Comprehensive evaluation of deliquification efficiency in complex gas wells with multiple criteria: from transient response to full life cycle

This study develops a comprehensive multi-criteria evaluation framework for assessing deliquification efficiency in complex gas wells, integrating static and dynamic parameters across the full life cycle. A classification system using the Analytic Hierarchy Process (AHP) categorizes wells into three classes based on normalized and entropy-weighted indicators. An evaluation model incorporating 11 indicators assesses short-, medium-, and long-term performance via an entropy-weighted grey correlation model and TOPSIS method, yielding a comprehensive score (Ci). Field applications demonstrate tailored strategies: Class I wells (Ci ≥ 0.65) employ pressure-controlled production with nanoparticle foam; Class II wells (0.45 ≤ Ci < 0.65) use composite foam deliquification and cycle optimization; Class III wells (Ci < 0.45) require acid descaling and artificial lift. Results show optimized wells achieve 15%–40% higher production efficiency and a 22% improvement in EUR prediction accuracy, supporting effective deliquification in unconventional gas fields.