Method of caisson placement

Details Method of caisson placement Method of caisson placement

E - Fixed Constructions

21

B

255/8

E21B 7/20 (2006.01) E02D 15/08 (2006.01) E21B 7/12 (2006.01) E21B 21/00 (2006.01) E21B 33/037 (2006.01)

Patent

CA 1110612

ABSTRACT A caisson and connecting conductor pipe sections are lowered to a predetermined position on the ocean underwater floor. A drill stem having a combined drilling and reaming tool is posi- tioned within the conductor pipe and caisson. Drilling mud is reversed-circulated through the annular space between the conduc- tor pipe and caisson and the drill stem, the drilling mud return- ing through the drill stem. The tool mounted on the drill stem is utilized to drill to a predetermined depth whereupon one or more reaming arms open outward from the tool and are rotated, thereby cutting out a volume of the ocean floor within which the caisson may be positioned.

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