METHOD OF HORIZONTAL OIL WELL CONSTRUCTION Russian patent published in 2014 - IPC E21B7/04 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: at construction of a horizontal oil well construction drilling of a vertical wellbore is done through rocks, including unstable clay rocks with entry to a productive formation, running-in of the production casing up to the productive formation, cementing of a borehole annulus and drilling of a horizontal offshoot from the production string. Running-in of a shank with length from the bottomhole up to the depth of unstable clay rocks not less than 50 m, cementing space behind the shank, perforation of the horizontal borehole and hydraulic fracturing in the horizontal borehole with placement of a hydraulic fracturing arrangement in the production string and setting of the packer for hydraulic fracturing and tubing string shoe in the production string over the shank is carried out.

EFFECT: increase of well productivity.

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