Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1985-07-12
1988-01-12
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175410, E21B 1052
Patent
active
047185058
ABSTRACT:
A rotary drill bit for use in drilling or coring deep holes in subsurface formations comprises a bit body having a shank for connection to a drill string and a plurality of cutting elements mounted at the surface of the bit body. Each cutting element is bonded to a stud which is received in a socket in the bit body. Spaced rearwardly of each cutting element is a separate abrasion element comprising a stud which is received in a socket in the bit body and is impregnated with particles of natural or synthetic diamond. The abrasion element provides a back-up in the event of failure or excessive wear of the cutting element and its spacing from the cutting element prevents the damaging transfer of heat from the abrasion element to the cutting element. The cooling may be enhanced by providing a channel for drilling fluid between the cutting element and abrasion element.
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Diamax and Services ad, World Oil, Feb. 15, 1982, p. 250-C.
1982-1983 Composite Catalog of Oil Field Equipment & Services, vol. 2, pp. 2430, 2431, 2451 and 2452, Gulf Publishing Company.
"Optimisation of Radial Distribution of Stratapax.TM. (T1) Cutters in Rock Drilling Bits," by John D. Barr, Energy-Sources Technology Conference, New Orleans, Feb. 1980, ASME, Petroleum Division.
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Anderson Margaret
Leppink James A.
Melius Terry Lee
NL Petroleum Products Limited
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