CN105403503A - High-temperature corrosion and erosion testing device of bent pipe column of oil well pipe - Google Patents
High-temperature corrosion and erosion testing device of bent pipe column of oil well pipe Download PDFInfo
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Abstract
The invention provides a high-temperature corrosion and erosion testing device of a bent pipe column of an oil well pipe. The high-temperature corrosion and erosion testing device comprises an erosion and corrosion channel, an electrochemical work station and a storage tank, wherein the storage tank comprises a storage tank secondary cavity and a storage tank main cavity, which are arranged in sequence from bottom to top; the upper end of the storage tank secondary cavity is communicated with the upper part of the storage tank main cavity through a connection channel, and a secondary temperature controller is arranged at the bottom of the lower end of the storage tank secondary cavity; the erosion and corrosion channel comprises an erosion and corrosion box body, and the two ends of the erosion and corrosion box body are communicated with the storage tank main cavity through a main pipeline and a main loop respectively; the erosion and corrosion box body is provided with a plurality of sample mounting holes; the main pipeline is communicated with the storage tank main cavity through a gas pipeline and a liquid pipeline, which are arranged in parallel; a gas flow controller and a gas control valve are arranged on the gas pipeline connected onto the upper part of the storage tank main cavity respectively; a liquid flow controller and a liquid control valve are arranged on the liquid pipeline connected onto the lower part of the storage tank main cavity respectively; the upper end of the gas flow controller is connected with the upper end of the liquid flow controller through a communication pipeline and the communication pipeline is provided with a regulating and controlling valve; and the electrochemical work station is connected with a sample.
Description
Technical field
The present invention relates to oil well pipe corrosion evaluation field, be specially a kind of high temperature corrosion and erosion test device of oil well pipe flexing tubing string.
Background technology
In oil gas well mining process, down-hole string can produce various types of corrosion, and wherein, the erosion effect of the high-velocity fluid in pit shaft to oil well pipe is particularly remarkable.Because high-velocity fluid makes corrosive medium (H
2s, CO
2, Cl
-deng) and gravel etc. move on the metal surface (impacting or turbulent flow), in mechanical wear with under corrosion acting in conjunction, corrosion is accelerated.In gas well recovery process, high-speed gas contains water vapor, and it is irregular to flow, and make bubble constantly produce in metal surface and disappear, consequent water hammering makes metal surface protection film rupture, exacerbates the erosion damage on oil well pipe surface.
Along with the exploitation of ultra deep well, orientation well, horizontal well, tubing string deforms because of stressed complexity, causes down-hole string that Helical Buckling, dextrorotation flexing or irregular bending deformation easily occur.The bending deformation of oil well pipe makes the runner of fluid there occurs change, accelerates the erosion damage of tubing string further, reduces the serviceable life of oil well pipe, has a strong impact on Oil/gas Well production generation.
For this reason, the erosion damage mechanism, preventive measure etc. of scientific research technician to oil well pipe have carried out large quantifier elimination, also develop the test unit of some research oil well pipe erosion corrosion performances simultaneously.
The experimental facilities can evaluating oil well pipe erosion property is at present few, mainly contain: (1) Chinese patent CN104330320A discloses " a kind of oil well pipe erosion high temperature corrosion acting in conjunction measurement mechanism ", this device is provided with simulation erosion case, comb, corrosion simulation case, constant flow pump, blast nozzle etc.Constant flow pump extracts simulated solution from corrosion simulation case, carries out erosion through blast nozzle to sample, and simulated solution flows into corrosion simulation case through comb; (2) disclose in Chinese patent CN103149144A " a kind of oil well pipe high temperature corrosion erosion property test unit ", this device is provided with high temperature and high pressure kettle, screw feeder, mixer, water pump, nozzle etc.Shake out to screw feeder, fluid to water pump from autoclave, the sand in screw feeder and the liquid in water pump are mixed to form erosion fluid to mixer, then from nozzle ejection, carry out erosion to sample; (3) disclose in Chinese patent CN102493767A " a kind of gas drilling erosion test method ", first the method is heated up with hot environment under simulation well to erosion medium by heating system, then monitor erosion medium parameter in real time by sampler, the magnitude of inclination finally by the jet size regulated in erosion system and metal baffle completes erosion experiment.
