Core sampling method and core sampler therefor

Details Core sampling method and core sampler therefor Core sampling method and core sampler therefor

E - Fixed Constructions

21

B

E21B 49/00 (2006.01) E21B 25/00 (2006.01) E21B 25/08 (2006.01)

Patent

CA 2242922

A core sampling method, particularly for the oil industry, wherein actual core sampling is performed by means of a core sampler (1) comprising at least one inner barrel (5), an outer barrel (2) and a bit (3), and a substantially axial compressive force (F) is exerted on the top (7A) of a core sample (7) being formed, at least during a major part of the core sampling process, said force being within a range determined particularly on the basis of the material of the core sample (7), whereafter the force (F) is removed at the latest before the core sample (7) is withdrawn from the inner barrel (5). A core sampler for carrying out the method is also provided.

Procédé de carottage, en particulier dans le domaine pétrolier, comprenant un carottage proprement dit au moyen d'un carottier (1) comportant au moins un tube intérieur (5), un tube extérieur (2) et une couronne (3), et comprenant en outre, pendant au moins une majeure partie du carottage, une application, sur le sommet (7A) d'une carotte (7) en cours de formation, d'une force de compression (F) sensiblement axiale, comprise entre des limites choisies en fonction notamment de la matière de la carotte (7), et une suppression de cette force (F), au plus tard avant de sortir la carotte (7) du tube intérieur (5); et carottier pour la mise en oeuvre du procédé.

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