Spontaneous imbibition characteristics of shale oil reservoir under the influence of osmosis
作者机构：Key Laboratory of Unconventional Oil&Gas DevelopmentChina University of Petroleum(East China)Ministry of EducationQingdao 266580China School of Petroleum EngineeringChina University of Petroleum(East China)Qingdao 266580China PetroChina Dagang Oilfield CompanyTianjin 300280China
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2022年第9卷第5期
页 面：48-58页
核心收录：
学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程]
基 金：funded by the National Natural Science Foundation of China(52274056 51974348)
主 题：Shale oil Spontaneous imbibition Osmosis Water saturation Capillarity
摘 要：The spontaneous imbibition(SI)process in shale oil reservoirs is not only infuenced by capillary force,but also by the osmotic pressure between the fracturing fuid and formation water in the nanopores *** this study,experimental methods are used to investigate the mechanisms of osmosis in the SI,taking into account the presence of initial formation water in shale oil *** investigate the efect of osmosis,SI experiments were performed on the fne-grained felsic shale of the Qikou sag of Dagang ***-feld NMR testers and high-precision electronic balances are utilized for the measuring of oil–water *** results show that,when Sw≠0,high-salinity fuid SI can be divided into four stages:initial imbibition stage,drainage stage,secondary imbibition stage and stationary stage;when Sw=0,there is no drainage stage of high-salinity fuid SI;when Sw≠0 or Sw=0,low-salinity fuid SI can be called the“osmosis-enhanced SI;and we have found that“newly formed pores or microfracturesas well as reducing salinity can promote *** article presents a systematic study of SI of shale oil reservoirs under the infuence of osmosis,which provide useful information for reservoir numerical simulation and development program design.
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