Energy analysis and evaluation method study of natural gas gathering and transportation system

The natural gas gathering and transportation system, composed of well site, gas gathering and separating station, booster station, gas pipeline networks and gas field water reinjection station, is a complex energy system in accordance with a certain topological structure of Zero convergence and it is one of the major energy-using sectors for gas producing.The energy model in existing process system is not fully applicable to natural gas gathering system, and then the gathering and transportation system is divided into four segments containing energy conversion, energy transmission, energy utilization and energy recovery by improving "three links" energy structure model of the process system.From the two perspectives of energy balance and exergy balance with the "three box" energy analysis method, the "Combined module multi-link analytical method" is proposed for a general energy consumption process.Energy analysis on a gas gathering system is conducted, energy-saving entry point of the gathering system is determined, and adjustment and reconstruction measures are proposed.The secondary index system and evaluation criteria of every energy sub segment is construct, the index weight levels using the Improved APH is determined, and Fuzzy Comprehensive Evaluation Model of a gathering system is established.