Methods for seabed piston coring

E - Fixed Constructions – 21 – B

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E21B 25/18 (2006.01) E21B 25/00 (2006.01)

Patent

CA 2299264

A method of acquiring a core sample of seabed material into a core sampling tube having an upper end, a lower open end and a substantially cylindrical chamber extending therebetween, comprising the steps of urging the core sampling tube into the seabed and simultaneously withdrawing fluid from the upper end of the core sampling tube at a rate sufficient to cause the seabed material to be drawn into the core tube at substantially the same rate as the core tube penetrates the seabed.

Cette invention a trait à une technique permettant de recueillir une carotte de sondage de matériau des fonds marins dans un tube à carottage possédant une extrémité supérieure, une extrémité inférieure libre et une chambre sensiblement cylindrique située entre ces extrémités. La technique consiste à enfoncer le tube à carottage dans le fond marin et en même temps à aspirer un fluide par l'extrémité supérieure du tube et ce, à une vitesse suffisante pour attirer le matériau constituant le fond marin dans le tube à carottage à un rythme quasiment identique à celui de la pénétration du tube dans le fond marin.

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