METHOD OF COMBINED LASER-MECHANICAL DRILLING OF SILICA-CONTAINING MATERIALS Russian patent published in 2014 - IPC E21B7/14 E21C37/18 

FIELD: construction.

SUBSTANCE: to drill holes in concrete buildings for the purpose to strengthen them with braces and in dangerous vertical sections of the rock, to drill thin diagnostic deep holes in multi-metre concrete walls of burial grounds with buried radioactive substances, for drilling of local side holes in the wall of the well, drilling in surrounding rock is carried out cyclically. In each cycle of drilling the hole bottom is exposed to serial alternation of thermal and mechanical actions, namely, in the following sequence: laser radiation, cooling by coolant, mechanical grinding of a layer of weakened material on it and forced removal of sludge from the bottomhole area, afterwards the cycles of drilling are repeated to achieve the specified depth of the hole.

EFFECT: increased efficiency of hole drilling.

3 cl, 4 dwg