水淹枯竭气藏型储气库多周期注采气水相渗变化规律  

Gas-water relative permeability variation in multi-cycle injectionproduction of underground gas storage in flooded depleted gas reservoir

作　　者：何学良 黄世军[2] 孙常伟[2] 徐俊杰 张雄君[3] 阳小平 

机构地区：[1]中石油北京天然气管道有限公司,北京100101 [2]中国石油大学(北京)石油工程学院,北京102249 [3]北京市燃气集团有限责任公司,北京100035

出　　处：《油气储运》2015年第2期150-153,共4页Oil & Gas Storage and Transportation

摘　　要：储气库注采过程中气水过渡带上两相交互驱替的渗流特征,直接影响其注采能力和库容量,有必要开展多周期的注采气水相渗变化实验,研究气水过渡带上多周期气水交互驱替的气水运移规律和分布规律。结果表明:多周期气水互驱后,气相相对渗透率升高,水相相对渗透率降低,导致气体指进更加严重,水的残余量增大;随着注采周期的增加,气水相渗在两相区的残余气饱和度增加,加之残余水饱和度本身仍占大部分,造成储气库库容量和运行气量的损失;在多周期气水互驱过程后,束缚水对气相的渗透率影响不大,残余气对水相渗透率影响显著。The percolation characteristics of gas-water（two phase） interactive displacement on the gas-water transition zone of the injection-production process have a direct impact on the injection-production capability and storage capacity of the underground gas storage.It is necessary to make experiments on gas-water relative permeability variation in multicycle injection-production to identify the gas/water distribution and migration rules during interactive displacement on the gas-water transition zone.The results show that,the gas relative permeability increases,and the water relative permeability decreases after the multi-cycle gas-water interactive displacement,resulting in more severe gas fingering and an increase in the residual water.In addition,with the increase of injection-production cycle,residual gas saturation of gas-water relative permeability increases in the two-phase area,coupling with the residual water saturation itself accounted for the majority,have somehow resulted in the loss of gas storage capacity and active gas quantity.Finally,the bound water has little effect on the gas permeability,while residual gas significantly affects water permeability after the multi-cycle gas-water interactive displacement.

关 键 词：地下储气库 注采周期 相对渗透率 残余气饱和度 残余水饱和度 

分 类 号：TE822[石油与天然气工程—油气储运工程]