Induction heaters used to heat subsurface formations
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United States of America Patent
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Apr 24, 2012
Grant Date -
Aug 6, 2009
app pub date -
Oct 13, 2008
filing date -
Oct 19, 2007
priority date (Note) -
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Abstract
A heating system for a subsurface formation includes an elongated electrical conductor located in the subsurface formation. The electrical conductor extends between at least a first electrical contact and a second electrical contact. A ferromagnetic conductor at least partially surrounds and at least partially extends lengthwise around the electrical conductor. The electrical conductor, when energized with time-varying electrical current, induces sufficient electrical current flow in the ferromagnetic conductor such that the ferromagnetic conductor resistively heats to a temperature of at least about 300° C.
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