Abstract

Offshore gas processing and dehydration must deliver high reliability, low emissions, and cost effectiveness under harsh, variable conditions. This paper proposes a conceptual framework that integrates thermodynamic analysis, process intensification, digital monitoring, and sustainability assessment to optimize dehydration efficiency in offshore facilities handling associated and non-associated gas streams. The framework links multi-scale energy and exergy evaluation with equipment selection, heat recovery, control strategy design, and lifecycle decision making. Core elements include: (1) a digital twin that fuses first-principles models with data-driven surrogates for rapid scenario testing; (2) a decision matrix for selecting between triethylene glycol, molecular sieves, membranes, or hybrid layouts based on dew-point targets, footprint, energy intensity, corrosion risk, and hydrate propensity; (3) an exergy-based heat-integration plan that recovers waste heat from compression and power generation; and (4) reliability-centered maintenance informed by condition monitoring and failure-mode analysis. Methodologically, the framework applies pinch and exergy analyses to quantify avoidable losses, Monte Carlo propagation to treat metocean-driven feed variability, and multi-criteria decision analysis to balance efficiency, operability, safety, and environmental impacts. A cyber-physical layer enables closed-loop optimization using soft sensors and model predictive control to stabilize regenerator duty, lean-solvent purity, adsorber cycling, and membrane stage cuts under turndown, slugging, and fluids compositional shifts. Sustainability is embedded through lifecycle KPIs, including water-removal efficiency, specific energy consumption, methane and CO₂ intensity, solvent make-up, corrosion index, and hydrate-incident frequency. These indicators aggregate into a Dehydration Sustainability Index that supports explicit trade-offs across technical, economic, and ESG dimensions. Implementation proceeds via baseline auditing and data cleansing; model calibration and uncertainty quantification; KPI benchmarking against best available techniques; pilot trials of heat recovery and hybrid units; and phased roll-out with operator training, cybersecurity, and governance. Expected outcomes include 10–25% energy reduction from heat recovery and advanced control, 30–50% solvent-loss reduction via optimized regeneration and mist elimination, fewer hydrate-related upsets, and verifiable cuts in venting and flaring, subject to site constraints. The framework is adaptable to brownfield tie-backs and greenfield topsides, and scalable across asset classes. By aligning rigorous thermodynamics with pragmatic operability and sustainability metrics, it enables resilient, low-carbon, high-efficiency offshore dehydration and gas processing.