| 摘要 |
There is described an insulating connector for the wellhead of an electrode well used for heating a subsurface formation by electrical power dissipation in the formation. The insulating connector has two iron base metal fittings (for example, steel flange halves) heat shrink fitted to a piece of ceramic pipe with a nonferrous second metal between the outer surface of the ceramic and the inner surface of the metal fittings. The nonferrous metal (for example, copper) has a lower yield than steel and a higher thermal expansion coefficient than the iron base metal and deforms, compensates and distributes the stresses caused in the shrink fitted members by the differences expansion between steel and ceramics. Other features which improve the quality and control of various parameters affecting the heat shrink fit insulating connector include the amount of interference required per inch of outside diameter of the ceramic member, length of interference surface relative to the outside diameter of the ceramic member, matching slightly tapered mating surfaces, bevelling the outside surface of the overlapping inner end of the metal members, and using a ceramic member with a flow passage larger than the flow passage through the metal members.
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