Inverted Shroud for Submersible Well Pump

摘要

A well pump assembly includes rotary pump and a submersible motor. A shroud surrounds the pump intake and the motor. The shroud has an open upper end in fluid communication with the pump intake. A tubular member of smaller diameter is secured to and extends downward from a lower end of the shroud. The tubular member may have an open lower end for drawing well fluid along a lower flow path up the tubular member to the pump intake. An upper flow path at the upper end of the shroud may have a minimum flow area that is smaller than a minimum flow area of the lower flow path. The tubular member has a smaller outer diameter than an outer diameter of the shroud. The tubular member may have a closed lower end to define a debris collection chamber with a drain valve.

主权项

1. A well pump assembly, comprising:
a pump having a pump intake and a discharge for connection to a string of tubing; a submersible motor operatively engaged with the pump for driving the pump; a shroud surrounding the pump intake and the motor, the shroud having an open upper end in fluid communication with the pump intake for drawing well fluid along an upper flow path down the shroud into the pump intake; and a tubular member extending downward from a lower end of the shroud below the motor and having a smaller outer diameter than an outer diameter of the shroud, the tubular member being in fluid communication with a portion of the shroud surrounding the motor.