Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Reexamination Certificate
2007-12-11
2007-12-11
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
Shaft carried guide or protector
C175S026000, C175S061000, C175S076000
Reexamination Certificate
active
11405353
ABSTRACT:
The present invention provides a drilling assembly for drilling deviated wellbores. The drilling assembly includes a drill bit at the lower end of the drilling assembly. A drilling motor provides the rotary power to the drill bit. A bearing assembly of the drilling motor provides lateral and axial support to the drill shaft connected to the drill bit. A steering device is integrated into drilling motor assembly. The steering device contains a plurality of force application members disposed at an outer surface of the drilling motor assembly. Each force application member is adapted to move between a normal position and a radially extended position to exert force on the wellbore interior when in extended position. A power unit in the housing provides pressurized fluid to the force application members. A control device for independently operating each of the force application members is disposed in the drilling motor assembly. A control circuit or unit independently controls the operation of the control device to independently control each force application member. For short radius drilling, a knuckle joint is disposed uphole of the steering device to provide a bend in the drilling assembly. During drilling of a wellbore, the force application members are operated to adjust the force on the wellbore to drill the wellbore in the desired direction.
REFERENCES:
patent: 5419405 (1995-05-01), Patton
patent: 6047784 (2000-04-01), Dorel
patent: 6206108 (2001-03-01), MacDonald et al.
patent: 6244361 (2001-06-01), Comeau et al.
Faber Hans-Juergen
Freyer Carsten
Krueger Volker
Kruspe Thomas
Baker Hughes Incorporated
Madan Mossman & Sriram P.C.
Tsay Frank
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