Boring or penetrating the earth – Processes
Patent
1997-09-19
2000-10-03
Dang, Hoang
Boring or penetrating the earth
Processes
175393, E21B 1060
Patent
active
061259470
ABSTRACT:
Rotary drag bits with enhanced formation cuttings removal achieved by apportioning drilling fluid flow in relationship to cuttings volume generated by various groups of cutters on the bit, each cutter group being located on a different blade of the bit. The flow apportionment may be effected by selective placement of nozzles on the bit face, employing different sized nozzles, by varying the orientation of similarly-sized nozzles, or by a combination of approaches. In addition, the transverse cross-sectional areas of the junk slots associated with each of the various blades are sized in similar proportion to the formation cuttings volume removed by each of the cutter groups. Finally, cuttings volumes from each blade of a particular type or category, such as primary, secondary, tertiary, are substantially mutually balanced with the volumes of the other blades of the same type or category.
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Taylor, M.R., et al., High Penetration Rates and Extended Bit Life Through Revolutionary Hydraulic and Mechanical Design in PDC Drill Bit Development, SPE 36435, Society of Petroleum Engineers, Inc., 1996, pp. 191-204.
Cooley Craig H.
Trujillo William R.
Baker Hughes Incorporated
Dang Hoang
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