Boring or penetrating the earth – Boring a submerged formation
Patent
1980-02-11
1982-06-15
Pate, III, William F.
Boring or penetrating the earth
Boring a submerged formation
37 63, 175 65, 175171, 405226, 405248, E21B 712
Patent
active
043345840
ABSTRACT:
A sea-floor cellar is installed in substantially in the sea-floor in a shallow water area where the distance between the sea-floor, which has a packed or rock ladened soil formation, and a drill ship is not sufficient to allow for normal positioning of a blowout preventer stack on the surface of the sea-floor. According to the method and apparatus of this invention, a first honeycomb of bore holes is drilled in the designated bottom area; a second honeycomb of bore holes having diameters larger than the first honeycomb of holes is then drilled into the designated bottom area to produce a second honeycomb of bore holes of larger diameter; and, a bar member is then rotated into the bore hole to eliminate soil structures left standing in the second honeycomb to produce a substantially clear recessed area for receiving the implantable sea-floor cellar to house a blowout preventer stack substantially below the surface of the subsea bottom.
REFERENCES:
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patent: 908113 (1908-12-01), Lovett
patent: 1356646 (1920-10-01), Maher
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OTC 3250 "Shallow Water Drilling with Deep Water Drillship", Magill and Macan, OTC 1978, May 8-11.
"Deepwater Drillship Works in Shallowest Depth Ever", Reprint from Sep. 5, 1977, Oil and Gas Journal.
Atwood Oceanics, Inc.
Pate III William F.
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