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Fluorocarbon surfactant oil-displacing system, and preparation method thereof

The technology of surfactant flooding and surfactant is applied in the field of oil flooding system and its preparation.

Inactive Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to use fluorocarbon surfactant, fatty alcohol polyoxyethylene ether sulfate and anionic polyacrylamide as the oil displacement agent in view of the shortcomings of the current oil displacement agent for tertiary oil recovery that the displacement effect is not obvious and the system contains alkali. A combination of components to prepare an oil displacement system with good oil displacement effect, non-alkali oil displacement system, and good temperature resistance, which is suitable for oil displacement system used in oil field displacement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Accurately weigh 1.0 g of anionic polyacrylamide (molecular weight: 15 million), 1.5 g of sodium fatty alcohol polyoxyethylene ether sulfate (m=9, n=2), fluorocarbon surfactant (m=8, n=1) ) 0.5g, add to appropriate amount of water in turn, stir slowly until each component is completely dissolved, then add water to 1000g. Take this sample, and at 80°C, it is measured that it can reduce the oil-water interfacial tension of Henan oilfield crude oil to 2.09×10 -3 mN / m, and the indoor simulation increases the recovery rate to 19.8%.

Embodiment 2

[0026] Accurately weigh 1.5 g of anionic polyacrylamide (molecular weight: 18 million), 1.0 g of sodium fatty alcohol polyoxyethylene ether sulfate (m=12, n=4), fluorocarbon surfactant (m=8, n=2) ) 0.5g, add to appropriate amount of water in turn, stir slowly until each component is completely dissolved, then add water to 1000g. Take this sample, and at 80°C, it is measured that it can reduce the oil-water interfacial tension of crude oil in Henan Oilfield to 4.17×10 -3 mN / m, the indoor simulation increases the recovery rate to 13.2%.

Embodiment 3

[0028] Accurately weigh 3g of anionic polyacrylamide (molecular weight: 15 million), 0.5g of sodium fatty alcohol polyoxyethylene ether sulfate (m=9, n=4), fluorocarbon surfactant (m=6, n=1) 2.0g, add in appropriate amount of water in turn, stir slowly until each component is completely dissolved, then add water to 1000g. Take this sample, and at 80°C, it is measured that it can reduce the oil-water interfacial tension of crude oil in Henan Oilfield to 1.73×10 -3 mN / m, the indoor simulation increases the recovery rate to 12.4%.

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Abstract

The invention discloses an oil-displacing system suitable for tertiary oil recovery, and a preparation method thereof. The oil-displacing system is prepared from, by mass, 0.05 to 0.4% of a fluorocarbon surfactant, 0.01 to 0.4% of polyoxyethylene fatty alcohol sodium sulfate, 0.01 to 0.3% of anionic polyacrylamide, and the balance water. According to the preparation method, the ingredients are stirred slowly at 40 DEG C for complete dissolving so as to obtain the oil-displacing system. The oil-displacing system is capable of reducing oil-water interfacial tension value to 10<3>mN / m magnitude order at 80 DEG C, and reaching ultralow interfacial tension, and increasing indoor stimulation enhanced oil recovery rate to more than 12%. The oil-displacing system is capable of reducing the oil-water interfacial tension value to be ultralow, is excellent in oil displacing effect, and is capable of satisfying requirements of oilfield development.

Description

technical field [0001] The invention relates to an oil-displacement system suitable for oilfield development, having good temperature resistance and excellent oil-displacement effect and a preparation method thereof. Background technique [0002] Crude oil is a non-renewable resource. With the development of society, the demand for crude oil is increasing. In my country's oil resources, heavy oil and super heavy oil resources are about 25 billion tons, accounting for about 28% of the total. At present, the heavy oil recovery method at home and abroad is mainly thermal oil recovery. China's petroleum industry focuses on the development of thermochemical flooding technology for heavy oil reservoirs. In the process of steam injection, chemical additives, surfactants and nitrogen are added to reduce steam mobility. , enhance thermal effect, form thermochemical flooding, improve swept volume and oil displacement efficiency. Ordinary surfactants may decompose and have insufficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
CPCC09K8/584C09K8/588
Inventor 曾志强袁俊秀朱魁
Owner CHINA PETROLEUM & CHEM CORP
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