盐穴储气库无垫底气技术探讨

Discussion on the no cushion gas technology of salt-cavern gas storage

杨海军 周冬林 杜玉洁 姜海涛 于青青 张凯峰

YANG Haijun ZHOU Donglin DU Yujie JIANG Haitao YU Qingqing ZHANG Kaifeng

中国石油天然气股份有限公司盐穴储气库技术研究中心 华北石油管理局有限公司江苏储气库分公司

PetroChina Research Center of Salt-Cavern UGS Technology, Zhenjiang 212000, Jiangsu, China Jiangsu Gas Storage Branch, PetroChina Huabei Petroleum Administration Co. Ltd., Zhenjiang 212000, Jiangsu, China

盐穴储气库运行过程中垫底气始终无法采出，增加了储气库工程建设成本，降低了储气库运行经济效益。基于盐穴储气库注气排卤技术经验，提出了盐穴储气库无垫底气技术。从储气库运行方式、腔体利用效率、建设成本、建设地质门槛和腔体长期稳定性等方面，对无垫底气运行和常规运行两种方式进行了对比，并以2个储气库为典型代表，给出了薄盐层和深部盐层利用2种不同技术建库的对比案例。结果表明，无垫底气技术可以大幅度提高盐穴储气库腔体利用效率，显著降低盐穴储气库工程建设成本，降低盐穴储气库建设地质门槛，有利于腔体长期稳定性运行，该研究可为我国盐穴储气库建设带来更好的效益。

In the operation process of salt-cavern gas storage, cushion gas can never be recovered, which increases the engineering construction cost of gas storage and decreases its economic benefit. A cushion gas free technology of salt-cavern gas storage was put forward based on the gas injection & brine discharge technologies and experience of salt-cavern gas storage. Then, the cushion gas free operation mode was compared with the conventional operation mode from the aspects of gas storage operation mode, cavity utilization rate, construction cost, construction geological threshold and long-term cavity stability. Finally, taking two gas storages as the typical representatives, storage construction cases in thin salt beds and deep salt beds by means of two different technologies was compared. It is indicated that the cushion gas free technology can greatly increase the cavity utilization rate of salt-cavern gas storage, significantly decline its engineering construction cost, decrease its construction geological threshold and promote the long-term stable operation of cavity. The research results can bring better benefits to the construction of salt-cavern gas storages in China.

10.13639/j.odpt.2020.04.022