Power slip assembly for wellhead casing and wellbore tubing

Details Power slip assembly for wellhead casing and wellbore tubing Power slip assembly for wellhead casing and wellbore tubing

E - Fixed Constructions

21

B

E21B 33/04 (2006.01)

Patent

CA 2680428

A power slip extends a joint from tubing disposed in casing at a well so that a casing head can install on the casing and the tubing can be packed-off from the casing. The joint attaches to an inner sleeve having collet members that fit onto the inner tubing so that the joint extends thereabove. An outer sleeve and interlocking collet assemble together and install onto the inner sleeve. The collet threads onto the inner sleeve and forces the outer sleeve downward onto the inner sleeve. Being forced, the outer sleeve causes the collet members to engage around the inner tubing. The casing head then installs on the casing with the joint extending up through the head's bowl. An H-plate installs in the open bowl around the extended joint, and another pack--off installs on the joint to pack it off from a spool attaching to the casing head.

Un ensemble de coins de retenue forme un joint à partir du tubage disposé dans le gainage d'un puits, de façon à ce que la tête de sonde puisse être étanchéifiée par rapport au gainage. Le joint se lie à un manchon interne pourvu d'éléments de serrage qui s'adaptent au tube de protection interne de telle sorte que le joint recouvre ceux-ci. Un manchon externe et une pince en chicane s'assemblent et se posent sur le manchon interne. L'élément de serrage se visse dans le manchon interne et pousse le manchon externe vers le bas contre le manchon interne. Par suite de cette pression, le manchon externe fait en sorte que les éléments de serrage s'engagent autour du tube de protection interne. La tête de sonde s'installe alors sur le gainage et le joint recouvre la cloche de guidage de la tête. Une plaque en forme de "H" s'installe dans la cloche ouverte autour du joint étendu et un autre packer s'installe sur le joint pour l'étanchéifier par rapport au tambour qui s'adapte à la tête de sonde.

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