PCPs have been widely used to lift heavy oil and multiphase material in oil fields.
Previous approaches for slippage calculation takes too much time and they cannot be used for real-time control of PCPs. Furthermore, they cannot be adopted to liquid with low viscosity like water.
Om Il Ryong, an institute head at Faculty of Mining Engineering, and his research group have found a way to analytically calculate the hydrodynamic characters of one-lobe PCPs without using Navier Stokes equations and CFD.
First they determined the length of gaps analytically to convert axial and transversal gaps into space between parallel plates, hydrodynamic equivalence.
Then after they made some assumptions considering the structural periodicity of a PCP, they made an analytical determination of the overall hydrodynamic resistance and obtained flow rate change according to pressure differences.
Thus, they laid the foundation to rapidly calculate the slippage inside a PCP and realize the automatic control of PCP systems. Therefore, they could reduce the calculation time of 8 days in the past to less than 1 second.
He presented his essay titled “A New Analytical Approach to Calculate a Slippage inside a Progressing Cavity Pump with a Metallic Stator by Using a Middle Streamline and a Structural Periodicity” to SCI journals “SPE JOURNAL” .
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