DRILL BIT FOR REACTIVE TURBODRILLING

摘要

FIELD: drilling the wells of large diameter by reactive turbodrilling in hard rocks. SUBSTANCE: drill bit cone teeth rows are made with similar taper angle and located in steps. Periphery teeth row has hard metal inserts with wedge-like working head whose side faces are oriented parallel to cone gaging surface and forming cones of its teeth rows. Value of displacement of teeth of the main teeth row relative to teeth of periphery teeth row does not exceed height of teeth projection. EFFECT: higher efficiency. 2 dwg