Acidizing corrosion inhibitor applicable to high temperature of 120 to 140 DEG C, and preparation and application thereof

Abstract

The invention relates to an acidizing corrosion inhibitor applicable to a high temperature of 120 to 140 DEG C and a preparation method thereof. The acidizing corrosion inhibitor comprises a component A and a component B, wherein the component A is composed of polycyclic aromatic hydrocarbon methyl chloride pyridine quaternary ammonium salt, 3-methyl-1-pentyne-3-ol, triethanolamine, peregal OS-15, hexadecyl trimethyl ammonium chloride, heptadecyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride and methanol, and the component B is composed of sodium iodide, cuprous chloride, bismuth oxide and 1+1 hydrochloric acid; during usage, the component B and the component A are successively added into an acidizing fluid. The acidizing corrosion inhibitor is applied to construction for yield increase in a deep well with a temperature of 120 to 140 DEG C and an oil-gas well acidified by 15 to 28% concentrated hydrochloric acid or mud acid and has excellent corrosion inhibition action on corrosion by concentrated hydrochloric acid and mud acid at a high temperature, a corrosion inhibition rate of no less than 98%, a corrosion rate lower than the standard of an industrial first-grade product, good dispersibility in hydrochloric acid, mud acid and an ethanol solution, good surface activity, little coking and a low freezing point.

Description

technical field [0001] The invention relates to a corrosion inhibitor suitable for high-temperature acidification at 120°C to 140°C and its preparation and application. Background technique [0002] With the continuous deepening of oilfield development, more wells are drilled in newly invested development blocks. During the production of oil wells, it is often necessary to increase the recovery rate through acidification. Acid injection causes corrosion of oil well tubing and downhole metal equipment, resulting in great economic losses. Therefore, in the acidizing of oil wells, especially in high-temperature deep wells and ultra-deep wells with concentrated hydrochloric acid and large acid volume, the important task is to solve the problem of corrosion protection of high-temperature acidizing fluids on oil well pipes and downhole metal equipment. In recent years, acidification has gradually developed into high-temperature deep wells. In the acidification fluid, high tempera...

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Problems solved by technology

In recent years, acidification has gradually developed into high-temperature deep wells. In the acidification fluid, high temperature has seriously damaged the corrosion inhibitor in the acidification fluid, and the corrosion inhibition effect has dropped drastically. The original corrosion inhibitor cannot meet the needs of high-temperature acidification.

At present, the commonly used anti-high temperature acidification corrosion inhibitors in China have the disadvantages of easy coking, delamination, and insufficient stability of dissolution and dispersion at high temperatures, which can not only protect oil well pipes and downhole metal equipment, but also cause formation damage.

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