Corrosion inhibitor evaluation method for deepwater natural gas pipeline under high gas phase flow rate working condition

Abstract

The invention discloses a corrosion inhibitor evaluation method for a deepwater natural gas pipeline under a high gas phase flow rate working condition. The method comprises the following steps: investigating a service environment of the deepwater natural gas pipeline; calculating the shearing force of the fluid on the inner wall surface of the submarine pipeline; selecting a corrosion inhibition efficiency evaluation test method; calculating test parameters of the corrosion inhibition efficiency evaluation test method; performing multiple groups of corrosion inhibitor evaluation experiments under different wall surface shear forces and different corrosion inhibitor filling concentrations; drawing a corrosion inhibitor critical filling concentration map; and determining the filling concentration of the corrosion inhibitor under different working conditions. The method for evaluating the corrosion inhibitor of the deepwater natural gas pipeline under the working condition of the high gas phase flow velocity is accurate and effective, scientific and accurate in formulation, beneficial to screening of the efficient corrosion inhibitor and determination of the accurate, economical and safe corrosion inhibitor filling concentration, has important significance, and is one of important links for deepwater oil and gas development and safe conveying guarantee.

Description

technical field [0001] The invention relates to the technical field of deep-water natural gas pipeline transportation, in particular to a corrosion inhibitor evaluation method for deep-water natural gas pipelines under the condition of high gas phase flow velocity. Background technique [0002] In recent years, the demand for natural gas has grown strongly. The development of marine natural gas resources, especially the development of deep sea natural gas resources, has become an inevitable trend of energy development today. my country's deep-sea natural gas field CO 2 There are many oil and gas blocks with high oil and gas content, and the failure of submarine pipeline leakage due to oil and gas medium corrosion occurs frequently during the mining process, and each occurrence often causes catastrophic consequences such as major economic losses, casualties, and environmental pollution. It has gradually become one of the factors restricting the development of deep-sea natur...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a corrosion inhibitor evaluation method for deep-water natural gas pipelines under high gas phase flow rate conditions, to solve the problem that the evaluation of the anticorrosion effect of the existing corrosion inhibitors is inaccurate and cannot form an effective evaluation method question

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