Visualization of ASP Coreflood Experiments Using X-ray CT Imaging

摘要: Description: This paper describes a series of experiments that used X-ray tomography to visualize the mobilization remaining oil by Alkaline Surfactant Polymer (ASP) flooding after conventional waterflooding. The were conducted in cores drilled from Bentheim sandstone outcrop material with diameters approximately 7.55 cm and lengths 14.9, 27.5 100 cm. crude has an in-situ viscosity about cP contains petroleum acids are converted soaps presence alkali. Application: In addition pressure effluent data collected during coreflood phase saturation distributions space time needed more completely interpret results core floods. additional information reveals underlying mechanisms, assists development models capture physics ASP can ultimately be provide field scale predictions for performance. Results, Observations, Conclusions: • A significant bank was created, propagated, produced each experiments. size terms length maximum is largely dependent on post-waterflood distribution along cores. Large variations both absolute value spatial observed different characteristic self-similar cross-sectional averaged profile develops floods longer Detailed analyses individual frames revealed separate “oil” “ASP fingers” area downstream bank. Significance: displacement mechanisms involved relatively viscous crudes CT visualization. resulting improved understanding process increases confidence potential full-field application flooding.