Combined-loading stress corrosion testing apparatus and method

Abstract

The invention provides a combined-loading stress corrosion testing apparatus. The apparatus comprises a tension ring; a hermetically arranged environmental container; a gas inlet pipe, a gas outlet pipe, a thermocouple and a pressure sensor which extend into the environmental container from above; upper and lower clamps respectively arranged at the upper and lower ends of the environmental container; a loading bolt in threaded connection with the free end of the lower clamp; a rotary motor connected with the free end of the upper clamp; an electromagnetic stirrer arranged in the lower part of the environmental container; and a magneton arranged in the container. The radial end of the tension ring is fixedly connected with the upper clamp, and the other end of the tension ring is connected with the end, far away from the lower clamp, of the loading bolt; and the tension ring applies tension on the upper and lower clamps through rotation of the loading bolt. A testing method based on the apparatus is used for research on corrosion resistance of a drilling rod, an oil sleeve material and the like in an oil and gas well with high temperature, high pressure and a multiphase flow corrosive medium under complex stress conditions including drawing, torsion and liquid flow impact.

Description

technical field [0001] The invention relates to the research of petroleum exploration equipment, in particular to a composite loading stress corrosion test device and method. Background technique [0002] In recent years, due to the presence of corrosive media such as hydrogen sulfide in oil and gas fields, stress corrosion cracking of drill pipes, oil casings and other materials has occurred frequently. Stress corrosion cracking is the premature failure of materials below their yield strength, which is sudden and unpredictable, and there is a great potential safety hazard. Most of the existing stress corrosion test devices are constant load test devices that are simply subjected to tensile or bending stress, while the drill pipe and oil casing materials in the oil field are not only subjected to tensile stress, but also to a certain torque, bending moment, Vibration, as well as fluid impact, the simulation test under a single stress condition cannot match the actual workin...

AI Technical Summary

Problems solved by technology

Stress corrosion cracking is the premature failure of materials below their yield strength, which is sudden and unpredictable, and there are great safety hazards

Most of the existing stress corrosion test devices are constant load test devices that are simply subjected to tensile or bending stress, while the drill pipe and oil casing materials in the oil field are not only subjected to tensile stress, but also to a certain torque, bending moment, Vibration, as well as fluid impact, the simulation test under a single stress condition cannot match the actual working condition very well, which is why the materials that pass the laboratory test still crack in the field

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