Apparatus for facilitating removal of a casing of an overburden

Details Apparatus for facilitating removal of a casing of an overburden Apparatus for facilitating removal of a casing of an overburden

1997-12-29

1999-07-13

Bagnell, David J.

Boring or penetrating the earth

Bit or bit element

Impact or percussion type

175171, E21B 1036

Patent

active

059213329

ABSTRACT:
An overburden drilling device includes a drill bit body, a percussion element for applying impacts to the body, and a casing attached to the body. The casing is connected to the drill bit body by a casing shoe. The casing shoe and the drill bit body are interconnected by radially overlapping walls so that the drill bit body pulls the casing along during a drilling operation while rotating relative thereto. A wedge-shaped member is provided around the casing close to a rear end of the casing shoe so as to facilitate removal of the drilling equipment from a bore.

REFERENCES:
patent: 3269470 (1966-08-01), Kelly
patent: 3982596 (1976-09-01), Vetter
patent: 5255960 (1993-10-01), Ilomaki
patent: 5590726 (1997-01-01), Jarvela et al.

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