相国寺石炭系气藏改建地下储气库运行参数设计

相国寺气田位于重庆市渝北、北碚区境内。该气田石炭系气藏地理位置优越，储层分布稳定，储层渗流性好，气质纯，气井产能高，井间连通性好，开发中表现出视均质气藏特征，盖层和断层封闭性好，水体能量有限，地层水不活跃，非常有利于改建地下储气库。为此，在比较了枯竭气藏改建地下储气库与气藏开发的异同之后，根据相国寺地下储气库的定位及调峰需求（主要用于解决川渝地区天然气市场的季节调峰问题，可为中卫-贵阳管线提供季节调峰，同时具备天然气战略储备应急能力），利用该气藏丰富的静态资料和长期开发的动态资料，优化设计了储气库的上限压力、下限压力、库容量、工作气量、垫底气量、注采井数等关键运行参数。模拟结果表明：相国寺气田石炭系气藏改建地下储气库后，运行压力介于11.7～28.0 MPa，库容量可达40.5×10⁸ m³，垫底气量为17.7×10⁸ m³，工作气量为22.8×10⁸ m³，储气库具备较强的调峰能力。最后还对该储气库的注采方案进行了设计分析。

Operation parameter design of the Xiangguosi underground gas storage based on the Carboniferous gas reservoir

The Xiangguosi Carboniferous gas reservoir in the northern Chongqing area is well situated with steady reservoir distribution,favorable reservoir penetrability,pure gas quality,high gas well yield,and good connectivity between wells.It demonstrates features of apparent homogeneous reservoirs with cap rocks and faults providing good sealing abilities.More than that,the water body is of limited energy and the formation water is inactive.That is why the reservoir is a proper option for the establishment of underground gas storage.The Xianguosi gas storage is built with the purpose of strategic reserves storage and seasonal peakshaving for the Zhongwei-Guiyang Pipeline or the gas markets in Sichuan and Chongqing areas.In view of this,this paper first makes a comparison between developing gas reservoirs and building underground gas storage based on depleted gas reservoirs Then,based on the static and dynamic data from this storage,an optimal design is made of the key operation parameters,including the upper and lower limits of the storage pressure,storage capacity,working gas volume,cushion gas volume,amount of injection-production wells,etc.The simulation results show that after the Xianguosi gas storage is built on the Carboniferous gas reservoir,its peaking shaving capacity will be excellent with the operation pressure of 11.7-28.0 MPa,storage capacity of 40.5×108 m3,cushion gas volume of 17.7×108 m3,and working gas volume of 22.8×108 m3.In the end,this paper also analyzes the design of the reservoir injection-production schemes of this storage.