Nanoparticle stabilized emulsions in enhanced oil recovery are more attractive and practical than conventional emulsions which stabilized by colloidal particles and different surfactants due to their advantages and special characteristics such as high stability in harsh condition, move long distance in reservoirs without high retention due to small size of nanoparticles. Only one third of original oil in place (OIP) is usually produced and two third of oil in place will be trapped to reservoir rockthus suitable chemical enhanced oil recovery (C-EOR) methods should be used. In this research, we have suggested a novel, economical and commercial method for synthesis N-doped graphene quantum dots (N-GQDs)/MoS₂ quantum dots (MQDs) nanohybrids for preparing different percentage of Nanoemulsions which can reduce alterfacial tension significantly so it can used for Enhanced Oil Recovery (EOR) application. MoO₃ material was used as a base of MQDs. MQDs was synthesized via exfoliation of MoS₂ nanoparticles by Butyl lithium under N₂ atmosphere condition. N-GQDs were synthesized by citric acid and urea materials via hydrothermal method. GQDs/MQDs were prepared via a simple sol-gel method for 5 h string. Synthetic materials were characterized with X-ray diffraction (XRD), Fourier transform infrared (FT-IR), UV–visible absorption, Scanning Microscopic Electron (SEM), EDX profile and mapping, Transmission electron microscopy (TEM), High Resolution Transmission electron microscopy (HRTEM) and differential scanning calorimetry (DSC). Then, emulsions were prepared with two different cationic and anionic surfactants and the stability and morphology of emulsion droplets were investigated in condition close to reservoir environment. Our results show that 10% GQDs/MQDs in cationic surfactant and 50% GQDs/MQDs in anionic surfactant have good stability and very small and fine emulsion droplets in simulated reservoir conditions in laboratory. The Interfacial Tension (IFT) measurement shows >70% improvement which indicates the high ability of these nanohybrids in reducing the surface tension than previous nanohybrids. Contact angle values show that these nanohybrids can alter the wettability of reservoir rock from oil-wet to water-wet so the trapped oil in the porous region of rock can be easily extracted in the presence of a layer of these nanohybrids. Furthermore, according to the results of altering the density and viscosity of nanohybrids, these are not as limiting parameters and only about 1% increasing observed for density and viscosity, respectively. Coreflooding test revealed the high oil recovery efficiency (22%) at very low nanofluid concentration (0.01 wt%).

纳米颗粒稳定的乳状液比常规乳状液更具吸引力和实用性，该乳液具有通过胶体颗粒和不同的表面活性剂稳定的常规乳状液，因为它们具有优势和特殊特性，例如在恶劣条件下具有很高的稳定性，可在储层中长距离移动，并且由于体积小而不会造成高保留纳米粒子。通常只生产原始石油的三分之一（OIP），而将三分之二的石油捕获在储层岩石中，因此应使用合适的化学强化采油（C-EOR）方法。在这项研究中，我们建议了一种新颖，经济和商业的方法来合成N掺杂石墨烯量子点（N-GQDs）/ MoS ₂量子点（MQDs）纳米杂化物，用于制备不同百分比的纳米乳剂，可显着降低界面张力，因此可用于增强采油（EOR）应用。MoO ₃材料用作MQD的基础。在N ₂下，丁基锂通过MoS ₂纳米颗粒的剥离来合成MQD。大气条件。N-GQDs是由柠檬酸和尿素经水热法合成的。GQD / MQD通过简单的溶胶-凝胶法制备5小时。通过X射线衍射（XRD），傅立叶变换红外（FT-IR），紫外可见吸收，扫描显微电子（SEM），EDX轮廓和绘图，透射电子显微镜（TEM），高分辨率透射电子对合成材料进行了表征显微镜（HRTEM）和差示扫描量热法（DSC）。然后，用两种不同的阳离子和阴离子表面活性剂制备乳液，并在接近储层环境的条件下研究乳液液滴的稳定性和形态。我们的结果表明，在实验室模拟储层条件下，阳离子表面活性剂中10％的GQDs / MQDs和阴离子表面活性剂中的50％GQDs / MQDs具有良好的稳定性，并且乳液液滴非常细小。界面张力（IFT）测量显示> 70％的改善，这表明这些纳米杂化物比以前的纳米杂化物具有降低表面张力的高能力。接触角值表明，这些纳米混杂物可将储层岩石的润湿性从油润湿变为水润湿，因此，在存在这些纳米混杂物层的情况下，可以轻松地提取岩石多孔区域中捕获的油。此外，根据改变纳米杂化物的密度和粘度的结果，这些并不是限制性的参数，并且分别仅观察到密度和粘度仅增加约1％。