METHOD OF DRILLING COMPENSATION WELLS Russian patent published in 2017 - IPC E21B7/28 E21B10/26 

FIELD: drilling equipment.

SUBSTANCE: invention relates to drilling equipment, namely to methods of drilling. Method of drilling of compensation blast holes (wells) involves use of bit with expanding part, in front part of which guide centralizer is used. Drilling of compensation well is carried out in single step, wherein on expanding part with diameter D as guide centralizer projects bit of smaller diameter d in relation to diameter D, which is put on outer cone in front part of expanding part of bit, said cone is made integral with expanding part. Rock cutting elements on both pilot bit, and on expanding part have pin shape. Side surface of expanding part of bit has shapesimilar to shape of petals of lotus flower with radius of curvature. Concave slots for removal of broken slurry on expanding part have radial cylindrical surface.

EFFECT: technical result consists in improvement of drilling efficiency of compensation blast holes and wells in single step.

1 cl, 13 dwg