Presenters
L. Douglas Patton, Lufkin Foundry and Machine Company
In recent years, a mathematical technique has been developed to analyze pumping-well performance using a digital computer to determine load-displacement conditions at the downhole pump and at intermediate depths in the rod string. Subsurface dynagraphs generated by the computer program are used to evaluate: pump intake pressures; gas interference or fluid pound; mechanical malfunctions in the pump, packer or tubing anchor; stresses at junction points in tapered rod strings; to name a few applications. This paper describes the analysis of the subsurface dynagraphs and discusses several case histories where the technique has been successfully applied.