Pipe joints or couplings – Pipe to discreet nipple or sleeve to plate – Nipple sealed to plate
Patent
1989-02-06
1990-04-24
Kisliuk, Bruce M.
Pipe joints or couplings
Pipe to discreet nipple or sleeve to plate
Nipple sealed to plate
205143, 166 751, 166208, E21B 3304
Patent
active
049194607
ABSTRACT:
A supporting mechanism for a casing hanger improves the load withstanding ability. The casing hanger is located in a wellhead housing. A recess is formed in the bore of the wellhead housing with an upward facing shoulder extending into the bore. An insert ring is stationarily and rigidly mounted in this recess. The insert ring has a load shoulder on its upper side. The load shoulder of the insert ring is considerably less in width than the recess shoulder. However, the insert ring has a greater hardness to increase the capacity of the insert ring. The casing hanger has an exterior load ring that lands on the insert ring. The load ring has threads which are cut to have clearances initially between the load flanks. A clearance also exists between the upper end of the load ring and a downward facing shoulder on the casing hanger. A protuberance on the upper end of the load ring maintains this upper clearance until the load flank clearances close up, then allows the upper clearance to close up to assure loading through the flanks.
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Henderson, Jr. Herman O.
Milberger Lionel J.
Bradley James E.
Kisliuk Bruce M.
Vetco Gray Inc.
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