A kind of pyridine derivative and Mannich base composite high temperature acidification corrosion inhibitor

Abstract

The invention discloses a pyridine derivative and Mannich base compound high-temperature acidizing corrosion inhibitor which comprises the following components in parts by weight: 10-18 parts ofdimethylaminomethyl benzotriazole Mannich base, 10-20 parts of 1,3-bi-chlorinated- pyridine-2-hydroxyl propane, 3-5 parts of urotropin, 5-7 parts of a synergist, 0.5-1 part of a surfactant, 2-3 part of a dispersant, 40-60 parts of a solvent, 3-5 parts of triethanolamine and 5.0-9.0 parts of formic acid. The pyridine derivative and Mannich base compound high-temperature acidizing corrosion inhibitor disclosed by the invention is suitable for 120-160 DEG C and meanwhile has an excellent compound corrosion inhibitor formula which is stable in property, good in corrosion inhibiting property, easyinsite operation and advantageous in cost. The system has the characteristics of being good in compatibility with a field common acidizing additive, a common imidazoline corrosion inhibitor and other types of quaternary ammonium salt corrosion inhibitors, capable of being mixed to use, convenient for construction, high in safety, convenient to transport and store, low in cost and the like.

Description

technical field [0001] The invention relates to the technical field of oil field acidizing construction, in particular to a composite high-temperature acidizing corrosion inhibitor of pyridine derivatives and Mannich bases. 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. 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, which will further deteriorate the working conditions of ...

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Problems solved by technology

[0004] (1) It is difficult to achieve the desired effect with a single component or a single agent in a high-temperature and high-pressure environment. Different types of corrosion inhibitors are compounded to exert their synergistic effect, and a compound acidification corrosion inhibitor with better performance, economical and practical is developed in order to To achieve the purpose of high performance and multi-function;

[0005] (2) In recent years, although there have been many studies on oil well acidification corrosion inhibitors, there are few acidification corrosion inhibitors suitable for high temperature, and the performance is not stable enough

Some high-temperature acidification corrosion inhibitors have the disadvantages of easy coking, delamination, poor dissolution and dispersion, and insufficient stability at high temperatures, which may cause further damage to the formation

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