Core sampler

Details Core sampler Core sampler

E - Fixed Constructions

21

B

E21B 25/00 (2006.01) E21B 25/02 (2006.01) E21B 25/06 (2006.01)

Patent

CA 2242970

A core sampler, particularly for oil prospecting, including a coring bit (2), an outer barrel (3) for rotating the coring bit (2), and an inner barrel (5) for receiving the core sample (7) in its internal space (8) during coring, the inner (5) and outer (3) barrels being substantially coaxial, and further' comprising an intermediate barrel (15) coaxially arranged between the inner (5) and outer (3) barrels and defining a first longitudinal coring fluid channel (16) with the outer barrel (3), and a second longitudinal coring fluid channel (17) with the inner barrel (5), as well as said longitudinal channels (16, 17) and means for at least temporarily selectively causing and/or cutting off coring fluid communication between the rear end (17B) of the second longitudinal channel (17) and/or the rear end (16B) of the first longitudinal channel (16) and/or the rear end (8B) of the internal space (8).

Carottier, en particulier dans le domaine de la prospection pétrolière, comprenant une couronne de carottage (2), un tube extérieur (3) pour l'entraînement en rotation de la couronne de carottage (2), et un tube intérieur (5) pour recevoir une carotte (7) dans son espace interne (8) au cours du carottage, les tubes intérieur (5) et extérieur (3) étant sensiblement coaxiaux, comportant de plus un tube médian (15) agencé coaxialement entre les tubes intérieur (5) et extérieur (3) et délimitant, d'une part avec le tube extérieur (3), un premier canal longitudinal (16) pour un fluide de carottage et, d'autre part avec le tube intérieur (5), un second canal longitudinal (17) pour un fluide de carottage, les canaux longitudinaux (16, 17) et des moyens qui réalisent et/ou bloquent sélectivement, au moins temporairement, une communication de fluide de carottage entre l'extrémité postérieure (17B) du second canal longitudinal (17) et/ou celle (16B) du premier canal longitudinal (16) et/ou celle (8B) de l'espace interne (8).

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