Double insulated heaters for treating subsurface formations
First Claim
Patent Images
1. A heater, comprising:
- a longitudinally continuous metallic tubular;
three insulated electrical conductors located in the longitudinally continuous metallic tubular, each of the three insulated conductors comprising an electrical conductor at least partially surrounded by an insulation layer and an electrically conductive sheath at least partially surrounding the insulation layer;
a metallic tape wrapped around the three insulated electrical conductors to hold the insulated conductors together; and
one or more layers of electrical insulation at least partially surrounding each of the three insulated electrical conductors and the metallic tape in the longitudinally continuous metallic tubular along at least one length of each of the insulated electrical conductors, the one or more layers of electrical insulation being configured to electrically isolate the insulated electrical conductors from each other and from the longitudinally continuous metallic tubular along at least one of the lengths of the insulated electrical conductors, and wherein one or more of the layers of electrical insulation are configured to withstand operating temperatures of at least about 750°
C.
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Accused Products
Abstract
A heater includes a conduit and three insulated electrical conductors located in the conduit. At least one of the three insulated conductors includes an electrical conductor at least partially surrounded by an insulation layer and an electrically conductive sheath at least partially surrounding the insulation layer. One or more layers of electrical insulation at least partially surround the three insulated electrical conductors in the conduit. The one or more layers of electrical insulation electrically isolate the insulated electrical conductors from the conduit.
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Citations
19 Claims
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1. A heater, comprising:
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a longitudinally continuous metallic tubular; three insulated electrical conductors located in the longitudinally continuous metallic tubular, each of the three insulated conductors comprising an electrical conductor at least partially surrounded by an insulation layer and an electrically conductive sheath at least partially surrounding the insulation layer; a metallic tape wrapped around the three insulated electrical conductors to hold the insulated conductors together; and one or more layers of electrical insulation at least partially surrounding each of the three insulated electrical conductors and the metallic tape in the longitudinally continuous metallic tubular along at least one length of each of the insulated electrical conductors, the one or more layers of electrical insulation being configured to electrically isolate the insulated electrical conductors from each other and from the longitudinally continuous metallic tubular along at least one of the lengths of the insulated electrical conductors, and wherein one or more of the layers of electrical insulation are configured to withstand operating temperatures of at least about 750°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for making a heater for a subsurface formation, comprising:
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wrapping a metallic tape around three insulated electrical conductors to hold the insulated conductors together; at least partially covering each of the three insulated electrical conductors and the metallic tape with one or more layers of electrical insulation along at least one length of each of the insulated electrical conductors, each of the insulated electrical conductors comprising; 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; and forming a longitudinally continuous metallic tubular around the one or more layers of electrical insulation and the three insulated electrical conductors, wherein the three insulated conductors are electrically isolated from each other and from the longitudinally continuous metallic tubular along at least one of the lengths of the insulated electrical conductors, and wherein one or more of the layers of electrical insulation are configured to withstand operating temperatures of at least about 750°
C. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for treating a subsurface formation using an electric heater, comprising:
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providing electricity to the electric heater positioned in an opening in the subsurface formation, the electric heater comprising; a longitudinally continuous metallic tubular; three insulated electrical conductors located in the longitudinally continuous metallic tubular, each of the three insulated conductors comprising an electrical conductor at least partially surrounded by an insulation layer and an electrically conductive sheath at least partially surrounding the insulation layer; a metallic tape wrapped around the three insulated electrical conductors to hold the insulated conductors together; and one or more layers of electrical insulation at least partially surrounding each of the three insulated electrical conductors and the metallic tape along at least one length of each of the insulated electrical conductors in the longitudinally continuous metallic tubular, the one or more layers of electrical insulation being configured to electrically isolate the insulated electrical conductors from each other and from the longitudinally continuous metallic tubular along at least one of the lengths of the insulated electrical conductors; and resistively heating one or more sections of one or more of the three electrical conductors; and heating the subsurface formation adjacent to the longitudinally continuous metallic tubular. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification