METHOD OF DEVELOPMENT OF OIL DEPOSITS Russian patent published in 2015 - IPC E21B43/14 E21B43/30 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: according to the method vertical wells are drilled and five-point development elements are formed with injectors located at corners of the development elements and producers located in the centre. Drilling is performed within limits of each development element of dual horizontally brunched wells (HBW) with rounded borehole ending. Working fluid is injected through injectors. Product is extracted through producers. At that in the deposit with to oil-bearing interlayers all vertical wells are drilled with penetration of these interlayers. Each development element is made with length of the edge equal to 4L, where L is quarter of distance between vertical injectors. From the central part of two opposite edges of the development element dual producing HBW are drilled. There boreholes are led in different directions towards inner side of the development element along circumference with radius 2L. Length of each borehole of the producing HBW is made equal to (0.9-1.l)·π·L, where π=3.14. From points formed at crossing in plane of conventional lines drawn from entries of producing HBW to the stratum and injectors at opposite edges of the development element dual injecting HBW are drilled. Boreholes are led in different directions towards inner part of the development element along circumference with radius L. Length of each borehole of injecting HBW is made equal to (0.3-0.5)·π·L. Each horizontal borehole is made in different oil-bearing interlayers. Parallel boreholes of producing and injecting HBW are also performed in different oil-bearing interlayers. Water-swellable packer is placed in the central part of each borehole of the producing HBW. Each injector is burned off for oil extraction for the period not exceeding three years.

EFFECT: increasing sweep efficiency and oil recovery rate from productive stratum of the oil deposit.

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