A device for core drill

Details A device for core drill A device for core drill

E - Fixed Constructions

21

B

E21B 25/00 (2006.01) E21B 49/02 (2006.01)

Patent

CA 2163787

A core pipe (3) for coring or core drilling, especially with sampling inconnection with oil wells, wherein the core pipe (3) is rotatively suspended from a rotary drill pipe (1) operating a bit (2), and further provided with internal telescopically disposed core pipes (5, 6), rupture pins (7, 8) retain the core pipes (5, 6) in the initial positions thereof. When core material (10) strikes against a stop (9) at the upper end of the core pipe (6), or wedges itself or get stuck within the core pipe (6), the rupture pin (7) is cut off and the core pipe (6) follows the core material (10), the core pipe (6) then sliding within the core pipe (5). Should the core material (10) get wedged in the core pipe (5) beneath the core pipe (6), rupture pin (8) is cut off, the core pipe (5) then following the core material (10) upwardly within the outer core pipe (3).

Dispositif de carottage (3) pour recueil d'échantillons en vue du forage de puits de pétrole, suspendu rotativement à une tige de forage (1) actionnant un trépan (2) et muni de tubes télescopiques intérieurs de carottage (5, 6), et de goupilles de rupture (7, 8) maintenant lesdits tubes (5, 6) dans leur position initiale. Lorsque la carotte atteint une butée (10) située au sommet du tube de carottage (6), ou se coince d'elle-même ou reste bloquée dans ce tube (6), la goupille de rupture (7) se rompt, le tube de carottage (6) suit la carotte (10) et glisse à l'intérieur du tube de carottage (5). Au cas où la carotte (10) se coince dans le tube de carottage (5) au-dessous du tube de carottage (6), la goupille de rupture (8) se rompt et le tube de carottage (5) suit la carotte (10) vers le haut à l'intérieur du tube de carottage extérieur (3).

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