Patent ID: 6368084
Filing Date: 2002-04-09
Classification: F04B

Abstract:
A fluid pumping apparatus for conveying fluids to the earth's surface through a production string having a bottom near the producing formation and a top end connected to a flow line at the earth's surface, said apparatus comprising:a downhole pump disposed near the lower end of said production string including a tubular pump barrel and a tubular pump plunger concentrically disposed in said tubular pump barrel in a sliding and sealing fit therewith, one of said tubular pump barrel and said tubular pump plunger being fixed to said production string, the other of said tubular pump barrel and said tubular pump plunger being attached to the lower end of a string of rods for reciprocal movement between lower and upper terminal positions; said sliding and sealing fit between said tubular pump barrel and said tubular pump plunger constructed and arranged to provide a stationary seal at the bottom of the production string; a standing valve provided in said fixed one of said tubular pump barrel and said tubular pump plunger which permits flow of fluids into said tubular pump barrel but prevents flow of fluids out of said tubular pump barrel; a traveling valve provided in said other of said tubular pump barrel and said tubular pump plunger which permits flow of fluids from said tubular pump barrel into said production string; a cylindrical polished rod, the lower end of which is connected to said string of rods, said cylindrical polished rod extending upwardly through sealing means located above the flow line for sliding and reciprocation therethrough, the diameter of said cylindrical polished rod being as great as the outside diameter of said tubular pump plunger; and power means operatively connected to said cylindrical polished rod for lifting and lowering said cylindrical polished rod and said string of rods to lift and lower said other of said tubular pump valve and said tubular pump plunger between said lower and upper terminal positions, whereby fluids are pushed through said production string into said flow line as said other of said tubular pump barrel and said tubular pump plunger is lowered from said upper to said lower terminal position and whereby no fluids are pushed through said production string to said flow line as said other of said tubular pump barrel and said tubular pump plunger is lifted from said lower to said upper terminal position.