Effect of Fluid Buoyancy on Rod String Loads and Stresses

The purpose of this article is to review the effect of fluid buoyancy has on rod stresses and rod loads. The hydrostatic pressure caused by the tubing fluids has an impact on rod stresses at the rod element level. Use of the Downhole Load Cell data can help resolve the question: What is the magnitude of the loads displayed as the downhole pump card? The efkkive force on the rods is the ideal method to display of the downhole pump cards. Some discussion will be based on dynamometer data collected on an Amerada Hess well in conjunction with SANDIA using the Glen Albert Downhole Dynamometer. The purpose of this paper is to dim the true/effective load versus stress argument for display of downhole dynamometer data and analysis of stresses on a rod element.