METHOD FOR DEVELOPMENT OF NON-UNIFORM OIL DEPOSIT Russian patent published in 2009 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil production industry and may be used in development of oil deposit with severe zonal or bed non-uniformity by means of its waterflooding. Method includes supply of pressurised working substance in deposit, and this working substance displaces oil, and then produce is withdrawn through production wells. According to invention, working substance used is heterogeneous gas-liquid foam system based on water with addition of soda amount equimolar in rigidity and addition of powdery solid phase in amount of 0.2-0.5 wt % from water weight. At that gas ratio in foam system is accepted in range of values of (4.6 - 9.9) P_b, where P_b is bed pressure. Mentioned solid phase contains 2-5% from weight of powdery solid phase of particles with dispersion of 0.8-12 millimicron.

EFFECT: increased method efficiency due to increased action coverage of deposit.

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