METHOD TO DEVELOP MULTIZONE OIL RESERVOIR Russian patent published in 2013 - IPC E21B43/20 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: method includes downhole pumping of water from an underlying water-bearing bed into an overlying payout bed along an injection well and oil withdrawal from the payout bed via a producing well, which is hydrodynamically connected to the injection well. In accordance with the invention, a device is installed in the interval of the producing bed of the producing well for downhole separation of oil and water with the possibility to lift oil to the surface and discharge of water into the nearest underlying water-bearing bed and/or abandoned oil bed in the cut. Downhole pumping of water in the injection well from the underlying water-bearing bed and/or abandoned oil bed into the producing bed is carried out with the help of a pump, efficiency of which is accepted as not more than the intake of the producing bed, the injection well head is sealed, and the pump is put into operation. As water head reduces at the pump inlet in the injection well below a certain value, the pump is stopped, and the device for downhole separation of oil and water in the producing wall is put in operation. As water head increases at the pump inlet in the injection well above a certain value, the pump is put in operation, and the device for downhole separation of oil and water in the producing wall is stopped. If hydrodynamic connection between producing and injection wells deteriorates, operating equipment is withdrawn, hydraulic rupture of the producing and/or water-bearing beds is done. Afterwards operating equipment is again lowered, and development of the multizone oil reservoir is continued.

EFFECT: increased efficiency of method.

1 dwg