Casing drilling shoe

Details Casing drilling shoe Casing drilling shoe

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 10/62 (2006.01) E21B 17/14 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2334741

A casing drilling shoe (1) is disclosed which is adapted for attachment to a casing string and comprises an outer drilling section (2) constructed of a relatively hard material such as steel and an inner section (4) constructed of a readily drillable material such as aluminium. The drilling shoe further includes a means (7) for controllably displacing the outer drilling section to enable the shoe to be drilled through using a standard drill bit and subsequently penetrated by a reduced diameter casing string or liner.

L'invention concerne un sabot (1) de forage conçu pour être fixé à une colonne de tubage. Ce sabot comprend une partie (2) de forage extérieure constituée d'une matière relativement dure, telle que de l'acier et une partie (4) intérieure constituée d'une matière facilement forable, telle que de l'aluminium. Le sabot de forage comprend également un dispositif (7) permettant de déplacer de manière régulable la partie de forage extérieure, de façon qu'il soit possible de forer à travers le sabot au moyen d'un trépan standard et ultérieurement de pénétrer dans ledit sabot au moyen d'une colonne de tubage ou d'une colonne perdue.

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