Downhole tool

Details Downhole tool Downhole tool

E - Fixed Constructions

21

B

E21B 33/10 (2006.01) E21B 34/14 (2006.01)

Patent

CA 2567632

A downhole tool (10) for use in isolating a formation in a well bore from fluid pressure introduced from the surface. Mounted in a work string, the tool provides an axial throughbore (18) and radial outlets (40, 42) above and below a permanent sealing element (26), such as a diverter cup. Valve members (44, 50) which may be nested sleeves located within the axial bore are manipulated by activation through the work string, to move sequentially such that (a) a first circulation path is created around the seal, via the radial outlets and independent of the axial throughbore; (b) the axial throughbore is obstructed and a second circulation path is estate fished between the axial throughbore and .the upper radial outlet; and (c) flow is re-established through the axial bore while maintaining the second flow path.

L'invention concerne un outil (10) fond de trou qui sert à isoler une formation dans un trou de forage de la pression d'un fluide introduit à partir de la surface. Monté dans un train de forage, cet outil présente un passage axial traversant et des sorties radiales placées au-dessus et au-dessous d'une élément d'étanchéité permanent tel qu'une coupelle de déviation. Des systèmes de soupape qui peuvent comprendre des manchons incorporés placés dans le passage axial, sont manipulés par l'intermédiaire de un train de forage qui les active de manière séquentielle, de telle manière que (a) une première voie de circulation est créée autour de l'élément d'étanchéité par l'intermédiaire des sorties radiales, et indépendamment du passage traversant axial, (b) le passage axial est obstrué, et une seconde voie de circulation est établie entre le passage traversant axial et la sortie radiale supérieure, et (c) l'écoulement à travers le passage axial est rétabli, la seconde voie étant simultanément maintenue ouverte.

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