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A kind of CO2 corrosion inhibitor for oil and gas field gathering pipeline and preparation method

A technology for gathering and transportation pipelines and corrosion inhibitors, which is applied in the field of CO2 corrosion inhibitors and preparations for oil and gas field gathering and transportation pipelines. It can solve problems such as limited corrosion inhibition effects, economic losses, potential safety hazards, and localized corrosion, and achieve excellent corrosion inhibition performance. , good anti-corrosion effect, simple preparation method

Active Publication Date: 2020-07-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When carbon dioxide encounters water, it will form a weak acid, which is very corrosive to carbon steel, leading to serious general corrosion and local corrosion of important equipment such as oil and gas well pipe strings, gathering pipeline steel, etc., resulting in huge economic losses and potential safety hazards
However, for the harsh corrosion environment of gathering and transportation pipelines (such as high Cl- content, high salinity, high temperature), the corrosion inhibition effect of existing corrosion inhibitor products is limited

Method used

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  • A kind of CO2 corrosion inhibitor for oil and gas field gathering pipeline and preparation method
  • A kind of CO2 corrosion inhibitor for oil and gas field gathering pipeline and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. CO used for gathering pipelines in oil and gas fields 2 Preparation of corrosion inhibitor:

[0020] 1) At a temperature of 140-160°C, under normal pressure, oleic acid and diethylenetriamine were mixed and reacted at a molar ratio of 1:1 for 6 hours, and then synthesized at 240-260°C for 12 hours to obtain imidazoline;

[0021] 2) 50 parts by weight of the imidazoline obtained in 1) and 5 parts by weight of benzoic acid were evenly stirred and heated to 60° C., and reacted for 1 hour to form imidazoline-benzoic acid derivatives.

[0022] 3) 55 parts of imidazoline-benzoic acid derivatives, 10 parts by weight of thiourea, 10 parts by weight of water, 8 parts by weight of alkylphenol polyoxyethylene ether OP-10, 2 parts by weight of triethanolamine, 5 parts by weight Parts by weight of Pingpingjia O-25 and 10 parts by weight of ethylene glycol monobutyl ether are fully dissolved at 60°C and mixed evenly to obtain CO2 for oil and gas field gathering pipelines. 2 Corr...

Embodiment 2

[0028] 1. CO used for gathering pipelines in oil and gas fields 2 Preparation of corrosion inhibitor:

[0029] 1) At a temperature of 140-160°C, under normal pressure, mix and react oleic acid and diethylenetriamine at a molar ratio of 1:2 for 4 hours, then react at 200-240°C for 10 hours to obtain imidazoline ;

[0030] 2) 40 parts by weight of the imidazoline obtained in 1) and 4 parts by weight of benzoic acid were evenly stirred and heated to 55° C., and reacted for 1 hour to form imidazoline-benzoic acid derivatives.

[0031] 3) 44 parts by weight of the imidazoline-benzoic acid derivative obtained in 1), 5 parts by weight of thiourea, 15 parts by weight of water, 5 parts by weight of alkylphenol polyoxyethylene ether OP-10, 1 weight part Parts of triethanolamine, 2 parts by weight of Pingpingjia O-25, and 28 parts by weight of ethylene glycol monobutyl ether are fully dissolved and mixed at 50°C to obtain CO 2 Corrosion inhibitor;

[0032] 4) Prepare a simulated liqu...

Embodiment 3

[0037] 1. CO used for gathering pipelines in oil and gas fields 2 Preparation of corrosion inhibitor:

[0038] 1) At a temperature of 140-160°C and under normal pressure, mix and react oleic acid and diethylenetriamine at a molar ratio of 1:3 for 6 hours, then react at 190-220°C for 8 hours to obtain imidazoline ;

[0039] 2) 40 parts by weight of the imidazoline obtained in 1) and 4.5 parts by weight of benzoic acid were evenly stirred and heated to 65° C., and reacted for 1 hour to form imidazoline-benzoic acid derivatives.

[0040] 3) 44.5 parts by weight of the imidazoline-benzoic acid derivative obtained in 1), 8 parts by weight of thiourea, 18 parts by weight of water, 7 parts by weight of alkylphenol polyoxyethylene ether OP-10, 1.5 parts by weight Parts of triethanolamine, 3 parts by weight of Pingpingjia O-25, and 18 parts by weight of ethylene glycol monobutyl ether, mixed and stirred evenly at 60 ° C to obtain CO2 Corrosion inhibitor;

[0041] 4) Prepare a simula...

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Abstract

The invention provides a CO2 corrosion inhibitor for a gathering pipeline of an oil and gas field and a preparation method thereof. The corrosion inhibitor is prepared from the following components inparts by weight: 44 to 55 parts of imidazoline-benzoic acid derivative, 5 to 10 parts of thiourea, 10 to 18 parts of water, 5 to 8 parts of alkylphenol polyoxyethylene ether OP-10, 1 to 2 parts of triethanolamine, 2 to 5 parts of peregal O-25, and 7 to 28 parts of ethylene glycol butyl ether, wherein the imidazoline-benzoic acid derivative is synthesized through imidazoline and benzoic acid reaction. The CO2 corrosion inhibitor for the gathering pipeline of the oil and gas field provided by the invention has a favorable anti-corrosion effect on the gathering pipeline under severe gathering pipeline corrosion environments such as high Cl-content, hypersalinity and high temperature.

Description

technical field [0001] The present invention relates to a CO 2 Corrosion inhibitor and preparation method, especially relate to a kind of CO 2 Corrosion inhibitor and preparation method. Background technique [0002] Carbon dioxide often exists in oil and gas as a component of natural gas or petroleum-associated gas. At the same time, carbon dioxide flooding recovery technology also makes carbon dioxide widely exist in the process of oil and gas development. When carbon dioxide encounters water, it will form a weak acid, which is very corrosive to carbon steel, leading to serious general corrosion and local corrosion of important equipment such as oil and gas well pipe strings and gathering pipeline steel, resulting in huge economic losses and potential safety hazards. [0003] CO control 2 There are many methods of corrosion, and the use of high-performance corrosion inhibitors is one of the effective measures to prevent carbon dioxide corrosion. CO 2 Corrosion inhibit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/10
CPCC23F11/10
Inventor 李循迹常泽亮周理志毛学强李玲杰王福善宋文文袁静徐忠苹孟波李先明赫连建峰熊新民毛仲强
Owner PETROCHINA CO LTD