جستجوی مقالات مرتبط با کلیدواژه "anisotropic permeability" در نشریات گروه "مهندسی شیمی، نفت و پلیمر"

CO2 injection in saline aquifers is a crucial method for carbon sequestration, reducing atmospheric CO2 levels and mitigating climate change. Saline aquifers, due to their large capacity and widespread availability, serve as effective storage sites for CO2, helping to isolate it long-term and prevent its release back into the atmosphere. This study investigates the uplift of the top surface of a deep saline aquifer due to CO2 injection, using the finite element numerical approach. The density and viscosity of the injected supercritical CO2 were considered as functions of temperature and pressure, while the density and viscosity of saline water were similarly modeled as temperature- and pressure-dependent. Geothermal temperature variations were also incorporated into the model. Additionally, the effects of halting injection after a certain period and the subsequent spread of injected CO2 in the aquifer, driven by capillary and gravitational forces, were examined in relation to the displacements. Both horizontal and vertical well configurations were studied. The modeling results indicated that with a vertical well, the CO2 plume extended to higher levels and farther distances from the injection point compared to a horizontal well, resulting in greater surface uplift with the horizontal well configuration. The impact of permeability anisotropy was also analyzed, revealing that when horizontal permeability is ten times greater than vertical permeability, the CO2 plume spreads horizontally, substantially reducing the aquifer surface uplift.

The study of flow through porous media has been of cardinal gravity in various oil and gas applications like enhanced oil recovery (EOR), acidizing, fracturing, etc. In apprehension to this need, core modeling has become prevalent to understand the flow through porous media. Hence, our study is aimed at simulating and analyzing the effect of surfactant flooding through anisotropic permeability conditions in a subsurface environment. The simulations were carried out on a 2-D model of the experimental core and were finely meshed for the better convergence. The natural anionic surfactant extracted from Madhuca longifolia oil and Partially Hydrolyzed Polyacryl Amide polymer referenced for the physicochemical properties were used in the simulations. Several sets of directional permeabilities were introduced vertically and horizontally for a single absolute permeability and porosity system. Results indicated to a trend of oil recovery upright with increasing vertical permeability. A lower areal sweep efficiency and early breakthrough were observed in models with high horizontal permeabilities. With the ingress of computational fluid dynamics in the oil and gas industry, a more comprehensive understanding of flow patterns allows improved EOR process designs. Our research exploited this to model the multiphase flow through an anisotropic permeability medium and its effect on the oil recovery.