Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1995-03-03
1996-01-23
Dang, Hoang C.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 73, E21B 704
Patent
active
054858895
ABSTRACT:
A drilling system for controlling steering of a downhole drilling tool 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 system 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. The system for rotating and halting this slow rotation comprises a downhole swivel coupling between the drilling tool and the drill string so that torque from the drill bit tends to rotate the drilling tool in the opposite direction. A control device is provided to restrict the amount of torque communicated through the swivel coupling and to halt the swivel coupling as required to control the steering of the drill bit.
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excerpt from Oilweek--Aug. 2,1976 (2 pages).
clipping from The Roughneck--Jul. 1976.
clipping from newspaper entitled "Idea of oilman Ben Gray".
clipping from Edmonton Journal--Aug. 22, 1978.
Battison Adrian D.
Dang Hoang C.
Sidekick Tools Inc.
Thrift Murray E.
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