The issues of leakage with respect to the clearance between the pump plunger outer diameter and the pump barrel inner diameter and other operation conditions have been revisited in this paper. Both Poiseuille flow rate due to the pressure difference and Couette flow rate due to the plunger motion have been considered. The purpose of this study is to better understand the nature of the leakage with respect to pressure difference, eccentricity, and motion related to the plunger of typical sucker rod pump systems. More specifically, based on the newly derived relaxation time scales for transient solutions of the governing Navier–Stokes equations, the quasi-static nature of relevant measurement techniques is confirmed for the current production systems. This key observation is also demonstrated with a computational model using the experimentally measured pressure difference and the plunger movement.
On Leakage Issues of Sucker Rod Pumping Systems
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 24, 2018; final manuscript received March 15, 2019; published online May 8, 2019. Assoc. Editor: Philipp Epple.
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Wang, S., Rowlan, L., Elsharafi, M., Ermila, M. A., Grejtak, T., and Taylor, C. A. (May 8, 2019). "On Leakage Issues of Sucker Rod Pumping Systems." ASME. J. Fluids Eng. November 2019; 141(11): 111201. https://doi.org/10.1115/1.4043500
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