Patent ID: 6135203
Filing Date: 2000-10-24
Classification: F04B

Abstract:
A downhole reciprocating plunger well pump comprising:an elongated tubular cylinder member including an internal bore defined by a cylinder wall and means for connecting said cylinder member to a well tubing string;a cylindrical pump plunger disposed in said cylinder member for reciprocation therein;an elongated tubular plunger rod connected at one end to said plunger and at another end to an elongated rod string for reciprocating said plunger in said cylinder member; anda bottom cage member releasably connected to a lower distal end of said cylinder member, and stationary with respect to said cylinder member, said cage member including passage means therein for conducting working fluid into a pump chamber defined by said cylinder member between said bottom cage member and said plunger, said bottom cage member and said cylinder being configured to define a stationary annular space therebetween for collecting debris entrained with working fluid entering said pump chamber.