Objective As the core part of gas storage, the ground system of gas storage has unstable operation conditions and high energy consumption due to the dual influence of gas injection and production. The aim of this study was to tap energy-saving potential points and solve the problems of imperfect energy efficiency evaluation system method as well as the unclear evaluation boundary of surface process system of gas storage.

Methods Combined with the current relevant standards, the Delphi method is used to establish the energy efficiency evaluation index system of gas storage ground process system covering 3 levels and 15 indices, and a set of energy efficiency evaluation method of gas storage ground process system is proposed based on the combination of analytic hierarchy process(AHP) and fuzzy function method.

Results The demonstration application shows that the energy efficiency evaluation score of the surface process system of gas storage under normal and abnormal working conditions is 74.68 and 48.68, respectively.

Conclusions The established energy efficiency evaluation index system and evaluation method can reasonably reflect the energy efficiency level, adaptability and existing problems of the surface process system of gas storage under normal and abnormal working conditions. The adoption of this evaluation method provides a basis and reference for the energy-saving work of surface process system of gas storage, and is of great significance to improve the energy efficiency level of oil and gas field enterprises and natural gas pipeline network companies.