The first test unit can obtain weight eroded, etching extent and the coefficient recruitment of erosion corrosion under erosion corrosion acting in conjunction in same set of device; Second and third kind of analogue means is only subject to the situation of erosion by condition simulation oil well pipes such as alter erosion rate, adjustment impact angles.Above device all can not simulation oil well tubing string stressed, occur flexing when erosion corrosion situation; And above device characterizes erosion corrosion speed by means of only the weightlessness of sample, can not provide the thermodynamics information of erosion corrosion.
Summary of the invention
For problems of the prior art, the invention provides a kind of high temperature corrosion and erosion test device of oil well pipe flexing tubing string, it can meet the testing requirements under multiple condition, improves operability and the completeness of test, completes adjustment and the monitoring of many kinds of parameters in single test.
The present invention is achieved through the following technical solutions:
The high temperature corrosion of oil well pipe flexing tubing string and an erosion test device, comprise erosion corrosion passage, electrochemical workstation and storage tank; Storage tank comprises the secondary cavity of the storage tank set gradually from top to bottom and storage tank main cavity; The secondary cavity upper end of storage tank is communicated with storage tank main cavity top by interface channel, and lower end base arranges secondary thermostat; Erosion corrosion passage comprises the erosion corrosion casing that two ends are communicated with storage tank main cavity with major loop respectively by main line; Erosion corrosion casing is arranged multiple sample installing port for fixed sample; Main line is communicated with storage tank main cavity with liquid line through the gas piping of parallel connection; The gas piping being connected to storage tank main cavity top arranges gas flow controller and gas control valve respectively; The liquid line being connected to storage tank main cavity bottom arranges liquid flow controller and liquid control valve respectively; Gas flow controller is connected by connecting pipeline with the upstream extremity of liquid flow controller, and connecting pipeline arranges controlling valve; Electrochemical workstation is connected with sample, for measuring the thermodynamics information of sample under high temperature corrosion erosion by sample installing port.
Preferably, sample installing port is arranged through the sample cell that fastener is fixing; Sample cell comprises the sample pickup groove and Sample location groove of fixing encapsulation from outside to inside successively; Sample pickup groove medial extremity clamps sample by sample fixture, and Sample location groove and sample installing port are tightly connected by encapsulant with the sample fixture running through setting.
Further, sample pickup groove outer end is disposed radially location swaging clamp, and sample installing port arranges positioning disk; Positioning disk is provided with and the location cutting of locating swaging clamp and coordinating; The angle of the sign of location cutting is corresponding with sample impact angle in erosion corrosion casing.
Further, sample fixture comprises fixture, and is arranged on the interior dielectric pin for fixed sample of fixture and is arranged on for applying the charger of loading force to sample on fixture, and charger is exerted pressure by insulation pressure head and sample contacts.
Preferably, storage tank is arranged respectively pressure of storage tank table and storage tank hygrometer, stirrer and the funnel in the portion that inserts into the inner are set in storage tank main cavity.
Preferably, main line is from upstream to downstream and sets gradually multiphase flow flowmeter, main thermostat and main line tensimeter.
Preferably, erosion corrosion casing outer setting heat-insulation layer, the part of counter sample arranges transparent observing window; The porch of erosion corrosion casing arranges casing hygrometer, and exit arranges pH meter, major loop porch set temperature meter.
Preferably, on storage tank, connection is provided with waste gas and liquids treatment system.
Preferably, the endpiece of storage tank and erosion corrosion casing arranges back flush passage; Back flush passage once arranges air supply tank and vacuum pump from storage tank side.
Preferably, the downstream part of gas piping and liquid line is respectively arranged with gas sample mouth and liquid sampling mouth.
