Abstract: Today the recovery factor in sandstone and carbonate reservoirs not exceeds 40% and in several cases not more that 30% (reservoirs with heavy oil). In these cases, traditional waterflooding when formation brine is injected has run out of its possibility. However, depending on the reservoir conditions a number of EOR methods can be applied to improve oil recovery. The low salinity waterflooding is one of the latest Improved Oil Recovery (IOR) methods. In literature it is known as Smart wateflood, LoSal and Advanced ion Management. This method implies reduction of the salinity of injected water. This technique demonstrated increased oil recovery up to 40%. Most researches have shown positive results in secondary and tertiary low salinity injection modes. Many mechanisms have been proposed to be behind improved oil recovery due to LSW. However, wettability alteration and fine migration is believed to be main reasons. Complex interactions between oil/brine/rock in carbonate and sandstone rocks dont allow predicting the amount of incremental oil because of LSWF. Nowadays there are only few papers dedicated to the possibility of implementation of LSW in heavy oil sandstone reservoirs. The objective of this study is to use simulator and investigate the injection of low salinity water injection into reservoirs with heavy oil in secondary mode. As a result LSW yielded up to 18% of incremental oil recovery compared to traditional formation brine flooding.
Ilyas K. Turgazinov and Talgat A. Ensepbayev, 2018. Numerical Simulation of High Viscous Oil Recovery by Low-Salinity Water Injection. Journal of Engineering and Applied Sciences, 13: 2780-2785.