THERMAL-MECHANICAL DRILLING METHOD AND DEVICE Russian patent published in 2005 - IPC

FIELD: mining, particularly for drilling bores with core recovery or without core recovery.

SUBSTANCE: method involves frictional heating of rock surface layer; separating above layer by cutting and removing the cuttings with flushing liquid. One half of face section corresponding to annular strip with width equal to half of face width is heated by frictional member rubbing. Another half thereof is cooled with flushing liquid. Outer and inner face parts are alternately heated and cooled. Thermal-mechanical drilling device comprises body, frictional members adapted to weaken rock surface layer by heating thereof, cutters and radial channels for flushing liquid. Frictional members and cutters are divided into downhole and core treating sections and have outlines defined in radial sections thereof in face contact area, which coincide with each other in overlapped manner. Non-working faces of frictional members and face form annular channels connected with radial channels for flushing liquid.

EFFECT: increased operational reliability and drilling efficiency.

4 cl, 8 dwg, 1 ex