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Method for testing hydrogen sulfide stress corrosion resistance of oil well pipe

A technology of stress corrosion and hydrogen sulfide resistance, applied in the direction of testing the strength of materials, measuring devices, instruments, etc. by applying a stable bending force, it can solve the problems of harsh test conditions, high quality requirements for operators, complex model design and theoretical calculations, etc.

Inactive Publication Date: 2019-05-28
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 hydrogen sulfide corrosion resistance
While the standard double cantilever beam test provides a measure of the resistance of metallic materials to EC expansion, K ISSC for SSC, K IEC EC is used in more common cases. According to the crack arrest type of fracture mechanism test, it is expressed as critical stress intensity factor. This method can quantify the direct level of crack growth resistance, but the model design and theoretical calculation are complicated, and the quality requirements of operators High, the field test is difficult and cannot be realized

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  • Method for testing hydrogen sulfide stress corrosion resistance of oil well pipe
  • Method for testing hydrogen sulfide stress corrosion resistance of oil well pipe
  • Method for testing hydrogen sulfide stress corrosion resistance of oil well pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The samples used in the test are three kinds of oil well pipes A, B, and C, and the three kinds of oil well pipes are three different oil well pipes (for example: oil well pipes with different materials or different processes such as rolling and heat treatment, the following implementation Same explanation here). Three parallel samples of each oil well pipe, the test method consists of a sample processing, b surface treatment, c bending loading test and d sample surface morphology observation and calculation of corrosion pit depth.

[0023] In step a, the sample is processed into a size of 115mm*15mm*5mm, and the surface finish is 0.3μm;

[0024] In step b, the surface treatment test was washed twice with acetone, and then once with absolute ethanol to remove the residue and grease on the surface of the sample;

[0025] In the step c, the bending loading test adopts the four-point bending loading method, and the loading is carried out according to 50% of the nominal yi...

Embodiment 2

[0030] The samples used in the test are oil well pipes A, B, and C, and three parallel samples of each oil well pipe. The test method consists of a sample processing, b surface treatment, c bending loading test and d sample surface morphology Composed of observation and calculation of corrosion pit depth.

[0031] In step a, the sample is processed into a size of 115mm*15mm*5mm, and the surface finish is 0.3μm;

[0032] In step b, the surface treatment test was washed twice with acetone, and then once with absolute ethanol to remove the residue and grease on the surface of the sample;

[0033] In the step c, the bending loading test adopts the four-point bending loading method, and the loading is carried out according to 90% of the nominal yield strength of the oil well pipe. It is the actual well fluid in the oil field, and the test period is 720h without breaking. After the test, the surface rust layer is treated according to the standard GB / T-19292.4, the method of removin...

Embodiment 3

[0038] The samples used in the test are oil well pipes A, B, and C, and three parallel samples of each oil well pipe. The test method consists of a sample processing, b surface treatment, c bending loading test and d sample surface morphology Composed of observation and calculation of corrosion pit depth.

[0039] In step a, the sample is processed into a size of 115mm*15mm*5mm, and the surface finish is 0.3μm;

[0040] In step b, the surface treatment test was washed twice with acetone, and then once with absolute ethanol to remove the residue and grease on the surface of the sample;

[0041] In step c, the bending loading test adopts the four-point bending loading method, and the loading is carried out according to 80% of the nominal yield strength of the oil well pipe. It is a saturated hydrogen sulfide A solution (nace standard), and the test period is 720h without breaking. After the test, the surface rust layer is treated according to the standard GB / T-19292.4, the meth...

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Abstract

The invention discloses a method for testing hydrogen sulfide stress corrosion resistance of an oil well pipe. The method comprises the steps that after a sample which does not lose efficacy in bending loading is subjected to surface derusting treatment, sample surface morphology observation and corrosion pit depth measurement are conducted on the sample by adopting a laser scanning confocal microscope, and the stress corrosion resistance of the oil well pipe material is evaluated according to the corrosion pit depth of the surface of the tensile stress side of the sample. According to the method, the stress corrosion sensitivity of the oil wall pipe is evaluated through corrosion morphology observation and corrosion pit depth measurement, quantifiable grading is conducted on the sample which does not lose efficacy in bending loading without adding extra tests, accordingly, the corrosion resistance of the oil well pipe material is evaluated in a specific working condition environment,and guidance is provided for material selection and equipment maintenance.

Description

technical field [0001] The invention provides a test method for the stress corrosion resistance of oil well pipes, specifically a method for evaluating the stress corrosion resistance of oil well pipes by bending loading samples and measuring the depth of corrosion pits on the surface of the samples, which belongs to corrosion performance detection field. Background technique [0002] In the total amount of steel used in the petroleum industry, steel for oil well pipes accounts for more than 40%. In recent years, with the exploration and development of oil and gas wells in ultra-deep, ultra-high temperature, and ultra-high corrosion harsh environments, the working conditions of oil and gas wells generally have "high temperature, high pressure, high CO 2 , high H 2 S, high Cl - These complex and harsh working conditions combined with special operating techniques lead to stress corrosion failure of oil well pipes, seriously affecting the normal production and operation of o...

Claims

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Application Information

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IPC IPC(8): G01N3/20G01B11/24
Inventor 钟彬陈义庆高鹏李琳艾芳芳孟凡磊肖宇武裕民孙杭于洋
Owner ANGANG STEEL CO LTD
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