Paper: Effect Of Input Data Errors On Diagnostic Analysis Of Rod Pumps

When interpreting the output of wave equation based computer programs, one must be able to accurately detect problems and recommend solutions. Several papers have been published describing techniques for calculation of gearbox loading, rod stresses, and downhole pump dynamometer cards. Included in these papers are downhole dynamometer card shapes corresponding to common pump problems that can be compared with calculated pump dynamometer cards to determine what is wrong with the pump* However, these techniques assume that the input data is correct. This paper addresses interpretation errors that occur due to wrong input data. It discusses the effect of input data errors on key calculated parameters and how the analyst can detect them.