METHOD FOR DEVELOPMENT OF OIL DEPOSITS BY SYSTEM OF VERTICAL AND HORIZONTAL WELLS Russian patent published in 2021 - IPC E21B43/30 E21B43/14 

FIELD: oil industry.

SUBSTANCE: method for developing oil deposits with a system of vertical and horizontal wells is claimed. The method includes sequential drilling of the reservoir with vertical, directional and horizontal wells along a grid. Application of equipment for simultaneous-separate operation, selection of products from wells. The grid of wells is formed from elements, each element consists of one central vertical or directional production well, from which, within a radius of R₁=S=250-500 m, six points are placed with a distance S between each other - the entry points into the formation of the I row wells. Then, from the central well, a contour of a circle with a radius of R₂=2S is placed, at the intersections of this contour of a circle R₂ with the contours of circles with a radius of S from the entry points into the formation of wells of the I row, bottom-hole points of the I row of wells are obtained, connecting the corresponding entry points into the formation and the bottom-hole of wells I row receive six horizontal production wells I row of lengths S boreholes. From the central well to the points obtained at the intersection of the circles constructed from the entry points of the I row wells into the formation, the line is drawn in the radial direction. At the intersection of these lines with the contour of the circle R₂, the location of the entry points into the formation of six vertical and/or directional injection wells of the II row is obtained. A contour of a circle with a radius of R₃=3S is placed from the central well, a projection of the directions of the boreholes of horizontal wells of the I row is carried out to the contour of a circle R₃ and intersection points are obtained, at which, in turn, contours with a radius S are drawn and at the intersections of these contours of circles with a radius S with a contour of a circle R₃ points, the most closely spaced of which are connected, and six horizontal production wells of III row with lengths S of boreholes are obtained. At the intersection of the projections of the directions of the boreholes of horizontal wells of the III row, the entry points into the formation of six vertical and/or directional injection wells of the III row are obtained. In accordance with the obtained element diagram, the central well and all wells of the I, II and III rows are drilled. Similarly, the remaining elements are drilled on the deposit, and the III row of wells of each element is common for adjacent elements.

EFFECT: increased oil recovery of oil deposits.

1 cl, 10 dwg