Making directional measurements using a rotating and non-rotating drilling apparatus
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United States of America Patent
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Dec 7, 2010
Issued Date -
N/A
app pub date -
Mar 1, 2007
filing date -
Apr 21, 2004
priority date (Note) -
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Abstract
A system and method to determine directional measurements for a drilling tool that at times rotates and at other times does not rotate. The method includes making a first set of measurements when the apparatus is rotating, making a second set of measurements when the apparatus is not rotating, and combining the first and second sets of measurements to obtain the directional measurements. The system includes a transmitter-receiver pair wherein the transmitter has a magnetic dipole moment parallel to a longitudinal axis of the apparatus and the receiver has a magnetic dipole moment that is tilted relative to the longitudinal axis of the apparatus, an electronics module to excite the transmitter and detect a receiver signal to make a first and second set of measurements when the apparatus is rotating and not rotating, and a processor to combine the first and second sets of measurements to obtain the directional measurements.
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Cited Art Landscape
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