Pumps – Expansible chamber type – Valved piston
Patent
1998-03-20
2000-08-08
Walberg, Teresa
Pumps
Expansible chamber type
Valved piston
417378, 41742311, 417444, 417375, 417469, 417554, 92158, 92160, 277 58, 277 68, F04B 3910
Patent
active
060992743
ABSTRACT:
A reciprocating pump is provided for pumping subterranean fluids containing fine solids to surface. The pump comprises a pump barrel, piston and piston rod. The piston rod is suspended form reciprocating production tubing. The barrel is anchored in the casing of a well. A standing valve is located at the bottom of the barrel. The piston and travelling valve are located at the bottom of the piston rod for minimizing the dead-space between standing and travelling valves. Upper and lower stacks of hydraulic piston seal rings are positioned on the piston above and below the travelling valve for minimizing piston height. Each seal has radially flared lips at its leading edge. The piston spaced grooves formed therein, corresponding to the seal ring flared lips. At least the lower seal stack is axially movable so that the flared lips alternate between being compressed against the piston during the pumping stroke and being engaged with their respective grooves on the return stroke thereby relaxing the lips and releasing pressure trapped between the upper and lower seals. A barrel wiper at the lower seal ensures sand is excluded from the lower seal. Large bore flow passages are provided in the piston rod and valves while providing complementary piston rod and pump barrel means for enabling piston rod reciprocating motion while still rotary actuation of the anchor.
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Brochure-"Positive Seal Sand-Pump", Quinn Pump Division, Quinn's Oilfield Supply Ltd., P.O. Box 846, Red Deer Alberta, T4N 5H2, Canada; (403) 347-1128.
Brochure-"Positive Seal Sand Plunger", Quinn Pump Division, Quinn's Oilfield Supply Ltd., P.O. Box 846, Red Deer Alberta, T4N 5H2, Canada; (403) 347-1128.
Fastovsky Leonid
Walberg Teresa
LandOfFree
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