Arrangement and method for conducting substance and seal...

E - Fixed Constructions – 21 – B

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E21B 33/14 (2006.01) E21B 33/16 (2006.01)

Patent

CA 2030191

A well bore operating string (OS) has upper (45) and lower (26) wipers thereon with the wipers releasably connected by a frangible member (81) for releasing the wipers (45), (26) in response to pressure in the operating string (OS). Seals (210), (211), (212), (214), (215), (216), (217) are provided to close off communication from the operating string bore to confine the pressure present in the operating string in a manner to assure release of the wipers as and when desired and in a sequence as may be desired. Upper (50) and lower (35) pump down plugs sealably seat, respectively, in the upper (45) and lower (26) wipers to form a movable, mechanical barrier to isolate or wipe ahead of and behind a substance for movement through the operating string (OS) and subsequent discharge into the well bore (WB). The wipers (45), (26) are each connected to the operating string (OS) to prevent relative rotation therebetween to further reduce the possibility of malfunction or improper functioning in releasing the wipers (45), (26).

Train de tiges de forage de production pour puits de sondage (OS) comportant des essuie-tiges (45) et (26) supérieur et inférieur reliés de façon à pouvoir être libérés à l'aide d'un élément frangible (8) en réaction à la pression dans le train de tiges (OS). Des garnitures (210), (211), (212), (214), (215), 216) et (217) servent à couper la communication à partir du trou du train de tiges de production pour confiner la pression présente dans le train de tiges de production de manière à assurer le dégagement des essuie-tiges de la façon et au moment voulus et, dans la séquence, désirée. Les bouchons de queue du haut (50) et du bas (35) se placent de manière à former un joint, respectivement dans les essuie-tiges du haut (45) et du bas (26) pour constituer une barrière mécanique mobile qui isole ou qui chasse vers l'avant ou vers l'arrière une substance pour la déplacer dans le train de tiges de production (OS) et se déverser par la suite dans le trou de forage (WB). Les essuie-tiges (45) et (26) sont reliés au train de tiges de production (OS) pour empêcher la rotation relative entre eux de manière à réduire davantage la possibilité d'une défectuosité ou d'un mauvais fonctionnement lors du dégagement des essuie-tiges (45) et (26).

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