WELL CONSTRUCTION METHOD Russian patent published in 2013 - IPC E21B7/00 E21B43/10 

FIELD: mining.

SUBSTANCE: casing and production strings are lowered and fixed during well shaft drilling process. When the direction is being drilled, cyclic drilling of the direction and a pit is performed for a kelly drilling stem at the specified angle by means of a screw with periodic lifting of a drilling tool and extraction of drilled-out slurry. Drilled-out slurry is arranged in the form of bunds around the pit; drilling process involves a screw and drilling tool with diameter of 500 or 630 mm; pipes with diameter of 377 or 426 mm are used as the direction pipes. Casing pipe of the direction is plugged in upper part and equipped with a connection pipe; the same is equipped in its lower part with circulation holes for passage of cement grouting. Casing pipe is arranged in the well shaft so that upper part of the pipe remains above the ground level; when the casing pipe is being fixed, cement grouting is pumped to the bunded area level. Quick-setting cement grouting is used as cement grouting; the setting time of cement grouting is chosen so that it corresponds to attainment at the shrinkage of ground level.

EFFECT: reduction of well construction period.

1 dwg