Hasian P. Septoratno Siregar
With the current low oil price, efforts must be directed toward optimizing current production and looking for appropriate and cost effective EOR method. One of the most cost effective alternative methods compared to thermal/chemical, is utilization of available water and gas. Produced hydrocarbon gas is often flared/vented because uneconomic for sale or own produce and positive impact for production however this practice is now systematically reduced due to stringent environmental regulation. CO2 is also a growing concern and its release to atmosphere needs to be reduced. Those concerns motivate efforts to inject back hydrocarbon gas and CO2 into reservoir in form of EOR or CO2 storage. Gas injection is among the oldest EOR method and particularly effective for reservoir with high relief where gravity drainage is dominant. However continuous gas injection mode still inherit drawbacks due to density difference between gas and oil with recovery factor typically in range of only 10-20% OOIP after waterflood. The problem is more pronounced in heterogeneous formation where permeability contrast exist, leading to much lower recovery efficiency.
Penerapan Karya Tulis
Low oil price. CO2 is also a growing concern and its release to atmosphere needs to be reduced.