Device for simulating dissolved oxygen corrosion of whole wellbore pipe column of water injection well

Abstract

The invention provides an evaluation device for simulating dissolved oxygen corrosion of a whole wellbore pipe column of a water injection well. The evaluation device comprises a liquid storage vertical pipe, an air injection system, a nitrogen pressurization system, an electric heating system, an aeration circulation system, a dissolved oxygen monitoring system, a corrosion reaction circulation system and an experiment auxiliary control system. According to the corrosion evaluation method, the function relation between the well depth and the experiment time in the water injection process is established, the water injection well whole shaft tubular column dissolved oxygen corrosion rate is calculated through one-time experiment data in combination with the corrosion electrochemical theory, the experiment frequency is greatly reduced, and the experiment time and the experiment cost are remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of integrity and safety of wellbore pipe strings of water injection wells, in particular to a simulation device for simulating dissolved oxygen corrosion of the whole wellbore pipe string of water injection wells. Background technique [0002] Water injection development is the main method to improve oil recovery. Due to the high dissolved oxygen content of injected water, high salinity, large water injection displacement, and high temperature and high pressure underground, after long-term water injection operations, the underground water injection string is severely corroded by dissolved oxygen. As a result, the failure of the pipe string occurs frequently, and the workover period is shortened, which seriously affects the safety of the wellbore of the water injection well and the overall benefit of the water injection development of the oilfield. [0003] In the process of water injection development, the i...

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Problems solved by technology

However, limited by the cost and time of the experiment, the existing experimental devices and methods often only carry out oxygen corrosion simulation for a limited set of experimental parameters selected to obtain the corrosion rate of the pipe string under the temperature and pressure conditions of certain specific well depths.

At the same time, the existing experimental devices and methods are difficult to simulate the dissolved oxygen corrosion behavior in the closed pipe string hundreds to thousands of meters downhole of water injection wells considering the corrosion consumption

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