Plunger adapter with sandwiper for downhole pump

摘要

A downhole reciprocating pump assembly for pumping wellfluids from a wellbore has a cylindrical barrel and a plunger disposed within the barrel. A plunger adapter for such pump assembly is configured to allow passage of sand or other particles through the adapter and into a central bore of the plunger so that it does not enter the space between the outer wall of the plunger and inner wall of the barrel of the pump assembly.

主权项

1. A plunger adapter for coupling to the upper end of a plunger of a downhole reciprocating pump having a cylindrical barrel with the plunger disposed within the barrel, the plunger adaptor comprising:
an upper connector section having a central bore with a threaded rod engagement portion for engaging threads of a threaded end of a rod of a rod string; an intermediate section having a neck joined at an upper end to the upper connector section and an annular cylindrical collar that joins a lower end of the neck, the collar having an outer diameter that is greater than the width of the upper connector section and neck, the collar terminating at an upper end in an annular lip or flange that longitudinally overlies a lower portion of the neck, the annular lip or flange sloping downwardly and radially inward towards the lower end of the neck to form a sandwiper to facilitate collecting and directing sand and other particles away from the periphery of the collar, at least two fluid passages being formed in the neck that are longitudinally spaced apart from one another, wherein each fluid passage extends radially inward and axially downward from the exterior of the neck to an axially-extending central fluid passage formed in the intermediate section; and a lower section located below and joined to the intermediate section, the lower section being configured for coupling to the upper end of the plunger and having a central fluid passage that communicates with the central passage of the collar.