Optimizing ESP Performance in High GVF Wells: A Case Study

This paper addresses the challenges of artificial lift in gassy formations by revising Electric Submersible Pump (ESP) designs to accommodate unexpected reservoir behavior. Initially targeting a static pressure of 8500 kPa and a productivity index (PI) of 0.05 m³/d/kPa, post-drilling evaluations revealed lower pressure and resulted higher gas volume fraction (GVF). To counter these setbacks, ESPs were repositioned below the perforation interval and reinforced with preventive hardware, such as cable guards and blast joints, to enhance system integrity. Analysis identified high GVF intake as per primary case performance. To mitigate this, the ESP depth was adjusted from to below perforation to reduce gas ingestion, enhance hydrostatic head, and improve motor cooling. Additional preventive measures, including metallurgy compatibility checks and a packer installation 500 m above the ESP, were implemented to manage gas accumulation. These modifications reduced GVF, improved static intake pressure to 8500 kPa, and increased net oil production by over 300%. The ESP run life extended by 200%, significantly reducing downtime costs by $13,200 per day.