A quinoline derivative and a novel Mannich base composite acidifying corrosion inhibitor

Abstract

The invention discloses a compound acidifying corrosion inhibitor containing a quinoline derivative and novel mannich base. The compound acidifying corrosion inhibitor is prepared from the following components in parts by weight: 12 to 20 parts of a main agent A of the corrosion inhibitor and 12 to 20 parts of a main agent B of the corrosion inhibitor, wherein the main agent A of the corrosion inhibitor is generated through a reaction of benzotriazole, benzaldehyde and piperidine; the main agent B of the corrosion inhibitor is generated through a reaction of 3-aminoquinoline and benzyl chloride; and in addition, the compound acidifying corrosion inhibitor further comprises propargyl alcohol, heavy alkylbenzene sulfonate, potassium iodide, cuprous chloride, peregal O, formic acid, acetanilide, triethanolamine and a solvent. The acidifying corrosion inhibitor has the advantages of good slow-release effect, easiness in storage and transportation, high stability and environmental friendliness; in addition, the slow-release property of the acidifying corrosion inhibitor can be maintained for 3 days or longer under the condition that the temperature is 160 DEG C, so that the acidifying construction quality under the condition that the temperature is 160 DEG C is effectively improved; and in addition, the acidifying corrosion inhibitor has higher compatibility with a common oilfield acidification system.

Description

technical field [0001] The invention relates to the technical field of oil field acidizing construction, in particular to a composite acidizing corrosion inhibitor of quinoline derivatives and a novel Mannich base. Background technique [0002] In the acidizing of oil and gas wells, especially in high-temperature deep wells with concentrated hydrochloric acid or a large amount of acid acidizing, the primary task is to solve the problem of corrosion of oil well casing equipment by high-temperature acidizing fluid. 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. In addition, the hydrogen gas produced after the reaction between metal and acid will cause hydrogen embrittlement corrosion of metal equipment, and will also bring out a large amount of acid gas to form acid mist. Therefore, targeted corrosion inhibition measures must be taken for metal corr...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a compound of quinoline derivatives and novel Mannich base that overcomes the disadvantages of easy coking, poor solubility and dispersion, and insufficient stability of corrosion inhibitors existing in the acidification construction process under high temperature conditions in the prior art Acidification corrosion inhibitor

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