E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 43/08 (2006.01) E21B 34/10 (2006.01) E21B 43/12 (2006.01)
Patent
CA 2459567
An adjustable well screen assembly comprises a sandscreen (5) which is wrapped around a perforated base pipe (3) and a perforated sleeve (1) which is movably disposed concentrically inside the base pipe (3) between a first, closed, and open, position. In said first position of the sleeve (1) the perforations of the sleeve and base pipe (3) are unaligned and hydraulically isolated from each other and flow of fluids from the outer diameter of the screen (5) into the interior of the sleeve (1) is inhibited. In said second position the perforations of the sleeve and the base pipe are aligned and connected in fluid communication with each other and fluids are permitted to flow from the formation through the sandscreen and the perforations of the sleeve and base pipe into the interior of the sleeve.
L'invention porte sur un filtre de puits réglable comprenant un filtre (5) à sable enveloppant un tube de base (3) perforé, et un manchon perforé (1) disposé concentriquement dans le tube de base (3) et mobile entre une première position fermée, et une deuxième position ouverte. Dans la première position, les perforations du manchon (1) et du tube (3) de base ne sont pas alignées et ne communiquent pas entre elles, ce qui interdit le passage des fluides entre le diamètre extérieur du filtre (5) et l'intérieur du manchon (5). Dans deuxième position les perforations du manchon et du tube de base sont alignées et communiquent entre elles, ce qui permet aux fluides de la formation de s'écouler à travers le filtre à sable et les perforations du manchon et du tube de base vers l'intérieur du manchon.
Shell Canada Limited
Smart & Biggar
LandOfFree
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