Wells – With eduction pump or plunger
Reexamination Certificate
2006-09-19
2006-09-19
Tsay, Frank S. (Department: 3672)
Wells
With eduction pump or plunger
C166S112000
Reexamination Certificate
active
07108059
ABSTRACT:
The present invention is directed to a downhole pump assembly having a housing, a standing valve located near the lower end of the housing, a plunger disposed in the chamber of the housing below the upper and lower internal shoulders thereof and adapted for reciprocating movement through at least a portion of the chamber of the housing, and a traveling valve located in the plunger. A pull rod has one end connected to the plunger and an opposite end connected to a sucker rod string to affect reciprocating movement of the plunger. A sliding valve is positioned in a chamber of the housing between an upper internal shoulder and an internal shoulder. The sliding valve moves in an upward direction upon upward movement of the plunger so that fluid passes around the sliding valve, and the sliding valve moves in a downward direction upon downward movement of the plunger to restrict the downward flow of fluid through the chamber of the housing so that the pressure above the traveling valve is less than the pressure below the traveling valve to cause the traveling valve to open. The pull rod is provided with a plurality of vertical grooves so that the vertical grooves extend through the sliding valve near the end of the downward movement of the plunger to cause the pressure above the sliding valve and the pressure below the sliding valve to be substantially equalized so that the sliding valve is caused to move in the upward direction upon upward movement of the plunger.
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Dunlap Codding & Rogers P.C.
Tsay Frank S.
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