水侵气藏型储气库注采相渗滞后数值模拟修正方法  

Numerical simulation-based correction of relative permeability hysteresis in waterinvaded underground gas storage during multi-cycle injection and production

作　　者：朱思南 孙军昌[3,4] 魏国齐 郑得文 王皆明[3,4] 石磊 刘先山[3,4] ZHU Sinan;SUN Junchang;WEI Guoqi;ZHENG Dewen;WANG Jieming;SHI Lei;LIU Xianshan(University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Porous Flow&Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China;PetroChina Research Institute of Petroleum Exploration&Development,Langfang 065007,China;Key Laboratory of Oil and Gas Underground Storage Project of China National Petroleum Corporation,Langfang 065007,China)

机构地区：[1]中国科学院大学,北京100049 [2]中国科学院渗流流体力学研究所,河北廊坊065007 [3]中国石油勘探开发研究院,河北廊坊065007 [4]中国石油天然气集团有限公司油气地下储库工程重点实验室,河北廊坊065007

出　　处：《石油勘探与开发》2021年第1期166-174,共9页Petroleum Exploration and Development

基　　金：中国石油重大科技专项“地下储气库地质与气藏工程关键技术研究与应用”(2015E-4002)

摘　　要：以天然岩心气水多周期互驱相渗测定实验为基础,揭示了储气库多周期注采相渗滞后效应,结合Carlson和Killough经典相渗滞后理论,建立了水侵气藏型储气库多周期注采相渗滞后数值模拟修正方法,并通过建立的中低渗透砂岩水侵气藏型储气库地质模型,系统研究了多周期注采相渗滞后效应对储气库流体宏观分布规律和生产运行指标的影响。研究表明:水侵气藏型储气库高速注采运行过程中存在相渗滞后效应,该效应的存在使储气库气水过渡区宽度、厚度增加,高效储气区不断收缩,含气孔隙体积峰值变化幅度减小,进而降低储气库的库容、工作气量及高效运行寿命等;数值模拟中若不考虑相渗滞后效应的影响,预测的储气库运行指标将存在较大误差,采用Killough和Carlson方法可对储气库相渗滞后效应进行修正,提高预测精度,其中Killough方法对实例模型的适应性更好。By conducting relative permeability experiments of multi-cycle gas-water displacement and imbibition on natural cores,we discuss relative permeability hysteresis effect in underground gas storage during multi-cycle injection and production.A correction method for relative permeability hysteresis in numerical simulation of water-invaded gas storage has been worked out using the Carlson and Killough models.A geologic model of water-invaded sandstone gas storage with medium-low permeability is built to investigate the impacts of relative permeability hysteresis on fluid distribution and production performance during multi-cycle injection and production of the gas storage.The study shows that relative permeability hysteresis effect occurs during high-speed injection and production in gas storage converted from water-invaded gas reservoir,and leads to increase of gas-water transition zone width and thickness,shrinkage of the area of high-efficiency gas storage,and decrease of the peak value variation of pore volume containing gas,and then reduces the storage capacity,working gas volume,and high-efficiency operation span of the gas storage.Numerical simulations exhibit large prediction errors of performance indexes if this hysteresis effect is not considered.Killough and Carlson methods can be used to correct the relative permeability hysteresis effect in water-invaded underground gas storage to improve the prediction accuracy.The Killough method has better adaptability to the example model.

关 键 词：水侵气藏 储气库 多周期注采 相渗滞后 模型修正 指标预测 

分 类 号：TE82[石油与天然气工程—油气储运工程]