METHOD FOR DEVELOPING OIL DEPOSITS WITH LOW-PERMEABILITY RESERVOIRS Russian patent published in 2023 - IPC E21B43/30 

FIELD: development of oil deposits.

SUBSTANCE: invention relates to a method for developing oil deposits with low-permeability reservoirs. The method for developing an oil deposit with low-permeability reservoirs includes determining the elements of occurrence, drilling a search well on the dome of seismic uplift. After drilling logging is conducted in the exploration wells, reservoir properties of reservoirs are determined, reservoir saturation with fluids, the boundaries of water-oil contact, economically viable recoverable oil reserves are estimated per horizontal well, the area of recoverable reserves per horizontal well is determined. A square grid is built with an area equal to the area of recoverable reserves per horizontal well. A square grid is built with an area equal to the sum of the areas of nine square cells arranged in three rows along the width and length of the square grid. Eight horizontal wells are built with the length of horizontal holes equal to the length of the diagonal of one square cell. Four horizontal wells with horizontal holes are located inside a square grid, directed diagonally across a square grid and faces located in the corners of a square grid or in the corners of a square cell located in the center of a square grid. There are four horizontal wells outside a square grid with horizontal holes directed perpendicular to the square grid, and faces in the center of each side of the square grid. On the structural map, the center of the square grid is combined with the face point of the drilled prospecting well. The first row of square grids is designed along the line of stretching of the structure to the boundaries of the water-oil contact with the distance between the square grids equal to the sum of two lengths of horizontal holes. Rows of square grids are designed with a distance between the rows equal to the length of the horizontal hole. Square grids are staggered parallel to the first row until the entire structure of the deposit of the development target is filled. The square grids by 22 °30^/ are rotated counterclockwise or clockwise in the first row relative to the line of the structure, then in each subsequent row rotate the square grids by 22 °30^/ in the opposite direction relative to the square grids of the previous row.

EFFECT: present invention enables to increase the efficiency of the development of oil deposits, in the uniformity of the production of oil reserves, in high rates of extraction of reserves of low-permeable reservoirs.

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