Temperature limited heater with a conduit substantially electrically isolated from the formation
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United States of America Patent
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Jul 14, 2009
Grant Date -
Jan 24, 2008
app pub date -
Oct 20, 2006
filing date -
Oct 24, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
A system for heating a hydrocarbon containing formation is described. A conduit may be located in an opening in the formation. The conduit includes ferromagnetic material. An electrical conductor is positioned inside the conduit, and is electrically coupled to the conduit at or near an end portion of the conduit so that the electrical conductor and the conduit are electrically coupled in series. Electrical current flows in the electrical conductor in a substantially opposite direction to electrical current flow in the conduit during application of electrical current to the system. The flow of electrons is substantially confined to the inside of the conduit by the electromagnetic field generated from electrical current flow in the electrical conductor so that the outside surface of the conduit is at or near substantially zero potential at 25° C. The conduit may generate heat and heat the formation during application of electrical current.
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