ROTARY TURBODRILLING METHOD AND DEVICE Russian patent published in 2006 - IPC E21B7/00 E02D17/00 

FIELD: mining, particularly special methods or apparatus for drilling, for water-tight screen forming and large well drilling during hydraulic mineral production, for retaining wall construction in ground and for foundation building.

SUBSTANCE: device comprises working tool made as turbodrills with rock-cutting tips. The turbodrills are connected one to another and constitute linear row. The working tool is also provided with central member including outer pipe and inner column. Each turbodrill comprises spindle. Auger or helical sections are coaxially installed on spindle of each turbodrill and on inner column of central member. Sealing member and branch pipe are located in upper part of outer pipe. The branch pipe is adapted to be connected to vacuum plant. Pressure pipelines are installed on frame between turbodrills with auger or helical sections. The pressure pipelines are provided with hydraulic heads entering well bottom zone. Method involves rotating auger or helical sections coaxially installed on turbodrill spindles and inner column to clean well bottom of cut rock; supplying flushing liquid to well bottom zone via pressure pipelines provided with hydraulic heads, wherein the pipelines are arranged between turbodrills having auger or helical sections; widening central mine part by installing inertia or foldable reamer on central member, which is arranged in advance of rock-cutting tips connected to turbodrills; evacuating upper part of pipe string of central member.

EFFECT: improved well bottom zone cleaning of cut rock during well drilling and, as a result, increased mechanical and run drilling speed and reliability.

2 cl, 1 dwg