METHOD OF DEVELOPING OIL DEPOSITS Russian patent published in 2016 - IPC E21B43/14 E21B43/20 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, namely to development of oil deposit in carbonate and terrigenous reservoirs by drilling vertical and multi-branch wells with horizontal ends. Method involves drilling in the deposit of vertical and horizontal multi-branch wells using an engineering grid with formation of development elements. Working reagent is cyclically pumped into every injection and production well through injection wells. Product is extracted through production wells. Oil output, as well as water and pumped fluid consumption are measured. There is also conducted a hydrodynamic research and maintaining of the formation pressure in the extraction area at the level of the initial value. Before drilling of the deposit with areal development system there are selected sites with two or more producing formations and/or interlayers in the section. Elements are formed on sites by penetrating these formations and/or interlayers with vertical injection wells. Production well is drilled in elements with horizontal arrangement of sites in every formation and/or interlayer in the direction of injection wells until reaching the corresponding injection wells in the corresponding formation and/or interlayer. Area of every horizontal borehole has a bridge plug ensuring insulation and separating the horizontal borehole from the injection well borehole for a distance of not more than 40-60 m. Production well head is isolated in such a way, that the extraction zone constitutes 5-24 % of the total length of the horizontal area from the point of entry into the formation. Injection well is equipped with devices for simultaneous-separate pumping of working agent into every penetrated formation and/or interlayer corresponding wells with intervals and pressure ensuring maximum restoration of pressure in the extraction area during oil displacement and not leading to premature flooding of the extracted product.

EFFECT: technical result is increased oil recovery.

1 cl, 1 ex, 2 dwg