METHOD OF DEVELOPING FRACTURED OIL FORMATION Russian patent published in 2000 - IPC

FIELD: development of oil deposits, particularly, methods of heat stimulation of fractured formations containing high-viscosity oil. SUBSTANCE: method includes driving of mine working below oil formation and two gently rising injection and producing wells. Injected into injection wells is steam until temperature in producing wells reaches maximum permissible value excluding formation of vapor at current formation pressure. During steam injection into injection wells withdrawal of oil from producing wells is discontinued. Then steam injection is stopped, and oil withdrawal from producing wells is started and continued until temperature of withdrawn fluid drops to value below which oil viscosity sharply rises. Oil withdrawal is discontinued and steam injection and oil withdrawal cycles are repeated. EFFECT: reduced heat losses and improved temperature conditions in mine workings due to prevention of steam break through formation fractures. 3 dwg