Compared with prior art, the present invention has following useful technique effect:
The present invention realizes the supply to gas and liquid by the storage tank arranged, the secondary thermostat that utilization is arranged completes the preliminary control to temperature, coordinate the gas flow controller of the gas piping that arranges respectively and liquid line and correspondence and liquid flow controller can meet its control overflow to corrosive medium, temperature and flow, utilize different combinations can reach various trystate, can measure containing the weight eroded under condensation aqueous vapor phase, gas-particle two-phase, liquid phase or liquid-solid two-phase fluid effect, achieve a kind of device multiple use, meet test demand; And the thermodynamics information of sample etches is measured by the electrochemical workstation introduced; Wherein secondary temperature regulating device also can ensure the humidity in gas phase and gas-particle two-phase erosion test process; Complete the weight eroded simultaneously measured under simple high temperature corrosion erosion effect, weight eroded under the stressed generation flexion of sample and both residual quantity.
Further, correspondence can be carried out according to different research contents by the setting of sample cell and arrange, place difform sample; Simultaneously because being provided with scale groove in simulation erosion corrosion channel roof, the sample erosion situation under different impact angle (0 ° ~ 90 °) can be simulated.
Further, by the clamping of dielectric pin and the setting of charger, can ensure test of exerting pressure while sample stable holding.
Further, utilize the main thermostat arranged before fluid enters test, more once can to adjust, warranty test pipeline section reaches expection test temperature.
Further, by the transparent observing window being positioned at simulation erosion passage arranged, can the corrosion condition of Real Time Observation sample.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of test unit described in example of the present invention.
Fig. 2 is the top view cross section view of storage tank described in example of the present invention.
Fig. 3 is the vertical view at the place of sample installing port described in example of the present invention.
Fig. 4 is the left profile of erosion corrosion casing described in example of the present invention view.
Fig. 5 is sample scheme of installation described in example of the present invention; A () sample for not loading, (b) is flexing sample.
In figure: 1 is erosion corrosion passage, 2 is electrochemical workstation, 3 is storage tank, 4 is air supply tank, 5 is gas flow controller, 6 is liquid flow controller, 7 is vacuum pump, 8 is waste gas and liquids treatment system, 9 is sample installing port, 10 is casing hygrometer, 11 is transparent observing window, 12 is pH meter, 13 is main line tensimeter, 14 is main thermostat, 15 is multiphase flow flowmeter, 16 is liquid sampling mouth, 17 is gas sample mouth, 18 is storage tank main cavity, 19 is the secondary cavity of storage tank, 20 is secondary thermostat, 21 is stirrer, 22 is funnel, 23 is pressure of storage tank table, 24 is storage tank hygrometer, 25 is thermometer, 26 is back flush passage, 27 is superfeed pressure table, 28, 29 and 33-37 be valve, 30 is liquid control valve, 31 controlling valves, 32 is gas control valve, 38 is erosion corrosion casing, 39 is sample, 40 is location cutting, 41 is location swaging clamp, 42 is positioning disk, 43 is sample cell, 44 is fastener, 45 is heat-insulation layer, 46 is Sample location groove, 47 is sample pickup groove, 48 is fixture, 49 is encapsulant, 50 is dielectric pin, 51 is charger, 52 is insulation pressure head, 53 is main chamber liquid level gauge, 54 is secondary chamber liquid level gauge.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, and the explanation of the invention is not limited.
As shown in Figure 1, a kind of test unit for evaluating oil well pipe flexing tubing string high temperature corrosion erosion property that the present invention proposes, it comprises erosion corrosion passage 1, electrochemical workstation 2, storage tank 3, air supply tank 4, gas flow controller 5, liquid flow controller 6, vacuum pump 7 and a waste gas and liquids treatment system 8.
