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Corrosion inhibitor for oil field reinjection water

A technology for reinjecting water and corrosion inhibitors in oilfields, which is applied in the field of special chemicals for oilfields, and can solve the problems of high organic content, corrosion of copper and its alloys, and high cost

Inactive Publication Date: 2016-04-13
WEIHAI XIANGYU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The water quality of oilfield sewage is relatively complex, and there are a series of problems in the water injection process: hydrogen sulfide, carbon dioxide, oxygen and other gases are dissolved to varying degrees, various microorganisms are widely present, and the content of organic matter is high, and the sewage salinity is high
However, the corrosion inhibitor contains aminotrimethylene phosphonic acid, which will corrode copper and its alloys
And use terpolymer, the cost is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select raw materials by weight percentage

[0017] Deionized water 30%

[0018] Imidazoline quaternary ammonium salt 45%

[0019] Tannin 10%

[0020] 2-Phosphono-1,2,4-tricarboxylic butane 15%

[0021] Add 30% deionized water to the reaction kettle; then add 10% tannin to the reaction kettle, mix and stir for 30 to 60 minutes; add 45% imidazoline quaternary ammonium salt and 15% 2-phosphono-1,2,4-butane tricarboxylate and stirred for 15-30 minutes.

Embodiment 2

[0023] Select raw materials by weight percentage

[0024] Deionized water 40%

[0025] Imidazoline quaternary ammonium salt 30%

[0026] Tannin 20%

[0027] Sodium ethylenediamine tetramethylene phosphonate 10%

[0028] Add 40% deionized water to the reaction kettle; then add 20% tannin to the reaction kettle, mix and stir for 30 to 60 minutes; add 30% imidazoline quaternary ammonium salt and 10% Sodium ethylenediamine tetramethylene phosphonate, and stirred for 15 to 30 minutes.

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Abstract

The invention provides a corrosion inhibitor for oil field reinjection water. The corrosion inhibitor for the oil field reinjection water contains deionized water, imidazoline-ammonium salt, tannin and organic phosphonic acid. The mass percent of deionized water, imidazoline-ammonium salt, tannin and organic phosphonic acid is 30-60:15-65:5-10:2-15. An impermeable protective film of a net-shaped structure can be generated through the reaction between the corrosion inhibitor and iron ions or ferric oxide on the metal surface, iron corrosion can be restrained, and therefore the corrosion inhibition function can be achieved. In addition, the dirt blocking performance is achieved, deposition of calcium carbonate on the pipe wall of a heat exchanger can be reduced, and deposition of calcium sulfate in water can be reduced.

Description

technical field [0001] The invention belongs to oil field special chemicals, in particular to a corrosion inhibitor used for oil field reinjection water. Background technique [0002] The water quality of oilfield sewage is relatively complicated, and there are a series of problems in the water injection process: hydrogen sulfide, carbon dioxide, oxygen and other gases are dissolved to varying degrees, various microorganisms are widely present, and the content of organic matter is high, and the sewage salinity is high. They can corrode metal equipment and pipelines, and oilfield wastewater with high salinity or acid gas content can even cause pipeline "perforation". [0003] According to the survey of my country's second largest oilfield, Shengli Oilfield, in 2003, it was found that there were more than 8,000 water injection wells in 11 oil production plants with a total length of 15.83 million meters. The average corrosion rate reached 1.5 mm, and the average perforation ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10
CPCC23F11/10
Inventor 王俊谕李洪社喻果
Owner WEIHAI XIANGYU TECH