OLI applies electrolyte thermodynamics to model corrosion, scaling, phase equilibria, and contaminant chemistry across oil and gas assets. From high-pressure wells to refinery overhead systems, our simulations reflect real process conditions and provide the foundation for operational and design decisions. Scale, corrosion, gas sweetening and produced water treatment are expressions of fluid chemistry. Many operational risks and performance limitations originate in how chemistry evolves across wells, topside facilities, produced water treatment facilities and refineries. OLI translates complex chemistry and multiphase behaviour into first-principles modeling frameworks that predicts chemical speciation and phase interactions, enabling operators to design and operate grounded in thermodynamics. Used by operators and engineering teams to evaluate corrosion mechanisms, assess scaling potential, and support compliance planning using rigorous, first-principles chemistry modeling.