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
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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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