METHOD FOR DEVELOPMENT OF OIL DEPOSIT AT LATE STAGE Russian patent published in 1998 - IPC

FIELD: oil production industry. SUBSTANCE: according to method, increased oil recovery is achieved due to larger embracing of bed by watering. Performed during drilling and operation is investigation of wells and determined are parameters of oil bed. Structural map is plotted and revealed are wells with high level mark of bed roof. Limited is injection of water into injection wells with high level mark of bed, and recovery of liquid is increased in producing wells. In result, bed pressure is reduced below pressure of saturating oil with gas. Gas separates from oil and occupies roof part of bed, and oil is displaced to lower parts of bed. Injected water reagent goes to roof part of bed, thus displacing oil to producing wells. EFFECT: high efficiency. 3 dwg