Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1988-12-07
1989-09-05
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175107, 175325, E21B 402, E21B 420, E21B 728, E21B 1700
Patent
active
048629740
ABSTRACT:
A downhole drilling apparatus for use with an undergauge drill bit comprises a downhole drilling motor which includes a housing and means for rotating the drill bit relative to the housing about an axis of rotation. The apparatus also comprises stabilizers connected to the housing for stabilizing the drill bit, and it further comprises cutters connected to the housing for cutting a borehole wall created by passage of the drill bit, wherein the cutters extend radially outwardly relative to the axis of rotation to a greater extent than does the drill bit. A drilling assembly including such a drilling apparatus and a method of drilling a substantially vertical borehole in an earthen formation utilizing such an apparatus are also disclosed.
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Brett James F.
Warren Tommy M.
Winters Warren J.
Amoco Corporation
Brown Scott H.
Hook Fred E.
Novosad Stephen J.
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