Existing state-of-the-art diagnostic models neglect fluid inertia. Sometimes fluid inertia distorts the shape of the pump card. This is important because the shape of the pump card is used to diagnose the operating condition of the sucker rod pump, and to effectively monitor and maintain rod pumped wells. This paper presents guidelines for predicting when fluid inertia is likely to cause pump card distortion. This paper then discusses the equations, boundary conditions, and solution method for calculating fluid inertia forces and removing them from a calculated pump card.

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