Abstract
Electric Submersible Pumps (ESPs) are a widely preferred solution for artificial lift, particularly in high water-cut wells. This study investigates troubleshooting and optimization techniques for ESP installations, with a focus on the applications of Advanced Gas Handlers (AGH) and Variable Speed Drives (VSD). It examines two case studies: the Waha field equipped with an AGH and the Sarir field employing an oversized pump. The primary objectives include leveraging AGH capabilities to reduce tubing costs and enhance production rates, as well as optimizing oversized pump performance while evaluating the impact of surface chokes on ESP power efficiency compared to VSD adjustments. Using Prosper software for simulation and performance evaluation, along with Affinity laws to analyze pump behavior under varying conditions, the study offers valuable insights. Findings for the Waha field indicate that the current installation of the AGH at a pump depth of 5,340 ft is unnecessary, as the gas-liquid ratio can be effectively managed with a standard pump intake. Relocating the pump to a shallower depth of 2,800 ft is recommended, resulting in a production rate of 4,272.3 bbl/d, controlled gas fraction of 39% within AGH capacity, and significant cost savings on cable and tubing. In the Sarir field, an oversized pump was initially regulated using a 36" choke to achieve a target production rate of 2,834 STB/d at 150 psi wellhead pressure. However, adjusting the pump speed via VSD to 43.9 Hz proved more efficient, saving an excess head of 616 ft and reducing power consumption, thus enhancing operational performance without relying on surface chokes. This study underscores the effectiveness of AGH and VSD technologies in optimizing ESP operations. Strategic adjustments to pump depth and speed can significantly improve production efficiency and reduce operational costs, particularly in high water-cut environments. Keywords: Electric submersible pump, Advanced Gas Handler, Variable Speed Drive, Wellhead choke.
Published Version
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