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Downhole navigation and detection system

  • US 7,763,845 B2
  • Filed: 08/14/2006
  • Issued: 07/27/2010
  • Est. Priority Date: 08/15/2005
  • Status: Expired due to Fees
First Claim
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1. An apparatus for evaluating an earth formation, the apparatus comprising:

  • a logging tool configured to be conveyed in a borehole in the earth formation; and

    a spinning mass gyroscope configured to provide an indication of an azimuthal orientation of the logging tool, the gyroscope including;

    (i) at least one photodiode primarily responsive to light having a wavelength less than about 440 nm, and(ii) a light source configured to have an output matched to a response curve of the at least one photodiode.

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