DEVELOPMENT OF OIL DEPOSITS BY HORIZONTAL WELLS Russian patent published in 2014 - IPC E21B43/16 E21B43/26 

FIELD: oil-and-gas industry.

SUBSTANCE: proposed method comprises drilling of prospect holes with recovery of cores and filed is developed by drilling horizontal wells. In compliance with this invention, prospect hole drilling in productive interval is performed with oriented recovery of core to define azimuthal direction of minimum stresses in collector bed. Collector bed depth is defined to develop the field by horizontal holes. Drilling of said horizontal boreholes in collector bed is made with the help of geo control over borehole trajectory. Note here that in 1-10 m-thick collector beds, horizontal holes are drilled in azimuthal direction perpendicular to that of minimum stresses in bed. Note here that in 10-100 m-thick collector beds, horizontal holes are drilled in azimuthal direction parallel with that of minimum stresses in bed. Hydro frac is performed in oil wells. In 1-10 m-thick collector beds hydro frac is performed to make a fracture with plane directed along well horizontal section. Note here that in 10-100 m-thick collector beds, repeated hydro frac is performed to make fractures with their planes perpendicular to borehole horizontal section on the basis of one fracture per every 100 m of borehole horizontal section.

EFFECT: higher efficiency.

4 ex, 2 dwg