Floating insulated conductors for heating subsurface formations
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United States of America Patent
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Jul 29, 2014
Grant Date -
Dec 31, 2009
app pub date -
Apr 18, 2008
filing date -
Apr 20, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A heating system for a subsurface formation includes a conduit located in a first opening in the subsurface formation. Three electrical conductors are located in the conduit. A return conductor is located inside the conduit. The return conductor is electrically coupled to the ends of the electrical conductors distal from the surface of the formation. Insulation is located inside the conduit. The insulation electrically insulates the three electrical conductors, the return conductor, and the conduit from each other.
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