Compatibility study of injection water for barium sulfate scale prediction in one of Iranian oil fields
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1Department of Petroleum Engineering, Faculty of Petroleum and Chemical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
2Department of Petroleum Engineering, Faculty of Petroleum and Chemical Engineering, Science and research Branch, Islamic Azad University, Tehran, Iran
One of the most important challenges during water injection into oil reservoirs is the formation of inorganic scale due to incompatibility of injection water and formation brine. In this study, injection water compatibility study for evaluation of barium sulfate scale formation were carried out for one of the Iranian oil fields located in Persian Gulf. The laboratory experiments were performed with synthetic formation and injection waters at reservoir temperature.Sensitivity analysis was carried out on mixing ratio of formation water to injection water and injecteion water salinity to determine the condition of minimum barium sulfate scale formation. Results showed that barium sulfate scale is formed at any ratio of injection water and maximum precipitation was observed at 90% formation water. By increasing the temperature, barium sulfate solubility increases and therefore, turbidity of waters mixture was decreased. As injection water salinity is decreased, solution turbidity and the amount of sulfate scale decreased. Overall, damage potential of barium sulfate scale should be considered for water injection operation in the studied oil field.