Borehole survey method and apparatus
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United States of America Patent
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Feb 15, 2011
Grant Date -
May 14, 2009
app pub date -
Jul 8, 2008
filing date -
Nov 12, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A method includes obtaining a first set of survey data at a first point along a wellbore, estimating a present wellbore position based on at least the first set of survey data, determining a related ellipse of uncertainty at the present wellbore position, comparing the related ellipse of uncertainty of the present wellbore position to a threshold, and selecting a methodology for a subsequent survey based on a comparison of the related ellipse of uncertainty to the threshold.
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