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US 5,065,818 AGranted
Subterranean heaters
AssigneeShell Oil Company
InventorCornelis F. H. Van Egmond
Life of this patent
Estimating the term…
Abstract
An electrical resistance subterranean heater is provided which is cemented directly in a well borehole without a casing in the borehole within the zone to be heated. The absence of the casing results in an economical installation.
Claims10
A subterranean heater with a well borehole in a formation to be heated, the heater comprising:
- a) at least one electrically resistive core;
- b) mineral insulation surrounding the core;
- c) a sheath surrounding the mineral insulation;
- d) cement securing the sheath in the well borehole, wherein a casing is not present within the well borehole in the formation to be heated;
- and
- e) a means to supply electrical power through the electrically resistive core.
3 more elements
Dependencies are inferred from the claim text.