裂缝性碳酸盐岩油藏相对渗透率曲线  

The relative permeability curve of fractured carbonate reservoirs

作　　者：廉培庆[1,2] 程林松[2] 刘丽芳[2] 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油大学石油工程学院,北京102249

出　　处：《石油学报》2011年第6期1026-1030,共5页Acta Petrolei Sinica

基　　金：国家自然科学基金项目(No.90210019);教育部高等学校博士学科点专项科研基金项目(20060425001);教育部新世纪优秀人才支持计划项目(NCET-05-0108)联合资助

摘　　要：裂缝油水相对渗透率曲线的研究对指导裂缝性油藏注水开发起至关重要的作用。笔者应用某碳酸盐岩油藏天然岩心进行油水相对渗透率实验,对基质岩心进行造缝,对比了造缝前后的岩心相对渗透率曲线形态的差别:造缝后油水相对渗透率曲线下降(上升)较快,残余油饱和度较大,且残余油饱和度下水相相对渗透率高,油水共渗区变窄,最终驱替效率变小;对同一块天然裂缝性岩心相对渗透率曲线的应力敏感特征进行了研究:随着围压增大,相对渗透率曲线的束缚水饱和度变大,残余油饱和度变化程度较小,等渗点下降,驱替效率变小。数值模拟计算结果显示,使用围压较大条件下的相对渗透率计算,含水率较低,在相同开发期限内阶段采出程度降低。Oil-water relative permeability curve of fractures is very important in the waterflooding process of naturally fractured reservoirs.We conducted experiments on the oil-water relative permeability of carbonate cores from the earbonate reservoir and compared differences in the relative permeability curve between natural matrix cores and artificial fracturing cores.The experiment result shows that after the fracturing process the oil-water relative permeability curve rises or drops more dramatically,the relative permeability at the isopotal point gets higher,the saturation of remaining oils gets bigger,a two-phase flow area of the tested cores becomes narrower and the final displacement recovery efficiency decreases.Stress sensitivity characteristics of the relative permeability curve for the same naturally fractured core were also studied,and the result showed that with the effective confining pressure increasing,the irreducible water saturation of the relative permeability curve increased,while the residual oil saturation just changed a little,the isopotal point moved downward and the displacement efficiency declined.Numerical simulation results indicated that the water cut would decrease under a higher confining pressure,and recovery factor would decrease at the same development time.

关 键 词：裂缝性油藏 相对渗透率曲线 围压 人工造缝 采出程度 

分 类 号：TE344[石油与天然气工程—油气田开发工程]