储层应力敏感性动态变化对低渗透油藏产能的影响  

The effect of dynamical stress-sensitivity variation of reservoirs on the productivity of low permeability oil reservoir

作　　者：寇根[1] 王厉强[2] 李彦[3] 赵子刚 肖再红 

机构地区：[1]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000 [2]成都理工大学"油气藏地质及开发工程"国家重点实验室,四川成都610059 [3]胜利工程设计咨询有限责任公司,山东东营257026 [4]中国石油青海油田分公司采油一厂,甘肃敦煌816400

出　　处：《油气地质与采收率》2007年第3期101-104,118,共4页Petroleum Geology and Recovery Efficiency

摘　　要：基于低渗透非达西和变形介质渗流理论及对流函数形态的分析,推导了低渗透线性变形油藏饱和及未饱和状态下的无因次流入动态通式。在考虑储层应力变化导致变形系数和启动压力梯度动态变化的前提下,对影响无因次流入动态的因素进行了敏感性研究。结果表明,低渗透油藏中启动压力梯度、污染程度、供给半径和平均地层压力对无因次流入动态都有较显著的影响,同时应力变化可显著改变敏感性分析结果。结合准噶尔盆地莫北低渗透油田的测试数据认为,应用该方法能有效评价与应力敏感性相关的储层参数变化对流入动态的影响,无因次流入动态方程及考虑储层应力变化的敏感性分析结果可为低渗透储层的现场实践提供理论依据。Base on the theory of non-Darcy flow and deformed media percolation in the low permeability reservoir and the analysis of the shape of Kro/(Boμ) function,a universal dimensionless IPR equation is derived for saturated and undersaturated linear deformation low permeability oil reservoirs.Furthermore,sensitivity of factors which influences the IPR curve is studied when considering the dynamic variation of deformation coefficient and start-up pressure with reservoir stress.The study shows that the start-up pressure gradient,skin factor,supply radius and average reservoir pressure have a remarkable effect on IPR in low permeability oil reservoirs.At the same time,change of stress can significantly impact the result of sensitivity analysis.Combined with the testing result of low permeability Mobei Oilfield of Juggar Basin,this method can effectively evaluate the influence of variation of reservoir parameters,which are stress sensivity,on IPR curve.The dimensionless IPR equation and the result of sensitivity research based on the change of reservoir stress can provide theoretical foundation for field practice in low permeability reservoirs.

关 键 词：低渗透 变形系数 启动压力梯度 流入动态 

分 类 号：TE348[石油与天然气工程—油气田开发工程]