摘要
由于低渗透油藏渗流规律的复杂性,传统的一维小岩芯非线性渗流实验研究并不能完全反映出流体在二维方向上的非线性渗流规律。采用低渗透天然平板露头制作低渗透平板物理模型并进行非线性渗流实验,将实验结果与从平板露头上钻取的小岩芯的非线性渗流现象进行对比,结果表明:低渗透平板物理模型渗流规律表现出非线性特征,其非线性程度比小岩芯更加明显。通过对低渗透平板模型压力系统稳定时间与驱替压力梯度之间的关系分析,进一步验证了低渗透储层非线性渗流特征的存在,并且从微观角度阐明了非线性渗流机理。
Because of the complexity of the law of nonlinear porous flow in low permeability reservoir,the traditionalexperiment with the one-dimensional core can not completely reflect the nonlinear porous flow in two-dimensionaldirection. The nonlinear porous flow experiment with the two-dimensional physical model that made of natural rockand the nonlinear porous flow experiment with one-dimensional core are carried out. It is showed that the nonlinearphenomenon exists in two-dimensional physical model and the nonlinear phenomenon of the physical model isstronger than that of the core. By the analysis of the relationship of the pressure steady time and the displacementpressure gradient,we further verify the existence of the low permeability nonlinear seepage characteristic,anddemonstrate the mechanism of the nonlinear porous flow with microcosmic method in low permeability reservoir.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2011年第6期101-104,208-209,共4页
Journal of Southwest Petroleum University(Science & Technology Edition)
基金
国家重大油气专项"特低渗透油藏有效补充能量技术研究"子课题(2008ZX05000–013–02)
关键词
低渗透油藏
非线性渗流
启动压力梯度
物理模拟
压力系统
low permeability reservoir
nonlinear seepage
actuating pressure gradient
physical model
pressuresystem
