Water Production Reduction by Fresh Water Injection into Watered-up Producers
AlJassasi, Hammam and Zhang, Yizhong
Engineering Honours Degree, 2013
University of Adelaide
It was widely reported in the literature that permeability reduction can be caused by the injection of low salinity water (LSW), both in reservoirs and in core water-flooding. This phenomenon has been extensively discussed and explained by lifting and migration of fine particles that strain and clog the rock. In this study, this phenomenon is further explored and exploited in a larger scale. We develop a technology for decelerating water encroachment during exploitation of oil and gas fields with strong water support. The study implements the reduction of permeability in near watered-up producers' area, by injecting LSW, to reduce and delay water invasion to the in-front wells. Industrial reservoir simulation software, Eclipse, is used to study and compare the results of injecting low salinity water into watered-up producers' case with the base case which only abandons the watered-up wells. The injection of low salinity water and fines lifting and migration are simulated in Eclipse using the polymer option as a substitute for the lack of this feature in the current software functionality. The results from simulating homogeneous and heterogeneous reservoirs, performed in the current work, show 4% increase in oil recovery, and also 5% reduction in water production when injecting LSW in abandoned producers.