Elongated coil assembly for electromagnetic borehole surveying
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United States of America Patent
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Issued Date -
Sep 29, 2005
app pub date -
Aug 16, 2004
filing date -
Mar 24, 2004
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Abstract
An apparatus and method for surveying the path of a borehole includes three single-axis electromagnetic field sensors and three single axis gravity direction sensors in the borehole being surveyed. A pair of closely spaced, parallel guide wires carrying oppositely directed electric current in a reference borehole generate a known electromagnetic field, which is detected by the sensors. Mathematical analysis of electromagnetic and gravity measurements determines the lateral location and the direction of drilling in the neighboring borehole.
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