Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent
1998-01-09
2000-05-09
Lillis, Eileen Dunn
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
188180, E21B 704
Patent
active
060590505
ABSTRACT:
An apparatus for controlling rotation of an outer sleeve member relative to an inner cylindrical duct member is used in a drilling system for controlling steering of a downhole drilling tool. The apparatus includes an annular swash plate pump and a stack of annular brake disks in the space between the members. The pump is driven by the rotation to pump fluid into a supply cylinder driving the brake. An orifice controls escape of the fluid from the chamber at a controlled rate. The rate is controlled to maintain a balance between the pumping rate and the brake pressure to keep the rotation at a required rate. The apparatus is used in the drilling system which includes a shallow bend in the drilling tool and a system for rotating the bent drilling tool slowly about a longitudinal axis of the drilling tool while the drill bit rotates more rapidly. The controlled orifice further allows the slow rotation to be halted at a predetermined orientation of the bend axis so as to effect a change in drilling direction.
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Battison Adrian D.
Cho Chong S.
Lillis Eileen Dunn
Sidekick Tools Inc.
Thrift Murray E.
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