混合无机纳米孔内流体运移规律研究  

Study on fluid transport in mixed inorganic nanopores

作　　者：高明玉 刘丹 董志立 梁爽 王京坤[1,2] 罗鑫 GAO Mingyu;LIU Dan;DONG Zhili;LIANG Shuang;WANG Jingkun;LUO Xin(Department of Petroleum Engineering,Northeast Petroleum University,Daqing 163318,Heilongjiang,China;Key Laboratory of Oil and Gas Recovery Enhancement Ministry of Education,Northeast Petroleum University,Daqing 163318,Heilongjiang,China;PipeChina Oil&Gas Pipeline Control Center,Beijing 100013,China;The Eighth Oil Production Plant of Daqing Oilfield Co.,Ltd.,Daqing 163514,Heilongjiang,China;The Fourth Oil Production Plant of Daqing Oilfield Co.,Ltd.,Daqing 163511,Heilongjiang,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆163318 [3]国家管网集团油气调控中心,北京100013 [4]大庆油田第八采油厂,黑龙江大庆163514 [5]大庆油田第四采油厂,黑龙江大庆163511

出　　处：《能源化工》2023年第5期38-44,共7页Energy Chemical Industry

基　　金：国家自然科学基金青年科学基金“页岩油赋存状态及油水流动机制研究”(51804078)。

摘　　要：基于分子动力学模拟方法,构建了伊利石-二氧化硅的混合矿物模型和以辛烷为代表的页岩油模型,通过分析流体在狭缝中的赋存状态和流动特征开展混合无机纳米孔内流体运移规律研究,结果表明,狭缝表面对流体会产生吸附作用,且随孔径增大,吸附层数量及密度先增大后稳定,大孔径内流体更容易被驱动。混合无机纳米孔内存在负滑移,通过增大压力梯度或升温的方式可将其转化为正滑移,即边界处不流动的黏滞层厚度有所降低,利于纳米孔中流体流动。油水两相流动时,相对于烷烃,壁面优先吸附水分子,在含水率较低时,壁面附近存在水膜,壁面处水膜会减弱壁面对烷烃相互作用,水膜厚度越大,屏蔽效果越明显。Based on the molecular dynamics simulation method,the mixed mineral model of illite-silica and shale oil model represented by octane are constructed.Fluid migration in the mixed inorganic nanopores is studied by analyzing the occurrence and flow characteristics of fluid in the slit.The results show that the slit surface adsorbs fluid,and the number and density of adsorbed layers increase first and then stabilize with the increase of the pores size.Fluid in large aperture is more easily driven.Negative slippage exists in the mixed inorganic nanopores,which can be converted into positive slippage by increasing the pressure gradient or temperature.The thickness of the non-flowing viscous layer at the boundary is reduced,which is conducive to the fluid flow in the nanopores.When oil-water two-phase flow occurs,water molecules are preferentially adsorbed on the wall compared to alkanes.When the water content is low,water membranes near the wall are observed.Water membranes at the wall weaken the interaction between alkanes on the wall.The thicker the water membranes are,the more obvious the shielding effect is.

关 键 词：分子动力学模拟 吸附 辛烷 滑移 

分 类 号：TE319[石油与天然气工程—油气田开发工程]