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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. [ABSTRACT FROM AUTHOR]

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The natural gas market has entered a stage of rapid development in Zhejiang province, and six supply systems of gas source mixed transportation will be gradually formed during the twelfth five-year period. The diversification of gas source has improved the security of natural gas supply system and the interchangeability of different gas sources, however, must been taken into consideration when getting into the main pipeline network due to the differences of natural gas origin, production process, and gas source, especially the air components and characteristics between natural gas and liquefied natural gas. Using Wobbe index method and America Gas Association (A.G.A) method, the interchangeability of five major sources of natural gas in Zhejiang province was analyzed. Referring to the foreign methods of solving gas interchangeability problem, solutions of gas pipeline network supply under the structure of gas source mixed transportation in Zhejiang province are put forward. [ABSTRACT FROM AUTHOR]