Temperature limited heaters with thermally conductive fluid used to heat subsurface formations
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United States of America Patent
Stats
-
Jun 10, 2008
Grant Date -
Dec 8, 2005
app pub date -
Apr 22, 2005
filing date -
Apr 23, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Certain embodiments provide a system including a heater. The heater includes one or more electrical conductors. The heater is configured to generate a heat output during application of electrical current to the heater. The heater includes a ferromagnetic material. A conduit at least partially surrounds the heater. A fluid is located in a space between the heater and the conduit. The fluid has a higher thermal conductivity than air at standard temperature and pressure (STP) (0.degree. C. and 101.325 kPa). The system is configured to provide (a) a first heat output below a selected temperature when time-varying electrical current is applied to the heater, and (b) a second heat output near or above the selected temperature when time-varying electrical current is applied to the heater.
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- Non-US Classification not provided for expired patents
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Patent Citation Ranking
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