Oil-water alternating wetting corrosion simulation device and method

Abstract

The invention discloses an oil-water alternating wetting corrosion simulation device and method; the device includes an electrochemical signal processing system, an oil-water alternating wetting simulation electrolytic cell, a rotating disk electrode system, an oil-water interface control system, an aeration system and a temperature control system which is used for heating the oil-water alternating wetting simulation electrolysis cell. The device provided by the invention can realize rapid response of a carbon steel corrosion signal in an oil-water alternating wetting environment, seizes main characteristics of the oil-water two-phase flow environment, and can reveal a corrosion law more comprehensively and deeply.

Description

technical field [0001] The invention relates to the field of oil and gas pipeline corrosion risk assessment, and specifically relates to an oil-water alternate wetting corrosion simulation device and method. Background technique [0002] The evaluation of corrosion risk of oil and gas pipelines is very important to ensure safe production and stable operation. In order to reveal its corrosion law and realize corrosion life prediction, a variety of research methods have been established in this field to simulate or reproduce the on-site corrosion conditions of oil and gas pipelines. According to the functional differences realized by various devices, the main summary is as follows: [0003] (1) Ordinary three-electrode electrochemical test system: This experimental method mainly focuses on the study of the effects of various ions in aqueous solution on the corrosion of carbon steel pipes, such as Cl - , CO 2 and H 2 The concentration or partial pressure of S, with the help...

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Problems solved by technology

This method is widely used to simulate the corrosion behavior of materials in the aqueous medium produced in oilfields, but it is difficult to simulate the characteristics and corrosion laws of the actual oil-water transport medium

[0004] (2) High-temperature and high-temperature autoclave simulation experiment system: This experiment system provides a closed environment for the corrosion medium of oilfield production fluid, which has obvious advantages for studying the corrosion behavior of carbon steel under high pressure and high temperature conditions, but for simulating the corrosion test of oil-water two-phase medium, This method has significant limitations

[0009] (1) The traditional three-electrode electrochemical system requires the solution medium to have high conductivity, so it is difficult to test in oily medium, which limits the understanding of the microscopic corrosion mechanism;

[0010] (2) The corrosion weight loss test method controls the environment of the test piece in the oil-water alternate wetting or oil-water dispersion medium, and can only obtain the final corrosion data or morphology, lacking necessary environmental parameters such as the contact wetting between oil and water and the test piece;

[0011] (3) The corrosion simulation loop device can realize the research on the relationship between oil-water two-phase flow patterns or wetting characteristics and corrosion, but the identification of the oil-water two-phase wetting state is too macroscopic, especially for the oil-water alternate wetting state, it is difficult to achieve quantitative research. It is also difficult to compare the acquisition of corrosion signals with corrosion probes and other technologies with the alternate wetting state of the inner wall of the pipeline;

[0012] (4) The operation and maintenance of a large-scale oil-gas-water multiphase flow corrosion simulation device is difficult and consumes a lot of manpower and material resources, which has also become one of the reasons that restrict the quantitative research on the corrosion law of oil-water two-phase or oil-gas-water three-phase flow

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