INVERT MICROEMULSION FOR TREATING OIL BEDS Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: this is aimed at reducing amount of chemical agents used for preparation of microemulsion with simultaneous retention of its oil displacing properties. Invert microemulsion for treating oil beds has following components, mass%: liquid hydrocarbon 10.0-20.0; emulsifier 0.3-0.5; calcium chloride 0.3-1.5; water - the balance. Used in function of hydrocarbon are hexane fraction, stabilized gasoline, gas condensate, diesel fuel, and also low-viscosity oil. Emulsifier is represented by hydrocarbon solution of ethers of acids of tall oil and triethanolamine. In comparison with prototype substance, considerably reduced is amount of chemical agents needed, namely 0.6-6.5% against 8.0-18%. This is accompanied with 10-12% increase of oil separating effect of microemulsion and twice reduced is permeability as to water. EFFECT: higher efficiency. 1 tbl