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Water injected pitting-corrosion composite inhibitor and application thereof

A compound inhibitor and inhibitor technology, which is applied in wellbore/well components, earthwork drilling and production, etc., can solve the problem of unsatisfactory pitting corrosion inhibition effect, and achieve the effect of corrosion inhibition

Active Publication Date: 2013-02-27
中海油(天津)油田化工有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic oilfields usually use organic phosphines, polyol phosphates, organic amines or imidazoline corrosion inhibitors to inhibit water injection corrosion, mainly for those containing sewage and the inhibitory effect on pitting corrosion is not ideal

Method used

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  • Water injected pitting-corrosion composite inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Agent A consists of 30% lauric acid imidazoline quaternary ammonium salt, 10% naphthenic acid amide, 1% fatty alcohol polyoxyethylene ether, 8% dodecyl dimethyl benzyl quaternary ammonium salt, 4% thiourea, 8% % potassium benzoate, 15% isopropanol, 24% ethanol; agent B is dodecyl trimethyl quaternary ammonium salt.

Embodiment 2

[0022] Agent A consists of 25% salicylic acid imidazoline quaternary ammonium salt, 5% oleic acid amide, 5% alkylphenol polyoxyethylene ether, 10% fatty acid polyoxyethylene ether, 1% hexadecyldimethylbenzyl quaternary Ammonium salt, 3% thiourea, 1% benzoic acid, 20% methanol, 30% ethanol; composition; agent B is dodecyl dimethyl diquaternary ammonium salt.

Embodiment 3

[0024] Agent A consists of 20% imidazoline quaternary ammonium benzoate, 15% lauric acid amide, 10% fatty amine polyoxyethylene ether, 1% dodecyl trimethyl quaternary ammonium salt, 3% thiourea, 2% benzoic acid , 20% methanol, 10% isopropanol, 19% methanol; agent B is dodecyl tributyl quaternary phosphine salt.

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Abstract

The invention relates to a water injected pitting-corrosion composite inhibitor and an application thereof. The composite inhibitor is composed of agent A and agent B, wherein the agent A comprises 10%-30% of imidazoline quaternary ammonium salts, 5%-15% of organic acid amide, 1%-15% of nonionic surfactants, 1%-8% of long-chain alkyl quaternary ammonium salts, 2%-6% of sulfocompounds, 1%-8% of aromatic acid or aromatic acid salts and the balance solvents; and the agent B is a cationic surfactant. At the beginning of the use, the concentration of the agent A in water injection is 100-300mg / L and is reduced to 30-60mg / L after uniform corrosion rate and the pitting corrosion rate are stabilized for at least 6 hours, then the agent B is injected, and the concentration of the agent B in the water injection is controlled to be 10-40mg / L.

Description

technical field [0001] The invention belongs to the technical field of chemical anticorrosion, and relates to a pitting corrosion composite inhibitor, in particular to a offshore oilfield water injection pitting corrosion composite inhibitor and its application. Background technique [0002] With the continuous exploitation of oil fields, the water content continues to rise, and the corrosion problem is becoming more and more prominent. The corrosion forms of production facilities mainly include general corrosion and local corrosion, but general corrosion generally does not cause sudden accidents, and is easy to measure and relatively easy to control compared with local corrosion. Localized corrosion is the corrosion that occurs in some areas of the metal surface, and its characteristic is that the anode reaction and cathode reaction in the corrosion cell can occur in different parts, and secondary corrosion products can be formed in the third place. Localized corrosion can...

Claims

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Application Information

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IPC IPC(8): C09K8/54
Inventor 陆原郭海军邢四骏张勇张颖孙吉星
Owner 中海油(天津)油田化工有限公司
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