Wellhead casing hanger assembly

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 19/00 (2006.01)

Patent

CA 2185836

Opposed pairs of sockets are formed by the bottom surface of the slip housing and the top surface of the bottom ring of a casing hanger assembly. Vertical holes are provided in the elastomer seal element which is sandwiched between the slip housing and bottom ring. Each pair of sockets and corresponding seal element hole form a socket chamber. Rigid, motion-limiting pins are positioned in the socket chambers. Each pin has side and bottom clearances with the chamber side and bottom walls. The pins are therefore initially free floating, to allow the seal element to move to accommodate oversized casing; but the pins take up the casing load as the slip housing descends and limit its downward travel, thereby preventing excessive compression of the seal element, which can lead to casing damage.

Paires opposées d'emboîtements formés par la surface inférieure de l'enveloppe coulissante et la surface supérieure de l'anneau se trouvant au fond d'un raccord de suspension de tubage. Le joint élastomère comporte des perforations verticales et est placé en sandwich entre l'enveloppe coulissante et le raccord de suspension de tubage. Chaque paire d'emboîtements et le trou correspondant de l'obturateur forment une chambre d'emboîtement. Des tiges rigides de limitation de mouvement sont placées dans les chambres d'emboîtement, chaque tige ayant un écartement latéral et un vide à fond de dent par rapport au côté de la chambre et aux parois de fond. Les tiges peuvent donc initialement bouger librement pour permettre à l'obturateur de bouger pour loger un tubage surdimensionné, mais elles supportent le poids du tubage à mesure que l'enveloppe coulissante descend, et elles limitent le déplacement de celle-ci vers le bas, empêchant une compression excessive de l'obturateur, ce qui pourrait endommager le tubage.

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