低渗透压裂井网两相渗流分析  

Two-Phase Porous Flow of Hydraulic Fracturing Patterns in Low Permeability Oil Reservoirs

作　　者：王明[1] 朱维耀[1] 李继山[2] 王志平[1] 许坚[2] 

机构地区：[1]北京科技大学土木与环境学院,北京100083 [2]胜利油田有限责任公司地质科学研究院,山东东营257015

出　　处：《中国矿业大学学报》2010年第5期779-783,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(10772023);国家重点基础研究发展计划(973)项目(2007CB209500)

摘　　要：依据低渗透油田压裂开发过程中流体在不同流动区域内的不同流动特征建立了基质渗流区、裂缝控制区及裂缝的三区物理模型.建立了三区耦合理论模型:基质渗流区内依据平面径向非定常渗流规律建立了考虑启动压力梯度的非达西渗流模型;裂缝控制区内依据扰动椭圆建立了基质-裂缝耦合的椭圆渗流模型;裂缝内依据二项式渗流模型建立了高速非线性流动模型,推导出了低渗透油藏不同压裂井网两相渗流数学模型.试验区不同压裂井网开发效果分析表明:菱形反九点井网的开发效果最佳,其次是矩形井网、正反九点井网,正五点井网开发效果最差.Based on the different flow characteristics in different flow regions during fracturing development in low permeability oil reservoirs,the three districts physical model including matrix seepage zone,fracture control zone and inner fracture was developed.A theoretical model of three districts coupling was found：non-Darcy flow model in consideration of the threshold pressure gradient based on the areal unsteady radical flow law in matrix seepage zone;elliptical flow model of matrix-fracture coupling based on disturbance ellipse in fracture control zone and high velocity non-linear flow model based on a binomial flow model in fracture.The two-phase porous flow mathematics models of hydraulic fracturing patterns were developed in low-permeability oil reservoirs.The development effect of different hydraulic fracturing patterns in pilot block was analyzed.The result shows that the development effect of the reverse rhombus nine-spot well pattern is the best,in comparison with the rectangular pattern,the reverse square nine-spot well pattern and the normal five-point pattern.

关 键 词：低渗透 压裂 井网 两相 椭圆流法 启动压力梯度 

分 类 号：TE348[石油与天然气工程—油气田开发工程]