Foaming agent with low gas liquid ratio foam for common heavy oil reservoir and injection method thereof

A heavy oil reservoir and foaming agent technology, applied in chemical instruments and methods, earthwork drilling and production, and drilling compositions, etc., can solve the fouling of injection production system, difficulty in emulsification of produced fluid, and adverse effects on oil field production And other problems, to achieve the effect of high oil washing efficiency
CN101580705AInactive Publication Date: 2009-11-18CHINA UNIV OF PETROLEUM (EAST CHINA)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (EAST CHINA)
Publication Date
2009-11-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a foaming agent for low gas liquid ratio foam flooding for improving recovery ratio of common heavy oil reservoir and an injection method thereof. The foaming agent is prepared from a nonionic-anionic surfactant, a betaine type amphoteric surfactant and water, wherein the nonionic-anionic surfactant accounts for 0.01 to 0.03 weight percent of the total weight; the betaine type amphoteric surfactant accounts for 0.05 to 0.3 weight percent of the total weight; and the balance is oil field injection water. The foaming agent has good foaming tendency, can reduce the interfacial tension of oil and water to the lowest under the condition of not adding alkali, and can give full play to the foam flooding and the improvement of conformance factor and displacement efficiency. On the basis of the foaming agent, when the gas liquid ratio is between 0.1:1 and 0.3:1 (volume ratio), the generated foam can improve the recovery ratio by over 10 percent, and the technology with low cost and good effect for improving the recovery ratio of the heavy oil reservoir is realized.
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Description

Technical field:

[0001] The invention relates to a chemical method for increasing the recovery rate of heavy oil reservoirs, in particular to a foaming agent used in foam flooding and an injection method thereof. Background technique:

[0002] The crude oil in ordinary heavy oil reservoirs developed by water injection has high viscosity and poor fluidity, but the water flow channels in the reservoirs are well developed, resulting in low water flooding oil sweep coefficient. Therefore, the recovery rate of heavy oil reservoirs developed by water flooding is at least 10% lower than that of conventional reservoirs. Because foam flooding can not only improve the sweep coefficient, but also improve the oil washing efficiency, foam flooding is a more suitable replacement technology for the later stage of water flooding in ordinary heavy oil reservoirs.

[0003] One of the key technologies of foam flooding is the determination of gas-liquid ratio. In conventional foam flooding, t...

Claims

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