Abstract
Enhanced Oil Recovery (EOR) methods are on the rise and Petroleum Development Oman (PDO) has successfully embarked on several projects including thermal recovery. Thermal EOR operations require rapid response and adaptation to the dynamic thermal conditions inherent within the reservoir. The challenges associated with Cyclic Steam Stimulation (CSS) necessitated a creative solution to maximize recovery and improve well management. A fit for purpose algorithm was developed to add flexibility while operating the well in combination with the Variable Speed Drive (VSD). An automation algorithm was developed to optimize oil recovery and accelerate peak oil throughout the CSS production cycle. This algorithm maximized inflow potential by creating a low fluid level above the pump and maintaining near pumped-off conditions. The project was named Beam Lift Auto Delivery Evolution (BLADE).
Live control of the pumping unit provides equipment safe guarding while ensuring continuous operation within the defined envelope. This is achieved by applying real time assessment of pump fillage and temperature conditions. This approach optimized production while maintaining adequate fillage, thereby increasing operations efficiency and prolonging pump life.
Within a thermal environment, enhanced automation provides the additional advantage of steam break through mitigation. The mitigation improves pump efficiency and prevents pump gas lock. This algorithm provided a unique advantage within this thermal operation by adapting to varying viscosities impacting inflow throughout the production phase.
Thermal CSS requires continuous monitoring and rapid reaction time to adapt to the dynamic conditions inherent to the CSS operation. The BLADE project has demonstrated that utilization of carefully designed logic in conjunction with robust field steaming strategy, not only improved field recovery but also significantly reduced manpower demand by 20% and decreased the total EOR cost.
