Varying properties along lengths of temperature limited heaters
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United States of America Patent
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Jul 26, 2011
Grant Date -
Mar 1, 2007
app pub date -
Apr 21, 2006
filing date -
Apr 22, 2005
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system for heating a subsurface formation is described. The system includes an elongated heater in an opening in the formation. The elongated heater includes two or more portions along the length of the heater that have different power outputs. At least one portion of the elongated heater includes at least one temperature limited portion with at least one selected temperature at which the portion provides a reduced heat output. The heater is configured to provide heat to the formation with the different power outputs. The heater is configured so that the heater heats one or more portions of the formation at one or more selected heating rates.
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