基于随机变径毛细管束模型的渗吸-驱替机理分析  

Analysis of imbibition-displacement mechanism basedon random variable-diameter capillary bundle model

作　　者：高涛 王香增 王锰[1] 党海龙 刘芳娜 GAO Tao;WANG Xiangzeng;WANG Meng;DANG Hailong;LIU Fangna(Research Institute of Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an City,Shaanxi Province,710065,China;Shaanxi Extra Low Permeability Oil and Gas Field Exploration and Development Engineering Technology Research Center,Xi’an City,Shaanxi Province,710065,China;Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an City,Shaanxi Province,710065,China)

机构地区：[1]陕西延长石油(集团)有限责任公司研究院,陕西西安710065 [2]陕西省特低渗透油气田勘探与开发工程技术研究中心,陕西西安710065 [3]陕西延长石油(集团)有限责任公司,陕西西安710065

出　　处：《油气地质与采收率》2023年第5期100-109,共10页Petroleum Geology and Recovery Efficiency

基　　金：陕西省科技统筹创新项目“延长难采储量有效动用开发技术研究”(2016KTCL01-12);陕西省创新能力支撑计划项目“非常规油藏低碳环保提高采收率技术创新团队”(2023-CX-TD-31)。

摘　　要：针对等直径毛细管束模型的不足,结合分段法推导得到考虑压差及固-液壁面作用的液-液系统下变径毛细管多段式渗吸理论公式,研究不同毛细管几何结构和流体性质的变化对变径毛细管渗吸-驱替的影响,并通过Python编制随机变径毛细管束模型,建立基于该模型的采出程度及含水率计算方法。结果表明:压差的增大导致变径毛细管段间渗吸速度差异减小,变径毛细管渗吸-驱替具有方向性;基于随机变径毛细管束模型计算的采出程度及含水率与实验真实岩心驱替数据符合较好,且渗吸作用对总采出程度的贡献量达19.97%。In view of the shortcomings of the equal-diameter capillary bundle model,this paper theoretically derives the multi-segment imbibition formula of the variable-diameter capillary under the liquid-liquid system considering pressure difference and solidliquid wall effect by using the sectioning method.In addition,the paper studies the influence of changes in different capillary geometry and fluid properties on the imbibition-displacement of the variable-diameter capillaries and develops a random variable-diameter capillary bundle model through Python,so as to deduce calculation methods of the recovery and water cut based on this model.The results show that the increase in pressure differences leads to the decrease in the differences of the imbibition velocities between variable-diameter capillary segments,and the imbibition-displacement of the variable-diameter capillaries is directional.The recovery and water cut calculated based on the random variable-diameter capillary bundle model are in good agreement with the real core displacement data from experiments,and the contribution of the imbibition effects to the total recovery reaches 19.97%.

关 键 词：变径毛细管束 渗吸-驱替模型 温和注水 特低渗透油藏 致密储层 

分 类 号：TE357.6[石油与天然气工程—油气田开发工程]