Aqua regia corrosion inhibitor and preparation method thereof

Abstract

The invention provides an aqua regia corrosion inhibitor and a preparation method thereof. The aqua regia corrosion inhibitor provided by the invention is prepared from the following components in parts by weight: 25-35 parts of 7801 acidification corrosion inhibitor, 20-30 parts of dimethyl formamide, 15-25 parts of alkynol, 5-10 parts of iodide, 3-6 parts of surfactant and 4-7 parts of thiocyanide. The aqua regia corrosion inhibitor has the advantages of low consumption, obvious corrosion inhibition effect and favorable acid solubility; and the acid liquor with the aqua regia corrosion inhibitor is kept clear and transparent, and does not stratify or precipitate. The aqua regia corrosion inhibitor provided by the invention also has the advantages of simple preparation technique, accessible raw materials and favorable solubility in aqua regia, and can be used for acid washing and acidification of aqua regia; and the aqua regia corrosion inhibitor can ensure very low and uniform corrosion speed of metal, and effectively inhibit local corrosion.

Description

technical field [0001] The invention relates to a corrosion inhibitor used for acid washing with aqua regia and acidifying aqua regia in medium and low temperature oil and gas wells. Background technique [0002] Because aqua regia has strong corrosion and oxidation properties, it has wide application prospects in metal pickling and acidizing of oil and gas wells. For example, in pickling, aqua regia can quickly dissolve the thick and dense scale and oil stains on the surface, which greatly improves the efficiency of pickling operations; and in acidizing oil and gas wells, aqua regia can effectively remove organic plugging in oil layers , reduce the viscosity of heavy oil, increase the permeability of the formation, and increase the recovery factor. However, since aqua regia has strong corrosiveness to metals, and various corrosion inhibitors on the market cannot solve the corrosion problem of aqua regia, when pickling with aqua regia, its concentration is often prepared ve...

AI Technical Summary

Problems solved by technology

But, because aqua regia has strong corrosivity to metal, and various corrosion inhibitors on the market all can't solve the corrosion problem of aqua regia, so when carrying out pickling with aqua regia, its concentration is often prepared very low, makes Aqua regia cannot play its due effect. Even so, dilute aqua regia will still cause corrosion to the metal, causing pitting on the steel plate or components after pickling, which affects the appearance; It is injected separately with hydrochloric acid, so that the injected powder nitric acid and hydrochloric acid are mixed at the bottom of the well to form aqua regia. This is not only economically expensive, but also the nitric acid and hydrochloric acid cannot be mixed well under the formation to form aqua regia, making the acidizing effect far inferior to direct Acidification with aqua regia