The Effect of Temperature and Pressure of the Injection Water With Formation Water on Calcium Sulfate (Gypsum, Hemihydrate, Anhydrate) Scales Formation in the Siri Oilfield

Enhanced oil recovery methods are used to recover the percents of oil that are not naturally recoverable from reservoirs. Water injection as a secondary recovery is used to maintain the pressurein water-drive reservoirs. An important point for having a successful injection is the compatibility ofinjection and formation waters. In this study, using the Scale soft pitzer software and Persian Gulf water and formation water chemical analysis has been measured in the laboratory. Scaling indexcalcium sulfate (gypsum, hemihydrate, anhydrate) at different temperatures (80-210 ◦F ) and pressure(15 - 4000 Psia) is predicted in Iran Siri oilfield. The results show that Calcium sulfate scales hasn’t been formed in siri oilfield and the amount of calcium sulfate scales with increasing temperature and reducing pressure will be raised

Keywords:

injection water , siri oilfield , scaling index , calcium sulfate , scale soft pitzer software