METHOD FOR DEVELOPING OIL DEPOSITS WITH LOW-PERMEABILITY RESERVOIRS Russian patent published in 2021 - IPC E21B43/30 E21B43/16 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, namely to the development of oil deposits with low-permeability reservoirs. To implement the method for developing oil deposits with low-permeability reservoirs, previously on the territory mapped by seismic operations using the method of the general depth point of the territory, the elements of occurrence are determined - the arch, the strike line and the angle of incidence of the structure. A prospecting well is drilled at the top of a seismic uplift, after calculating the economically viable specific oil reserves for one horizontal design well, the specific area of the reservoir is determined, which provides one horizontal well with recoverable reserves. A square cell is built with an area equal to the area of the reservoir, providing recoverable reserves for one horizontal well. A grid with square cells is built with an area equal to the area of the deposit, providing recoverable reserves for one horizontal well; directional and horizontal wells are arranged. First, directional wells are drilled closest to the exploration well, then horizontal wells are drilled in the center of square cells formed by directional wells. The horizontal wellbores are placed in a perpendicular-cross direction to each other with the condition that the entry and bottom points of the horizontal wells correspond to the intersection points of the diagonals within one square cell. The bottom of the exploration well is aligned on the structure with the developed grid so that the exploration well is in the center of a square cell with horizontal wells, then by rotating around the vertical axis that passes through the location of the exploration well, the grid is oriented so that the horizontal wells are directed at an angle of 90° and 180° to the stretch line of the structure. The well pattern is completed by positioning the bottom of the directional wells to the contour of the oil-water contact.

EFFECT: invention provides an increase in the efficiency of the development of oil deposits with low-permeability reservoirs.

1 cl, 1 dwg