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A water injection corrosion inhibitor for corrosion control of sewage in oilfield production water injection system

A technology of water injection system and corrosion control, which is applied to the drilling composition, wellbore/well components, earthwork drilling and mining, etc. It can solve the problems of large changes in salinity, reduced protection effect, and complex sewage components, etc., to achieve High input-output ratio, good chemical effect, and good corrosion inhibition effect

Active Publication Date: 2017-05-17
XIAN HUANUO ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are a large number of corrosion inhibitors on the market, but due to the complex composition of the sewage in the oilfield water injection system, the degree of salinity varies greatly, and the content of various ions in the sewage varies greatly, especially the content of bicarbonate, carbon dioxide, and sulfide in the sewage. The hydrogen content varies greatly, and with the progress of the production process, the properties of the sewage in the oilfield water injection system will change greatly. The corrosion inhibitors on the market cannot meet the needs of the changes in the properties of the sewage in the oilfield water injection system, and the corrosion inhibition rate decreases. As the protection effect declines, continuous follow-up testing and evaluation are required, and water injection corrosion inhibitors are regularly screened. Therefore, it is necessary to develop a water injection corrosion inhibitor with good effect and wide adaptability to meet the large differences in the sewage properties of the water injection system in the oilfield production process. changing needs

Method used

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  • A water injection corrosion inhibitor for corrosion control of sewage in oilfield production water injection system
  • A water injection corrosion inhibitor for corrosion control of sewage in oilfield production water injection system
  • A water injection corrosion inhibitor for corrosion control of sewage in oilfield production water injection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Formula composition: based on 100% of composition mass, quinoline benzyl chloride quaternary ammonium salt 12%, alcohol 7%, organic urea 5%, urotropine 5%, potassium iodide 0.8%, fatty amine polyoxyethylene ether surface active Agent 5%, Gemini quaternary ammonium salt 6%, polyvinyl alcohol 6%, and the rest is water.

[0024] Wherein the synthesis process of quinoline benzyl chloride quaternary ammonium salt: add quinoline in the reaction kettle, add glycerol, then drop benzyl chloride, quinoline: benzyl chloride: glycerol (molar ratio)=1:1.002 : 0.4; after the dropwise addition, the temperature was slowly raised to 140° C., reacted for 4 hours, cooled to obtain quinoline benzyl ammonium chloride quaternary ammonium salt.

[0025] The alcohol ratio is methanol:glycerol (mass ratio)=6:4.

[0026] The ratio of organic urea is thiourea:rhodin (mass ratio)=7:3.

[0027] The ratio of fatty amine polyoxyethylene ether surfactant is AC-1810:AC-1830:AC-1860 (mass ratio)=5:3:2...

Embodiment 2

[0033] Formula composition: based on 100% of composition mass, quinoline benzyl chloride quaternary ammonium salt 15%, alcohol 9%, organic urea 5%, urotropine 4%, potassium iodide 0.5%, fatty amine polyoxyethylene ether surface active Agent 4%, Gemini quaternary ammonium salt 5%, polyvinyl alcohol 8%, and the rest is water.

[0034] Wherein the synthetic technique of quinoline benzyl chloride quaternary ammonium salt is with example 1.

[0035] The alcohol ratio is methanol:glycerol (mass ratio)=6:4.

[0036] The ratio of organic urea is thiourea:rhodin (mass ratio)=7:3.

[0037] The ratio of fatty amine polyoxyethylene ether surfactant is AC-1810:AC-1830:AC-1860 (mass ratio)=5:3:2.

[0038] The ratio of the Gemini quaternary ammonium salt is 31117:31004:31149 (mass ratio)=3:2:5.

[0039] The ratio of polyvinyl alcohol is PVA1799::PVA0599:PVA2088=1:1:2.

[0040] The corrosion inhibition effect and corrosion control effect test of the formula:

[0041]

Embodiment 3

[0043] Formula composition: based on 100% of composition mass, quinoline benzyl chloride quaternary ammonium salt 8%, alcohol 4%, organic urea 8%, urotropine 10%, potassium iodide 1%, fatty amine polyoxyethylene ether surface active Agent 10%, Gemini quaternary ammonium salt 5%, polyvinyl alcohol 3%, and the rest is water.

[0044] Wherein the synthetic technique of quinoline benzyl chloride quaternary ammonium salt is with example 1.

[0045] The alcohol ratio is methanol:glycerol (mass ratio)=6:4.

[0046] The ratio of organic urea is thiourea:rhodin (mass ratio)=7:3.

[0047] The ratio of fatty amine polyoxyethylene ether surfactant is AC-1810:AC-1830:AC-1860 (mass ratio)=5:3:2.

[0048] The ratio of the Gemini quaternary ammonium salt is 31117:31004:31149 (mass ratio)=3:2:5.

[0049] The ratio of polyvinyl alcohol is PVA1799::PVA0599:PVA2088=1:1:2.

[0050] The corrosion inhibition effect and corrosion control effect test of the formula:

[0051]

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PUM

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Abstract

The invention discloses a water injection corrosion inhibitor for sewage corrosion control of an oilfield production water injection system. The water injection corrosion inhibitor comprises the following components in percentage by mass: 1-20 percent of quinoline benzyl chloride quaternary ammonium salt, 1-10 percent of alcohol, 1-20 percent of organic urea, 1-10 percent of urotropine, 0.1-2 percent of potassium iodide, 1-15 percent of fatty amine polyoxyethylene ether surfactant, 1-15 percent of Gemini quaternary ammonium salt, 1-20 percent of polyvinyl alcohol and the balance of water, totaling 100 percent. Corrosion of various different types of injection sewage in the oilfield water injection system can be controlled, the corrosion inhibition rate can be over 80 percent when the dosage is 100mg / L, the corrosion rate can be controlled to be 0.076mm / a or below, and the problems that a water injection corrosion inhibitor in the market is narrow in property change adaption range of the injected sewage, the inhibition rate is low and inhibition effect screening evaluation is needed to be continuously performed aiming at the property changes of the injected sewage are solved.

Description

technical field [0001] The invention relates to the technical field of oilfield production, in particular to a water injection corrosion inhibitor used for the control of sewage corrosion in the water injection system of oilfield production, and is mainly used for the sewage corrosion control of sewage treatment systems, water injection pipelines, and downhole oil casings of water injection wells in oilfield production . [0002] technical background [0003] In the process of oil field production, with the prolongation of the production time, the pressure of the oil wells in the exploited oil wells continues to drop, resulting in a sharp drop in oil production. Relying on elastic oil recovery cannot meet the needs of production. Therefore, it is necessary to remove the separated water in the oil well output fluid. (Sewage) is injected into the oil well oil layer after treatment; on the other hand, the discharge of the separated water from the oil well output fluid into the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 王香增郭学辉王成达刘立张永强李辉余海棠白李杜素珍
Owner XIAN HUANUO ENVIRONMENTAL PROTECTION CO LTD