E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 37/10 (2006.01) E21B 23/00 (2006.01)
Patent
CA 2442223
A self-propelled swabbing device for use in removing liquid from within an installed wellbore casing to surface is disclosed. The device includes a longitudinally extending plunger sized to fit within the wellbore casing, and has an internal flow passage extending longitudinally therethrough. The device further includes a seal between the plunger and the casing and a valve stem having a valve stop operative to be shuttled between an opened position and a closed position to seal the internal flow passage. The stem extends longitudinally through the plunger to form a piston and sealed chamber maintained at a pressure below that desired for closing the valve. A biaser is further included for biasing the valve in the opened position until a set pressure is reached, whereby the valve stop is shuttled to the closed position and flow through the internal flow passage is stopped.
Balen Robert Mark
Gowling Lafleur Henderson Llp
LandOfFree
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