盐穴储气库天然气阻溶恒压运行技术

Constant-pressure operation technology for salt cavern gas storage through solution mining under gas

盐穴储气库作为天然气管网的配套设施,其高效运行对于保证管网平稳供气作用巨大。恒压运行是盐穴储气库采用流体置换方式进行天然气注采的新模式,注采过程中腔内压力相对稳定,不需要垫底气,较为安全经济。但这种注采模式需要大量的饱和卤水置换天然气,注气阶段采出的卤水需要极大的存储空间或卤水处理设备,大大降低了该模式的经济性和可操作性。为此提出一种将天然气阻溶造腔与恒压运行有效结合的新工艺,其既能实现恒压运行,又无需对置换介质进行处置,具有良好的应用前景。2018年,该技术在中国金坛盐穴储气库进行了先导试验,并取得成功。(图7,表2,参17)

The efficient operation of salt cavern gas storage, as an ancillary facility of the gas pipeline network, is of great significance to ensure the stable gas supply of the pipeline network. Constant-pressure operation is a new gas injection and production mode of salt cavern gas storage with fluid replacement, which is economic for the pressure in the cavern is stable, and no base gas is required during the process of gas injection and production. However, in this mode, a large amount of brine is required for the replacement of natural gas, and a very large storage space or treatment plant is required for the brine produced during gas injection. Thus, the economy and operability of the mode will be reduced greatly. Herein, a new technology effectively combining the solution mining under gas(SMUG) and constant-pressure operation is introduced, with which not only the constant-pressure operation can be realized, but also no treatment is required for the replacement medium. Therefore, the application of the new technology is very promising. The pilot test for the technology was carried out in Jintan Salt Cavern Gas Storage in 2018, having a great success.(7 Figures, 2 Tables, 17 References)