An investigation on surfactant aided gravity drainage in fractured reservoirs using matrix block flow simulation

摘要: Abstract Capillary and gravity forces are the controlling mechanisms in fractured reservoirs recovery. Most of carbonate formations with mixed wet oil rocks. One techniques to improve recovery from these is surfactant treatment water invaded zone formation known as surfactant-aided drainage. A number experimental modeling studies available this research area however, a approach validated data consider different conditions reservoir, including rock physics, fluid properties, salinity functionalities still necessary element before pilot tests for technique. In work, proposed provide insight into engineering aspects process. It defines reservoir matrix (core scale) surrounded by surfactant-brine solution fracture that acts boundary an imbibition test scenario. The wet, therefore at first, diffusive drive leading wettability alteration. Afterwards counter-current takes place early through middle time experiment. Finally, drainage controls parametric analysis investigates effects various parameters. Different modifications base case (validated data) performed each parameter then resultant curves compared study shows densities, height, anisotropy ratio, permeability, connate saturation, capillary pressure saturation end-points, main parameters influencing performance This highlights process sensitivity changes effective displacement