Downhole turbine
AssigneeSchlumberger Technology Corporation
InventorsDavid R. Hall, Scott Dahlgren, Jonathan Marshall
Life of this patent
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Abstract
In one aspect of the present invention, a drill bit has a jack element that is substantially coaxial with an axis of rotation of the drill bit and the jack element has an asymmetrical distal end that extends beyond a working face of the drill bit. A turbine is located within a bore formed in the drill bit and a flow valve is actuated by the turbine. The flow valve is adapted to route a drilling fluid in the bore into a porting mechanism adapted to extend the jack element farther beyond the working surface of the drill bit. The turbine is also adapted to rotate the jack element at variable speeds.
Claims18
A drill bit, comprising;
- a jack element substantially coaxial with an axis of rotation of the drill bit, the jack element comprises an asymmetrical distal end extending beyond a working face of the drill bit;
- a turbine located within a bore formed in the drill bit;
- a flow valve actuated by the turbine being adapted to route a drilling fluid in the bore into a porting mechanism adapted to extend the jack element farther beyond the working surface of the drill bit;
- and
- the turbine being adapted to rotate the jack element at variable speeds.
A method for steering a drill bit through a formation, comprising the steps of
- providing a jack element substantially coaxial with an axis of rotation of the drill bit, the jack element comprises an asymmetrical distal end extending beyond a working face of the drill bit, a turbine located within a bore formed in the drill bit and adapted to rotate the jack element at variable speeds, a porting mechanism adapted to extend the jack element farther beyond the working surface of the drill bit, and a flow valve actuated by the turbine;
- directing a drilling fluid flow across the turbine;
- actuating a flow valve such that the drilling fluid is directed into the porting mechanism;
- extending the jack element and the asymmetrical tip of the jack element farther beyond the working surface of the drill bit;
- and
- rotating the asymmetrical tip of the jack element to a desired orientation.
Dependencies are inferred from the claim text.