OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2006 - IPC E21B43/16 

FIELD: oil production industry, particularly to develop multizone hydrocarbon reservoirs including oil and water-bearing pools divided with rock layers.

SUBSTANCE: method involves drilling horizontal wells with cased side bores, wherein one side bore, which is the outermost from well head, is directed upwards to gas-bearing reservoir interval crossing zone, other side bores are directed downwards towards oil-bearing reservoir interval crossing zone; using natural oil gas-lift; exposing oil-bearing interval; creating filtration screen. Horizontal sections of production wells are drilled above oil-bearing interval. Filtration screens are created at oil-water boundary, where longitudinal formation permeability exceeds transversal permeability. The screens are formed by injection of liquid having viscosity greater than that of oil through lower side bore under oil-water boundary. Ejector and control by-passing means are installed in each well between oil-bearing intervals-pool and gas-bearing intervals, used as energy sources. The ejector and control by-passing means are adapted for natural gas-lift regulation and are operated from ground surface.

EFFECT: increased oil and gas condensate recovery by applying complex action on oil rim due to efficient well bores arrangement in reservoirs, increased oil recovery surface (perforation zone) and reduced differential pressure drawdown.

2 dwg