摘要
致密多孔介质微观结构复杂,受孔隙表面和流体分子之间相互作用影响的微观效应普遍存在,而目前已有的致密多孔介质模型未同时考虑边界层效应和微观效应,计算结果误差较大。基于毛细管束模型和分形理论,建立了考虑微观效应的渗透率模型来表征致密多孔介质中流体传输能力,并用实验数据验证了模型。模型计算的有效渗透率不再是恒定值;压力梯度、润湿性、流体黏度和孔隙结构参数都影响有效渗透率,边界区域和体相区域的贡献随着最大孔隙半径、润湿性和压力梯度的变化而变化。该模型能更准确地预测致密多孔介质在各种条件下流体的渗流特性,为致密油藏的开发提供指导。
Tight porous media has a complex microstructure,and microscopic effects affected by strong interaction between pore surface and fluid molecules are widespread.However,the existing dense porous media models do not consider boundary layer effect and microscopic effect at the same time,and calculation result has a large error.Based on capillary bundle model and fractal theory,a permeability model is established to characterize the fluid transport capacity in tight porous media considering microscopic effects,and the model is verified with experimental data.The effective permeability calculated by the permeability model considering microscopic effects is no longer a constant value.Pressure gradient,wettability,fluid viscosity,and pore structure parameters all affect the effective permeability.Contributions of interfacial region and bulk region vary with the maximum pore radius,wettability and pressure gradient.The model in this study can more accurately predict the fluid flow characteristics of tight porous media under various conditions,and provides guidance for the development of tight oil reservoirs.
作者
吴兵
陈希
田坤
乔向阳
王永科
辛翠平
WU Bing;CHEN Xi;TIAN Kun;QIAO Xiangyang;WANG Yongke;XIN Cuiping(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an,710075,China;Engineering Technology Research Institute of PetroChina Xinjiang Oilfield Company,Karamay 834000,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2022年第1期56-62,共7页
Petroleum Geology & Oilfield Development in Daqing
基金
陕西省重点研发计划项目“致密气藏产水气井产量优化技术研究”(2021GY-167)。
关键词
微观效应
致密多孔介质
分形理论
有效渗透率
microscopic effects
tight porous media
fractal theory
effective permeability
作者简介
第一作者:吴兵,男,1994年生,硕士,助理工程师,从事油气田开发研究。E-mail:962504643@qq.com。
