Bi-directional and internal pressure trapping packing...

Details Bi-directional and internal pressure trapping packing... Bi-directional and internal pressure trapping packing...

E - Fixed Constructions

21

B

E21B 33/128 (2006.01)

Patent

CA 2449518

A packer (100) for sealing an annular region in a wellbore is provided. The packer (100) includes a packing element (150) which is held through bi-directional forces. The packer first comprises an inner mandrel (110). Disposed around the inner mandrel are three tubulars: a top sleeve (120), a bottom sleeve (130), and a booster sleeve (140). A packing element (150) is disposed circumferentially around the outer surface of the booster sleeve (140). The top sleeve (120) and bottom sleeve (130) each include an upper compression member (124,134) which rides across the booster sleeve (140) in order to compress the packing element (150). The packing ele- ment is expanded outward from the packer to engage a surrounding string of casing (10) through compressive forces provided by the top and bottom sleeves (120,130). Thereafter, differential pressure applied above or below the packer acting on the packer element (150) and booster sleeve (140) may provide additional compression of the packer element (150). Image

L'invention concerne une garniture d'étanchéité (100) destinée à l'étanchéisation d'une zone annulaire dans un puits de forage. La garniture d'étanchéité (100) comprend un élément d'étanchéité (150) maintenu en place par des forces bidirectionnelles. La garniture d'étanchéité (100) comprend un mandrin interne (110). Le mandrin interne (110) est entouré par trois éléments tubulaires : un manchon supérieur (120), un manchon inférieur (130) et un manchon de suppression (140). L'élément d'étanchéité (150) est disposé autour de la surface externe du manchon de suppression (140). Le manchon supérieur (120) et le manchon inférieur (130) comprennent chacun un élément de compression supérieur (124, 134) qui traverse le manchon de suppression (140), destinés à comprimer l'élément d'étanchéité (150). L'élément d'étanchéité (150) est déployé vers l'extérieur depuis la garniture d'étanchéité (100) afin d'entrer en prise avec une rame de tubage (10) sous l'effet des forces de compression induites par le manchon supérieur (120) et le manchon inférieur (130). La pression différentielle appliquée au-dessus ou en dessous de la garniture d'étanchéité (100) agit sur l'élément d'étanchéité (150), ce qui permet au manchon de suppression (140) de comprimer davantage l'élément d'étanchéité (150).

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