Insertion of liners into host tubulars by fluid injection

Details Insertion of liners into host tubulars by fluid injection Insertion of liners into host tubulars by fluid injection

B - Operations, Transporting

29

C

B29C 63/34 (2006.01) B23P 19/04 (2006.01) B29C 63/42 (2006.01) F16L 55/165 (2006.01) F16L 58/02 (2006.01)

Patent

CA 2338676

A method of inserting a liner (10) into a host tubular (60), in which the liner is deformed to reduce its cross-sectional dimensions; the deformed liner is fed into the host tubular in a downstream direction; and a fluid is injected under pressure into the host tubular to urge the liner in the downstream direction, while the fluid pressure maintains the deformation of the liner. The liner is advantageously deformed by at least one set of rollers (22, 23, 24) into an unstable cross- sectional shape which has at least three axes of symmetry and which spontaneously expands into contact with the host tubular unless held by the pressure of the injected fluid. The injected fluid applies a shear force to the liner in the downstream direction which is substantially uniform along the length of the liner.

La présente invention concerne un procédé permettant d'insérer une garniture intérieure (10) dans un tuyau hôte (60), selon lequel on déforme la garniture intérieure afin de réduire ses dimensions transversales. On introduit le garniture déformée dans le tuyau hôte vers l'aval, et l'on injecte un fluide sous pression dans le tuyau hôte afin de pousser la garniture vers l'aval, la pression du fluide permettant de maintenir la déformation de la garniture. La garniture intérieure est avantageusement déformée par au moins un ensemble de galets (22, 23, 24) en une forme transversale instable présentant au moins trois axes de symétrie, qui se dilate spontanément jusqu'à entrer en contact avec le tuyau hôte lorsqu'elle n'est pas maintenue par la pression du fluide injecté. Le fluide injecté applique sur la garniture intérieure, vers l'aval, une force de cisaillement sensiblement uniforme sur la longueur de la garniture.

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