Oil-soluble hydrogen sulfide-proof corrosion inhibitor

Abstract

The invention discloses an oil-soluble hydrogen sulfide-proof corrosion inhibitor and relates to the technical field of chemical reagent formulas for the oil fields. The oil-soluble hydrogen sulfide-proof corrosion inhibitor comprises the following components by weight percent: 20-30% of sorbitan monooleate, 10%-20% of nonylphenoxy-acetic acid, 5%-10% of octyl phosphate and 40%-65% of solvent. The oil-soluble hydrogen sulfide-proof corrosion inhibitor is capable of effectively preventing the corrosion of a shaft and a gathering pipeline caused by H2S and sulfides, and has the characteristics of low dosage, low cost, no pollution on the environment and the like, and also has excellent protection effect in the produced liquid; simultaneously, the oil-soluble hydrogen sulfide-proof corrosion inhibitor has good capacity of inhibiting hydrogen embrittlement caused by H2S, and has good compatibility with the conventional chemical reagents used in the oil fields.

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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