High-efficiency oil displacement agent

An oil-displacing agent, high-efficiency technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of surfactant loss of activity, poor salt resistance, etc., achieve high activity, good oil displacement effect, and solve the problem of The effect of poor salt resistance

Inactive Publication Date: 2010-11-17
国粮物资能源(陕西)集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After years of theoretical research and field tests, it is agreed that anionic surfactants are the preferred surfactants for oil flooding, but the biggest disadvantage of anionic surfactants is their poor salt resistance, especially for divalent surfactants in reservoir fluids. Ions (Ca 2+ , Mg 2+ ) is particularly sensitive. When the concentration of divalent ions is greater than 300mg / L, anionic surfactants are added to produce precipitation, and the surfactants lose their activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] in 2M 3 Add 500kg of tap water (or oilfield reinjection water), stir at room temperature, and at the same time add 3kg of N,N'-dilauroylethylenediamine dipropionate sodium at one time, OP-103kg after stirring for 30 minutes, add 454kg sodium tetradecylbenzene sulfonate, stirring continuously for 30 minutes is the oil displacing agent product of the present invention. The result of detecting the surface tension of its 0.3% aqueous solution is: 37.

Embodiment 2

[0049] in 2M 3 Add 500kg of tap water (or oil field reinjection water) to the reaction volume, stir at room temperature, and at the same time add 5kg of N,N'-dilauroylethylenediamine dipropionate sodium at one time, OP-105kg after stirring for 30 minutes, add 400kg sodium tetradecylbenzene sulfonate, continuously stirred for 30 minutes is the oil displacement agent product of the present invention. The result of detecting the surface tension of its 0.3% aqueous solution is: 34.2.

Embodiment 3

[0051] in 2M 3 Add 500kg of tap water (or oil field reinjection water) to the reaction volume, stir at room temperature, and at the same time add 7kg of N,N'-dilauroylethylenediamine dipropionate sodium at one time, OP-107kg after stirring for 30 minutes, add 436kg sodium tetradecylbenzene sulfonate, stirring continuously for 30 minutes is the oil displacement agent product of the present invention. The result of detecting the surface tension of its 0.3% aqueous solution is: 39.

[0052] Conclusion: Example 2 is the preferred solution.

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Abstract

The invention provides a high-efficiency oil displacement agent. The high-efficiency oil displacement agent consists of C12 to C16 alkyl benzene sulfonates serving as an anionic surfactant, a dianionic surfactant, nonylphenol polyoxyethylene ether (OP-10) and water. The high-efficiency oil displacement agent has the advantages of high activity, good oil displacement effect and capability of substantially meeting the requirements of different salinity conditions of onshore oil fields in China. The ratio of input to output is about 1 to 6, and the application range expands continuously, so the high-efficiency oil displacement agent is practical and high-efficiency technology.

Description

technical field [0001] The invention relates to a formula composition, production process and application of an oil displacement agent. Background technique [0002] Most of my country's onshore oil exploitation has entered the middle and late stages. The comprehensive water content of oil wells is as high as 85%, and the water content of some oil wells has reached more than 90%. However, the oil recovery rate is only about 30%, and there are still about 60% of oil underground. Not mined. So various methods of enhancing oil recovery appear one after another, among which surfactant is used as an oil displacement agent to drive oil, which is one of the more ideal methods for enhancing oil recovery. [0003] The use of surfactants as oil displacement agents in oil fields is a method and process that has been researched and perfected in oil fields. However, for decades, surfactants as oil displacing agents have not gone out of the experimental area, and have not reached the goa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
Inventor 胡帅
Owner 国粮物资能源(陕西)集团有限公司
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