Crude oil recovery system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/00 (2006.01) E21B 43/12 (2006.01)

Patent

CA 2445698

A crude oil recovery system (10) includes a downhole pump (22) and an extension (60) that extends below the downhole pump (22). The extension (60) has an extension inlet (62) positioned below the lowest drawdown level (L2) achievable by the pump (22). All of the fluid pumped by the downhole pump (22) enters the extension (60) via the extension inlet (62), and by positioning the extension inlet (62) sufficiently below the lowest drawndown level (L2) achievable by the pump (22), pressurized gas (82) is prevented from entering the extension (60), the pump (22), or the pump column (40) above the pump (22). In this way, gas (82) is prevented from displacing oil (80) in the pump column (40), thereby maintaining excellent cooling for the polish rod (38), and gas (82) is confined to the borehole annulus (18), where it can readily be recovered or vented.

L'invention concerne un système de pompage de pétrole brut (10) équipé d'une pompe de fond (22), et d'une extension (60) allant au-delà de la pompe de fond (22) proprement dite. Cette extension (60) comporte une admission (62) placée au-dessous du niveau de soutirage le plus bas (L2) qui peut être atteint avec la pompe de fond (22). L'ensemble du fluide pompé par la pompe de fond (22) pénètre dans l'extension (60) via l'admission (62); en plaçant ladite admission (62) suffisamment au-dessous du niveau de soutirage le plus bas (L2) que permet d'atteindre la pompe de fond (22), on empêche le gaz sous pression (82) de pénétrer aussi dans l'extension (60), dans la pompe de fond (22), ou dans la colonne de pompe (40) au-dessus de la pompe de fond (22). On évite ainsi que le gaz (82) ne déplace le pétrole brut (80) dans la colonne de pompe (40), ce qui permet de maintenir un excellent degré de refroidissement de la tige polie (38); par ailleurs, le gaz (82) est confiné dans l'espace annulaire du trou de forage (18), où il est possible de le récupérer ou de le ventiler.

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