Nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor and preparation method thereof

Abstract

The invention discloses a nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor and a preparation method thereof. The nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor comprises the following components in percentage by weight: component 1, propargyl alcohol, formaldehyde, urotropine, potassium iodide, antimonous oxide, antimony butter, surfactant and solvent in the ratio of (1-50) : (0-25) : (1-25) : (0-10) :(0-10) : (0-20) : (6-25) : (15-70), wherein the component 1 is selected from one or more of chlorinated N-benzyl-R-pyridine quaternary ammonium salt or chlorinated N-benzyl-R-quinoline quaternary ammonium salt. The nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor has the advantages of small addition amount, low cost, stable and uniform dispersion in acidic liquid, low corrosion speed, capability of resisting high temperature of over 160 DEG C and excellent performance. 0.5-2.5 percent of nitrogenous heterocyclic quaternary ammonium salt acidizing corrosion inhibitor disclosed by the invention is added into the acidic liquid, so that the corrosion speed is far lower than national primary standard.

Description

technical field [0001] The invention belongs to the technical field of metal anticorrosion, and relates to a nitrogen-containing heterocyclic quaternary ammonium hydrochloride corrosion inhibitor and a preparation method thereof. Background technique [0002] Oil well acidizing process, also known as acid treatment process, refers to the use of mechanical methods to inject a certain amount of acid liquid from the surface through the oil well into the formation, because the acid liquid can dissolve the blocking substances in the formation near the bottom of the well, such as mud plugs, corrosion Certain components in formation rocks enlarge and communicate formation pores and fractures, increase formation crude oil flow channels, and reduce formation crude oil flow resistance, thereby achieving the purpose of increasing production. However, the acid liquid is highly corrosive to metal pipeline equipment and downhole tubing strings. Accidents such as damage to aboveground acid...

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Problems solved by technology

The high-temperature corrosion inhibitors commonly used at home and abroad are prone to coking, delamination, and insufficient stability of dissolution and dispersion in high-temperature concentrated acid (above 160 ° C, 20% HCL) environments, and the addition of large amounts of corrosion inhibitors is high and costly. There are disadvantages such as high corrosion rate and poor corrosion inhibition efficiency. In addition, deposits may be formed in the formation, causing formation damage.

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