Scale management is a sequence of small decisions, each defensible on its own: a water analysis you can audit, a saturation index you can recompute, an inhibitor you chose for a reason, a squeeze you can defend by return curve.
Start with a defensible water analysis
Sampling protocol matters as much as lab accuracy. Inconsistent sampling makes saturation indices look like noise. Specify and enforce a protocol per well type.
Compute saturation indices, don't trust a single mineral
- CaCO₃ — pH and CO₂ sensitive; common in production wells.
- BaSO₄ / SrSO₄ — incompatibility-driven; common at seawater–formation-water mixing.
- Iron sulphides — souring-driven; tied to integrity risk.
Inhibitor selection
Inhibitor chemistry must match the mineral assemblage, temperature and brine. A single "scale inhibitor" doesn't exist — phosphonates, polyacrylates, sulphonates each have a domain.
Squeeze design with a return curve
Pad, main pill, overflush, shut-in and return curve are the audit trail. Field-validated retention models — not vendor adsorption isotherms in isolation — predict the next squeeze interval.
The full workflow runs in the scale management software with mineral-by-mineral indices, inhibitor selection and squeeze design backed by field-validated return models.