Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent
1997-09-10
1999-12-07
Tsay, Frank
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
175356, 175376, E21B 1008
Patent
active
059967137
ABSTRACT:
A rock bit has a body and three cutters that include generally conical surfaces, at least one of which contains an outermost, circumferential row of heel teeth that dislodge cuttings from the borehole wall and bottom. The heel teeth form a corner with the borehole wall with successive contact points defined by the path of outer edges of the heel teeth while rotating into, and prescribing, the corner as it spirals downwardly during drilling. The rotational axis of the cutter is offset from the geometric centerline or intended rotational axis of the bit. Stabilizing pads extend outwardly from the body, each concluding in a surface that contains a low-friction, wear-resistant surface that engage the wall of the borehole. The center of each surface is located directly across from the contact point of an opposed cutter.
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Isbell Matthew R.
Kenner John V.
Pessier Rudolf C. O.
Scott Danny E.
Swadi Mohammad
Baker Hughes Incorporated
Bradley James E.
Tsay Frank
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