Electric resistance heating devices – Heating devices – Borehole type
Reexamination Certificate
2006-04-21
2010-12-28
Campbell, Thor S (Department: 3742)
Electric resistance heating devices
Heating devices
Borehole type
C029S860000, C166S302000
Reexamination Certificate
active
07860377
ABSTRACT:
A system for heating a subsurface formation is described. The system includes a first elongated heater in a first opening in the formation. The first elongated heater includes an exposed metal section in a portion of the first opening. The portion is below a layer of the formation to be heated. The exposed metal section is exposed to the formation. A second elongated heater is in a second opening in the formation. The second opening connects to the first opening at or near the portion of the first opening below the layer to be heated. At least a portion of an exposed metal section of the second elongated heater is electrically coupled to at least a portion of the exposed metal section of the first elongated heater in the portion of the first opening below the layer to be heated.
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Bass Ronald Marshall
Carl, Jr. Frederick Gordon
Keltner Thomas Joseph
Kim Dong Sub
Mason Stanley Leroy
Campbell Thor S
Shell Oil Company
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