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

Inactive Publication Date: 2009-11-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of alkali will cause scaling problems in the injection-production system, and the emulsification of the produced fluid is difficult to break, which will have a serious adverse effect on oilfield production

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Polyoxypropylene nonylphenol ether sodium sulfate-5 (component 1) and tetradecyl betaine (component 2) were compounded in different proportions to form a foaming agent, and the foaming volume and half-life of the system were measured. As well as the interfacial tension with pile 106-15-X18 heavy oil (viscosity 325mPa.s at 50°C), the results are shown in Table 1. It can be seen that after the two surfactants are compounded, the foam stability is increased by nearly 2 times, and the interfacial tension has reached an ultra-low value.

[0025] The performance of table 1 blowing agent

[0026]

Embodiment 2

[0028] Polyoxypropylene nonylphenol ether sodium ethyl sulfonate-3 (component 1) and lauryl betaine (component 2) were compounded in different proportions, and the foaming volume and liquid separation of the compound system were measured. See Table 2 for the half-life and the interfacial tension with Shengli Chenzhuang 13-15 heavy oil (viscosity 1600mPa.s at 50°C). It can be seen that after the two surfactants are compounded at a mass ratio of 1:1 to 1:4, the foam volume and foam half-life increase, and the interfacial tension reaches an ultra-low value.

[0029] The performance of table 2 blowing agent

[0030]

Embodiment 3

[0032] The drag coefficient is the ratio of the pressure difference of the fluid passing through the porous medium to the water drive pressure difference. The larger the resistance coefficient, the stronger the plugging ability of the fluid to the porous medium, and the larger the sweep coefficient.

[0033] The foaming agent is composed of 0.04% polyoxypropylene nonylphenol ether sodium sulfate-5 and 0.06% myristyl betaine. The gas flow is controlled by the gas mass flow meter SFC4000 produced by Swiss SENSIRION company, and the permeability is 3.340μm 2 Nitrogen and foaming agent solution were injected into the epoxy resin cemented artificial rock core at the same time, and the resistance coefficient of the foam generated at different gas-liquid ratios was measured, and compared with the partially hydrolyzed polyacrylamide with a molecular weight of 18 million, it was found that the gas-liquid ratio was The resistance coefficient produced by the foam of 0.125:1 is comparabl...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
Inventor 葛际江张贵才孙铭勤王东方
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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