METHOD FOR DEVELOPMENT OF OIL POOL Russian patent published in 1996 - IPC

FIELD: development of oil pools. SUBSTANCE: displacing agent is injected through injection wells with simultaneous stopping of producing wells selected for forced recovery of fluid in the next half-cycle. During the period of half-cycle of pressure drop in formation, selected injection wells are stopped simultaneously with forced recovery of fluid from producing wells selected for the purpose. Selection of wells for forced fluid with drawl is effected with satisfaction of unequaled Zn > 0.5 and Zb > 0.5, where Zn and Zb are Spirman ranked correlation factors, respectively, between flow rate of fluid and oil and flow rate of fluid and water in the given well. In half-cycle of pressure rise in formation, displacing agent is injected into all injection wells and producing wells selected for forced recovery of fluid in the next half-cycle are stopped. In half-cycle of pressure drop in formation, stopped are only those injection wells which have hydrodynamic oil communication with the nearest producing wells. Stopping of these wells results in increase of oil content in neighboring producing wells. Simultaneous stopping of selected injection wells and forced withdrawal of fluid from selected producing wells allow increase of withdrawal of fluid and oil from the pool areas possessing high values of oil saturation. Pressure drop caused by stopping of selected injection wells is added by forced fluid withdrawal from selected producing wells. EFFECT: higher efficiency. 2 tbl