Device and method for testing hydrogen sulfide stress corrosion resistance of oil well pipe

A hydrogen sulfide-resistant and stress-corrosion-resistant technology, applied in the direction of measuring devices, weather resistance/light resistance/corrosion resistance, using stable tension/pressure to test the strength of materials, etc., can solve complex model design and theoretical calculations, complex theoretical calculations, Issues such as failure and non-failure to achieve the effect of reducing human measurement errors

Active Publication Date: 2020-05-12
ANGANG STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, tensile, bending beam and C-ring tests can directly evaluate the hydrogen sulfide corrosion resistance of oil well pipes, but they all have harsh test conditions, high requirements for sample processing precision, and the test results can only give information about failure or non-failure , unable to quantitatively evaluate the performance level of hydrogen sulfide corrosion resistance
[0004] The standard double cantilever beam test provides a measure of the resistance of metallic materials to EC propagation, KISSC for SSC and KIEC for EC in the more general case, according to the type of crack arrest tested by the fracture mechanism, expressed as a critical stress intensity factor, this method It can quantify the direct level of crack growth resistance, but the model design and theoretical calculation are complicated, the requirements for the quality of operators are high, the theoretical calculation is complicated, and the field test is difficult, so it cannot be realized
[0005] The stress ring test is a method commonly used to evaluate the stress corrosion resistance of materials. Usually, the standard solution of method A is used. The equipment is simple and the requirements for operators are not high. It is qualified if it is not broken for 720 hours. Observe whether there are cracks on the surface of the sample; however, the test results only give the failure and non-failure information, and for the unfailed samples, the stress corrosion resistance performance level of the sample cannot be evaluated; it needs to be comprehensively evaluated in combination with other test results, such as slow strain rate Tensile test (SSRT), which requires reworking the test specimen, after adding the standard solution, the specimen is stretched at a slow and constant strain rate on a slow strain rate tensile testing machine until it breaks, by tensile property data Evaluation of stress corrosion cracking sensitivity, the stress corrosion sensitivity index is defined as: η=(Ψ0-Ψ1) / Ψ0, where Ψ0 is the reduction of area, yield strength or elongation in air, and Ψ1 is the reduction of area in the medium rate, yield strength or elongation
Additional tests are used to complete the evaluation of the stress corrosion resistance of unfailed samples, which prolongs the test period, or requires the purchase of new equipment, resulting in low test efficiency and high cost

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  • Device and method for testing hydrogen sulfide stress corrosion resistance of oil well pipe
  • Device and method for testing hydrogen sulfide stress corrosion resistance of oil well pipe
  • Device and method for testing hydrogen sulfide stress corrosion resistance of oil well pipe

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Experimental program
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Embodiment 1

[0042] In this embodiment, the samples used in the test are oil well pipes A and B, and three parallel samples are made for each material. The test process is as follows:

[0043] A) if figure 2 As shown, the processing size of sample 3 is the diameter of the test area D=φ6.35±0.13mm, the length G=25.4±0.2mm, and the transition fillet between the test area of ​​the sample and the clamping section at both ends is R; after processing The surface finish of sample 3 is 0.2 μm; the surface of sample 3 after processing is scrubbed twice with acetone, and then scrubbed with absolute ethanol once to remove the residue and grease on the surface of sample 3;

[0044] B) mark the sample test area, mainly marking the middle point and the upper and lower boundary points of the sample test area, so as to facilitate the identification of the laser detector 6;

[0045] C) Fix the laser detector 6 and the laser detector moving device 9 on the slideway, keep the slideway level, adjust the pos...

Embodiment 2

[0055] In this embodiment, the samples used in the test are oil well pipes A and B, and three parallel samples are made for each material. The test process is as follows.

[0056] A) if figure 2 As shown, the processing size of sample 3 is: the diameter of the test area of ​​the sample D=φ6.35±0.13mm, the length G=25.4±0.2mm, the surface finish of sample 3 after processing is 0.2μm; the processed sample 3 Scrub the surface twice with acetone, and then scrub it once with absolute ethanol to remove the residue and grease on the surface of sample 3;

[0057] B) mark the sample test area, mainly marking the middle point and the upper and lower boundary points of the sample test area, so as to facilitate the identification of the laser detector 6;

[0058] C) fixing the laser detector 6 and the laser detector moving device on the slideway, keeping the slideway horizontal, so that the laser beam emitted by the laser detector 6 is vertically irradiated onto the measured surface of ...

Embodiment 3

[0068] In this embodiment, the samples used in the test are oil well pipes A and B, and three parallel samples are made for each material. The test process is as follows:

[0069] A) if figure 2 As shown, the processing size of sample 3 is: the diameter of the sample test area D=φ6.35±0.13mm, the length G=25.4±0.2mm, the surface finish of sample 3 after processing is 0.2μm; the processed sample 3 Scrub the surface twice with acetone and once with absolute ethanol to remove the residue and grease on the surface of sample 3;

[0070] B) mark the sample test area, mainly marking the middle point and the upper and lower boundary points of the sample test area, so as to facilitate the identification of the laser detector 6;

[0071] C) fixing the laser detector 6 and the laser detector moving device on the slideway, keeping the slideway horizontal, so that the laser beam emitted by the laser detector 6 is irradiated vertically to the measured surface of the sample 3;

[0072] D)...

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Abstract

The invention relates to a device and a method for testing hydrogen sulfide stress corrosion resistance of an oil well pipe. The device comprises a stress ring test device, a laser detector, a detector moving device, a horizontal calibration device and a control system, wherein the laser detector is composed of a laser source and a detector rotating device; the horizontal calibration device is composed of a lifting base and a horizontal rod, a detector moving device is arranged on the corresponding rod section, stretching into the liquid storage tank, of the horizontal rod, and the laser detector is installed on the detector moving device and can horizontally move along the sliding way; the laser source in the laser detector can rotate up and down around a horizontal axis under the actionof the detector rotating device; the horizontal rod can be driven by the lifting base to vertically ascend and descend. The stress corrosion performance of the sample can be evaluated by observing thestress ring loading test in real time and measuring the elongation of the sample in the loading process so as to further analyze the non-failure sample without adding extra test and equipment.

Description

technical field [0001] The invention relates to the technical field of material corrosion performance detection, in particular to a device and method for testing oil well pipe resistance to hydrogen sulfide stress corrosion. Background technique [0002] Stress corrosion cracking (Stress Corrosion Cracking-SCC) refers to the phenomenon of delayed cracking or delayed fracture of metal materials subjected to tensile stress in certain specific media due to the synergistic effect of corrosive media and stress. Compared with other forms of corrosion damage, stress corrosion cracking has a fast crack growth rate, sudden fracture, and the highest risk factor, which is likely to cause major accidents. [0003] In view of the above situation, it is necessary to test and evaluate the stress corrosion resistance of the material, according to NACE StandardTM0177-2005 "Indoor Test of Metal Resistance to Sulfide Stress Corrosion Cracking and Stress Corrosion Cracking in H2S Environment" a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/02G01N17/00
CPCG01N3/08G01N3/02G01N17/006G01N2203/0003G01N2203/0017G01N2203/006G01N2203/024G01N2203/0252G01N2203/0268G01N2203/0641G01N2203/0682
Inventor 钟彬陈义庆高鹏艾芳芳李琳伞宏宇苏显栋肖宇
Owner ANGANG STEEL CO LTD
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