As depicted in figs. 1 and 2, described erosion corrosion passage 1 comprises erosion corrosion casing 38, multiple sample installing port 9 be positioned at above erosion corrosion casing 38, one is positioned at hygrometer 10 on erosion corrosion casing 38 and pH meter 12, transparent observing window 11 be positioned on erosion corrosion casing 38 sidewall; Described electrochemical workstation 2 is connected on testing sample 39; Described storage tank 3 comprises the electric mixer 21 that is positioned at storage tank main cavity 18, one is fixed on storage tank 3 top and gos deep into the funnel 22 bottom storage tank main cavity 18, one to be positioned at storage tank 3 bottommost be secondary temperature regulating device 20, one is positioned at the secondary cavity 19 of a storage tank on secondary temperature regulating device 20, one is fixed on storage tank hygrometer 24 on storage tank 3 and 23, two, tensimeter is positioned at the main chamber liquid level gauge 53 and the secondary chamber liquid level gauge 54 that storage tank 3 are respectively used to measure storage tank main cavity 18 and the secondary cavity 19 of storage tank; Described air supply tank 4 comprises superfeed pressure table 27 fixed thereon; Described gas flow controller 5 is connected to storage tank 3 by gas piping, and the other end is connected to erosion corrosion passage 1 by gas piping and main line; Described liquid flow controller 6 is connected to storage tank 3 by liquid line, and the other end is connected to erosion corrosion passage 1 by liquid line and main line; Described vacuum pump 7 is connected to air supply tank 4 by pipeline, and the other end is connected to erosion corrosion passage 1 by pipeline; Described waste gas and liquids treatment system 8 is connected to storage tank 3 by pipeline, and air supply tank 4 and waste gas and liquids treatment system 8 are communicated with the secondary cavity of storage tank main cavity 18 and storage tank respectively.
Described erosion corrosion casing 38 multiple position can install sample according to research contents at top, and wherein an installation place connects electrochemical workstation, for measuring the thermodynamics information of high-temperature sample erosion corrosion; Described erosion corrosion casing 38 is provided with pH meter 12 and casing hygrometer 10, for the pH in monitoring channel and humidity.Wherein, casing hygrometer 10 is the humidity for measuring gas-solid phase, gas phase erosion corrosion fluid.
Described main line is provided with tensimeter 13, main thermostat 14 and a multi-phase flowmeter 15; Gas piping and liquid line arrange a vapor phase stream gauge, a liquid phase stream gauge and two sample taps respectively.
Vacuum pump 7 as described in Figure 1, is connected to air supply tank 4 by pipeline, and the other end is connected to erosion corrosion passage 1 by pipeline, as the back flush passage 26 of loop erosion corrosion system.
As shown in Figure 1, Figure 3 and Figure 4 on described sample installing port 9, be provided with multiple positioning disk 42, positioning disk 42 has multiple location cutting 40, indicating angle is 0 ° ~ 90 °; By the position of adjustment location swaging clamp 41, install fastener 44, can carry out expecting the test of impact angle, the sensing of location swaging clamp 41 is corresponding, contrary, identical with the erosion direction of sample or be the angle that necessarily converts.
As described in Figure 4 outside erosion corrosion casing 38, heat-insulation layer 45 is set, to guarantee that test can reach expection test temperature.
As described in Fig. 4 and Fig. 5, sample cell 43 comprises the Sample location groove 46 being positioned at below and the sample pickup groove 47 being positioned at top, and sample cell 43 all adopts encapsulant 49 to be connected with between positioning disk 42, sample clamp 48.
Sample clamp 48 as described in Figure 5, is provided with dielectric pin 50, for fixed sample; Be provided with charger 51, charger adopts insulation pressure head 52, to avoid bimetallic corrosion simultaneously; The two ends of preferred sample 39 misplace to folder respectively by two dielectric pin 50, and charger adopts the screw that can regulate to load from centre it, and its termination arranges insulation pressure head 52 and contacts with sample 39 and exert a force.
Use of the present invention and the course of work as follows:
Sample is arranged on sample cell 43 after making sample 39 generation expection distortion by adjustment charger 51, and adjustment location swaging clamp 41, to expecting the location cutting 40 that impact angle is corresponding, installs fastener 44, and access electrochemical workstation 2 completes sample and installs;
To annotate in storage tank 3 erosion fluid, add gravel by funnel 22, pass into N
2or other gas deoxygenations, then pass into corrosive gas (H by research contents requirement by air supply tank 4
2s, CO
2deng);
For hot environment under simulation well, the secondary thermostat 20 of tank bottom can be utilized to preheat to the erosion medium in storage tank, and make it even by electric mixer 21 stirred fluid;
When the gas-solid phase time that erosion fluid is with condensation water, Open valve 29 and controlling valve 31, valve-off 28, liquid control valve 30 and gas control valve 32; Inject simulated formation water in the secondary cavity 19 of storage tank, in main cavity, add gravel by funnel 22; Corrosive gas is through flowing into main cavity 18 by the simulated formation water of the secondary cavity 19 of storage tank; Flow is controlled by gas flow controller 5; Main thermostat 14 pairs of erosion fluids carry out post bake to desired temperature; Erosion fluid flows through erosion corrosion passage 1, after the erosion corrosion of complete paired samples 39, flows into storage tank main cavity 18 by the road; In process of the test, multiphase flow flowmeter 15 pairs of flows enter to check, and thermometer 25 pairs of temperature are checked, and pressure measured by main line tensimeter 13, and humidity measured by casing hygrometer 10, can carry out sample analysis by gas sample mouth 17 to the erosion fluid in specimen.
