Methods for forming long subsurface heaters
First Claim
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1. A method for forming a longitudinal subsurface heater, comprising:
- longitudinally welding an electrically conductive sheath of an insulated conductor heater along at least one longitudinal strip of metal; and
forming the longitudinal strip into a tubular around the insulated conductor heater with the insulated conductor heater welded along the inside surface of the tubular.
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Abstract
A method for forming a longitudinal subsurface heater includes longitudinally welding an electrically conductive sheath of an insulated conductor heater along at least one longitudinal strip of metal. The longitudinal strip is formed into a tubular around the insulated conductor heater with the insulated conductor heater welded along the inside surface of the tubular.
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Citations
24 Claims
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1. A method for forming a longitudinal subsurface heater, comprising:
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longitudinally welding an electrically conductive sheath of an insulated conductor heater along at least one longitudinal strip of metal; and forming the longitudinal strip into a tubular around the insulated conductor heater with the insulated conductor heater welded along the inside surface of the tubular. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for forming a longitudinal subsurface heater, comprising:
longitudinally welding an electrically conductive sheath of an insulated conductor heater along an inside surface of a metal tubular. - View Dependent Claims (9, 10, 11)
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12. A longitudinal subsurface heater, comprising:
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an insulated conductor heater, comprising; an electrical conductor; an electrical insulator at least partially surrounding the electrical conductor; and an electrically conductive sheath at least partially surrounding the electrical insulator; a metal tubular at least partially surrounding the insulated conductor heater; and wherein the sheath of the insulated conductor heater is longitudinally welded along an inside surface of the metal tubular. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for treating a subsurface formation using an electric heater, comprising:
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providing the electric heater to an opening in the subsurface formation, the electric heater comprising; an insulated conductor heater, comprising; an electrical conductor; an electrical insulator at least partially surrounding the electrical conductor; and an electrically conductive sheath at least partially surrounding the electrical insulator; a metal tubular at least partially surrounding the insulated conductor heater; wherein the sheath of the insulated conductor heater is longitudinally welded along an inside surface of the metal tubular; and heating the subsurface formation by providing electrical current to the electric heater. - View Dependent Claims (23, 24)
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Specification