Abstract
Classical stability theory predicts the critical velocity for a miscible fluid to be stabilized by gravity forces. This theory was tested for surfactant floods with ultra-low interfacial tension and found to be optimistic compared to both laboratory displacement experiments and fine-grid simulations. The inaccurate prediction of instabilities based on available analytical models is due to the complex physics of surfactant floods. First we simulated vertical sandpack experiments to validate the numerical model. Then we performed systematic numerical simulations in two and three dimensions to predict formation of instabilities in surfactant floods and to determine the velocity required to prevent instabilities by taking advantage of buoyancy. The 3D numerical grid was refined until the numerical results converged. A third-order TVD finite-difference method was used for these simulations. We investigated the effects of dispersion, heterogeneity, oil viscosity, relative permeability, microemulsion viscosity. These results indicate that it is possible to design a very efficient surfactant flood without any mobility control if the surfactant solution is injected at a low velocity in horizontal wells at the bottom of the geological zone and the oil captured in horizontal wells at the top of the zone. This approach is practical only if the vertical permeability of the geological zone is high. These experiments and simulations have provided new insight into how a gravity stable low-tension displacement behaves and in particular the importance of the microemulsion phase and its properties, especially its viscosity. Numerical simulations show high oil recovery efficiencies on the order of 60% of water flood residual oil saturation for gravity stable surfactant floods using horizontal wells. Thus under favorable reservoir conditions, gravity stable surfactant floods are very attractive alternatives to surfactant-polymer floods. Some of the world’s largest oil reservoirs are deep, high-temperature, high-permeability, light-oil reservoirs and thus candidates for gravity stable surfactant floods.