Squeeze treatments are often scheduled on a calendar because the last one lasted about that long. Lifetime is predictable from chemistry and transport, and predicting it is cheaper than an unplanned intervention.
1. Establish the scaling risk quantitatively
Saturation indices for the relevant species across the expected temperature and mixing envelope, not at a single design point. Barium sulphate risk in particular is dominated by mixing ratio, which changes through field life.
2. Set MIC from dynamic testing
Minimum inhibitor concentration determined under representative conditions defines the squeeze target. Static bottle tests understate requirement in high-shear or high-temperature systems.
3. Model adsorption/desorption, not just volume
Return concentration is governed by the isotherm, rock mineralogy, pH of the overflush and shut-in time. Pumping more inhibitor without adjusting the pill chemistry or overflush design extends cost more than lifetime.
4. Design the placement
- Preflush to condition wettability and pH.
- Main pill volume based on the target radius of penetration.
- Overflush sized to place inhibitor beyond the near-wellbore drawdown zone.
- Shut-in period long enough for adsorption to complete.
5. Monitor and recalibrate
Residual sampling against the predicted return curve tells you whether the isotherm assumption held. Two calibrated squeezes usually produce a field-specific model good enough to plan intervention windows — the workflow supported by our scale prediction and squeeze design software.
Chemistry selection for the pill itself is covered in selecting production chemicals.