نوع مقاله : مقاله پژوهشی
نویسندگان
گروه مهندسی نفت، پردیس بین المللی کیش، دانشگاه تهران، کیش، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
Damage in the vicinity of the wellbore has become one of the significant obstacles in the path of oil well production. Formation damage has various roots, and efforts to mitigate it largely depend on a precise understanding of its origin
In this study, considering the importance of this issue, a framework based on laboratory experiments at the molecular-structural scale was developed. For this purpose, processed reservoir rock samples from the southern regions of Iran were prepared. Using real crude oil samples, the reservoir environment and oil-rock contact were simulated in the laboratory environment using a core flooding apparatus. Then, the drilling fluid sample was prepared based on a specific formulation, and its filtrate was separated using a filter press apparatus under optimal conditions. The conducted investigation on clean core, oil-contaminated core, and core impregnated with filtrate showed that the drilling fluid filtrate in the present formulation caused a change in the rock surface wettability from oil-wet to water-wet. This significant alteration notably reduces the capillary forces acting on the hydrocarbon fluid and reduces the relative permeability of the oil phase, leading to a decrease in oil production from the reservoirs.
In this regard, by conducting detailed studies and identifying the influential factor group in wettability alteration, the presence of a new additive was identified, and a new drilling fluid formulation based on this new additive was designed and manufactured. Further studies on this drilling fluid sample showed that the wettability alteration due to the injection of the drilling fluid filtrate significantly improved, leading to a substantial reduction in the reservoir
کلیدواژهها [English]
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