Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent
1995-01-09
1997-06-24
Schoeppel, Roger J.
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
175323, 175385, 175394, E21B 400
Patent
active
056410271
ABSTRACT:
A drilling system employs spaced apart cutting members arranged in a helical pattern to form a helical thread within a rock bore. The thread is efficiently fragmented by a wedge-shaped trailing cutting member. Advantageously, a substantial portion of the rock is removed by the fracturing of the internal thread in the rock bore by the uppermost cutting member, taking advantage of the weakness of rock in tension. The rotational speed of the helical cutting system may be controlled as a function of the axial thrust applied to a pilot bit located in front of the helical cutting system.
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Schoeppel Roger J.
UTD Incorporated
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