Wells – With heating – refrigerating or heat insulating means – Electrical heater in well
Reexamination Certificate
2008-06-10
2008-06-10
Kreck, John (Department: 3672)
Wells
With heating, refrigerating or heat insulating means
Electrical heater in well
C166S302000, C192S111400
Reexamination Certificate
active
07383877
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° 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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Harris Christopher Kelvin
Vinegar Harold J.
Kreck John
Shell Oil Company
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