Well screen with drainage assembly

Details Well screen with drainage assembly Well screen with drainage assembly

E - Fixed Constructions

21

B

E21B 43/08 (2006.01) E21B 43/10 (2006.01)

Patent

CA 2757166

A well screen assembly 240, 240' has an elongate base pipe 230 having apertures therein. A filtration layer resides around the base pipe. A drainage assembly 200, 200' resides between the base pipe and the filtration layer. The drainage assembly includes a plurality of elongate risers 205 carried on a mesh 225. The drainage layer supports the filtration layer apart from the elongate base pipe and defines an elongate passage 215 between the base pipe and the filtration layer that communicates fluid laterally through the drainage assembly.

La présente invention concerne une structure de filtre de puits 240, 240' ayant un tuyau de base élongé 230 comprenant des ouvertures. Une couche de filtrage repose autour du tuyau de base. Une structure de drainage 200, 200' repose entre le tuyau de base et la couche de filtrage. La structure de drainage comprend une pluralité de tubes verticaux 205 portés sur un treillis 225. La couche de drainage supporte la couche de filtrage séparément du tuyau de base élongé et définit un passage élongé 215 entre le tuyau de base et la couche de filtrage qui permet une communication de fluide latérale à travers la structure de drainage.

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