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Several factors affect drill bit selection.
Due to the high number of wells that have been drilled, using information from an adjacent well is most often used to make the appropriate selection.
Two different types of drill bits exist: fixed cutter and roller cone.
A fixed cutter bit is one where there are no moving parts, but drilling occurs due to percussion or rotation of the drill string.
Fixed cutter bits can be either polycrystalline diamond compact ( PDC ) or grit hotpressed inserts ( GHI ).
Roller cone bits can be either tungsten carbide inserts ( TCI ) or milled tooth ( MT ).
The manufacturing process and composites used in each type of drill bit make them ideal for specific drilling situations.
Additional enhancements can be made to any bit to increase the effectiveness for almost any drilling situation.

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