaluating apparatus and method |
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| CN109580467A (en) * | 2018-12-17 | 2019-04-05 | 中国神华能源股份有限公司 | A kind of test equipment and test method of resistant material corrosion life |
| CN109580467B (en) * | 2018-12-17 | 2023-09-22 | 中国神华能源股份有限公司 | Testing equipment and testing method for corrosion life of corrosion-resistant material |
| CN109946118A (en) * | 2019-03-22 | 2019-06-28 | 夸克能源工程实验室(深圳)有限公司 | A kind of Portable oil-gas water-sampling device |
| CN109946118B (en) * | 2019-03-22 | 2023-11-10 | 夸克能源工程实验室(深圳)有限公司 | Portable oil-gas-water sampling device |
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| CN113295604A (en) * | 2021-05-21 | 2021-08-24 | 中国石油化工股份有限公司 | Test device and test method for simulating dynamic corrosion of solid waste salt |
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| CN113720759A (en) * | 2021-09-02 | 2021-11-30 | 中铁二十局集团有限公司 | Simulation test device for tunnel surrounding rock concrete spray layer in corrosive solution |
| CN114235671A (en) * | 2021-12-16 | 2022-03-25 | 中国科学院武汉岩土力学研究所 | Metal supported CO2Indoor test device for corrosion degree evaluation |
| CN114235671B (en) * | 2021-12-16 | 2023-09-15 | 中国科学院武汉岩土力学研究所 | Metal is received CO 2 Corrosion degree evaluation indoor test device |
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Application publication date: 20130102 |