Low-temperature acidification corrosion inhibitor and preparation method thereof

Abstract

The invention relates to a low-temperature acidification corrosion inhibitor which is composed of 10-50 parts by weight of alkynol, 10-50 parts by weight of quaternary ammonium salt and 5-10 parts by weight of heterocyclic compound, wherein the alkynol is selected from butyn alcohol, hexynol, popargyl alcohol, 1,4-butyne glycol, dormison, methyl butynol, butyne glycol, and 4-trimethylsilyl isocyanate-3-butyn alcohol; the quaternary ammonium is selected from dimethyl benzyl ammonium chloride, rosin modified oleic acid group imidazoline quaternary ammonium salt, quaternary ammonium tribenzal-imidazoline, (4-vinyl)-quinoline benzyl quinoline chloride quaternary ammonium salt, (4-vinyl)-quinoline benzyl pyridine chloride quaternary ammonium salt, epoxypropane group quinoline chloride, epoxypropane group pyridine chloride, allyl quinoline chloride and allyl pyridine chloride; the heterocyclic compound is selected from bromination hexadecy pyridine, cetylpyridine chloride, chlorinated dodecyl pyridine and bromination myristyl lycine pyridine. The invention also relates to a preparation method of the low-temperature acidification corrosion inhibitor.

Description

technical field [0001] The invention relates to an acidification corrosion inhibitor and a preparation method thereof, in particular to a low-temperature acidification corrosion inhibitor and a preparation method thereof. Background technique [0002] Acidizing operation is already one of the indispensable production stimulation technologies in the oilfield production process. Due to the corrosion of surface equipment and downhole pipe strings by acid liquid, it is necessary to use corrosion inhibitors in acid liquid to reduce or eliminate corrosion. The low-temperature (greater than 60°C but less than 90°C) acidification corrosion inhibitors currently used in oil fields are usually nitrogen-containing compounds, sulfur-containing compounds, acetylenic compounds, aldehydes, ketones, lipophilic compounds, surfactants, etc.; they exist Many deficiencies, including poor compatibility with acid liquid and various additives, such as some corrosion inhibitors forming flocs in acid...

AI Technical Summary

Problems solved by technology

The low-temperature (greater than 60°C but less than 90°C) acidification corrosion inhibitors currently used in oil fields are usually nitrogen-containing compounds, sulfur-containing compounds, acetylenic compounds, aldehydes, ketones, lipophilic compounds, surfactants, etc.; they exist Many deficiencies, including poor compatibility with acid liquid and various additives, such as some corrosion inhibitors forming flocs in acid liquid, or even precipitation; poor corrosion inhibition effect on working pipe strings, such as some corrosion inhibitors in the work The film formed on the pipe string is not strong enough, and the erosion resistance is weak; the production cost of corrosion inhibitor is high, such as the addition of some corrosion inhibitors exceeds 2%, resulting in high cost of acid system, etc.

These deficiencies limit the large-scale use and promotion of these low-temperature corrosion inhibitors in oil fields

Images