FIELD: oil extractive industry, possible use when extracting water and oil from wells.
SUBSTANCE: method includes dividing liquid in well on water and oil and separately extracting water and oil. In accordance to invention, in water saturation of oil product well exceeds 99,5% it is transferred to class of water product wells in formation pressure maintenance system with incidental extraction of oil. For that purpose well is outfitted with two tubing strings with pumps. First string is lowered for depth, filled with water, separated during gravitational division of oil. Second column is lowered for depth, close to well mouth, into oil accumulation zone, influx from productive formation is maintained by draining constant amount of water via first tubing string from condition of prevention of precipitation of mudding substances in a well and well-adjacent formation zone. Extraction of oil via second tubing string is performed constantly or periodically depending on oil accumulating in a well.
EFFECT: ensures extraction of incidental oil during main extraction of water for formation pressure maintenance system.
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