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Using A Downhole Turbine For Communication By Varying Speed And Blade Angle

IP.com Disclosure Number: IPCOM000126105D
Publication Date: 2005-Jun-30

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To use turbine speed variations for pulse telemetry was discussed in prior art. Disadvantage of such method is that the pressue difference of a turbine changes only very little with turbine speed. Using turbine speed variations to create pressure signals is uneffective. Novel is to use turbine speed together with blade angle variations to transmit data from a downhole to surface location of a oil drilling well. By using rotational speed control the amplitude of a signal transmitted from downhole can be controlled. The signal is modulated by changing the angle of the turbine blades. Combining both ways, it will be possible to easily modulate signals i.e. from a downhole pulser. The patent described in "Prior Art" used this method to either create sound or cancel noise. But the same principle can be used to transmit data from downhole to surface.