Water-soluble corrosion inhibitor for resisting hydrogen sulfide

Abstract

The invention discloses a water-soluble corrosion inhibitor for resisting hydrogen sulfide, and relates to the technical field of chemical agent formulations for an oil field. The water-soluble corrosion inhibitor comprises the following materials in mass concentration: 20%-30% of heptadecyl ethoxyl imidazoline, 10%-20% of sodium benzoate, 5%-10% of zinc vitriol, 5%-10% of sodium molybdate and 30%-60% of water. The water-soluble corrosion inhibitor disclosed by the invention has the characteristics of small usage amount, low cost, no environment pollution, good protection effect in a water phase, good inhibition capacity on hydrogen brittleness caused by H2S, very good compatibility with the conventional chemical agent for the oil field, and the like.

Description

[0001] technical field [0002] The invention relates to the technical field of chemical formulations for oilfields, and is mainly used for slowing down the corrosion of oil well bores caused by high-salinity oilfield production water containing hydrogen sulfide and sulfide. Background technique [0003] Some blocks in Changqing Oilfield have high hydrogen sulfide content. Hydrogen sulfide not only causes sudden sulfide stress cracking of metal materials, causing huge economic losses, but also causes environmental pollution due to the toxicity of hydrogen sulfide, directly threatening personal safety. Therefore, in view of the corrosion characteristics and problems of hydrogen sulfide in Changqing Oil and Gas Field, it is urgent to develop a series of high-efficiency sulfur-resistant corrosion inhibitors suitable for the current situation of Changqing Oil and Gas Field to solve the corrosion problems of oil and gas wells and gathering and transportation systems in Changqing O...

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Problems solved by technology

[0008] 3. The corrosion inhibitors of the above invention are only suitable for low-temperature corrosion environments, and are prone to failure when used in high-temperature (≥120°C) corrosion environments in oil and gas wells;

[0009] 4. The above-mentioned patent documents are applied to the wellbore of oil wells. During its actual use, its corrosion inhibition performance in sulfur-containing corrosive media is not ideal, and the corrosion inhibition rate is low

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