عنوان	Colloidal stability and rheological behavior of a hydrophilic nanofluid for wettability modification, interfacial tension reduction, and improving sweep efficiency at the pore scale of carbonate Colloidal stability and rheological behavior of a hydrophilic nanofluid for wettability modification, interfacial tension reduction, and improving sweep efficiency at the pore scale of carbonate formations
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Carbon nanotubes, Chitosan, Asphaltene inhibition, Interfacial phenomena, Pore-scale displacement
چکیده	This study introduces a novel hydrophilic nanofluid composed of multi-walled carbon nanotubes, chitosan biopolymer, and a zwitterionic surfactant (cocamidopropyl betaine) to address Enhanced Oil Recovery (EOR) challenges in carbonate reservoirs, including oil-wetness, high interfacial tension, and asphaltene instability. The optimized formulation at 200 ppm demonstrated excellent colloidal stability at 80 °C for 15 days (zeta potential: −58.74 mV) and enhanced viscosity relative to the pristine polymer solution. Wettability was drastically altered from an oil-wet state (136°) to a strongly water-wet condition (19.11°), while interfacial tension was reduced by 94% to an ultra-low value of 1.06 mN/m. Core flooding experiments yielded an incremental oil recovery of 35.84%. Asphaltene dispersant tests confirmed 93.43% efficiency at the optimal dosage. This work offers a scalable and environmentally conscious nanofluidic strategy for enhancing production from challenging asphaltenic carbonate formations.
پژوهشگران	جاسم محمد (نفر اول)، نعیمه ستاره شناس (نفر دوم)، احسان جعفربیگی (نفر سوم)، محسن منصوری (نفر چهارم)، مرجان تنظیفی (نفر پنجم)