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Downhole turbine

  • US 7,434,634 B1
  • Filed: 11/14/2007
  • Issued: 10/14/2008
  • Est. Priority Date: 11/14/2007
  • Status: Expired due to Fees
First Claim
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1. A downhole assembly, comprising:

  • a downhole tool string component comprising a through bore adapted to pass drilling mud from a first end of the component to a second end of the component;

    a turbine assembly being disposed within the bore and in communication with a downhole electrical generator through a drive shaft;

    the generator comprises a plurality of electrically conducting coils disposed around a rotor with at least one magnetic element, which rotor is connected to the driveshaft;

    the generator comprises a characteristic of having a range of rotor rotational velocity to which the generator produces an optimal amount of power;

    the turbine assembly comprises an overall characteristic which causes the turbine assembly to stall when engaged by drilling mud at a turbine rotational velocity which causes the rotor to exceed a maximum rotational velocity of the range.

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