F - Mech Eng,Light,Heat,Weapons – 04 – B
Patent
F - Mech Eng,Light,Heat,Weapons
04
B
166/27
F04B 15/02 (2006.01) E21B 43/12 (2006.01) F04B 47/02 (2006.01) F04B 53/10 (2006.01)
Patent
CA 1267835
"OIL WELL DOWNHOLE LIQUID INJECTION ASSEMBLY" ABSTRACT OF THE DISCLOSURE A downhole pump is actuated by a reciprocating unit comprising a tubular rod string, a valve assembly, and a tubular plunger rod. A flow passage extends through the reciprocating unit when the valve assembly is in an "open" position, whereby liquid may be injected into the pump barrel chamber to ensure the presence of incompressible fluid in the chamber from the beginning of the up stroke, to thereby reduce or eliminate gas locking of the pump. The valve assembly, which moves together with the reciprocating unit of which it is part, is adapted to interact with a stop member on the stationary pump barrel, to initiate opening of the valve as the rod string approaches the bottom of its stroke. The valve assembly is further adapted to automatically close when lifted away from the stop shortly after the beginning of the up stroke. The valve thus remains open only during the bottoming out phase of the stroke, when only limited travel of the reciprocating unit occurs. The valve assembly is adapted to accommodate this limited travel while remaining open.
542233
Anderson Clifford J.
Bland Linden
342975 Alberta Ltd.
Johnson Ernest Peter
LandOfFree
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