Paper: MODIFIED EVERITT-JENNINGS ALGORITHM WITH DUAL ITERATION ON THE DAMPING FACTORS

In rod pumping wells, the downhole data can be computed from the surface data by solving the one dimensional damped wave equation. Currently, the modified Everitt-Jennings method uses finite differences and an iteration on the damping factor to solve the one dimensional damped wave equation. The iteration on the damping factor allows for an automatic damping factor adjustment, which can be a valuable tool when dealing with large fields of wells. The damping factor pertaining to this method is a common damping factor for both the upstroke and downstroke. In this paper, a new iteration on the damping factor is presented, in which the algorithm is split such that the upstroke and the downstroke damping factors are refined separately. Results are presented.