Flow guide actuation
First Claim
1. A method for adjusting the rotation of a turbine disposed in a through bore of drill string assembly, the through bore having at least one flow guide having a plurality of adjustable vanes disposed therein, the method comprising the steps of:
- providing a drilling fluid through said through bore, said drilling fluid flowing past said plurality of vanes and past said turbine;
positioning said plurality of vanes at a first orientation, said first orientation causing drilling fluid flowing past said plurality of vanes to have a first downwash angle proximate said turbine;
adjusting said position of said plurality of vanes to a second orientation causing said drilling fluid passing said plurality of vanes to have a second downwash angle proximate said turbine; and
wherein said rotation of said turbine is dependent upon said downwash angle proximate said turbine.
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Accused Products
Abstract
In one aspect of the present invention, a downhole drill string assembly comprises a bore there through to receive drilling fluid. A turbine may be disposed within the bore and exposed to the drilling fluid. At least one flow guide may be disposed within the bore and exposed to the drilling fluid wherein the flow guide acts to redirect the flow of the drilling fluid across the turbine. The flow guide may be adjusted by an actuator. Adjustments to the flow guide may be controlled by a downhole telemetry system, a processing unit, a control loop, or any combination thereof. In various embodiments the turbine may comprise rotatable turbine blades.
469 Citations
20 Claims
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1. A method for adjusting the rotation of a turbine disposed in a through bore of drill string assembly, the through bore having at least one flow guide having a plurality of adjustable vanes disposed therein, the method comprising the steps of:
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providing a drilling fluid through said through bore, said drilling fluid flowing past said plurality of vanes and past said turbine; positioning said plurality of vanes at a first orientation, said first orientation causing drilling fluid flowing past said plurality of vanes to have a first downwash angle proximate said turbine; adjusting said position of said plurality of vanes to a second orientation causing said drilling fluid passing said plurality of vanes to have a second downwash angle proximate said turbine; and wherein said rotation of said turbine is dependent upon said downwash angle proximate said turbine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A downhole drill string assembly comprising:
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a tubular body having a longitudinal bore adapted to receive a drilling fluid; a bore there through to receive drilling fluid; a turbine disposed within said longitudinal bore and adapted to be driven by said drilling fluid; at least one adjustable flow guide disposed within said bore, said flow guide having a plurality of adjustable vanes adapted to selectively alter a velocity of said drilling fluid proximate said turbine; and a hammer element in mechanical communication with said turbine.
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20. A downhole drill string assembly comprising:
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a tubular body having a longitudinal bore adapted to receive a drilling fluid; a bore there through to receive drilling fluid; a turbine disposed within said longitudinal bore and adapted to be driven by said drilling fluid; at least one adjustable flow guide disposed within said bore and adapted to selectively alter a velocity of said drilling fluid; and a feedback loop component in communication with said flow guide.
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Specification