Corrosion inhibitor evaluation device and detection method for real-time monitoring of dissolved oxygen and ph under high temperature and high pressure

Abstract

The invention provides an evaluation device and detection method for high temperature and high pressure real-time monitoring of dissolved oxygen and pH value of a corrosion inhibitor. The device includes a high-temperature and high-pressure reaction kettle, a reaction kettle heating insulation device, an electrochemical measurement system, a dissolved oxygen detection system, a pH test system, an external connection gas supply system and a computer; and the external connection gas supply system comprises a high pressure cylinder, a pressure reducing valve, a first guide pipe and a control valve. The invention has the advantage that after filling of the corrosion inhibitor, the device can monitor in situ electrochemical signals of a body simulation solution and continuously monitor the dissolved oxygen content and pH value change of the solution near the material surface, so as to avoid the risk of sampling from the high-temperature and high-pressure reaction kettle in operation for analysis, and the cross contamination on the sample. The invention has great significance to the research on electrochemical behavior of the corrosion inhibitor and the influence of dissolved oxygen content and pH value on the corrosion inhibition effect under high temperature and high pressure environment.

Description

technical field [0001] The invention belongs to the field of corrosion electrochemistry, and relates to an experimental device and a detection method for the corrosion electrochemical behavior of metal materials in a high-temperature and high-pressure corrosion environment, the influence law of oxygen content in solution, the influence law of pH, and the evaluation of corrosion inhibitors. Background technique [0002] In recent years, with the increasing development of oil and gas fields, the research on the in-situ evaluation of corrosion inhibitors under high temperature and high pressure conditions has also attracted much attention. In the process of oil and gas industrial exploitation and transportation, the main corrosive medium involved is CO 2 and other acid gases and water, so to contain CO 2 It is necessary to add corrosion inhibitor to the gas delivery pipeline. However, the research on the effect of adding corrosion inhibitor on the pH value and electrochemical...

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Problems solved by technology

At the same time, data show that O 2 The influence of the concentration on the corrosion rate and the corrosion inhibition efficiency of the corrosion inhibitor is not negligible, O 2 and CO 2 The increase in the corrosion rate caused by the coexistence of the two is far more serious than the simple superposition relationship

However, the international 2 The research on the influence of corrosion inhibitors on corrosion inhibition efficiency is not deep enough, and the introduction of oxygen is often not considered when evaluating corrosion inhibitors, which is very dangerous and inappropriate

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