LESS EXPLORED OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2015 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: according to the method a deposit is drilled out by wells as per the wide well spacing pattern. Deposits are surveyed with the determination of their hypsometric depths. New wells are constructed and offshoots or horizontal offshoots are drilled from the existing wells towards the maximum oil saturation of the deposit. At that a seismic survey is performed with the determination of several oil-saturated zones in the deposit with advanced permeability and porosity both in the square area and altitude of the reservoir. Availability and position of fault lines is defined additionally. New horizontal or inclined wells are constructed as per an irregular pattern so that horizontal or inclined section of these wells passes through the selected oil-saturated zone with the maximum filtering area. Construction of offshoots or horizontal offshoots from the existing wells is made towards the closest oil-saturated zone so that they pass the maximum filtering area upon drowning of the wells or reduction of the oil flow rate below the profitable value. The offshoots or horizontal offshoots pass through the zone with the effective oil-saturated thickness of at least 10 m when water-bearing reservoirs are available in the stratum foot, or at least 4 m when the water-bearing reservoirs are not available in the stratum foot. The inclined offshoots or horizontal offshoots pass through the oil-saturated zone perpendicular or at an acute angle towards the deposit fault line at the distance that allows the prevention of fast drowning of the extracted product.

EFFECT: higher efficiency of development for a less explored oil deposit.

2 cl, 1 ex, 1 dwg