Compound corrosion inhibitor with corrosion inhibiting effect as well as preparation method and application of compound corrosion inhibitor

Abstract

The invention provides a compound corrosion inhibitor with a corrosion inhibiting effect as well as a preparation method and an application of the compound corrosion inhibitor. In terms of total amount of 100%, the compound corrosion inhibitor is prepared from components as follows: 10wt.%-50wt.% of tall oil acid imidazoline quaternary ammonium salt, 10wt.%-30wt.% of a surfactant, 2wt.%-5wt.% of thiourea dioxide, 2wt.%-6wt.% of pyrophosphate, 10wt.%-70wt.% of an organic solvent and 0-30wt.% of water. The corrosion inhibitor is prepared from organic components and inorganic components by compounding, the organic components and the inorganic components achieve a synergistic corrosion inhibition effect, and corrosion of CO2 and H2S can be effectively inhibited; the compound corrosion inhibitor is good in water solubility, free of emulsification tendency and non-toxic, and can be used for preventing and treating corrosion of CO2 and H2S in an oil field system; the corrosion inhibitor has the advantages of small addition amount, low cost and small environmental harm.

Description

technical field [0001] The present invention relates to corrosion inhibitors and applications thereof, in particular to inhibiting CO 2 and / or H 2 The invention relates to a composite corrosion inhibitor for S corrosion and its preparation method and application, belonging to the technical field of oil field chemistry. Background technique [0002] CO in the production of oil and gas wells 2 and H 2 S and other oil field semi-generated gases will cause different degrees of corrosion to metals. CO 2 Corrosion is mainly a kind of hydromechanical chemical corrosion, and the shear stress of the pipe wall caused by the fluid can cause the corrosion product FeCO 3 The thinning and cracking of the film makes the metal partially exposed and forms localized corrosion under the action of the "big cathode-small anode" galvanic couple. h 2 In addition to causing electrochemical corrosion, S also has metal mechanical and chemical corrosion, namely HIC and SSC, etc., H 2 Hydrogen ...

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Problems solved by technology

[0004] Although the prior art has multiple types of corrosion inhibitors, factors such as poor corrosion inhibition effect, poor water solubility, emulsification tendency, toxicity, and easy pollution to the environment have affected the popularization and application of corrosion inhibitors. Therefore, in this field It is urgent to develop a new type of corrosion inhibitor with excellent corrosion inhibition effect, good water solubility, no emulsification tendency, non-toxic, and no environmental pollution

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