E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/20 (2006.01)
Patent
CA 2585476
The present invention provides a method and apparatus for setting concentric casing strings within a wellbore in one run-in of a casing working string. In one aspect of the invention, the apparatus comprises a drilling system comprising concentric casing strings, with each casing string having a drill bit piece disposed at the lower end thereof. The drill bit pieces of adjacent casing strings are releasably connected to one another. In another aspect of the invention, a method is provided for setting concentric casing strings within a wellbore with the drilling system. In another aspect of the invention, the releasably connected drill bit pieces comprise a drill bit assembly.
La présente invention concerne une méthode et un appareil pour disposer des colonnes de tubage concentriques dans un puits de forage en une seule passe. Selon un aspect de la présente invention, l'appareil comprend un système de forage comprenant des colonnes de tubage concentriques, chaque colonne de tubage étant munie d'un outil de forage à son extrémité. Les outils de forage des colonnes de tubage adjacentes sont reliés de manière à se détacher l'un de l'autre. Selon un aspect de l'invention, une méthode est présentée pour disposer les colonnes de tubage concentriques dans un trou de forage à l'aide d'un système de forage. Selon un autre aspect de l'invention, les outils de forage reliés de manière à se détacher comprennent un ensemble d'outils de forage.
Brunnert David J.
Galloway Gregory G.
Deeth Williams Wall Llp
Weatherford/lamb Inc.
LandOfFree
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