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US 6,269,876 B1Granted
Electrical heater
AssigneeShell Oil Company
InventorsEric De Rouffignac, Harold J. Vinegar, Lawrence James Bielamowicz
Life of this patent
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Abstract
A heater is disclosed, the heater including: a porous metal sheet heating element; and an electrical insulating material surrounding the porous metal sheet heating element; wherein there is no casing surrounding the porous metal sheet heating element.
Claims14
A wellbore heater comprising:
- a porous metal sheet heating element, the porous metal sheet being an electrical resistance heating element;
- and
- an electrical insulating material surrounding the porous metal sheet heating element;
- wherein there is no casing surrounding the porous metal sheet heating element.
1 more element
A method to heat a portion of the earth, the method comprising the steps of:
- providing a borehole within the portion of the earth to be heated;
- placing an electrical resistance heating element within the borehole, the heating element being a porous metal sheet element;
- and
- supporting the heating element within the borehole with electrically insulating material, wherein a metal casing is not provided between the heating element and the earth to be heated.
1 more element
Dependencies are inferred from the claim text.