METHOD OF OIL DEPOSIT DEVELOPMENT Russian patent published in 2012 - IPC E21B43/20 

FIELD: gas and oil production.

SUBSTANCE: method involves selection of a sector with common oil-saturated strata over 13 m in carbonate collectors and/or sector with effective oil-saturated strata of 3 m thickness or more in oil zone and 5 m thickness or more in oil and water zone in terrigenous collectors before deposit reaming, drilling of vertical and/or directional sloping injection well in the centre of each element. Multihole wells with horizontal semi-circular endings are positioned at the sides of each element, each well encompassing half of element, with one ascending branch in the middle of half-circle, directed to the element corner to produce oil stock in production bed top. Multihole horizontal well in an element replaces two horizontal or three vertical and/or directional sloping wells at the element sides and corners. Replacement work agent is injected through injection well drilled in the element centre to production interval bottom in cycles. Optimum injection period is determined for maximum recovery of pressure in extraction zone and oil displacement from matrix.

EFFECT: increased waterless period of oil extraction, prolonged operation and enhanced well performance.

1 ex, 2 dwg