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Inertially-stabilized magnetometer measuring apparatus for use in a borehole rotary environment

  • US 6,651,496 B2
  • Filed: 08/12/2002
  • Issued: 11/25/2003
  • Est. Priority Date: 09/04/2001
  • Status: Active Grant
First Claim
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1. A measurement apparatus for making magnetic and gravity component measurements in a borehole, including measurements made while the apparatus is rotating about the borehole axis, comprising:

  • a) a magnetic field component sensing device having at least two axes of sensitivity normal to the borehole axis and normal to each other, b) a gravity field component sensing device having at least two axes of sensitivity normal to the borehole axis and normal to each other, c) an inertial angular rotation sensing device having an axis of sensitivity along the borehole axis to sense inertial angular motion about the borehole axis, d) control, power and processing circuitry to operate said sensing devices and to process the outputs of said sensing devices to obtain stabilized component data in a coordinate system that does not rotate with the said measurement apparatus, e) and including a rotary drive mechanism, having a gimbal to support said a), b) and c) sensing devices, said rotary drive mechanism controlled by said c) inertial angular rotation sensing device, for example a gyroscope, to rotate said a) sensing device about the borehole axis, or to permit stabilization of the gimbal and the sensitive axes of said a) sensing device with respect to a fixed coordinate system, for example inertial space.

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