core bit

Among the tools needed for less-costly scientific superdeep drilling and sampling are long-life hard-rock drill and core bits; special core drilling technology for recovering a significant percentage of core; the use of hollow shaft downhole drilling and coring motors for improved core recovery, increased penetration rates, and reduced fatigue and stress in long drill strings; advanced automation for drill pipe handling and tripping equipment; improved methods for borehole trajectory control; more sensitive monitors placed near the bit for early deviation detection, and downhole instruments to monitor core and drill bit performance.

These items include Cheetah-2, Green Giant, T-SEG Signature 15 (all saw-blade models), and Pro Core Bits-wet which is a professional grade core bits model.

The Devico steerable core barrel has two eccentric bearings which can displace the inner barrel and its attached core bit to give a maximum deviation of up to 1.5 [degrees] in 1 m.