Patent ID: 6196312
Filing Date: 2001-03-06
Classification: E21B,F04B

Abstract:
A system to be installed into a subterranean hydrocarbon producing wellbore, to lift an oil rich stream of fluid to a ground surface while disposing of a large proportion of water, comprising:a. a casing string in the hydrocarbon producing wellbore extending downwardly through a hydrocarbon producing formation and a water absorbing formation;b. perforations into each of the hydrocarbon producing formation and the water absorbing formation;c. at least one production packer disposed immediately adjacent the water absorbing formation;d. a string of production tubing extending down to the hydrocarbon producing formation;e. a reciprocating sucker rod pumping system consisting of a top insert rod pump to lift an oil rich stream to the ground surface, said top insert rod pump having an intake for oil rich production fluid to enter the pump when said pump is on an upstroke, a bottom tubing pump to dispose of a large proportion of water to the water absorbing formation when said pump is on the upstroke, a dual hold-down to hold the pump in the production tubing and to hydraulically isolate different production streams from each other a connecting rod seal unit to hydraulically isolate the water production of the bottom tubing pump from the oil rich production of said top insert pump, a ring valve coupled to the top of said top insert pump to isolate production fluid in the production tubing from said pump when said pump is on a downstroke, intakes to each of the two pumps separated by a distance, facilitating oil/water gravity separation of produced hydrocarbon fluids in the wellbore before the produced hydrocarbon fluids separately reach said intakes, and at least one connecting rod coupling said two pumps; andf. a sucker rod string to actuate the reciprocating sucker rod pumping system.