نوع مقاله : مقاله پژوهشی
نویسندگان
1 02166164579
2 دانشکده مهندسی شیمی و نفت/تهران/ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
In fractured reservoirs under the gravity drainage, the oil transfer between adjacent matrix blocks is one of the main factors in determining the degree of oil recovery. Communication between matrix blocks can occur by forming a liquid bridge between two adjacent matrices. Therefore, in this study, by modeling and simulating the matrix and the fracture in Comsol, we investigated the characteristics of the liquid bridge formed inside the fracture and the dependency of the liquid bridge shape and the capillary pressure on the fracture properties such as the fracture aperture, matrix permeability and wettability. The initial and boundary conditions in the problem are set such that it show the flow exchange between the matrix and fracture in reservoir conditions. The results of this simulation showed that the liquid bridge throat decreases with the size of the fracture aperture. This change in the liquid bridge causes the capillary pressure to decrease uniformly with the increase of the fracture aperture, and after a critical value (for example, 1.7 mm), the fracture capillary pressure becomes negative. Also, the results showed that the larger the contact angle (toward neutral wettability), the more vertically liquid bridge formed and it leads to small changes ( 40 psi ) in the fracture capillary pressure. In addition, with the increase of rock permeability and more flow entering the fracture, the throat of the formed liquid bridge increased from about 0.03 mm to about 0.05 mm, which is consistent with the published laboratory data. The findings of this research can be used for better understanding how the liquid bridge changes and its effect on the calculation of the fracture capillary pressure, which is a necessary parameter in carrying out the reservoir scale simulations
کلیدواژهها [English]
)