Paper: PREDICTING SUCKER ROD LIFE

This paper presents a method to predict the life of sucker rods. It is based on the standard of maximum and minimum stress on a rod as these stresses describe the fatigue life of the rod. The result is a Constant Life Diagram for the rod (sometimes referred to as a Haigh Diagram). The step wise procedure used to construct the diagram is described as well as contrasting the other possibilities for predicting the life of the rod. The Constant Life Diagram can be constructed from laboratory data, but a more practical diagram can be constructed using field data.