Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent
1979-04-09
1981-01-27
Leppink, James A.
Boring or penetrating the earth
Bit or bit element
Magnetized or with magnet
175393, 175410, E21B 902, E21B 936
Patent
active
042469775
ABSTRACT:
A diamond studded insert drag bit is disclosed having a multiplicity of individual diamond insert cutter blanks inserted in the face of the bit. The diamond insert blanks are so positioned to maximize penetration of the bit in a borehole. The bit further includes fluid passages strategically located in the bit face to provide uniform flow, cooling and continuous cleaning of each of the diamond cutter insert blanks. The fluid passages are so sized to cause minimum bit pressure drop. Bits with minimum pressure losses from fluid flow are best suited for positive displacement mud motors that cannot tolerate downstream pressures in excess of 50 to 500 pounds per square inch.
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patent: 2966949 (1961-01-01), Wepsala, Jr.
patent: 3106973 (1963-10-01), Christensen
patent: 3269470 (1966-08-01), Kelly, Jr.
patent: 3871488 (1975-03-01), Sabre
patent: 4073354 (1978-02-01), Rowley et al.
patent: 4098363 (1978-07-01), Rohde et al.
Leppink James A.
Smith International Inc.
Upton Robert G.
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