PROCEDURE FOR FAN-LIKE INTERVAL-BY-INTERVAL OPERATION OF OIL PRODUCING WELLS Russian patent published in 2011 - IPC E21B43/20 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in drilling pressure boreholes and multi-hole producers with horizontal arrangement of boreholes in region of payout bed wherefrom fluid is withdrawn. According to the invention side boreholes, horizontal in the payout bed, are arranged symmetrically in radial direction relative to the main borehole. Fluid is withdrawn from wells cyclically from each interval starting from the last drilled side horizontal borehole and ending with the main borehole. Also, fluid is withdrawn from each interval of the bed drained with the main and side horizontal boreholes till current bed pressure drops to 60-80% from initial or till water cut in withdrawn product rises to 100%. Repetition of cycles and well operation are terminated upon complete exhaustion of oil reserves from the part of the payout bed drained with these wells.

EFFECT: raised yield of oil from beds with non-uniform permeability and reduced expenditures for drilling operations.

2 dwg