Moyno Subsurface Progressing Cavity Pumps

An increasingly energy conscious world is seeking not only alternate energy sources but also more efficient methods of production. The drive for energy independence has created an atmosphere conductive to innovations in oil recovery. Enhanced oil recovery methods, such as water flooding, chemical treatment, and steam injection are being used to increase the production of low yield wells, which were considered
non-profitable years ago. Along with new enhanced oil recovery methods is a new and innovative artificial lift method. The Moyno Downhole progressing cavity pump has been sucessfully applied to downhole pumping applications. The pump has only one moving part, the rotor, which attaches to and is driven by the sucker rod string, while the mating stationary part, the stator, is attached to the production tubing string. The rotor is a singleT;ireaded helical gear with a circular cross section and an off set or eccentricity. stator is a double threaded internal helical gear which has a diameter equal to the rotor, but an eccentricity and pitch twice of the rotor. When the rotor and stator are meshed together, a series of sealed cavities, 180" apart, are formed, that progress from suction to discharge as the single helix rotates. The result is a pulsationless positive displacement flow. This unique progressing cavity feature enables the pump to handle high gas-oil ratio crudes without gas locking. Due to inherent low internal velocities heavy crudes of high viscosity can be easily handled. An abrasion resistant elastomer stator and plated rotor offer long life in sand laden crudes. The rotary design lends itself to low profile surface equipment allowing better utilization of the land for agriculture. These futures give the production engineer another alternative method for artificial lift,