METHOD FOR DEVELOPMENT OF NON-HOMOGENEOUS OIL DEPOSIT Russian patent published in 2017 - IPC E21B43/20 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry and can be used in development of inhomogeneous oil deposit. Method for development of inhomogeneous oil deposit comprises selecting zones of high and average permeability. Injection wells are arranged on one side, and production wells at other side of medium permeability zone. Well pattern is sealed by drilling an additional production well in middle of medium permeability zone. Additional production well is operated until formation pressure in zone of medium permeability falls by 30 % below saturation pressure. Additional production well is stopped upon achieving formation pressure 10 % below saturation pressure. Production wells are stopped in zone of high permeability and recovery of formation pressure in zone of medium permeability to level of high-permeability zone is expected. All production wells are started and operated until formation pressure in zone of medium permeability is 30 % below saturation pressure. After that, production wells are stopped followed by waiting for recovery of formation pressure in zone of medium permeability to level of high-permeability zone. Producing wells in zone of high permeability are then started for a time of reduction of formation pressure in zone of medium permeability below value of formation pressure up to 50 %. Additional production well is converted to injection well. Well in zone of medium permeability is operated as injection well, and wells in zone of high permeability are operated as production wells.

EFFECT: technical result – increase of the deposit oil recovery factor.

1 cl, 2 ex, 1 dwg