Groundwater recovery system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/18 (2006.01) B09C 1/00 (2006.01) E21B 43/12 (2006.01) F04F 1/20 (2006.01) F04F 3/00 (2006.01)

Patent

CA 2157797

The specification discloses a system for recovering groundwater from a subterranean aquifer (12) through an extraction well (20) having a perforated casing (28) extending down to the water table (14) and a drop- tube (24) within the casing (22) to define an annular area (23) between the casing (22) and the drop-tube (24). A vacuum pump (26) is connected to the drop-tube (24) for inducing a flow of liquid up the tube (24). An aperture (48) is provided through the wall (40) of the drop-tube (24) to enable gas from the annular area (23) to enter the drop-tube (24) to mix with liquids flowing upwardly through the tube (24) and reduce the density of the flowing column (56) so that it is more easily lifted to the surface. The aperture (48) also provides a self-priming feature which avoids start-up problems associated with known vacuum dewatering methods.

Ce descriptif se rapporte à un système de récupération d'eaux souterraines dans une zone aquifère souterraine (12) par l'intermédiaire d'un puits d'extraction (20) comportant un tubage perforé (28) s'étendant vers le bas, en direction de la nappe d'eau (14) et un tuyau de drainage (24) se trouvant à l'intérieur du tubage (22) et formant une zone annulaire (23) avec le tubage (22). Une pompe à vide (26) est raccordée au tuyau de drainage (24) et sert à faire remonter le liquide dans le tuyau (24). Une ouverture (48) est ménagée dans la paroi (40) du tuyau de drainage (24) afin de permettre au gaz provenant de la zone annulaire (23) de pénétrer dans le tuyau de drainage (24) et de se mélanger aux liquides remontant dans le tuyau (24), et de réduire la densité de la colonne d'écoulement (56) de sorte qu'elle remonte plus facilement à la surface. L'ouverture (48) comporte également un élément à auto-amorçage qui permet d'éviter les problèmes de démarrage associés aux procédés connus d'assèchement par le vide.

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