Abstract: A fluid pumping apparatus for producing fluid from a well through production tubing comprises an elongate hollow body to be disposed in a well bore and at least partially submerged in fluid to be produced from the well, the body including a fluid inlet valve at its lower end for flow of fluid into the body, a plunger assembly disposed in the interior of the body for reciprocating movement relative thereto, sealing means cooperating with the plunger assembly to divide the body into isolated lower and upper chambers and to isolate the body from the production tubing, and fluid flow control valves operationally synchronized so that fluid is forced up the production tubing upon downstroke of the reciprocating plunger assembly in the body of the pumping apparatus. A method of pumping fluid utilizing the apparatus of the invention to produce fluid on the downstroke of the plunger assembly is also provided.

Abstract: A fluid pumping apparatus for producing fluid from a well through production tubing comprises an elongate hollow body to be disposed in a well bore and at least partially submerged in fluid to be produced from the well, the body including fluid inlet valve at its lower end for flow of fluid into the body, a plunger assembly disposed in the interior of the body for reciprocating movement relative thereto, sealing means cooperating with the plunger assembly to divide the body into isolated lower and upper chambers and to isolate the body from the production tubing, and fluid flow control valves operationally synchronized so that fluid is forced up the production tubing upon downstroke of the reciprocating plunger assembly in the body of the pumping apparatus. A method of pumping fluid utilizing the apparatus of the invention to produce fluid on the downstroke of the plunger assembly is also provided.

Abstract: A universal plunger for oil well pumps, which universal plunger includes a symmetrical plunger body having a longitudinal bore, a pair of threaded flange nipples projecting from end flanges located on each end of the plunger body, a pair of spaced O-ring seats provided inwardly of the end flanges, respectively, the O-rings seated in the O-ring seats, a plunger body segment of reduced diameter extending between the inner sets of O-rings and a "Teflon"-hydrocarbon composition disposed between the spaced inside O-rings, the plunger body segment and that portion of the inside surface of the oil well pump barrel which faces the plunger body segment, for sealing and lubricating the universal plunger in the pump barrel.

Abstract: A petroleum recovery pumping system comprising an improved jet pump having a nozzle assembly adapted to be selectively and reversibly installed in either an up-flow or down-flow direction, and a shoe adapted to receive and seat the jet pump adjacent to a producing zone within a well bore. The shoe is preferably further adapted to provide fluid communication between the producing zone and a power fluid discharged through a nozzle section within the jet pump. The shoe is preferably further adapted by means of circumferentially spaced, longitudinally extending passageways to provide fluid flow in an axial direction around the jet pump.