Abstract
ABSTRACT A digital discrete model, similar to the analog model investigated by Midwest Research, has been developed to study pumpoff, pumping with anchored tubing, and gas interference downhole conditions. The calculated surface dynagraphs are presented for unanchored tubing, anchored tubing, 60% gas interference, 20 gas interference, and 80% pumpoff. This model is similar to the analog model pioneered by Howe and Midwest Research. However, because it uses a digital simulation, a wide variety of downhole conditions can be modeled. The upper limit on the frequency of this model (which also applies to RP11L calculations) is also presented.
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