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Integrated modulator and turbine-generator for a measurement while drilling tool

  • US 5,517,464 A
  • Filed: 05/04/1994
  • Issued: 05/14/1996
  • Est. Priority Date: 05/04/1994
  • Status: Expired due to Term
First Claim
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1. An apparatus for use in a borehole having borehole fluid flowing therethrough, said apparatus comprising:

  • a) a tool housing having an open end for receiving the borehole fluid;

    b) a drive shaft mounted for rotation in said housing;

    c) a turbine impeller mechanically coupled to said drive shaft such that the flowing borehole fluid causes said turbine impeller to rotate;

    d) a modulator rotor mechanically coupled to said drive shaft such that rotation of said turbine impeller causes said modulator rotor to rotate;

    e) a modulator stator mounted in said housing adjacent said modulator rotor such that rotation of said modulator rotor relative to said modulator stator creates pressure pulses in the borehole fluid; and

    f) a controllable braking means for selectively braking rotation of said modulator rotor to modulate said pressure pulses.

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