OIL POOL DEVELOPMENT METHOD Russian patent published in 1995 - IPC

FIELD: oil industry. SUBSTANCE: oil pool development method involves injection of industrial wastewater by means of injection wells into the lost circulation horizon and withdrawal of oil by means of producing wells. The lost circulation horizon is a bed containing water similar to industrial wastewater in its content of minerals. The bed is located beneath the cryogenic confining bed and above the horizon with alternating sand and clay partings. The initial wastewater injection pressure is maintained not lower than the pressure of opening of natural cracks in the lost circulation horizon. Wastewater is pumped in at the initial stage until the bed pressure increment in the lost circulation horizon is not greater than 1.4 times, and at the final stage not greater than 2.1 times. EFFECT: higher efficiency; improved wastewater disposal. 1 tbl