Boring or penetrating the earth – Natural vibration characteristic of an element of boring...
Reexamination Certificate
2006-02-14
2006-02-14
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Natural vibration characteristic of an element of boring...
C175S024000, C175S325200
Reexamination Certificate
active
06997271
ABSTRACT:
The present invention provides a torsional energy control assembly and method for eliminating slip-stick and/or drill bit oscillations comprising axial and/or rotational oscillations. In one preferred embodiment, the assembly permits slippage between an upper portion of the drilling string and a lower portion of a drill string. The rotational control assembly may be installed at any desired position in the drill string. The rotational control assembly could also be utilized as a component of other drilling mechanisms such as a downhole drilling motor. The rotational control permits slippage while drilling for a selected time or selected rotational distance or other criteria to thereby release torsional energy in the drilling string which otherwise may produce damaging slip-stick torsional oscillations such as slip-stick. The rotational control assembly may, in one embodiment, comprise an on-off clutch whereby torque is either substantially completely transmitted or substantially not transmitted through the assembly for brief periods.
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Nichols Richard A.
Palmer Larry G.
Taylor Bruce L.
Bagnell David
Nash Kenneth L.
Stephenson Daniel P
Strataloc Technology Products LLC
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