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- Title
硫化钼纳米片对油水界面特性的影响.
- Authors
冯阳; 侯吉瑞; 兰夕堂; 王栋森; 代磊阳; 高尚
- Abstract
It is proven that two-dimensional (2-D) black nanosheets can enhance effectively oil recovery in low permeability and tight reservoirs, showing excellent water/oil (W/O) interface characteristics. In order to clear the influence of molybdenum sulfide nanosheet, the main component of 2-D black nanosheet, on the microscopic characteristics of W/O interface, Lammps was used to establish the model of molybdenum sulfide nanosheet. Firstly, the size of molybdenum sulfide nanosheet was optimized. At room temperature and atmospheric pressure (i.e., 298 K and 1 atm), molecular dynamics simulation was conducted to investigate the effect of the selected size of molybdenum sulfide nanosheets on the oil-water interface. The adsorption morphology of molybdenum sulfide nanosheets at the oil-water interface, the effect of the intersection angle between the nanosheets and the oil-water interface on the interface, and the stress of the nanosheet were analyzed. The simulation results showed that the 30 Å ×40 Å molybdenum sulfide nanosheet had the best effect at the oil-water interface. The presence of molybdenum sulfide nanosheet affected the density, thickness, intersection angle and coverage of oil-water interface. The action mechanism of molybdenum sulfide nanosheet at the oil-water interface was clarified as follows, the stress at each point on the nanosheets affected their intersection angle, which affected the interface coverage rate. However, there was a competitive relationship between the intersection angle and the interface coverage rate, which affected the fluctuation of oil-water interface tension. This study clarified the influence of molybdenum sulfide nanosheet on oil-water interface characteristics, and laid a theoretical foundation for the study of oil displacement mechanism of 2-D black nanosheet.
- Subjects
OIL-water interfaces; MOLYBDENUM sulfides; MOLECULAR dynamics; ATMOSPHERIC pressure; ATMOSPHERIC temperature
- Publication
Oilfield Chemistry, 2023, Vol 40, Issue 3, p482
- ISSN
1000-4092
- Publication type
Article
- DOI
10.19346/j.cnki.1000-4092.2023.03.016