Drill string retrieving apparatus

E - Fixed Constructions – 21 – B

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Details

E21B 21/10 (2006.01) E21B 19/06 (2006.01) E21B 23/04 (2006.01)

Patent

CA 2342112

A tool (10) is provided for use in retrieving a drill string from a bore. The tool includes a body (12) which, in use, is suspended from a travelling block. A fluid inlet (16) communicates via a passage (18) with an outlet (20) in communication with a drill string (11). A coupling (22) is provided for selectively engaging the drill string (11). A one-way valve (26) is located in the passage (18) in order to regulate fluid flow through the passage (18). When fluid flow is interrupted, the normally closed valve (26) maintains fluid pressure on the coupling (22), so retaining the coupling (22) on the drill string (11).

On décrit un outil (10) qu'on utilise pour récupérer un train de forage dans un trou de forage. L'outil comprend un corps (12) qui, en utilisation, pend d'un moufle mobile. Une entrée (16) pour le fluide communique par un passage (18) avec une sortie (20) qui communique avec un train de forage (11). Un dispositif (22) de couplage est prévu pour bloquer sélectivement le train de forage (11). Une soupape (26) à simple action est placée dans le passage (18) pour réguler l'écoulement de fluide dans le passage (18). Lorsque l'écoulement de fluide est interrompu, la soupape qui est normalement fermée maintient la pression du fluide sur le dispositif (22) de couplage, ceci retenant le dispositif (22) de couplage sur le train de forage (11).

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