Boring or penetrating the earth – With below-ground tool drive prime mover – With positive connection between tool and support shaft for...
Patent
1996-10-09
1998-12-08
Bagnell, David J.
Boring or penetrating the earth
With below-ground tool drive prime mover
With positive connection between tool and support shaft for...
175171, 175257, E21B 720
Patent
active
058457224
ABSTRACT:
A method of sinking a bore hole in underground formations which have at least one special stratiform formation which features vastly differing formation pressures in respect to a formation adjacent to it in the sinking direction and in which a drilling tool carried at the bottom end of a drill line and having a drill bit driven by a deep drilling motor drills out a first part of a bore hole which extends to a point close to the boundary area of the special formation, characterized in that upon subsequent sinking of a further part of the bore hole by the casing string which passes through at least one special formation, a tubular outer casing with a bottom end carrying a driven drill head is entrained, the bore hole being lined by this, at least in the region of the special formation.
REFERENCES:
patent: 3732143 (1973-05-01), Joosse
patent: 3901331 (1975-08-01), Djurovic
patent: 4842081 (1989-06-01), Parant
patent: 5186265 (1993-02-01), Henson et al.
patent: 5197553 (1993-03-01), Leturno
patent: 5472057 (1995-12-01), Winfree
Makohl Friedheim
Pudjihanto Surwano
Vogt Carsten
Bagnell David J.
Baker Hughes Incorporated
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