METHOD OF DEVELOPING OIL DEPOSITS IN FRACTURED RESERVOIRS WITH WATER OIL ZONES Russian patent published in 2016 - IPC E21B43/20 E21B43/12 E21B43/32 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and, in particular, to development of oil deposit in fractured reservoirs with water-oil zones. Method involves construction of vertical wells. Opened zone of fracturing or decompression of the deposit are determined in each well and oil-saturated interlayers are compacted. Horizontal producers are drilled in oil-saturated interlayers of compacted below the bed roof at the distance of 2-5 m and above oil-water contact at a distance not less than 10 m. Isolate the determined zones on both sides of packers with installation of controlled valves between them. Displacement agent is pumped into injection wells and oil is extracted through production wells until water cut of extracted oil is more than 75 %. After that, in horizontal wells periodic pumping of viscous water-insulating compositions, resistant to erosion by water is carried out. This operation is carried out at open controlled valves to increase pressure from initial at 30-50 %, but not exceeding crack opening pressure manifold. Pumping is performed so that formation pressure is leveled in horizontal shaft of production well and provide even oil displacement from pores collector upward section of bottom water.

EFFECT: technical result is increased oil recovery due to reduced watering of producing wells.

1 cl, 1 ex, 2 dwg