Distribution of Oil, Water, and Ions Near the Neutral Calcite Surface in the Presence of Low and High Salinity Water: Molecular Dynamics Simulation
- سال انتشار: 1402
- محل انتشار: مجله علوم و فن آوری نفت، دوره: 13، شماره: 1
- کد COI اختصاصی: JR_JPSTR-13-1_002
- زبان مقاله: انگلیسی
- تعداد مشاهده: 246
نویسندگان
Amirkabir University of Technology - Mahshahr Campus, Bandar-e Mahshahr, Khuzestan, Iran
Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
School of Chemical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
چکیده
Low salinity water flooding has a significant impact on the recovery of carbonate reservoirs. In this paper, the molecular dynamics simulation was carried out to investigate the distribution of ions (Na+, Cl-, Ca۲+, Mg۲+, and SO۴۲-), water, and oil molecules near the calcite surface (the temperature of ۳۶۰ K). The results show that the polar component of oil, compared to the non-polar components, tends more to the calcite surface. Additionally, the bulk of oil in brine-containing environments gradually moves away from the surface. Water molecules exhibit simultaneous movement towards the surface, forming two distinct layers near the surface and hydrating the calcite surface. Based on the water’s radial distribution function, it can be observed that the hydrogen atom is closest to the surface within the second layer of water molecules. In contrast, the oxygen atom is in closest proximity to it in the first. Ions displayed concurrent movement towards the surface in conjunction with the motion of water molecules. The ion dispersion gives rise to the forming of an electrical double layer near the surface. Compared to other ions, the closeness of sodium and chlorine ions to the surface leads to creating a layer with a positive charge. The presence of an electrical layer induces the migration of polar oil molecules from the surface. The distribution of Mg۲+ and Ca۲+ ions indicates that Mg۲+ has a stronger surface accumulation tendency than Ca۲+.کلیدواژه ها
Carbonate Reservoir, Low Salinity Water, Ions, Molecular Dynamics Microscopic Displacement in the Reservoir. LSWFاطلاعات بیشتر در مورد COI
COI مخفف عبارت CIVILICA Object Identifier به معنی شناسه سیویلیکا برای اسناد است. COI کدی است که مطابق محل انتشار، به مقالات کنفرانسها و ژورنالهای داخل کشور به هنگام نمایه سازی بر روی پایگاه استنادی سیویلیکا اختصاص می یابد.
کد COI به مفهوم کد ملی اسناد نمایه شده در سیویلیکا است و کدی یکتا و ثابت است و به همین دلیل همواره قابلیت استناد و پیگیری دارد.