Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Patent
1995-10-03
1997-07-22
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
E21B 1046
Patent
active
056496044
ABSTRACT:
A rotary drill bit comprises a bit body having a shank for connection to a drill string, a plurality of cutters mounted on the bit body, each cutter having a cutting face, and means for supplying drilling fluid to the surface of the bit body to cool and clean the cutters. At least some of the cutters are lateral cutters located to act sideways on the formation being drilled, and the cutting faces of such lateral cutters are orientated to exhibit negative side rake and negative top rake with respect to the surface of the formation. The negative side rake angle is greater than 20.degree. and may be as much as 90.degree., and the negative top rake angle is also more than 20.degree.. A single cutter may include two cutting faces at different negative side rake angles, e.g. the cutter may comprise a generally cylindrical substrate formed at one end with two oppositely inclined surfaces meeting along a ridge, a facing table of polycrystalline diamond being bonded to the substrate surfaces and extending over the ridge.
REFERENCES:
patent: 4244432 (1981-01-01), Rowley et al.
patent: 4351401 (1982-09-01), Fielder
patent: 4819516 (1989-04-01), Dennis
patent: 4858707 (1989-08-01), Jone et al.
patent: 4932484 (1990-06-01), Warren et al.
patent: 4942933 (1990-07-01), Barr et al.
patent: 5119892 (1992-06-01), Clegg et al.
patent: 5282513 (1994-02-01), Jones
patent: 5303785 (1994-04-01), Duke
patent: 5531281 (1996-07-01), Murdock
Fuller John M.
Murdock Andrew
Camco Drilling Group Limited
Tsay Frank
LandOfFree
Rotary drill bits does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotary drill bits, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotary drill bits will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1554800