Coupling joint for coupling insulated conductors
A fitting for coupling ends of insulated conductors includes a sleeve to couple an end of a jacket of a first insulated conductor to an end of a jacket of a second insulated conductor. The sleeve is located between end portions of the insulated conductors. At least one of the ends of the sleeve is angled relative to the longitudinal axis of the sleeve. The sleeve has a longitudinal opening that extends along the length of the sleeve substantially the distance between end portions of the jackets of the insulated conductors. The longitudinal opening allows electrically insulating material to be filled into the sleeve.
1. A method for coupling ends of two insulated conductors, comprising:
placing a sleeve over end portions of one of the two insulated conductors to be coupled;
coupling end portions of cores of the two insulated conductors that extend between the two insulated conductors;
placing the sleeve over end portions of the two insulated conductors such that the sleeve covers the coupling between the end portions of the cores, wherein at least one of the ends of the sleeve is angled relative to the longitudinal axis of the sleeve;
coupling the sleeve to jackets of the end portions of the two insulated conductors;
filling the interior of the sleeve with electrically insulating material through a longitudinal opening in the sleeve that extends along the length of the sleeve substantially the distance between the end portions of the cores; and
covering the longitudinal opening such that the electrically insulating material is contained within the sleeve.
2. The method of claim 1 , wherein both ends of the sleeve are angled relative to the longitudinal axis of the sleeve.
3. The method of claim 1 , wherein the sleeve is substantially parallelogram shaped.
4. The method of claim 1 , further comprising centering the sleeve between the end portions of the insulated conductors.
5. The method of claim 1 , further comprising coupling the end portions of the cores of the two insulated conductors by welding together the portions.
6. The method of claim 1 , further comprising coupling the sleeve to the end portions of the jackets of the two insulated conductors by welding the sleeve to the end portions.
7. The method of claim 1 , wherein the electrically insulating material comprises material substantially similar to electrical insulation in at least one of the insulated conductors.
8. The method of claim 1 , further comprising vibrating at least the sleeve during filling of the electrically insulating material into the sleeve, and applying a compressive pressure to the electrically insulating material prior to covering the longitudinal opening.
9. The method of claim 1 , further comprising installing the insulated conductors in a subsurface formation.
10. The method of claim 1 , further comprising applying electrical current to the insulated conductors, and providing heat from at least one of the insulated conductors to at least a portion of a subsurface formation.
11. The method of claim 1 , wherein the coupling joint is configured to be operable at voltages above 1000 V and temperatures at or near 700° C.