Gabor Takacs
University of Miskolc
Hungary
Title: Long-stroke sucker-rod pumping – available models and their operation
Biography
Biography: Gabor Takacs
Abstract
Long-stroke sucker-rod pumping units have polished rod stroke lengths greater than 24 ft and require significantly less torque than beam pumping units. To produce high liquid volumes they can be run at much lower speeds and can thus achieve greater overall system efficiencies. The general advantages of long-stroke pumping over traditional pumping can be summed as: (a) greater liquid producing capacities are achieved, (b) downhole pump problems are decreased, and (c) rod string life is substantially increased due to the reduced number of stress reversals. This paper presents a complete coverage of present-day long-stroke rod pumping methods and discusses the two main types of technologies available: Rotaflex and DynaPump. After a short historical overview of long-stroke pumping these two units are introduced and their technical and operational features are described in detail. The relative advantages and limitations of Rotaflex and DynaPump installations are summarized to facilitate their selection for artificial lift applications.