METHOD FOR DEVELOPMENT OF DEPOSIT COMPLICATED BY VERTICAL INTERRUPTIONS Russian patent published in 2016 - IPC E21B43/20 E21B43/12 E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, specifically to development of stratified oil deposits, complicated by vertical interruptions, displacement of working agent. Method comprises determining hypsometric marks of formation. Placing vertical and horizontal production, injection wells, except zones of maximum fall of hypsometric marks of formation in immediate vicinity of faults. Vertical producers are arranged along them. Displacement agent is injected into injection wells and product is extracted from production wells. Vertical producers are transferred into injection wells with decrease in flow rate below level of efficiency. Additional horizontal boreholes are drilled, directed towards fracture line. Method includes determining impermeable boundaries of faults in deposit, splitting formation into sections with different formation pressure. Before transfer of flooded production wells for injection of working agent to maintain formation pressure additional horizontal boreholes are drilled with opening of non-permeable boundary of faults of flooded section of formation with higher bed pressure in oil-bearing formation section above level of oil-water contact. Method comprises performing overflow of fluid from one section of formation in other section with low formation pressure on additional horizontal boreholes. Volume of pumped from surface of displacement agent through injection wells in area with low pressure is reduced.

EFFECT: technical result is increased efficiency of development due to saving working fluid and energy for pumping in oil-bearing section of formation of liquid and energy of adjacent sections.

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