Continuous measurement-while-drilling surveying
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United States of America Patent
Stats
-
Nov 30, 2004
Grant Date -
May 13, 2004
app pub date -
Sep 5, 2003
filing date -
Feb 23, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A continuous measurement-while-drilling surveying apparatus includes a fiber optic gyroscope sensitive to rotation about the tool spin axis of the bottom hole assembly and a second fiber optic gyroscope sensitive to rotation of the bottom hole assembly about an axis normal to the tool spin axis. The first gyroscope may be shaped as a torus to accommodate flow of drilling mud through the bottom hole assembly. The outputs of the first and second gyroscopes are processed together with acceleration signals from three accelerometers in a microprocessor which determines the orientation, velocity and position of the bottom hole assembly on a continuous basis.
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