Determination of Scale Formation in Iranian Oil Reservoir During Water Injection Process

Document Type : Research Note

Authors

School of Chemical, Petroleum and Gas Engineering, Semnan University, P.O. Box 35195-363, Semnan, I.R. IRAN

Abstract

The Pitzer model was used to predict the quantity and kind of scales for some cases of sea and formation water. These scales are formed because of injection incompatible water with the formation water or change in temperature and pressure. These scales are barium sulfate, strontium sulfate, calcium sulfate)gypsum and anhydrate( that create many problems in oil reservoir or in producing well. Obtained results showed that maximum amount of scales are formed for higher ratio of formation water to sea water and often amount of strontium sulfate is greater than other scales. Also due to more solubility of gypsum, amount of anhydrate is ignorable. With increasing temperature, amount of strontium sulfate and calcium sulfate increases and barium sulfate decreases and increasing pressure, decreases supersaturation and amount of sulfate scales. For temperature and pressure condition in this research, effect of pressure is less than other parameters. The various calculation results demonstrated that the proposed model is in good agreement with the reported field observation.

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References

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