Simulation test device and method of evaluating stress corrosion cracking resistance of well logging steel wire

Abstract

The invention discloses a simulation test device and method of evaluating stress corrosion cracking resistance of a well logging steel wire. The simulation test device comprises a fixed loading system, a corrosion system, a sample clamping system and a computer processing system, wherein the fixed loading system comprises a microcomputer control electronic universal tester, an adjusting bracket, upper and lower cardan shafts and upper and lower pull rods; the corrosion system comprises a corrosion container, an inlet / outlet gas pipe, a gas inlet adjusting valve and a pressure gauge; the sampleclamping system comprises upper and lower fixtures and upper and lower sealers. A loading test is carried out by enabling the upper and lower fixtures with a to-be-tested steel wire to pass through the upper and lower sealers of the corrosion container and connecting the upper and lower fixtures to the upper and lower pull rods, then prestressing the to-be-tested steel wire, configuring a simulation corrosion environment, adjusting the test conditions and setting the test load. The device is easy and convenient to mount, has the functions of temperature control and pressure control, can simulate the high-temperature and high-pressure environment in the well, and ensures the accuracy and authenticity of research on the stress corrosion cracking resistance.

Description

Technical field [0001] The invention belongs to the field of performance testing of petroleum logging materials, in particular to a simulation test device and method for evaluating the stress corrosion cracking resistance of logging steel wires. Background technique [0002] In the process of exploration, drilling and exploitation in the oil and gas industry, it is necessary to use a variety of logging tools to measure and monitor various technical parameters in oil and gas wells. Logging wire is an important load-bearing component for hoisting logging tools. Root work has high requirements on the performance of materials. In recent years, with the exploration and development of ultra-deep, ultra-high temperature, ultra-high corrosion and harsh environment oil and gas wells, logging steel wires are often affected by H in downhole operations. 2 S, CO 2 , Cl - Corrosion of other strong corrosive media is prone to corrosion damage, which seriously threatens the safety of logging ope...

AI Technical Summary

Problems solved by technology

However, under normal circumstances, the logging steel wire does not fully bear the permanent / constant tensile load during the downhole operation. For example, during the mechanical wax removal operation, the steel wire will undergo force changes with the friction between the scraper and the well wall; the logging steel wire When the underground is blocked, the pulling speed of the drawworks will cause the steel wire load and strain rate to change, etc.

In addition, the bearing capacity of the logging steel wire is also affected by the action of the corrosive medium, but the permanent / constant axial loading method adopted by the existing test equipment cannot simulate the variable load state

[0005] (2) The commonly used specification of logging steel wire is Φ1.8~3.2mm, and the diameter of the steel wire is too small, which does not meet the processing size requirements of the above-mentioned standard for the sample

If the full-size logging steel wire is directly clamped, the clamping part is likely to cause stress concentration and fracture, and accurate test data cannot be obtained. The sealing ring of the existing stress corrosion cracking test container is also difficult to effectively seal the small-size steel wire sample.

[0006] (3) The service temperature of the logging steel wire will change with the operating depth. Most of the existing equipment is tested at room temperature or can only set constant temperature parameters, which is difficult to match with the actual working conditions

[0007] The materials of well logging wires are special, especially the high-performance stainless steel wires have been monopolized by foreign countries for a long time and have not yet been fully domesticated. There is no unified industry standard for logging steel wire

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