Temperature limited heaters for heating subsurface formations or wellbores
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United States of America Patent
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Jun 12, 2012
Grant Date -
Jul 29, 2004
app pub date -
Oct 24, 2003
filing date -
Oct 24, 2002
priority date (Note) -
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Abstract
Systems and methods are described for heating a subsurface formation. Alternating electrical current may be applied to one or more electrical conductors. The electrical conductors may be located in a subsurface formation. The electrical conductors may provide an electrically resistive heat output upon application of the alternating electrical current. At least one of the electrical conductors may include an electrically resistive ferromagnetic material. The electrical conductor may provide a reduced amount of heat above or near a selected temperature. Heat may be allowed to transfer from the electrical conductor to a part of the subsurface formation.
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