When erosion fluid is the gas phase with condensation water, Open valve 29 and gas control valve 32, valve-off 28, liquid control valve 30 and controlling valve 31; Except not injecting except gravel, other test operations are identical with gas-particle two-phase erosion test.
When erosion fluid is liquid-solid two-phase, open liquid control valve 30 and valve 28, valve-off 29, controlling valve 31 and gas control valve 32; Storage tank main cavity 18 and the secondary cavity 19 of storage tank all inject simulated formation water, add gravel by funnel 22 in main cavity; Corrosive gas is through flowing into storage tank main cavity 18 by the simulated formation water of the secondary cavity 19 of storage tank; Flow is controlled by liquid flow controller 6; Main thermostat 14 pairs of erosion fluids carry out post bake to desired temperature; Erosion fluid flows through erosion corrosion passage 1, after the erosion corrosion of complete paired samples 39, flows into storage tank main cavity 18 by the road; In process of the test, multiphase flow flowmeter 15 pairs of flows enter to check, and thermometer 25 pairs of temperature are checked, and pressure measured by main line tensimeter 13.The liquid level of storage tank main cavity 18 and the secondary cavity 19 of storage tank is measured respectively by main chamber liquid level gauge 52 and secondary chamber liquid level gauge 53.Sample analysis can be carried out to the erosion fluid in specimen by liquid sampling mouth 16.
When erosion fluid is liquid phase, except not annotating except gravel, other processs of the test are identical with liquid-solid two-phase.
In process of the test, obtain the thermodynamics information such as polarization curve, AC impedance by electrochemical workstation 2; By the corrosion condition of transparent observing window 11 Real Time Observation sample.
After erosion test completes, the fluid in pilot system is passed into waste gas and liquids treatment system 8;
Take out sample 39, Treatment Analysis is carried out to sample, obtain the dynamic information, corrosion product information etc. of erosion corrosion;
For extending the serviceable life of rig for testing, ensureing its safe operation, after having tested, adopting the test unit of back flush passage 26 pairs of oil well pipe flexing tubing string high temperature corrosion erosion properties to rinse.
Claims (10)
1. the high temperature corrosion of oil well pipe flexing tubing string and an erosion test device, is characterized in that, comprise erosion corrosion passage (1), electrochemical workstation (2) and storage tank (3);
Described storage tank (3) comprises the secondary cavity (19) of the storage tank set gradually from top to bottom and storage tank main cavity (18); Secondary cavity (19) upper end of storage tank is communicated with storage tank main cavity (18) top by interface channel, and lower end base arranges secondary thermostat (20);
Described erosion corrosion passage (1) comprises the erosion corrosion casing (38) that two ends are communicated with storage tank main cavity (18) with major loop respectively by main line; Erosion corrosion casing (38) is arranged multiple sample installing port (9) for fixed sample (39);
Main line is communicated with storage tank main cavity (18) with liquid line through the gas piping of parallel connection; The gas piping being connected to storage tank main cavity (18) top arranges gas flow controller (5) and gas control valve (32) respectively; The liquid line being connected to storage tank main cavity (18) bottom arranges liquid flow controller (6) and liquid control valve (30) respectively; Gas flow controller (5) is connected by connecting pipeline with the upstream extremity of liquid flow controller (6), connecting pipeline is arranged controlling valve (31);
Described electrochemical workstation (2) is connected with sample (39) by sample installing port (9), for measuring sample (39) thermodynamics information under high temperature corrosion erosion.
2. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 1 and erosion test device, is characterized in that, described sample installing port (9) is arranged through the sample cell (43) that fastener (44) is fixing; Sample cell (43) comprises the sample pickup groove (47) and Sample location groove (46) of fixing encapsulation from outside to inside successively; Sample pickup groove (47) medial extremity clamps sample (39) by sample fixture, and Sample location groove (46) and sample installing port (9) and the sample fixture running through setting are tightly connected by encapsulant (49).
3. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 2 and erosion test device, it is characterized in that, described sample pickup groove (47) outer end is disposed radially location swaging clamp (41), sample installing port (9) is arranged positioning disk (42); Positioning disk (42) is provided with and the location cutting (40) of locating swaging clamp (41) and coordinating; The angle of the sign of location cutting (40) is corresponding with sample (39) impact angle in erosion corrosion casing (38).
4. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 2 and erosion test device, it is characterized in that, sample fixture comprises fixture (48), and be arranged on the interior dielectric pin (50) for fixed sample (39) of fixture (48) and be arranged on for applying the charger (51) of loading force to sample (39) on fixture (48), charger (51) is contacted with sample (39) by insulation pressure head (52) and exerts pressure.
5. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 1 and erosion test device, it is characterized in that, storage tank (3) is arranged respectively pressure of storage tank table (23) and storage tank hygrometer (24), stirrer (21) and the funnel (22) in the portion that inserts into the inner are set in storage tank main cavity (18).
6. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 1 and erosion test device, it is characterized in that, main line is from upstream to downstream and sets gradually multiphase flow flowmeter (15), main thermostat (14) and main line tensimeter (13).
7. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 1 and erosion test device, it is characterized in that, erosion corrosion casing (38) outer setting heat-insulation layer (45), the part of counter sample (39) arranges transparent observing window (11); The porch of erosion corrosion casing (38) arranges casing hygrometer (10), and exit arranges pH meter (12), major loop porch set temperature meter (25).
8. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 1 and erosion test device, is characterized in that, the upper connection of storage tank (3) is provided with waste gas and liquids treatment system.
9. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 1 and erosion test device, it is characterized in that, the endpiece of storage tank (3) and erosion corrosion casing (38) arranges back flush passage (26); Back flush passage (26) once arranges air supply tank (4) and vacuum pump (7) from storage tank (3) side.
10. the high temperature corrosion of a kind of oil well pipe flexing tubing string according to claim 1 and erosion test device, it is characterized in that, the downstream part of gas piping and liquid line is respectively arranged with gas sample mouth (17) and liquid sampling mouth (16).
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| CN201510763429.0A CN105403503B (en) | 2015-11-10 | 2015-11-10 | A kind of high temperature corrosion of oil well pipe buckling tubing string and erosion test device |
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| CN106525628A (en) * | 2016-11-08 | 2017-03-22 | 浙江理工大学 | Erosion test device and method with capacity of controlling temperature, angle, flow velocity and time |
| CN107121376A (en) * | 2017-04-26 | 2017-09-01 | 中国石油大学(北京) | HTHP gas-liquid two-phase H2S/CO2The corrosion simulated cyclic system of environment original position load |
| CN107228806A (en) * | 2017-07-06 | 2017-10-03 | 广西大学 | A kind of experimental provision for being used to simulate high-temperature molten salt erosion-corrosion environment |
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| CN108469390A (en) * | 2018-01-26 | 2018-08-31 | 浙江理工大学 | Detachable loop-type single-phase flow wash-out testing device |
| CN109142205A (en) * | 2018-09-11 | 2019-01-04 | 长江大学 | Gas well takes liquid and takes sand erosion-corrosion experiment device |
| CN109612922A (en) * | 2019-01-10 | 2019-04-12 | 鞍钢股份有限公司 | A kind of simulation marine propeller Service Environment corrosion testing apparatus and test method |
| CN109612922B (en) * | 2019-01-10 | 2021-08-20 | 鞍钢股份有限公司 | Test device and test method for simulating marine propeller service environment corrosion |
| CN111077062A (en) * | 2019-12-18 | 2020-04-28 | 中国石油天然气集团有限公司 | Sleeve hole erosion test system and method |
| CN111077062B (en) * | 2019-12-18 | 2023-08-22 | 中国石油天然气集团有限公司 | Casing hole erosion test system and method |
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