«Equipment and technologies for oil and gas complex»

Investigation of hydrodynamic processes in the plunger – cylinder pair of a sucker rod pump

UDC: 622.276.53
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: sucker rod pump, clearance of the plunger – cylinder pair, CFD modeling, leaks in the plunger – cylinder pair, sealing devices of sucker rod pumps

Annotation:

The authors of the article consider the problem of leakage in the plunger – cylinder pair of a sucker rod pump. The leakage processes in the plunger pair of the sucker rod pump (SRP) was comprehensively studied using physical testing and numerical modeling. The results of numerical simulations and bench tests of a sucker rod pump with a nominal diameter of 44 mm (fit 4), equipped by plungers rods with trapezoidal grooves and smooth (without grooves) surfaces were obtained on model fluids of different viscosities. The dependences of the model fluids leakages corresponded to those of heavy crude oils. The study revealed the dependences of leakages volumes on the key test parameters of testing: pressure drops, fluid viscosity and plunger geometry. A high degree of consistency between physical and numerical investigation results was obtained. The experiments confirmed the linear dependence of leakages volume on pressure and demonstrated the significant influence of fluid viscosity on the efficiency of the clearance seal. The results proved the fact that trapezoidal grooves presence on the plunger surface has virtually no effect on the leakage volume. The analysis of the obtained results demonstrates the possibility of using numerical studies to determine the efficiency of plunger pair’s gap seals various designs of the sucker rod pump.

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