The Downstroke Pump and Special or Unusual Sucker Rod Pumps Explained

The Downstroke Pump and Special or Unusual Sucker Rod Pumps Explained This paper will explain the author’s theory of operation of the pump that lifts fluid on the downstroke, using the weight of the rods, and its loading of the sucker rod string and pumping unit. Other special sucker rod pumps will be likewise explained, using the author’s understanding, including the family of double displacement type pumps, compound compression ratio pumps, traveling barrel pumps, and others. Also discussed will be the loading changes incurred when some of these pumps are configured in the top hold down, bottom hold down or tubing pump configurations.