Plunger lift system
AssigneeStellarton Technologies Inc.
InventorsRyan AMIES, Grant GEORGE
Life of this patent
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Abstract
An intermittent lift plunger includes at least one seal mandrel, a bottom sub and an upper valve assembly. The valve assembly is closed by a well bottom stop which inserts into the lift plunger and opened by a lubricator stop at the top of the well. The seal mandrel includes a sleeve seal formed from an elastomeric rubber or plastic, which inflates to engage the well bore surface when the valve is closed and a pressure differential exists.
Claims9
A plunger having an upper end and a lower end, and defining an internal chamber, for intermittently lifting fluids from a well having a bottom well stop means, said plunger comprising:
- (a) at least one hollow cylindrical seal mandrel disposed between the upper end and lower end, wherein the seal mandrel defines a plurality of openings;
- (b) a resilient seal sleeve attached to the seal mandrel in a fluid-tight manner, covering the seal mandrel openings;
- (c) a valve assembly disposed at the upper end of the plunger, above the seal mandrel, comprising a valve body defining a valve opening, a valve stem and valve slidingly disposed within the valve body which valve is moveable between a first position wherein the valve opening is closed and a second position wherein the valve opening is open;
- and
- (d) wherein the valve stem is actuated by the well stop means inserting into the plunger internal chamber.
Dependencies are inferred from the claim text.