Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate
2005-12-27
2005-12-27
Tsay, Frank S. (Department: 3672)
Boring or penetrating the earth
Processes
Boring curved or redirected bores
C175S075000
Reexamination Certificate
active
06978850
ABSTRACT:
In one embodiment, a directional apparatus is disclosed for orienting and maintaining a desired orientation of a drill bit, which will be attachable to a drill string and include an asymmetrically weighted outer sleeve that is susceptible to the earth's gravity in such fashion that the side of the sleeve having a higher specific gravity will be “down” when the directional apparatus is in a segment of non-vertical wellbore. A clutch is included for transmitting a desired amount of rotational energy from a rotating drill string to a drill assembly containing the drill bit. Sensors in the sleeve and/or other elements of the apparatus detect the orientation, which may be stored in memory. The apparatus may also include one or more anti-rotational elements.
REFERENCES:
patent: 4009613 (1977-03-01), Jeter
patent: 5213168 (1993-05-01), Warren et al.
patent: 5484029 (1996-01-01), Eddison
Osha & Liang LLP
Tsay Frank S.
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