Non-aldehyde acidification corrosion inhibitor and preparation method thereof

Abstract

The invention relates to a non-aldehyde acidification corrosion inhibitor which is suitable to be used in acid, has good solubility and high cost performance and can resist high temperature and a preparation method thereof. The corrosion inhibitor comprises the following components by weight percent: 20-50% of alkynol ether with a benzene ring, 3-5% of nonionic surfactant, 40-70% of low molecularweight alcoholic solvent and 0.5-1.0% of potassium iodide, wherein the structural general formula of the alkynol ether with a benzene ring is shown as below and R in the formula is a group with a benzene ring. The preparation method comprises the following specific steps: firstly, using propargyl alcohol and inorganic alkali to react and generate a salt; secondly, reacting with a chloride with a benzene ring to generate an ether; and finally mixing with nonionic surfactant, potassium iodide and low molecular weight alcoholic solvent to dilute and obtain the acidification corrosion inhibitor. The acidification corrosion inhibitor provided by the invention has simple synthesis method, good high-temperature corrosion resistance and mild reaction conditions, does not contain formaldehyde, is suitable for the acid systems such as gelling acid and variable-viscosity acid and has good compatibility and wider applicability of 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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