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Scale Prediction Calculator

PRO

Saturation index for BaSO4, CaCO3, CaSO4 from produced water chemistry with temperature correction.

Water Chemistry (mg/L)

Ca2+ (mg/L)

Ba2+ (mg/L)

SO42- (mg/L)

HCO3- (mg/L)

TDS (mg/L)

Temperature (F)

Pressure (psi)

BaSO4 (Barite) SI

CaCO3 (Calcite) SI

CaSO4 (Gypsum) SI

How this was calculated

SI = log10(IAP / Ksp) where IAP = ion activity product and Ksp = solubility product.

Ionic strength: I = TDS x 2.5e-5 (simplified).

Activity coefficients: Davies equation for divalent ions.

Temperature correction: Ksp adjusted using van't Hoff approximation.

SI > 0: Supersaturated (scale likely). SI < 0: Undersaturated (no scale).

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