Corrosion inhibitor for gas field and preparation method thereof

A corrosion inhibitor, oil and gas field technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of poor film-forming performance, poor high temperature stability, and large temperature influence on corrosion inhibition performance, etc. Achieve the effect of changing solubility and distribution ratio, good anti-corrosion effect and good stability

Active Publication Date: 2014-07-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One is that the monocyclic imidazoline and its derivatives are not stable enough, and they are prone to ring-opening reaction in an alkaline environment with water, and are converted into amides and lose their corrosion inhibition effect; The third is that the film-forming performance is poor under the scouring of high-flow medium, which can only be used for a single gas-phase or liquid-phase corrosive medium, and cannot satisfy the corrosive medium with gas-liquid two-phase coexistence

Method used

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  • Corrosion inhibitor for gas field and preparation method thereof
  • Corrosion inhibitor for gas field and preparation method thereof
  • Corrosion inhibitor for gas field and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Preparation of 2-octyl-1,10-phenanthroline[5,6]-1-hydroimidazole:

[0048] In a reactor with a stirring and condensing device, 1,10-phenanthroline-5,6-dione, nonanal and ammonium acetate were dissolved in an appropriate amount of ethanol at a molar ratio of 1:1:5.5, and Under the protection of nitrogen, heat up to 80°C and reflux, react for 4 hours, cool to room temperature, add an appropriate amount of water to the system, filter the precipitated solid with suction, and dry to obtain the phenanthroline imidazole intermediate 2-octyl-1,10-phenanthrene Rolin[5,6]-1-hydroimidazole, represented by "C8-PIM".

Embodiment 2

[0050] Preparation of 2-decyl-1,10-phenanthroline[5,6]o-1-hydroimidazole:

[0051] In a reactor with a stirring and condensing device, undecanal, 1,10-phenanthroline-5,6-dione, and ammonium acetate were dissolved in an appropriate amount of ethanol at a molar ratio of 1:1:7, under nitrogen Under protection, heat up to 78°C and reflux for 6 hours, cool to room temperature, add an appropriate amount of water to the system, filter the precipitated solid with suction, and dry to obtain the phenanthroline imidazole intermediate 2-decyl-1,10-phenanthroline [5,6]-1-hydroimidazole, represented by "C10-PIM".

Embodiment 3

[0053] Preparation of 2-undecyl-1,10-phenanthroline[5,6]-1-hydroimidazole:

[0054] In a reactor with a stirring and condensing device, lauric aldehyde, 1,10-phenanthroline-5,6-dione and ammonium acetate were dissolved in an appropriate amount of ethanol at a molar ratio of 1:1:9, under nitrogen protection Lower the temperature to 82°C and reflux for 2 hours, cool to room temperature, add an appropriate amount of water to the system, filter the precipitated solid with suction, and dry to obtain the phenanthroline imidazole intermediate 2-undecyl-1,10-phenanthro Phylo[5,6]-1-hydroimidazole, represented by "C11-PIM".

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PUM

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Abstract

The invention discloses a corrosion inhibitor for a gas field and a preparation method thereof, belonging to the fields of corrosion and protection. The corrosion inhibitor is composed of the following components in percentage by weight: 20-75% of phenanthrolinoimidazole quaternary ammonium salt, 1-5% of nonionic surfactant and 20-75 of solvent. By using the phenanthrolinoimidazole quaternary ammonium salt as the main component of the corrosion inhibitor, the corrosion inhibitor has favorable stability and can well form a film on the metal surface. The phenanthrolinoimidazole is quaterized to different degrees, thereby improving the solubility of the phenanthrolinoimidazole in the water solution and changing the solubility and distribution ratio of the corrosion inhibitor molecules in an oil-gas-water multiphase flow.

Description

technical field [0001] The invention relates to the field of corrosion and protection, in particular to an imidazole quaternary ammonium salt corrosion inhibitor used in oil and gas fields and a preparation method thereof. Background technique [0002] During the exploitation, storage and transportation of oil and gas fields, metal equipment and pipelines are often subjected to severe corrosion. Corrosion not only causes huge economic losses, but also causes serious safety accidents, which has become a problem that plagues the development of the oil and gas industry. Rational use of corrosion inhibitors has become an economical and effective protection technology to solve this problem. [0003] The main types of corrosion inhibitors used in oil and gas fields include organic amines, amides, imidazolines, rosin amines, heterocyclic compounds and organic sulfurs, among which imidazolines are used in the largest amount. The molecular structure of imidazoline contains a nitrog...

Claims

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Application Information

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IPC IPC(8): C09K8/54C23F11/14
CPCC09K8/54C23F11/149
Inventor 魏斌王红艳李发根赵雪会白真权
Owner BC P INC CHINA NAT PETROLEUM CORP
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