Gas displaced chamber lift system having gas lift assist

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/16 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2426305

An artificial lift system for use in a well bore including at least one chamber (14) having an inlet and an outlet, a power gas string (16) in valved communication with the chamber (14), a liquid string (18) in valved communication with the outlet of the chamber (14), a vent (20) in valved communication with the chamber (14) and in valved communication with the liquid string (18) at a location above the chamber (14), a compressor (22) connected to the power gas string (16) and adapted to pass a pressurized gas into the power gas string (16), and a valve (24) connected to the power gas string (16) and to the chamber (14) the adapted to selectively allow the pressurized gas to enter the chamber (14) so as to cause a liquid in the chamber (14) to pass through the outlet of the chamber (14) and into the liquid string (18). The vent (20) has a check valve (29) connected to the liquid string (18) and adapted to pass a portion of the vented gas into the liquid string (18). The liquid extends continuously as an ungasified liquid along the liquid string from the outlet to the check valve (29) between the vent (20) and the liquid string (18).

L'invention concerne un système de relevage artificiel utilisable dans un puits de forage, comprenant au moins une chambre (14) pourvue d'un orifice d'admission et d'un orifice d'évacuation, une colonne de gaz combustible (16) communiquant par l'intermédiaire d'une vanne avec la chambre (14), une colonne de liquide (18) communiquant par l'intermédiaire d'une vanne avec l'orifice d'évacuation de la chambre (14), un évent (20) communiquant par l'intermédiaire d'une vanne, d'une part, avec la chambre (14) et, d'autre part, avec la colonne de liquide (18) à un endroit situé au-dessus de la chambre (14), un compresseur (22) relié à la colonne de gaz combustible (16) et conçu pour acheminer un gaz sous pression dans la colonne de gaz combustible (16), et une vanne (24) reliée à la colonne de gaz combustible (16) et à la chambre (14) de manière à permettre à un liquide contenu dans la chambre (14) de passer à travers l'orifice d'évacuation de la chambre (14) pour aller dans la colonne de liquide (18). L'évent (20) comprend un clapet de retenue (29) relié à la colonne de liquide (18) et conçu pour faire passer une portion du gaz évacué dans la colonne de liquide (18). Le liquide s'étend de manière continue, tel un liquide non gazéifié le long de la colonne de liquide depuis l'orifice d'évacuation vers le clapet de retenue (29) entre l'évent (20) et la colonne de liquide (18).

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