METHOD OF OIL POOL DEVELOPMENT USING BRANCHED HORIZONTAL WELLS Russian patent published in 2014 - IPC E21B43/30 

FIELD: oil-and-gas industry.

SUBSTANCE: injection wells and horizontal extracting wells are drilled, displacing agent is injected via injection wells and oil is extracted through horizontal producing wells. Producing wells are composed of branched horizontal wells drilled above water-oil surface (WOS) while vertical wells are drilled at last 50 m from branched horizontal well bottoms, completion of vertical well pool and under appropriate bottom of horizontal well. Note here that vertical well completion above appropriate bottom is effected with larger density of exposed holes than exposing under appropriate bottom to create more uniform flooding front.

EFFECT: higher reservoir recovery, oil extraction rate, maximum coverage of residual oil reserves to be developed.

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