摘要
矿场试验和实验表明低渗油藏流体渗流不再符合Darcy公式而是存在明显的非线性,这种非线性效应对单相、多相流体的流动均产生影响。从非线性渗流的形成机理出发,利用恒速压汞技术确立低渗储层喉道分布密度函数,在此基础上,根据毛管模型与边界层理论,建立了低渗储层非线性相渗模型,并结合大庆油田某区块进行了分析研究。结果表明,在非线性渗流压力梯度范围内,地层中压力梯度的增加,储层绝对渗透率逐渐增加、水相渗透率逐渐降低,油相渗透率逐渐升高,油井含水率上升速度降低。
The oilfield trial and experiment study show that the mechanics of fluids flow does not conform to Darcy formula in low permeability reservoirs.There is obvious non-linear seepage flow in the low permeability reservoir.The non-linear seepage flow has effect on the flowing of single phase fluids or two phase fluids.The study of this paper began in the mechanism of non-linear flow.The throat distribution density function is established by constant rate mercury injection experiment.Combining with the function,based on classic capillary model and boundary layer theory,the non-linear relative permeability model of low permeability reservoir is established.The core data of Daqing Oilfield is analyzed by the above model.The results illustrate that bigger pressure gradient will result in higher oil relative permeability,lower water relative permeability and slower watercut rate in the range of non-linear seepage flow pressure gradient.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第1期78-82,13-14,共5页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家重点基础研究发展规划“973”项目(2007CB209500)
中国石油天然气股份有限公司科技项目(08-02A-02-02)
关键词
低渗油藏
非线性渗流
相对渗透率
恒速压汞
low permeability reservoir
non-linear seepage flow
relative permeability
constant rate mercury injection
