Abstract: Since put into operation in 2014, the Shuang 6 gas storage in Liaohe Oilfield has experienced smooth and efficient operation of "six injections and four productions". In 2018, the Shuang 6 gas storage took the lead in achieving capacity summit and expansion among CNPC's major gas storages, and at the end of the sixth gas injection period, the inventory reached 53.27×10⁸m³, with capacity reaching rate of 129%. In view of the unclear direction of the future expansion of the gas storage, starting from the geological characteristics and dynamic production analysis of the gas reservoir, comprehensively using the dynamic and static data as well as the monitoring data from observation wells, combined with numerical simulation technology, the injection-production status, pressure changes, gas-liquid interface changes, and trap sealing performance of the gas reservoir were studied, and on this basis, the potential for capacity expansion and peak shaving was evaluated. The research results show that the injection-production capacity of gas storage is getting better year by year, and the adopted vertical-horizontal well pattern has greatly improved the operation efficiency. During the process of repeated injection and production, the production of crude oil and migration of edge water are the main reasons for capacity expansion of the gas reservoir. Based on the dynamic production analysis, combined with geological characteristics of the block, 15 injection and production wells would be newly deployed. It was expected that after the implementation of the new wells, the control degree of the storage capacity could be increased to more than 95%.The research results provide a basis for on-site production management as well as capacity expansion and peak shaving, which has certain guiding significance for the construction of the same gas storages.

Key words: edge and bottom water reservoir, gas reservoir storage, well control degree, inventory analysis, capacity expansion, peak shaving, Shuang 6 gas storage