金坛盐穴储气库注采运行参数优化设计研究

随着国家对能源需求量的日益增加，盐穴储气库在天然气应急调峰和能源战略储备中的作用越来越大。储气库的运行参数设计决定了库区的工作气量和日常调峰能力，是影响储气库经济效益的关键因素。以金坛储气库H1井为背景，建立三维地质力学模型，对腔体下限运行压力及采气速率进行优化设计和数值模拟计算，并引入稳定性评价指标对计算结果进行检验，探讨了盐穴储气库注采参数对腔体注采运行安全性的影响。结果表明腔体稳定性随下限运行压力的升高而增加，随采气速率的升高而降低，夹层和腔顶平直处是腔体安全性的薄弱位置。该研究可为盐穴型储气库注采运行参数设计提供参考。

Optimization design of injection/production parameters of Jintan salt-cavern gas storage

With the increase of national energy demand, salt-cavern gas storage plays a more and more important role in emergency peak shaving and strategic energy reserves of natural gas. The design of the operation parameters of gas storage controls the working gas volume and daily peak shaving capacity of gas storage and is the key factor influencing the economic benefit of gas storage. A 3D geomechanics model was established by taking Well H1 of Jintan gas storage as the background, to perform optimization design and numerical simulation calculation on the lower operation pressure limit and gas production rate of the cavity. What’s more, the stability evaluation index was introduced to check the calculation results, and the influences of the injection/production parameters of salt-cavern gas storage on the cavity safety during injection and production were discussed. It is indicated that cavity stability increases with the increase of the lower operation pressure limit and decreases with the increase of the gas production rate, and the interlayers and the flat part at the cavity top are the weak positions of cavity safety. The research results provide the reference for the design of the injection/production parameters of salt-cavern gas storage.