大庆石油地质与开发2018，Vol.37Issue(1)：159-164,6.DOI:10.19597/J.ISSN.1000-3754.201703060
致密油储层边界层影响因素及渗透率下限实验
EXPERIMENTS ON THE INFLUENCING FACTORS OF THE BOUNDARY LAYER AND PERMEABILITY LIMIT FOR THE TIGHT OIL RESERVOIR
摘要
Abstract
The permeability of the tight oil reservoir is extremely low,the structures of the pore and throat are complex and moreover their radii are rather small,and further more the existence of the boundary layer will further increase the seepage resistance and have a great influence on the reservoir seepage.In order to study the influencing factors of the boundary layer of the tight reservoirs,the testing method with the help of N2 flooding,the relationships between the pressure gradient,the pore and throat radii and the permeability and the boundary layer were by analyzed.The study achievements show that with the increases of the pressure gradient and the permeability,the thickness of the boundary layer and its occupancy rate decline in the form of the power law,the influence on the reservoir seepage weakens gradually.With the decrease of the pore and throat radii,the thickness of the boundary layer increases first and then decreases,and furthermore there is the maximum value of the thickness,however when the thickness occupancy rate of the boundary layer is gradually increased,the influence on the reservoir seepage is also enhanced gradually;the permeability lower limit and the empirical formula were obtained by the fitting under different pressure gradients,the greater the pressure gradient is,the lower the permeability lower limit will be.Based on the above researches,for the tight reservoir,the deep understandings have been achieved for the influencing factors of the boundary layer and the permeability lower limit,which have provided the theoretical basis for improving the influence of the boundary layer on the tight reservoir seepage and determining the reasonable production pressure differential.关键词
致密油储层/边界层/压力梯度/孔喉半径/渗透率下限Key words
tight oil reservoir/boundary layer/pressure gradient/pore radius/lower permeability limit分类
能源科技引用本文复制引用
马铨峥,杨胜来,孟展,王璐,钱坤,韩伟..致密油储层边界层影响因素及渗透率下限实验[J].大庆石油地质与开发,2018,37(1):159-164,6.基金项目
国家重点基础研究发展计划(973)项目“提高致密油储层采收率机理与方法研究”(2015CB250904) （973）
国家自然科学基金项目“致密油储层基质渗吸规律及原油动用机理研究”(51574257). （51574257）
