超深海相碳酸盐岩储层气水相对渗透率实验  

Experimental study on gas-water relative permeability of ultra-deep marine carbonate reservoir

作　　者：顾少华 岑芳 张岩[3] 刘生国[4] 张广东[5] GU Shaohua;CEN Fang;ZHANG Yan;LIU Shengguo;ZHANG Guangdong(SINOPEC Key Laboratory for Marine Oil and Gas Exploration,Beijing City,102206,China;Petroleum Exploration&Production Research Institute,SINOPEC,Beijing City,102206,China;Exploration and Production Research Institute,Southwest Oil&Gas Company,SINOPEC,Chengdu City,Sichuan Province,610041,China;Downhole Service Company,Southwest Petroleum Engineering Company,SINOPEC,Deyang City,Sichuan Province,618000,China;Petroleum Engineering School,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China)

机构地区：[1]中国石化海相油气藏开发重点实验室,北京102206 [2]中国石化石油勘探开发研究院,北京102206 [3]中国石化西南油气分公司勘探开发研究院,四川成都610041 [4]中国石化西南石油工程公司井下作业分公司,四川德阳618000 [5]西南石油大学石油与天然气工程学院,四川成都610500

出　　处：《油气地质与采收率》2022年第2期117-123,共7页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金企业联合基金“深层海相碳酸盐岩油气富集机理与开发方法”(U19B6003);中国石化科技攻关项目“礁滩相高含硫气藏储层精细表征及剩余气分布规律研究”(P19036)。

摘　　要：针对超深海相碳酸盐岩储层水侵特征复杂的特点,选取基质、含溶蚀孔、天然裂缝等不同类型介质岩心开展气水相对渗透率实验研究,搭建了高温高压(150℃,50 MPa)的气水相对渗透率测试实验装置,设计了实验流程及实验方案。当实验围压分别为10,30,50 MPa时,测得不同围压对应的气水两相相对渗透率并绘制曲线,分析气水两相相对渗透率曲线随围压的变化特征。研究结果表明:当围压增大时,气水相对渗透率曲线普遍向下移动,其中,天然裂缝岩心的气水相对渗透率下降幅度更为明显;气水相对渗透率等渗点向含水饱和度小的方向移动,相对渗透率曲线形态发生变化。不同介质的气水相对渗透率曲线两相同流区宽度也存在明显差异,其中,随围压升高,含溶蚀孔岩心的两相同流区宽度变化幅度最小。该实验结果可用于解释深层碳酸盐岩气田水侵特征及气井产水现象,为该类气藏水侵规律的确定提供依据。In view of the complex water invasion characteristics of ultra-deep marine carbonate reservoirs,cores with different types of medium,such as matrix,dissolved pores,and natural fractures are selected to carry out gas-water relative permeability experiments.An experimental device with high temperature and high pressure(150℃and 50 MPa)is built,and the experimental process and scheme are designed.The gas-water two-phase relative permeability is measured under different confining pressures(10,30,and 50 MPa)to plot the relative permeability curves,and the variation characteristics of the curves with the confining pressure are analyzed.The results show that the gas-water relative permeability curves generally move downward with the increase in the confining pressure,and the gas-water relative permeability of the natural fracture core decreases more obviously.The isotonic point of the gas-water relative permeability moves in the direction of low water saturation,and the shapes of the relative permeability curves change.Obvious differences are also observed in the width of the two-phase flow zones in the gas-water relative permeability curves of different media.With the increase in the confining pressure,the width of the two-phase flow zone of the core with dissolved pores undergoes the smallest change.The experimental results can be used to explain the water invasion characteristics of ultra-deep carbonate gas fields and the water production phenomenon of gas wells and provide a basis for determining the water invasion law of such gas reservoirs.

关 键 词：超深 多重介质 碳酸盐岩 相对渗透率曲线 应力敏感 水侵 

分 类 号：TE344[石油与天然气工程—油气田开发工程]