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.
CN109813612AInactive Publication Date: 2019-05-28ANGANG STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANGANG STEEL CO LTD
Publication Date
2019-05-28
Estimated Expiration
Not applicable · inactive patent

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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.
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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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