裂缝性低渗透油气藏压裂井压力动态特征  

Pressure behavior of fractured wells in low-permeability fractured reservoirs

作　　者：韩福成[1] 何应付[2,3] 

机构地区：[1]中油大庆油田有限责任公司,黑龙江大庆163416 [2]中油大庆油田博士后工作站,黑龙江大庆163712 [3]西南石油大学博士后流动站,四川成都610500

出　　处：《特种油气藏》2008年第4期63-65,69,共4页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金项目"低渗透气藏储层特征及流体运动渗流机理研究"资助(10672187)

摘　　要：裂缝性低渗透油气藏往往存在明显的应力敏感性,利用椭圆流动模型和平均质量守恒方法,建立考虑介质变形影响的双重介质油气藏有限导流垂直裂缝井不稳定渗流的数学模型,给出数学模型的试探解,绘制并分析了压力动态特征的典型曲线。分析结果表明,介质变形对典型曲线的中晚期形态存在影响,由于渗透率应力敏感性的存在,使得压力导数曲线偏离0.5水平线,后期拟径向流特征段消失,并且渗透率模数越大,压力及压力导数曲线上翘越大。Low- permeability fractured reservoirs are usually stress -sensitive.Based on elliptical flow model and average mass conservation,a mathematical model of unsteady percolation for wells with finite conductivity vertical fractures in double porosity reservoir is established with consideration of media deformation.Its trial solu- tion and typical pressure behavior curves are given.Analysis shows that media deformation has affected the mid -late section of the typical curve.The derivative curve deviates the O.5 horizontal line because of the existence of stress sensitivity of permeability.In late period,the pseudoradial flow disappears;moreover,the greater the permeability modulus is,the higher the pressure and the derivative curve are.

关 键 词：变形介质 双重介质油藏 垂直裂缝井 有限导流 压力动态 

分 类 号：TE348[石油与天然气工程—油气田开发工程]