Boring or penetrating the earth – Boring a submerged formation – Boring from nonbuoyant support
Patent
1980-04-25
1982-04-27
Leppink, James A.
Boring or penetrating the earth
Boring a submerged formation
Boring from nonbuoyant support
405195, E21B 712, E21B 704
Patent
active
043265952
ABSTRACT:
Method for drilling well bores into an offshore substrate from a marine platform which is fixed to the ocean floor. The latter is provided with a cage which is removably positioned in a platform leg. A drill conductor carried in the cage guides a lowering drill string into a desired direction away from the platform. The cage is periodically raised and rotated, or provided with a different conductor orientation to permit a variation in the drilling direction.
REFERENCES:
patent: 1900163 (1933-03-01), Dana et al.
patent: 2503516 (1950-04-01), Shrewsbury
patent: 4030310 (1977-06-01), Schirtzinger
patent: 4068729 (1978-01-01), Peevey
patent: 4136996 (1979-01-01), Burns
Burns Robert B.
Kulason Robert A.
Leppink James A.
Ries Carl G.
Texaco Development Corporation
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