METHOD FOR DEVELOPING A MULTILAYER OIL DEPOSIT Russian patent published in 2023 - IPC E21B43/14 E21B23/10 E21B34/08 

FIELD: oil industry.

SUBSTANCE: method for developing a multi-layer oil deposit is claimed. The method includes downhole pumping of water from the underlying aquifer to the overlying productive formation in natural mode due to the energy of the aquifer through injection wells. The method also includes the extraction of oil from the reservoir through production wells. Each injection well is equipped between the layers with a packer and saddles, inside which valves are installed that allow water to pass from bottom to top. The valves are made with less than zero buoyancy in the pumped water, which ensures the flow of water at a pressure drop higher than that selected for this injection well. Before running the packer, the packer is equipped with a central calibrated polished channel for the nipple. Saddles are made double, consisting of upper and lower saddles, connected by a branch pipe with overflow radial channels between the saddles and the nipple from below. The upper and lower valves are connected by a radially rigid pusher, which is made in the form of rods telescopically inserted into each other, expanded in different directions to the stops by a spring, which ensures that the valves are sequentially closed from bottom to top to prevent water flows between the layers when excess pressure is applied from the wellhead and having a force, with closed valves, exceeding the force of the liquid column of the filled well. Seats with valves are lowered on the process string until the tight interaction of the nozzle nipple and with the packer channel before the start of the injection well. Excessive pressure to close the valves is maintained in the process column.

EFFECT: creation of a method for the development of a multi-layer oil deposit, which allows injection in an intermittent mode with controlled pressure from the wellhead with control of the injectivity of the oil-bearing formation and the productivity of the aquifer in it, to ensure the required volume of water injection into the productive formation.

1 cl, 6 dwg