Drilling with concentric strings of casing

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing

Reexamination Certificate

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Details

C175S022000, C166S380000

Reexamination Certificate

active

06857487

ABSTRACT:
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.

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