Gas-liquid two-phase palmitic acid-based imidazoline corrosion inhibitor and its preparation and use method

Abstract

The invention belongs to the field of chemical technology of oil and gas fields and discloses a gas-liquid bi-phase palmitic acid-based imidazoline corrosion inhibitor. The corrosion inhibitor comprises a main agent, a plurality of auxiliary agents and a solvent, wherein the main agent is an imidazoline derivative prepared from palmitic acid, polyethylene polyamine and an azeotropic agent; the auxiliary agents include isopropanol, aminoethyl acid and diglycolamine; and ethanol is selected as the solvent. Based on percentage by weight, the ratio of the components is as follows: 22%-25% of palmitic acid, 10%-12% of polyethylene polyamine, 10%-15% of azeotropic agent, 8%-12% of isopropanol, 10% of aminoethyl acid, 5% of diglycolamine and 21%-35% of solvent. The palmitic acid-based corrosion inhibitor belongs to the oil-soluble water dispersible type, is stable and easily soluble, good in compatibility with other chemical agents, strong in adsorptivity on the metal surface, small in usage amount, capable of effectively inhibiting corrosion of H2S, CO2 and salinity brine to an oil casing and suitable for oil and gas production, gathering and transportation and has great economic benefits and social benefits, and formed films are compact.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field chemistry, and specifically relates to a gas-liquid two-phase palmitic acid-based imidazoline corrosion inhibitor, and a method for preparing and using the phyloline corrosion inhibitor, which is mainly used for inhibiting H in gas wells. 2 S, CO 2 , Salinity corrosion environment for production tubing, casing corrosion. Background technique [0002] Hydrogen sulfide (H 2 S), carbon dioxide (CO 2 ) Corrosion under the combined action. These two acidic gases have a strong corrosive effect on downhole oil casing and other steel materials in a humid environment, mainly manifested in electrochemical corrosion, stress corrosion cracking, and hydrogen bubbling. Corrosion types include uniform corrosion, local corrosion, pitting corrosion, crevice corrosion, etc. Among them, electrochemical corrosion is an important cause of oil casing damage. [0003] With the development of gas fields, w...

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Problems solved by technology

For the liquid phase corrosion at the bottom of the pipeline, adding a liquid phase corrosion inhibitor with better effect can achieve good results; but for the gas phase, it is difficult for the traditional single liquid phase corrosion inhibitor to achieve the purpose of anticorrosion, and it is difficult to inhibit the corrosion of oil and gas pipelines. Corrosion at the top of the oil and gas pipeline, and it is difficult to inhibit the liquid phase corrosion at the bottom of the oil and gas pipeline with a single gas phase corrosion inhibitor

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