High-temperature O2/CO2 corrosion inhibitor for coiled tubing and preparation method of agent B of high-temperature O2/CO2 corrosion inhibitor

Abstract

The invention discloses a high-temperature O2 / CO2 corrosion inhibitor for coiled tubing. The high-temperature O2 / CO2 corrosion inhibitor for the coiled tubing is used by matching an agent A mainly used for deoxidizing and an agent B mainly used for resisting corrosion of carbon dioxide, wherein the agent A is acetone oxime, D-ascorbic acid, sodium sulfite or ferrous sulphate; and the agent B is formed by mixing the components in percentage by weight: 20-30 percent of quaternary pyridine salt, 10-15 percent of mannich base chelate, 3-7 percent of surfactant and 48-67 percent of solvent. The quaternary pyridine salt is obtained by reacting pyridine with benzyl chloride; and the mannich base chelate is obtained by aldehyde ketone amine condensate generated by morpholine, trioxymethylene and dimethylamine through a mannich reaction with metal chloride. The corrosion inhibitor provided by the invention has use temperature up to 170DEG C, is suitable for a water-corrosive medium in which oxygen and carbon dioxde coexist and can be used for effectively inhibiting the corrosion of media such as the oxygen and the carbon dioxide and ensuring safe operation of the coiled tubing in the production process.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a high-temperature anti-O 2 / CO 2 Corrosion inhibitor. Background technique [0002] Coiled tubing operation technology is a practical technology developed this year with broad development prospects. Coiled tubing operation technology has been able to perform paraffin removal, acidizing, water squeezing, well killing, sand flushing, negative pressure perforation, well testing, well logging, well completion, drilling, downhole photography and production on land and offshore oil and gas wells. Pipeline and other operations. Coiled tubing is a key component for the smooth implementation of the above-mentioned operation technologies, and requires a large amount and high quality requirements. However, coiled tubing has harsh service conditions and various failure modes. According to the failure mode and cause analysis of coiled tubing, the main causes of failure are fatigue ...

AI Technical Summary

Problems solved by technology

If coupled with high operating temperature and complex environmental media, coiled tubing is particularly prone to localized corrosion and breakage, thereby affecting production operations

At present, there are many corrosion inhibitors developed for single oxygen corrosion and carbon dioxide corrosion at home and abroad, and there is no corrosion inhibitor specially developed for coiled tubing corrosion

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