An optimization running analysis of bottom water drive underground natural gas storage in seasonal peak shaying

The change in seasonal city natural gas consumption decides the injection-production performance process of underground natural gas storage. Owing to the heterogeneity of geological structure used as underground natural gas storage and different capacities of storing and transmitting fluid in reservoir - if the proration for each member of the injection and production wells within the storage is unreasonable, the storage pressure may be locally increased superfast, thus causing natural gas to be lost even in danger; or the storage pressure decreased strongly, thus causing the overlying pressure upon rock matrix great increase, the bottom water coning and the original flow condition in reservoir to be reduced. According to the injection-production performance mathematical model of underground natural gas storage of bottom water drive depletion type gas reservoir which was proposed by the first author in her doctoral thesis, in the running of gas storage, the minimum power consume at compressor station and the maximum peak-shaving gas production supplied to city are taken as the objective functions in summer and winter respectively;then in light of each restrict conditions, the optimum running modes in summer and winter are set up by use of composite optimum-regulating method, thus providing a theoretical fundament for optimizing running mode of a practical underground natural gas storage in seasonal peak shaving.