Volume 4, Issue 6 (June 2007)
Prediction of Strontium Sulfate Scale Formation in Oilfield Environment
An easy and reliable method for predicting a scale tendency of strontium sulfate as a function of several variables including sodium chloride brine composition, temperature, and pressure effect is developed. The effect of the amount of sulfate tied up as [MgSO40] on SrSO4 solubility is also considered. The magnesium sulfate dissociation constants and strontium sulfate experimental solubility data is fitted in mathematical equations. These equations can be easily used to determine SrSO4 scaling tendency in environments common to oil field brines. The reliability and key features of the prediction method are illustrated in the text with oilfield well cases. Results obtained using the present model are in good agreement with field observation. The method presented in this study is easy to use, reliable, and can be applied to any producing wells where SrSO4 occurs.