Development of Monitoring System For Measuring Reservoir Response After Injection Realignment Program

Salak Field currently undergoes cooling due to infield brine injection in the West area at Awi I. The modeling effort indicates that unless injection cooling is mitigated, it would lead to a significant loss in production potential at Salak field. Salak Injection Realignment Program (SIRP) intends to mitigate the cooling issues by diverting brine injectate from Awi I to proximal southeast and outfield reservoir area. This program has been implemented since the the 4th quarter of 2020.

Numerical modeling result indicates that Salak Injection Realignment Program (SIRP) has a vital role in improving long-term reservoir performance. Hence, it is critical to understand how the reservoir behaves after injection realignment started. Such massive and rapid voidage may invite marginal recharge (MR) to enter the reservoir, prevent steam cap development, and/or cools off the reservoir. Therefore, a fast and reliable early warning system is required to enable the asset management team to act accordingly.

SIRP Monitoring System (SMS) was then developed to enable quick analysis and interpretation of well behavior that can be further processed and correlated to understand reservoir behavior. SMS derived from numerical model forecast that is post-processed using WellHist (Star Energy in-house wellbore modeling tool) to provide higher resolution of data for individual well basis interpretation. SMS compares numerical model forecasted liquid pressure response with actual down-hole pressure monitoring data, as well as WellHist forecasted individual well production performance with actual production data. This information is updated automatically on a daily basis and available online for easy access to asset management team and stakeholders.