METHOD FOR EXPLOITATION OF DROWNED OIL DEPOSIT Russian patent published in 2004 - IPC

FIELD: oil extraction industry. SUBSTANCE: methods includes boring of take and delivery wells. Displacing agent is pumped through delivery wells. Pressure controlling and adjusting systems are formed between oil and water portions of the layer. Oil is periodically withdrawn. During product withdrawal from take wells, sources of drowning of take wells are consecutively determined as well as pressure in zones of water and oil influx. After that, pressures in this zones are compared. Wells are selected, at which oil is received under greater pressure than water. These wells are operated by periodical withdrawal. Well is stopped for a time, which is enough for drowning tongue to move away from the well and for filling of face layer zone with oil. EFFECT: increased speed of oil withdrawal with concurrent lowered amount of co-extracted water. 3 dwg, 1 ex