Improved full bore nipple and associated lock mandrel therefor

Details Improved full bore nipple and associated lock mandrel therefor Improved full bore nipple and associated lock mandrel therefor

E - Fixed Constructions

21

B

E21B 23/02 (2006.01) E21B 33/12 (2006.01)

Patent

CA 2228885

An improved full bore nipple and associated lock mandrel provides enhanced sealing capability in tubing strings positioned in subterranean wells. In a described embodiment of the full bore nipple, a nipple body has a recessed seal surface and a latch profile formed on an internal bore of the body. In a described embodiment of the lock mandrel, an expander sleeve radially outwardly expands a circumferential seal to sealingly engage the recessed seal surface, locks a series of keys into the latch profile, and displaces another seal to sealingly engage an outer housing, when the expander sleeve is displaced axially downward relative to an inner mandrel of the lock mandrel.

Cette invention concerne un manchon d'accouplement à passage intégral amélioré et le mandrin de verrouillage y associé qui rehaussent l'étanchéité des colonnes de tubes dans les puits. Dans la variante décrite, le manchon comporte une rainure et un profil de verrouillage pratiqués dans sa paroi intérieure. Dans la variante décrite du mandrin de verrouillage, un manchon à extension radiale vers l'extérieur pousse un joint annulaire dans la rainure susmentionnée pour constituer un joint étanche, cale une série de clavettes dans le profil de verrouillage et déplace un autre joint d'étanchéité contre un tubage extérieur lorsqu'il est abaissé par rapport à un mandrin intérieur du mandrin de verrouillage.

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