DEVELOPMENT METHOD OF DEPOSITS WITH HIGH-VISCOSITY OILS BY MEANS OF SYSTEM OF HORIZONTAL INCLINED WELLS Russian patent published in 2014 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: inclined shafts of curved shape are drilled from vertical wells; at the initial stage of development a cyclic heat treatment of a formation with steam stimulation is performed, and then, extraction of formation fluids through production wells with areal stimulation of the formation through injection wells is performed. According to the invention at least vertical inclined wells are drilled from the head to the bottomhole placed above or below the bed roof and inclined curved holes directed towards the bed bottom are drilled from there along the space trajectories representing less than one fourth of a circle or parabola lying in two vertical mutually perpendicular planes. At that the holes are perforated along the whole oil-saturated thickness of the bed. The upper perforation interval shall be placed at a distance of at least 10m in vertical from the horizontal injection well, which lies below the bed roof and passes through the centre and in parallel to two sides of the conceptual quadrate formed by heads of the vertical pilot holes. Whereat in result of hydrodynamic interaction of the inclined producer system with the horizontal injection well the bed drainage area is formed.

EFFECT: increasing production rate in thick non-homogeneous formations with high-viscosity oils.

2 cl, 2 ex, 2 dwg