Process suitable for rapidly screening corrosion inhibitor of carbon dioxide flooding oil production well

Abstract

The invention relates to a process suitable for rapidly screening a corrosion inhibitor of a carbon dioxide flooding oil production well, which belongs to the technical field of oil production engineering. The process comprises the following steps: (1) acquiring corrosion condition parameters of an oil production well; (2) searching for the corrosion inhibitor meeting the requirement, and numbering the corrosion inhibitor; (3) performing the compatibility experiment on the found corrosion inhibitor, and screening the corrosion inhibitor which is good in compatibility with the on-situ water; (4) rapidly screening the corrosion inhibitor with a corrosion inhibition rate greater than 90 percent by adopting an electrochemical corrosion detection method; (5) considering different materials andphase states, evaluating the corrosion inhibitor screened in step (4) by utilizing a static high-temperature high-pressure kettle, and screening the corrosion inhibitor with the corrosion rate smallerthan or equal to 0.076mm / a; (6) simulating an on-situ oil-water mixing flowing working condition, further evaluating the corrosion inhibitor screened in step (5) by utilizing a dynamic high-temperature high-pressure kettle of height-difference pipeline flowing, and determining the corrosion inhibitor with the corrosion rate smaller than or equal to 0.076 mm / a, and a number of the corrosion inhibitor. By adopting the screening process provided by the invention, the corrosion inhibitor meeting the on-situ anticorrosion requirements can be screened efficiently and rapidly.

Description

technical field [0001] The invention provides a process suitable for rapid screening of corrosion inhibitors in carbon dioxide flooding production wells, belonging to the technical field of oil production engineering. Background technique [0002] Currently, CO injection is used in most oilfield sites 2 Oil recovery by means of flooding, while CO 2 The injection of oil will cause corrosion problems of tubing, casing, and sucker rods in production wells. In the process of oil recovery, the main corrosive medium is CO 2 It is very effective to add high-efficiency corrosion inhibitors to oil production wells containing corrosive media such as acid gases and oilfield water. [0003] Aiming at the selection of corrosion inhibitors in downhole pipe string and oil production equipment anticorrosion engineering, domestic and foreign scholars have carried out a lot of research work and achieved many beneficial results. For example, Chinese patent literature discloses "corrosion i...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process suitable for rapid screening of corrosion inhibitors in carbon dioxide flooding production wells for the problem of injection of corrosion inhibitors in production wells

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