Energy and efficiency optimization in sucker-rod pumping using discrete-imitation modeling concept: application to well operations in the Bibi-Eibat field of Azerbaijan

This study is a continuation of the authors' previous works on dynamic system modeling, where a new “discrete-imitation concept” was developed. A methodology for its application to the computational modeling of “pump-well-reservoir” systems was proposed and computational studies were conducted for a hypothetical well using a simulator developed based on this concept. The relationship between pumping rate, pump fillage, and stroke speed has been thoroughly analyzed. The conditions for the transition to intermittent mode have been established. This work aims to utilize a simulator based on the author's concept to optimize a real sucker-rod pump well at very low reservoir pressure and productivity. For this purpose, Well No. 1220 at the Bibi-Heybat field (Azerbaijan) was selected. The study investigates the effects of operational parameters on overall well efficiency. The results show that increasing stroke speed to 5.0 1/min slightly improves production by 0.14%, while reducing it to 3.0 1/min increases pump fillage but reduces output. Depth adjustments show that deeper pump installations improve production, with a 8.33% increase observed at a depth of 133.3 m. Notably, intermittent operation with 28% active daily time achieves production levels comparable to continuous pumping while reducing energy consumption and costs. It has been established that increasing the stroke speed from 4 to 5 1/min and lowering the pump installation depth by 6 meters increases the production rate by 10.4%. The results ultimately confirmed the validity of the new concept. These findings also underscore the practical value of the proposed simulator in energy and efficiency optimization of sucker-rod pumping systems. Keywords: discrete imitation; reservoir modeling; pumping optimization; sucker-rod pump; stroke speed; intermittent pumping.