Slidable sleeve plunger

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/12 (2006.01) E21B 34/12 (2006.01) F04B 47/12 (2006.01)

Patent

CA 2567524

An improved plunger lift mechanism comprises an internal hollow body having bypass orifices that, when exposed, allow fluid to pass through during plunger descent in a downhole tube to the bottom of a production well. A slidable sleeve slides along the hollow body to close the orifices, causing the plunger to rise and carry accumulated fluid to the well surface. In addition, the present apparatus comprises surface interfaces between a slidable sleeve and a mandrel to minimize a probability of mandrel and sleeve separation during the plunger's ascent phase and a risk of plunger stall. By integrating a plunger lift having a slidable sleeve with closer limits between the slidable sleeve and an internal hollow body, and a wider plunger surface area, the present apparatus can minimize radial movement which can occur during plunger drop and when impact occurs.

Mécanisme de pompe à piston plongeur amélioré qui comprend un corps creux interne ayant des orifices de contournement qui, lorsqu'ils sont exposés, permettent au fluide de passer à travers lors de la descente du piston dans un tube au fond d'un puits de production. Un manchon coulissant glisse le long du corps creux pour fermer les orifices, obligeant ainsi le piston à monter et transporter le fluide accumulé à la surface du puits. En outre, le présent appareil comprend des interfaces de surface entre un manchon coulissant et un mandrin afin de minimiser la probabilité de séparation du mandrin et du manchon pendant la phase ascendante du piston et le risque de décrochage du piston. En intégrant une pompe à piston plongeur ayant un manchon coulissant pourvu de bornes de resserrement entre le manchon coulissant et le corps creux interne, et une zone de surface du piston plus large, le présent dispositif a la capacité de réduire les mouvements radiaux qui peuvent survenir lors de la chute d'un piston et lorsqu'un impact se produit.

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