E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/47
E21B 33/03 (2006.01) E21B 17/00 (2006.01) E21B 33/04 (2006.01) E21B 36/04 (2006.01) E21B 33/00 (2006.01)
Patent
CA 2010533
Abstract of the Disclosure An improved wellhead structure having a housing with an internal landing seat to receive the landing shoulder on a hanger having a bore with a counterbore below the bore and a shoulder between, a hanger mandrel positioned within the counterbore and having an external flange having a diameter less than the diameter of the counterbore, a first bushing positioned above the mandrel flange and in engagement with said shoulder within the hanger counterbore, a second bushing positioned within the counterbore below said mandrel flange, and a support sleeve positioned within said hanger in support- ing relationship to said second bushing, said bushings being of an electrical insulating material and sized to retain said mandrel in spaced relationship with respect to said hanger to prevent electrical connection therebetween. This structure also is used for supporting and sealing a tubing string or a section of a tubing string in a well while electrically insulating the section from the remainder of the string.
Hartmann Michael P.
Smith Jerry D.
Cooper Cameron Corporation
Smart & Biggar
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