Electric resistance heating devices – Heating devices – Borehole type
Reexamination Certificate
2006-04-21
2010-11-09
Campbell, Thor S (Department: 3742)
Electric resistance heating devices
Heating devices
Borehole type
C166S302000
Reexamination Certificate
active
07831133
ABSTRACT:
A heating system for a subsurface formation is described. The heating system includes a first heater, a second heater, and a third heater placed in an opening in the subsurface formation. Each heater includes: an electrical conductor; an insulation layer at least partially surrounding the electrical conductor; and an electrically conductive sheath at least partially surrounding the insulation layer. The electrical conductor is electrically coupled to the sheath at a lower end portion of the heater. The lower end portion is the portion of the heater distal from a surface of the opening. The first heater, the second heater, and the third heater are electrically coupled at the lower end portions of the heaters. The first heater, the second heater, and the third heater are configured to be electrically coupled in a three-phase wye configuration.
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Sandberg Chester Ledlie
Vinegar Harold J.
Campbell Thor S
Shell Oil Company
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