Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1985-05-13
1987-05-19
Novosad, Stephen J.
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
277 82, 277 83, 384 94, E21B 1022
Patent
active
046660011
ABSTRACT:
An earth boring bit having a cantilevered bearing shaft and a compensator system to equalize the pressure of the lubricant with the hydrostatic pressure of the drilling fluid surrounding the bit. A rigid face seal assembly, positioned between the cutter and bearing shaft of the bit, moves axially in response to, and to compensate for, dynamic pressure changes in the lubricant adjacent the seal. The positioning of the seal groove and seal assembly in relation to the bearing surface is such that rigid face seal movement is decreased relative to axial cutter movement during drilling to enhance seal life. Preferably the ratio of rigid ring movement to axial cutter movement is substantially one half to one.
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Felsman Robert A.
Hughes Tool Company - USA
Letchford John F.
Novosad Stephen J.
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