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High-efficiency air foam oil displacement system

A technology of foam flooding and high-efficiency air, which is applied in the directions of drilling compositions, chemical instruments and methods, can solve the problems of low sweep efficiency of conventional water flooding, affecting the development effect of water injection in oil fields, etc., and achieves improvement of mobility ratio and channeling effect. Flow phenomenon, strong salt resistance, good compatibility

Inactive Publication Date: 2014-01-08
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the above-mentioned reservoir heterogeneity, the sweep efficiency of conventional water flooding is often low, which affects the development effect of oilfield water flooding.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The present invention is realized in the following ways:

[0013] At 30°C, disperse and dissolve the partially hydrolyzed polyacrylamide HPAM with the filtered sewage from the Yanchang Oilfield to prepare 100mL of a solution with a mass concentration of 1500mg / L, and then add 0.12% by mass of fluorocarbon 101005 (No. 2). Foaming agent, adding mass percentage is 0.08% dodecyl hydroxypropyl phosphate betaine, adding mass percentage is 0.1% BS betaine.

[0014] Finally, 30 mL of oilfield dehydrated crude oil was added to the aqueous solution of the composite system to simulate the displacement condition of the oil layer with a residual oil saturation of 30% in the pores of the oil layer. The performance test of the above air foam system shows that the system has good compatibility, the foam comprehensive index can reach 5462 when the air-liquid ratio is 3:1, and the oil-water interfacial tension can reach 3.83×10 -2 mN / m.

[0015] Among them, the trade name of fluorocarb...

Embodiment 2

[0017] The present invention is realized in the following ways:

[0018] At 30°C, disperse and dissolve part of the hydrolyzed polyacrylamide HPAM with the filtered sewage from the Yanchang Oilfield to prepare 100 mL of a solution with a mass concentration of 1500 mg / L, and then add 0.08% dodecyl hydroxypropyl phosphate For ester betaine, 0.12% by mass of fluorocarbon 101005 (No. 2) foaming agent is added. No. 2 refers to the serial number, and 0.1% by mass of BS betaine is added.

[0019] Finally, 30 mL of oilfield dehydrated crude oil was added to the aqueous solution of the composite system to simulate the displacement condition of the oil layer with a residual oil saturation of 30% in the pores of the oil layer. The performance test of the above air foam system shows that the system has good compatibility, the foam comprehensive index can reach 5462 when the air-liquid ratio is 3:1, and the oil-water interfacial tension can reach 3.83×10 -2 mN / m.

[0020] The above-menti...

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Abstract

The invention provides a high-efficiency air foam oil displacement system. The high-efficiency air foam oil displacement system is characterized in that the high-efficiency air foam oil displacement system is prepared by return water of oilfields, and is prepared by the following raw materials in percent by mass: 0.12% of perfluorocarbon 101005 foaming agents, 0.08% of dodecyl phosphate hydroxypropyl betaine, 0.1% of surfactant BS betaine, and the balance partially hydrolyzed polyacrylamide. The oil displacement system has excellent adaptation on high-salinity and high-oil sewage returned from the oilfields, is high in compatibility, high in salt tolerance and excellent in foaming characteristic and stability; a displacement section can be effectively adjusted; interfacial tension is reduced; swept volume is increased; and recovery efficiency of the oilfields is improved.

Description

technical field [0001] The invention relates to an air foam flooding system which can be used for enhancing the recovery rate of an oil field, in particular to a high-efficiency air foam flooding system suitable for low permeability and high salinity oil fields. Background technique [0002] In the process of oilfield development, there are often reservoir heterogeneity contradictions, such as the existence of high permeability channels such as fractures and large pores, which lead to a large permeability gap within or between reservoirs. Waterflooding is a common and effective production technology in oilfields at home and abroad, which plays a vital role in improving oil recovery. However, due to the above-mentioned reservoir heterogeneity, the sweep efficiency of conventional water flooding is often low, which affects the development effect of oilfield water flooding. Air foam flooding is an effective measure to block high-speed seepage channels such as fractures and lar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 高瑞民余华贵黄春霞江绍静张新春周海成康宵瑜王蓓蕾尚庆华赵永攀
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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