E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 31/20 (2006.01) E21B 33/128 (2006.01) F16L 1/16 (2006.01) F16L 55/132 (2006.01)
Patent
CA 2419231
To obviate the need for hydraulic lines from the surface, external water pressure is used to compress a seal member (20) and form a seal with a surrounding pipe (30). Valve (24) is opened at depth to allow water to act on a piston (16), moving it within a chamber (14) so as to compress the seal member (20). A second valve (29) may be opened so that water acts on the opposite end of the piston (16) to release the seal member (20).
Pour éviter de recourir à l'emploi de conduits hydrauliques à partir de la surface, la pression extérieure de l'eau est exploitée pour comprimer un élément d'étanchéité (20) et former un joint d'étanchéité avec un tuyau périphérique (30). Une soupape (24) est ouverte en profondeur pour permettre, à l'intérieur d'une chambre (14), un mouvement de l'eau agissant comme un piston (16) pour comprimer l'élément d'étanchéité (20). Une seconde soupape (29) peut être ouverte pour permettre à l'eau d'agir sur l'extrémité opposée du piston (16) afin de libérer l'élément d'étanchéité (20).
Borden Ladner Gervais Llp
Bsw Limited
LandOfFree
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