Paper: The 40-Foot Stroke, Winch Type Pumping Unit

The use of a long slow stroke in rod-pumped oil wells has been the goal of prudent operators for many years. They have recognized that a major cost of operation was the repair and replacement of sucker rods, tubing, and bottom-hole pumps. Since most of these failures were the result of fatigue, corrosion fatigue, or wear, a reduction in the number and magnitude of fatigue-producing strokes would dramatically reduce their operating costs.