(2015012) MODIFIED EVERITT-JENNINGS: A COMPLETE METHODOLGY FOR PRODUCTION OPTIMIZATION OF SUCKER ROD PUMPED WELLS
When using artificial lift, namely sucker rod pumps, there are three major factors to consider when trying to control and optimize production: elasticity, viscous friction and mechanical friction. The Modified Everitt-Jennings uses an iteration on dual damping factors to approximate the correct amount of viscous friction to be removed to mimic the energy lost through the viscous forces imparted on the outer diameter of the rods by the fluids. A precise Fluid Load Line Calculation provides a concavity test to diagnose the presence of mechanical friction.
Secondly, in order to maximize production and prevent rod string damage, pump-off control technology must be used in conjunction with sucker rod pump installation. The most accurate type of pump-off control is one using pump fillage. The Modified Everitt-Jennings combines an in-depth stress analysis with a powerful Pump Fillage Calculation, which outputs correct pump fillage regardless of downhole conditions present.
In this paper, a complete methodology for controlling sucker rod pumps is presented. This methodology combines state of the art, innovative methods that smartly and efficiently automate the control of sucker rod pumped wells.