Tool and method for removing excess cement from the top of a...

E - Fixed Constructions – 21 – B

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E21B 37/00 (2006.01) E21B 23/00 (2006.01) E21B 33/16 (2006.01) E21B 34/12 (2006.01) E21B 34/14 (2006.01) E21B 37/02 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2280034

A tool (100) for removing excess cement from the top of a liner (51) after hanging and cementing thereof by inner string comprises a hollow mandrel (4), a valve sleeve (7) and a port (12) in said hollow mandrel (4) wherein said valve sleeve (7) is movable to open and close said port (122) to allow circulating fluid to be introduced into the liner (51) or casing in the vicinity of the liner hanger (54) supporting the liner. The circulating fluid washes the excess cement away and a non rotating casing scraper can obviate the need for a separate trip to clean the inside of the casing. An apparatus is also disclosed for indicating that a predetermined quantity of fluid has been ejected from a pipe in a wellbore comprising a pressure gauge, a dart (280), a shearable member (293) initially shearably attached to said dart (280) and a landing seat wherein, in use, said dart (280) follows said predetermined quantity of fluid through said pipe, said shearable member (293) lands on said landing seat (294), a pressure increase is noted on said pressure gauge, said dart (280) shearing away from said shearable member (293), indicating that a fixed quantity of fluid is now left in said pipe to be ejected. A liner is also disclosed which comprises at least one of a float collar and a float shoe mounted therein, characterised in that said liner is further provided with a closure member (291) which, in use, on withdrawal of a stinger (259), closes.

Outil (100) pour l'élimination d'excès de ciment de la partie supérieure d'une colonne perdue (51) après suspension et cimentage de celle-ci par le biais d'une colonne de tubage interne comprenant un mandrin creux (4), un manchon (7) de soupape et un orifice (12) dans ledit mandrin creux (4). Ledit manchon (7) de soupape est mobile et permet ainsi d'ouvrir et fermer ledit orifice (122) afin de permettre au fluide de forage d'être introduit dans la colonne perdue (51) ou le tubage à proximité de la suspension (54) de colonne perdue accueillant la colonne perdue. Le fluide de forage emporte l'excès de ciment et un racleur de tubage non rotatif permet d'éviter un trajet séparé lors du nettoyage de l'intérieur du tubage. Un appareil fait aussi l'objet de cette invention et permet d'indiquer qu'une quantité prédéterminée de fluide a été expulsée d'un conduit dans un forage comprenant un manomètre, un clapet (280), un élément cisaillable (293) fixé au départ de manière cisaillable audit clapet (280) et un siège de réception. Lors de l'utilisation, ledit clapet (280) suit ladite quantité prédéterminée de fluide à travers ledit conduit, ledit élément cisaillable (293) vient reposer sur ledit siège (294) de réception, une augmentation de la pression est relevée sur ledit manomètre, ledit clapet (28) est cisaillé et détaché dudit élément cisaillable (293), indiquant qu'une quantité fixe de fluide se trouve dans ledit conduit en vue d'une évacuation. Une colonne perdue fait aussi l'objet de cette invention. Elle comprend au moins un anneau de retenue pour bouchons et un sabot à soupape montés sur celle-ci et est pourvue d'un élément (291) de fermeture qui, lors de son utilisation, se ferme sous l'effet du retrait d'une élinde flottante (259).

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