- Wettability modification by multi-component ion exchange, which decreases oil ionic bonding to the pore minerals.
- A pH-induced in-situ surfactant generation, interfacial tension reduction and emulsification.
- Fines migration and stripping of oil bearing fines from the pore walls.
- Plugging of predominantly water saturated pores causing diversion of injected water into less swept pore space.
The LowSal (Low Salinity WaterFlooding) method option offers both secondary and tertiary recovery benefits. In fields where significant pore volumes of aquifer water throughput have been observed, the EOR benefits of LowSal are tertiary, the 3% to 14% of OOIP range.
It’s important to note that the clay content of core materials and of the reservoirs targeted for LowSal is extremely important.