Expandable seal

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 33/10 (2006.01) E21B 33/129 (2006.01)

Patent

CA 2583538

In one aspect, the present invention provides a sealing apparatus for use in tubular member. In one embodiment, the sealing apparatus includes an expandable sleeve and an expandable a toroidal / ring shaped seal. The seal seats within a circumferential saddle or groove formed' in the sleeve. An exemplary seal has an enlarged diameter' portion and presents a radially outward sealing surface. During expansion, the enlarged diameter portion is compressed against the tubular member but, at least initially, the remainder of the sealing surface is not compressed. Thus, the pressure associated with the compression is focused on the limited contact area between the seal and the tubular. Continued expansion can increase the contact pressure and/or the amount of contact area. In one arrangement, the seal is configured to provide a gas tight seal.

Dans un aspect, la présente invention concerne un appareil de jointoiement utilisé dans un élément tubulaire. Dans un mode de réalisation, l'appareil de jointoiement comprend une gaine extensible et un joint extensible de forme torique / annulaire. Le joint est posé à l'intérieur d'une sellette ou d'une encoche circulaire, formée dans la gaine. Un joint d'exemple comprend une partie à diamètre élargi et présente une surface de jointoiement tournée vers l'extérieur. Pendant la dilatation, la partie à diamètre élargie est comprimée contre l'élément tubulaire; cependant, au moins au stade initial, le reste de la surface de jointoiement n'est pas comprimé. De cette manière, la pression associée à la compression est concentrée dans la zone de contact limitée entre le joint et l'élément tubulaire. La dilatation prolongée peut augmenter la pression de contact et/ou la surface de la zone de contact. Dans un mode de réalisation, le joint est configuré de manière à être étanche aux gaz.

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