Set the mobility-control objective
Reservoir engineering defines the target mobility relationship, polymer concentration range and injection strategy. Convert those objectives into laboratory viscosity, water compatibility and injectivity criteria.
Do not choose polymer from viscosity alone. The candidate must reach the injection well cleanly and remain within the demonstrated reservoir window.
Build a representative water matrix
Test actual injection water, planned pre-treatment and forecast blends. Record monovalent and divalent ions, TDS, pH, iron, oxygen control and temperature.
Use the matrix to identify viscosity loss, haze, precipitation or filterability changes before a large field trial.
Age under relevant conditions
Condition solutions at reservoir or surface exposure temperature for agreed periods and oxygen-control conditions. Measure viscosity with the same method and shear rate.
A short ambient test cannot support a claim of long-term thermal or chemical stability.
Quantify mechanical degradation
Measure viscosity before and after representative mixers, pumps, filters and restrictions. Inspect the equipment route for avoidable high-shear points.
Use retained viscosity and injectivity evidence to choose concentration and hardware, not a generic molecular-weight ranking.
Stage the field introduction
Begin with documented make-down, filtration and injection controls. Monitor solution concentration, viscosity, filter pressure, wellhead pressure, rate and produced-fluid response.
Use defined hold points and stop criteria. Unexpected injectivity or solution-quality changes require diagnosis before increasing concentration.
Preserve project traceability
Link every bulk lot to the approved sample, COA, receiving check and prepared-solution data. Record water and equipment changes alongside polymer performance.
This separates reservoir response from product, water, preparation and mechanical causes during a long program.