F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
F04B 15/02 (2006.01) E21B 43/16 (2006.01) F04B 47/12 (2006.01)
Patent
CA 2232890
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.
Bennett Jones Llp
Conn Kenneth S.
LandOfFree
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