Journal
FUEL
Volume 262, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2019.116560
Keywords
Shale oil; Water film; Liquid-liquid slip; Quartz nanopores
Categories
Funding
- China Scholarship Council (CSC)
- Westgrid
- Compute Canada
- National Science Foundation in China [51674279, 51804328, 51974348, 51974347]
- Shandong Province Natural Science Foundation [ZR2018BEE008, ZR2018BEE018]
- Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education
- Fundamental Research Funds for the Central Universities [19CX05005A-1, 18CX06010A]
- China Postdoctoral Science Foundation [2019T120616]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN2017-05080]
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The knowledge about the underlying mechanisms of oil transport behavior with the presence of thin water film in hydrophilic quartz nanopores is crucial to oil migration and production in shale/tight oil reservoirs. In this work, we use molecular dynamic (MD) simulations to study the flow of nC(8) in quartz nanopores with the presence of thin water film under a reservoir condition (323 K and 20 MPa). We observed the formation of layering structure of water near the surfaces, while in nC(8)-water interface region, weakly ordered nC(8) structures form. In addition, a rapid change of fluid velocity, which is the typical feature of liquid-liquid slip, was observed in the nC(8)-water interface region. We also found that such liquid-liquid slip can be non-negligible in small nanopores. The apparent viscosity of total liquids in the nC(8)-water interface region can be only half of those of bulk water and nC(8), while the flux contributions of water and nC(8) in the nC(8)-water interface region are independent of pore sizes. Our work should shed lights into oil migration mechanisms with the presence of thin water film and provide important insights into the theoretical and numerical models for shale/tight oil production predictions.
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