Drill Bit For Drilling A Borehole

A drill bit (10) for drilling a borehole comprises a bit body (12) having a bit face (20). In an embodiment, the drill bitJ10) comprises a plurality of primary blades (31,32,33) and a plurality of primary cutter elements (40) mounted to each primary blade (31,32,33) and at least one backup cutter el...

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Bibliographic Details
Main Authors CARL M HOFFMASTER, DENNIS CISNEROS, BALA DURAIRAJAN, CHARLES H S DOUGLAS
Format Patent
LanguageEnglish
Published 03.02.2010
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:A drill bit (10) for drilling a borehole comprises a bit body (12) having a bit face (20). In an embodiment, the drill bitJ10) comprises a plurality of primary blades (31,32,33) and a plurality of primary cutter elements (40) mounted to each primary blade (31,32,33) and at least one backup cutter element (50) mounted to each primary blade (31,32,33). The drill bit (10) also comprises a plurality of secondary blades (34,35,36) and a plurality of primary cutter elements (40) mounted to each secondary blade (34,35,36). The ratio of the total number of backup cutter elements (50) mounted to the plurality of primary blades (31,32,33) to the total number of backup cutter elements mounted to the plurality of secondary blades (34,35,36) is greater than 2. Each backup cutter element (50) on each primary blade (31,32,33) has substantially the same radial position as one of the primary cutter elements (40) on the same primary blade (31,32,33).
Bibliography:Application Number: GB20090013701