Expandable downhole tubing

Details Expandable downhole tubing Expandable downhole tubing

E - Fixed Constructions

21

B

E21B 43/10 (2006.01) E21B 17/00 (2006.01) E21B 29/10 (2006.01) F16L 55/162 (2006.01)

Patent

CA 2383150

The present invention relates to portions of casing that are inserted into a wellbore. The casing portions are provided with a protected portion in which a friction and/or sealing material can be located. In certain embodiments, the protected portion is provided by first and second annular shoulders that are spaced-apart axially along the length of the casing. The friction and/or sealing material is typically located on an outer surface of the casing between the annular shoulders. There is also provided a casing portion that has annular shoulders provided at either end of the casing portion, with means to connect successive casing portions located on these shoulders. The casing portion in this embodiment is provided with a friction and/or sealing material in a recessed portion of the casing portion.

L'invention concerne des parties de gainage introduites dans un forage. Lesdites parties sont pourvues d'une partie de protection dans laquelle on peut placer un matériau de frottement et/ou d'étanchéité. Dans certains modes de réalisation, la partie de protection est pourvue d'un premier et d'un second épaulements axialement espacés dans le sens de la longueur du gainage. Le matériau de frottement et/ou d'étanchéité est généralement placé sur une surface extérieure du gainage entre les épaulements annulaires. L'invention porte également sur une partie de gainage pourvue d'épaulements annulaires à ses deux extrémités, avec des moyens permettant de relier des parties de gainage successives placées sur ces épaulements. Dans ce mode de réalisation, la partie de gainage est dotée, dans une partie évidée, d'un matériau de frottement et/ou d'étanchéité.

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