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

A technology of carbon dioxide and corrosion inhibitors, which is applied in the direction of material analysis by observing the influence of chemical indicators, electrochemical variables of materials, and weighing by removing certain components, so as to achieve excellent protection effects

Inactive Publication Date: 2018-05-08
SOUTHWEST PETROLEUM UNIV
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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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  • Process suitable for rapidly screening corrosion inhibitor of carbon dioxide flooding oil production well
  • Process suitable for rapidly screening corrosion inhibitor of carbon dioxide flooding oil production well
  • Process suitable for rapidly screening corrosion inhibitor of carbon dioxide flooding oil production well

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[0039] The present invention is completed by following process operation: (1) collect the corrosion condition parameter of oil production well; (2) collect the corrosion inhibitor kind that meets corrosion condition, and its serial number; (3) correlate to the corrosion inhibitor collected Capacitance test to screen out corrosion inhibitors with good compatibility with on-site water; (4) use electrochemical corrosion detection methods to further screen out corrosion inhibitors with a corrosion inhibition rate greater than 90%; (5) use static high-temperature autoclave experiments , the corrosion weight loss evaluation experiment was carried out on the corrosion inhibitors screened in the previous step, and the corrosion inhibitors with a corrosion rate ≤ 0.076mm / a were screened out; Evaluation experiments determine the corrosion inhibitors with a corrosion rate of ≤0.076mm / a and their serial numbers. The screening process provided by the present invention can efficiently and qu...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01N21/82G01N27/26G01N5/04
CPCG01N5/04G01N21/82G01N27/26G01N33/00
Inventor 曾德智同航蔡乐乐李皓喻智明彭政德曾凤施太和
Owner SOUTHWEST PETROLEUM UNIV
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