Compound high-temperature acidizing corrosion inhibitor based on pyridine quaternary ammonium salt

Abstract

The invention discloses a compound high-temperature acidizing corrosion inhibitor based on pyridine quaternary ammonium salt. The compound high-temperature acidizing corrosion inhibitor is prepared from components in parts by weight as follows: 20-30 parts of a corrosion inhibitor main agent, 2.0-2.5 parts of a synergist, 0.2-1.0 part of a dispersing agent, 0.5-1.0 part of propargyl alcohol, 0.2-1 part of an emulsifier, 2.5-6.0 parts of triethanolamine, 0.8-1.0 part of a surfactant and 60-70 parts of a solvent, wherein the corrosion inhibitor main agent is the pyridine quaternary ammonium salt prepared from 3-picoline and benzyl chloride through a reaction; the synergist is a mixture of potassium iodide, antimonous oxide and antimony trichloride in a weight ratio being (2-3):(1-2):(1-2). According to the compound high-temperature acidizing corrosion inhibitor based on the pyridine quaternary ammonium salt, the requirement of oilfield acidizing construction at the temperature of 120-160 DEG C is met, a corrosion inhibitor formula which is stable in property and good in corrosion inhibition performance, facilitates site construction and has cost advantage is provided, and the corrosion inhibitor has the characteristics that compatibility with commonly used acidizing additives in site, commonly used imidazoline corrosion inhibitors and other types of quaternary ammonium salt corrosion inhibitors is good, mixed use can be realized, construction is convenient and highly safe, no pollution is produced, transportation and storage are convenient, the cost is low and the like.

Description

technical field [0001] The invention relates to the technical field of oil field acidizing construction operations, in particular to a composite high-temperature acidizing corrosion inhibitor based on pyridine quaternary ammonium salts. Background technique [0002] In the acidizing of oil and gas wells, especially in high-temperature deep and ultra-deep wells with concentrated hydrochloric acid or a large amount of acid acidizing, the primary task is to solve the corrosion problem of high-temperature acidizing fluid on oil well casing equipment. In the pickling process, especially the pickling solution prepared with inorganic acid, it will cause a certain degree of corrosion and damage to metal equipment and materials. [0003] With the development of drilling technology and the progress of oil recovery technology, a large number of deep wells and ultra-deep wells have been put into development, and the number of acidizing measures has increased year by year, and higher req...

AI Technical Summary

Problems solved by technology

In the past, when high-temperature deep wells in some oil fields were acidified with concentrated hydrochloric acid, accidents such as downhole tubing tripping often occurred because there was no good corrosion inhibitor for corrosion protection.

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