Non-aldehyde acidification corrosion inhibitor and preparation method thereof

Abstract

The invention relates to an aldehyde-free acidification corrosion inhibitor suitable for good solubility in acid liquid, high temperature resistance and high cost performance and a preparation method. The mass percent of each component of the corrosion inhibitor is: 20-50% of acetylenic alcohol ether containing benzene ring; 3-5% of non-ionic surfactant; 40-70% of low-molecular alcohol solvent; 0.5-1.0% of potassium iodide; Wherein, the acetylenic alcohol ether containing a benzene ring has the following general structural formula: wherein R is a group containing a benzene ring. The specific steps are: first react propynyl alcohol with an inorganic base to form a salt, then react with a benzene ring-containing chloride to form an ether, and then compound and dilute with a nonionic surfactant, potassium iodide, and a low-molecular alcohol solvent to obtain an acidifying corrosion inhibitor . The acidification corrosion inhibitor provided by the invention has a simple synthesis method, good high-temperature corrosion inhibition performance, mild reaction conditions, does not contain formaldehyde, can be applied to acid liquid systems such as gelling acid and viscous acid, has good compatibility, and has wider Suitability for acid systems.

Description

technical field [0001] The invention relates to an aldehyde-free acidification corrosion inhibitor suitable for good solubility in acid liquid, high temperature resistance and high cost performance and a preparation method. Background technique [0002] As we all know, in the process of oil and gas exploitation, when oil and gas wells are acidified and acid fractured, the acid liquid has a strong corrosive effect on the oil pipe, and the acid liquid has a strong corrosion effect with the increase of acid liquid concentration, temperature and pressure. upward trend. Selecting the appropriate acid corrosion inhibitor according to the stratum structure and industrial and mining conditions is an important measure to prevent the corrosion of oil pipes and related facilities, improve the effect of acidizing and acid fracturing, and ensure the smooth and safe operation of acidizing and acid fracturing. [0003] With the continuous emergence of domestic high-temperature deep wells ...

AI Technical Summary

Problems solved by technology

At present, the commonly used acidifying corrosion inhibitors in China include quinoline, pyridinium quaternary ammonium salts, ketone aldehyde amine condensates, alkynyloxymethylamine and its quaternary ammonium salts, imidazolines, etc. Among them, quinoline, pyridinium quaternary ammonium Salt corrosion inhibitors do great damage to the formation, and are easy to form deposits in the acid solution after acidizing construction. However, problems such as easy coking, delamination, and poor dispersion and compatibility under high temperature conditions still restrict the field use of acidizing corrosion inhibitors. effect, and may also cause damage to the formation; ketoaldeamines and alkynyloxymethylamines (quaternary ammonium salts) have aldehydes involved in their synthesis, so when used in acid systems such as viscous acid and jelly acid, It is very easy to promote the early cross-linking of acid liquid, causing hidden dangers in construction; imidazoline acidification corrosion inhibitors have poor temperature resistance and are difficult to apply to acidification construction in high-temperature deep wells

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