Downhole pump with bypass around plunger

Details Downhole pump with bypass around plunger Downhole pump with bypass around plunger

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 47/12 (2006.01)

Patent

CA 2312177

The downhole pump has a barrel with a reciprocating plunger therein. The barrel has a first one-way valve, while the plunger has a second one-way valve. A barrel chamber is formed between the two one-way valves. The barrel chamber expands when the reciprocal movement between the plunger and the barrel is an upstroke movement and then contracts when the reciprocal movement is a downstroke movement. A bypass channel is provided between the barrel and the plunger so as to provide communication around the plunger and its one-way valve. The bypass channel is open when the reciprocal movement is near an end of the upstroke movement. When open, pressure across the plunger can equalize and gas inside the barrel chamber can vent around the plunger and/or pressure can equalize across the plunger one-way valve so as to prevent gas lock and minimize stress on the sucker rods. The bypass channel can be provided by reducing the diameter of the lower end of the plunger, increasing the diameter of the upper end of the barrel, putting grooves in the plunger or the barrel or by making the barrel out of two sections, namely a lower section and a wider upper section and providing holes in the lower end of the plunger below the plunger one-way valve.

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