ASP Flood in Mangala Oil Field: From Pilot to Field Scale Implementation

Abstract Mangala oil field located in the state of Rajasthan in western India, is one of the largest onshore oil fields in the country. The field was discovered in 2004 and is estimated to have ~ 1.3 billion barrels of oil in place. Production from Mangala began in 2009 and the field has been under active polymer flood for the last 10+ years. Recovery factor from the field till date (Jan 2026) stands at approximately 40 % of the STOIIP. EOR screening & laboratory studies clearly suggested that Mangala is an excellent candidate for both polymer & ASP flood. Full field polymer flood has been ongoing in Mangala since 2014 and has shown excellent results. Also, an ASP flood pilot was cond ucted in the field in 2014. The pilot showed excellent results and the producer exhibited a significant drop in water cut with ASP injection. As polymer flood in the field has reached a mature stage with ~1 PV of polymer injection, commencing ASP flood was the most suitable choice to maximize recovery. ASP flood is being implemented in a phased manner. The 1st phase of field implementation of ASP flood commenced in 2024 and the 2nd phase is expected to commence in 2026. The paper captures in detail the comprehensive planning, execution and initial performance of the 1st phase of ASP flood in the field. The paper discusses the subsurface, wells & surface facility aspects of the area of the field targeted. Reservoir management & surveillance plan being implemented in the field to monitor ASP flood performance is outlined and all the surveillance data acquired recently like IFO/PLT/saturation logs etc. to monitor oil bank movement and flood performance is discussed. Subsurface and operational challenges faced during ASP implementation are discussed along with mitigation strategies. Early results indicate favorable responses in producers, including water cut reduction and oil gain. Some scaling issues have been observed in a producer also. As Mangala field transitions from polymer to one of the world's largest full field ASP flood, robust reservoir management and surveillance will be critical to maximizing recovery and project success. The paper also highlights key learnings from the pilot and how they were applied to the field-scale deployment.