FIELD: oil and gas industry.
SUBSTANCE: there is proposed head for drilling a hole, which includes support element with longitudinal pass, annular bit which moves away from support element, a slot passing from distal end of the bit between its internal and external surfaces longitudinally towards proximal end of the bit. Slot is restricted with the first side wall, the second side wall located opposite the first wall in circumferential direction, and its proximal wall passing between the first and the second walls opposite distal end of the bit. Strengthening element passes across the slot in circumferential direction between the first and the second walls of the slot. Slot includes proximal segment passing between the strengthening element and proximal wall of the wall, and distal segment passing between the strengthening element and distal end of the bit.
EFFECT: increasing drilling process efficiency.
20 cl, 18 dwg
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