Temperature limited heaters using phase transformation of ferromagnetic material
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United States of America Patent
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Oct 6, 2009
Grant Date -
Feb 14, 2008
app pub date -
Apr 20, 2007
filing date -
Apr 21, 2006
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Abstract
Systems, methods, and heaters for treating a subsurface formation are described herein. Systems and methods for making heaters are described herein. At least one heater includes a ferromagnetic conductor and an electrical conductor. The electrical conductor is electrically coupled to the ferromagnetic conductor. The heater provides a first amount of heat at a lower temperature. The heater may provide a second reduced amount of heat when the heater reaches a selected temperature, or enters a selected temperature range, at which the ferromagnetic conductor undergoes a phase transformation.
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