Sand check filter

摘要

A sand check filter for preventing solids from reentering into a pump. The filter is designed to mount atop a conventional rod pump. The filter allows well fluid, that contains high solids, to pass through the pump under normal operation while eliminating the solids from being swept back into the pump barrel. The filter includes a sleeve that has radial flutes that allows the sleeve from hanging up, sticking to or wedging itself to the valve rod. The sleeve is rotated on the valve rod to create a valve effect atop the filter. This prevents the fluid from passing through the inner diameter of the screen and forces solids within the fluid to be redirected to the outer diameter of the filter. This allows the fluid to be filtered before reentering the pump.

主权项

1. An assembly for use with a pumping system comprising:
a top portion; a middle portion; a bottom portion; a screen filter for removing solids from fluid being pumped, wherein the screen filter is positioned within the middle portion, leaving a space between an outer diameter of the screen filter and an interior surface of the middle portion; a first filter cap positioned between the bottom portion and the middle portion for holding the screen filter in position; a second filter cap positioned above the screen filter for holding the screen filter in position; a sleeve positioned between the second filter cap and the top portion; and a plurality of radial flutes formed on an interior surface of the screen filter, wherein the radial flutes create a cyclone effect on the fluid being pumped, the cyclone effect allowing the fluid being pumped to pass from an internal diameter of the screen filter to the space between the outer diameter of the screen filter and the interior surface of the middle portion while retaining the solids from the fluid being pumped within the screen filter and forcing the solids upward through the internal diameter of the screen filter.