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Rotary drill bits
Rotary drilling uses two types of drill bits:
- Roller-cone bits
- Fixed-cutter bits
Roller-cone bits are generally used to drill a wide variety of formations, from very soft to very hard. Milled-tooth (or steel-tooth) bits are typically used for drilling relatively soft formations. Tungsten carbide inserts bits (TCI or button bits) are used in a wider range of formations, including the hardest and most abrasive drilling applications (see Fig. 1). Fixed-cutter bits can drill an extensive array of formations at various depths, and include:
Fig. 1—Different bit types (from left to right: PDC, TCI, and milled-tooth bits).
Noteworthy papers in OnePetro
L. L. Garner 1969. New Concepts in Rotary-drilling Bits, Drilling and Production Practice, 69-148
Xiaoqing Sun 2001. A New Rock/Bit Interaction Model For Rotary Drilling Process, DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7 - 10, 2001 , Washington D.C., 01-0903
External links
See also
PEH:Introduction to Roller-Cone and Polycrystalline Diamond Drill Bits