METHOD FOR DEVELOPMENT OF A MULTI-LAYER OIL FIELD Russian patent published in 2022 - IPC E21B43/14 E21B43/30 

FIELD: oil industry.

SUBSTANCE: invention relates to the field of the oil industry and can be used for the development of multi-layer oil fields with the simultaneous commissioning of several development objects. The method includes compaction of the grid of wells of the upper development object, simultaneous and separate injection of the working agent into the lower and upper objects, oil extraction through producing wells. Previously, on the territory mapped for seismic works, the dip and strike are determined using the method for a common depth point: the roof, the strike line and the angle of incidence of the structure, a search well is drilled on the roof of seismic uplift, core is taken from the lower and upper development sites and oil recovery factors are determined, the ORF of the lower and upper development objects, with the ORF of the lower development object exceeding the ORF of the upper development object 1.5 or more times, the area of economically viable specific oil reserves per horizontal well of the upper development object is calculated, the specific area of the deposit providing recoverable reserves to one horizontal well is determined, then the square cell area of the joint design grid for lower and upper development objects is calculated. A square cell of the joint design grid on the lower and upper development objects, then a grid with square cells of the joint design grid is built with an area equal to the area of the lower development object, the grid of wells of the upper development object with horizontal wells is sealed, while first drilling obliquely directed wells with the opening of the lower development object closest to the exploration well, then horizontal wells in the center of square cells on the upper object formed by obliquely directed wells, and the trunks of horizontal wells are arranged in a perpendicular-cross direction to each other with the condition that the entry points and the bottom of horizontal wells correspond to the points of intersection of diagonals inside one square cell, the bottom of the exploration well on the structure with the developed grid is combined so that the exploration well is located in the center of a square cell with horizontal wells, then rotating around a vertical axis, which passes through the location of the exploration well, the grid is oriented so that the trunks of horizontal wells are directed at angles of 90° and 180° to the line of extension of the structure of the upper development object, the grid of wells is completed with the location of the bottoms of obliquely directed wells to the contour of the water-oil contact.

EFFECT: proposed method increases the efficiency of the development of a multi–layer oil field with the maintenance of high rates of extraction of recoverable reserves while simultaneously commissioning several, upper and lower, development facilities with different ORF values (with the ORF of the lower, underlying object exceeding the ORF of the upper, overlying one 1.5 or more times).

1 cl, 1 dwg