DEVELOPMENT METHOD OF DEPOSITS WITH HIGH-VISCOSITY OILS AND BITUMENS BY MEANS OF SYSTEM OF HORIZONTAL INCLINED WELLS Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: inclined shafts of curved shape are drilled from vertical wells; cyclic heat treatment of formation with steam stimulation is performed, and then, extraction of formation fluids through production wells with areal stimulation of formation through injection wells is performed. According to the invention, vertical well is drilled from the mouth to the working face located below the roof of formation; from the above working face there drilled are at least 4 inclined curved shafts directed towards the formation bottom. Those shafts are drilled along spatial trajectories representing not more than a quarter of circle or parable, which lie in two vertical mutually perpendicular planes. At that, shafts are perforated throughout the length and ended in plane of horizontal production well which lies below the working face of vertical well and passes through the centre and parallel to two sides of the imaginary square that is formed with ends of inclined curved shafts. At that, as a result of hydrodynamic interaction of system of inclined injection shafts with horizontal production well there formed is formation dome drain zone for development under it of high-viscosity oils and bitumens; after that, horizontal production well is shut off and pumping of working medium to vertical well and inclined shafts is stopped.

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

2 cl, 2 ex, 2 dwg