多周期交变载荷工况下地下储气库密封性评价

随着我国引进天然气资源的高速增长,在中亚管道投运的基础上,中俄西线天然气管道建设加快提速,急需寻找建设特大规模型地下储气库保障进口天然气供需平稳安全运行。克拉2气田是西气东输一线的气源地,距离中亚、中俄西线管线中国口岸较近,改建储气库将在季节调峰、安全平稳保供和战略储备方面发挥重要作用。为了讨论克拉2改建储气库的密封性,从盖层、断层、裂缝、溢出点、储层底板和井的完整性等方面,通过考虑逆断层的活动情况,使用断面正应力的最小值评价断层的密封性,将储层底板密封性和井的完整性纳入储气库评价体系,形成了考虑原始圈闭、钻采工程和多周期交变载荷工况下的储气库密封性评价体系。认为克拉2气田通过调整开发政策在开发末期改建为地下储气库可行,为改建储气库提供依据。

Sealing evaluation of underground gas storage in the conditions of multi-period alternating load

With the rapid development of the introduction of natural gas resources in China, the construction of the west natural gas pipeline of China-Russia was accelerated on the basis of pipeline operation in central Asia. As a result, looking for and constructing large scale underground gas storage is in need to ensure the safety of the supply and demand of importing natural gas. Being source of west-east gas line, and closing to the Chinese port of China-Asia, China -Russia pipeline, rebuilding of Kela2 gas field into underground gas storage could play the important role in seasonal peak shaving, safe and stable insurance supply and strategic reserve. To discuss the sealing of rebuilding underground gas storage from Kela2 gas field, by considering the reverse fault activity, and using minimum value of the fault section normal stress to evaluate the fault sealing, adopting the integrity of the reservoir bottom sealing and well into the gas storage evaluation system, an evaluation system considering original trap, drilling and sealing under conditions of multiple-period alternating load in this paper is constructed from many aspects of cap rock, fault, fracture, spill point, the integrity of the reservoir bottom and well, etc.. It can be concluded that rebuilding gas storage from kela2 gas field is feasible by adjusting the development policy, providing the basis referential basis for the rebuilding of the gas storage.