Apparatus for passive removal of subsurface contaminants

Details Apparatus for passive removal of subsurface contaminants Apparatus for passive removal of subsurface contaminants

B - Operations, Transporting

09

B

B09B 1/00 (2006.01) B09C 1/00 (2006.01) B09C 1/10 (2006.01) E21B 34/02 (2006.01) E21B 34/16 (2006.01) E21B 43/12 (2006.01) E21B 43/34 (2006.01)

Patent

CA 2221770

An apparatus (10) is provided which passively removes contaminated gases form a subsurface (16). The apparatus (10) includes a riser pipe (12) extending into a subsurface (16) which has an exterior end in fluid communication with a valve (32). When well pressure is greater than atmospheric pressure, the valve (32) opens to release contaminants into the atmosphere, and when well pressure is less than atmospheric pressure, the valve (32) closes to prevent flow of air into the well (18). The valve assembly of the invention comprises a lightweight ball (42) which is lifted from its valve seat (40) with a slight pressure drop between the well (18) and the atmosphere.

L'invention concerne un appareil (10) qui élimine passivement les gaz contaminés d'une sous-surface (16). Ledit appareil (10) comporte une colonne montante (12) s'étendant dans une sous-surface (16), et dont une extrémité extérieure est en communication fluidique avec une soupape (32). Lorsque la pression dans le puits est supérieure à la pression atmosphérique, la soupape (32) s'ouvre pour libérer les contaminants dans l'atmosphère, et lorsque la pression dans le puits est inférieure à la pression atmosphérique la soupape (32) se ferme pour empêcher l'afflux d'air dans le puits (18). L'ensemble soupape selon l'invention comporte une bille légère (42) qui est soulevée de son logement (42) de soupape par une légère chute de pression entre le puits (18) et l'atmosphère.

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