RESEARCH ON GAS SEEPAGE LAW IN LAMINATED SALT ROCK GAS STORAGE
CHEN Weizhong，TAN Xianjun，WU Guojun，YANG Jianping
(State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics， Chinese Academy of Sciences，Wuhan，Hubei 430071，China)
Abstract：The sealing performance is an important technique and safety index for salt rock gas storage. For the salt rock gas storage containing weak interlayer，it is very possible that the natural gas will escape along the rock layer if appropriate measures are not adopted，which will lead to external permeability of natural gas. Gas permeability mechanism for the laminated salt rock gas storage is very complex. It is key problems to establish the permeability mechanical model and to put forward corresponding numerical method which is suitable for salt rock with weak interlayer based on seepage theory in porous media. It is assumed that the weak interlayer and salt rock are isotropic porous media. The interface between salt rock and weak interlayer is assumed as a fracture with a certain thickness. Based on the related theory，the equivalent-boundary model of the gas permeability is established. This model can reflect the fracture flow which is different from the equivalent medium model，and its computational complexity is less than that of double-permeability model. Combining with the field situation of Jintan gas storage，the pressure distributions of storage with different cyclic pressures for gas filling and gas recovery in five years are studied. The effect of permeability of interface between salt rock and weak interlayer on pressure distribution is analyzed. It is concluded that the effects of permeability on gas pressure distribution are very important. The scientific basis is provided for the design of salt rock gas storage with weak interlayer and reasonable choice of operating pressure.
陈卫忠，谭贤君，伍国军，杨建平. 含夹层盐岩储气库气体渗透规律研究[J]. 岩石力学与工程学报, 2009, 28(07): 1297-1304.
CHEN Weizhong，TAN Xianjun，WU Guojun，YANG Jianping. RESEARCH ON GAS SEEPAGE LAW IN LAMINATED SALT ROCK GAS STORAGE. , 2009, 28(07): 1297-1304.
