METHOD FOR DEVELOPMENT OF SECTION OF OIL RESERVOIR WITH HETEROGENEOUS RESERVOIR (VERSIONS) Russian patent published in 2025 - IPC E21B43/20 E21B43/30 

FIELD: obtaining oil from wells.

SUBSTANCE: invention relates to oil industry and can be used in development of bed oil deposit in heterogeneous terrigenous reservoir of porous type. In particular, disclosed is a method of developing a section of an oil reservoir with a heterogeneous reservoir, which includes drilling production and injection wells, pumping a displacement agent through injection wells, extraction of products through producers, determination of boundaries of development zones of non-reservoir and extraction of products from stagnant zones in fractured zone of zones of reservoir replacement. At the same time boundaries of reservoir development zones are determined. In case of watering of vertical production well in fractured zone of reservoir replacement zones up to 98%, it is transferred to injection stock. At that, two side horizontal shafts are drilled from it – SHS, with opposite direction to each other with length of not less than 150 m in horizontal part and departure from the main vertical shaft of not less than 100 m and parallel to the non-collector propagation line. In stagnant zones near non-reservoirs distribution zones horizontal production wells are drilled with length of horizontal part of not more than 250 m in less permeable interlayer and not less than 1 m from the deposit bottom. Thereafter, the well with SHS is developed for injection and horizontal production wells are put into operation. At the same time pumping of displacement agent through the well with SHS is performed in cyclic mode: at injection to vertical borehole of the well during two days, the SHS are in idle state, then at injection to SHS during five days, vertical shaft is idle.

EFFECT: increasing productivity of wells due to increased coverage of the formation by drainage and involvement of oil reserves at the boundary and in the fractured zone of reservoir replacement zones.

2 cl, 1 dwg