Earth magnetic field measurements with electronically switched current in a source loop to track a borehole
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United States of America Patent
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Issued Date -
Mar 30, 2006
app pub date -
Jul 20, 2005
filing date -
Sep 16, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods and apparatus for precisely tracking a borehole using electronically controlled DC current switching in a source loop in the vicinity of the borehole together with measurements of the apparent Earth's magnetic field are disclosed. A field averaging method optimally gives the location of points in the borehole in the presence of intense magnetic noise. The expected uncertainty of these locations can be found from a method of generating an ensemble of simulated surveys using a noise characterization parameter found from apparent Earth field measurements. Time synchronization between apparent Earth field measurements and the instants of switching to positive current flow into the loop is found using a correlation method in conjunction with different time durations for positive and negative current flow in the source loop.
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