Which mechanism reduces a progressing cavity pump's efficiency during hydraulic fracturing when pumping abrasive proppant slurry?

💡 Explanation

When pumping proppant slurry, abrasion of the stator's elastomeric material in a progressing cavity pump increases clearance between the rotor and stator, causing increased slippage and reduced volumetric efficiency because more of the fluid bypasses the pumping chambers backwards. Therefore increased slippage occurs, rather than changes in shear rate, friction, or decreased viscosity.

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