| 摘要 |
A downhole reciprocating plunger pump includes an elongated tubular cylinder member which may be made of high-density polyethylene. A bottom inlet valve cage member is threadedly connected to the lower end of the cylinder and includes a reduced diameter portion which, together with the cylinder, forms an annular trash collection space. The pump plunger is connected to an elongated tubular plunger rod which is connected to the pump rod string extending within the well and receive working fluid discharged from the pump chamber through the plunger rod for discharge through ports in the rod into the interior of the cylinder and a tubing string connected to the pump. An elongated sleeve is detachably connected to the upper end of the plunger and forms an annular trash collection chamber with the plunger rod. Detachable valve seats connected to the bottom cage and the plunger, as well as the bottom cage and the plunger, may be formed of thermoplastic.
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