文献类型：期刊文献

英文题名：Direct Measurement of Minimum Miscibility Pressure of Decane and CO2 in Nanoconfined Channels

作者：Bao, Bo[1,2];Feng, Jia[1,2];Qiu, Junjie[1,2];Zhao, Shuangliang[1,2,3,4]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China;[3]Guangxi Univ, Guangxi Key Lab Petrochem Resource Proc & Proc In, Nanning 530004, Peoples R China;[4]Guangxi Univ, Sch Chem & Chem Engn, Nanning 530004, Peoples R China

年份：2021

卷号：6

期号：1

起止页码：943

外文期刊名：ACS OMEGA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000610993300094)】；

基金：We gratefully acknowledge the National Natural Science Foundation of China (no. 21808056) and the generous support from PetroChina Innovation Foundation (2019D-5007-0208).

语种：英文

摘要：Determining gas and oil minimum miscibility pressure (MMP) plays a vital role in the enhanced oil recovery. Injecting gases above the MMP into oil reservoirs leads to a relatively high oil recovery ratio. For conventional reservoirs, the fluid bulk MMP is measured by lab techniques such as the rising bubble approach. However, for the increasingly important tight and shale reservoirs, oil is confined in nanoscale pores. Nanoscopic MMP remains largely unknown from experiments and relies heavily on theoretical predictions. To close this gap, we developed a nanofluidic device to determine the MMP down to 50 nm by measuring the fluorescence intensity change in a nanoconfined channel. CO2 and decane are used as the working fluids, with 1% fluorescent dye for characterization. At the isothermal condition, the fluorescence intensity in decane reduces with the injecting CO2 pressure increasing, and the maximum fluorescence intensity reduction at certain CO2 pressure indicates the MMP being reached. We measured and compared CO2 and decane MMP at the bulk scale (5 mu m) and nanoscale (50 nm). The experimental results align well with literature data and theoretical predictions. Importantly, our nanofluidic approach provides a promising strategy to determine the nanoscopic fluid MMP and is readily applicable in assisting the enhanced tight/shale oil recovery.