Changeover bit for extended life, varied formations and steady w

Details Changeover bit for extended life, varied formations and steady w Changeover bit for extended life, varied formations and steady w

1986-03-14

1987-09-01

Novosad, Stephen J.

Boring or penetrating the earth

Automatic control

175 39, 175342, 175379, 175382, E21B 1020, E21B 1062, E21B 4400

Patent

active

046902287

ABSTRACT:
A roller cone bit may be used as a rotating drag bit by treating the roller cones as carriers for a plurality of distinguishable types of drag cutters. The roller cones are each coupled to a mechanism which selectively allows rotation of the roller cones. The roller cones are otherwise fixed and as the bit is rotated, the drag cutters are brought into engagement with the rock. However, where the roller cones are selectively allowed to rotate, rotation of the drag bit rotates the roller cones to bring a second set of drag cutters into a configuration for cutting the rock formation. A mechanism then selectively locks the roller cones to prevent further rotation, keeping the second set of drag cutters fixed in place. By selectively permitting and preventing rotation of the roller cones, a plurality of sets of drag cutters can be brought into a configuration for cutting the rock. Such a drag bit may be employed to bring drag cutters selectively into play to cut different types of rock formation, or to present renewed cutters after an initial set of cutters have been worn by a predetermined degree. Furthermore, rotation of the roller cones may be slowed by application of a drag to each roller cone. The drag cutters on each roller cone will be sequentially brought into a cutting configuration with respect to the rock and wear will be evenly distributed among the drag cutters.

REFERENCES:
patent: 1029491 (1912-06-01), Cortinas
patent: 1716741 (1929-06-01), Schwafel
patent: 2275832 (1942-03-01), Zublin
patent: 3847236 (1974-11-01), Coalson
patent: 3862665 (1975-01-01), Wallace
patent: 4386669 (1983-06-01), Evans

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