Analytical Modeling of Gas Diffusivity Into Oil Through a Film of Water

Abstract

The authors aimed to determine diffusion coefficient of gas in oil when there is a water-blocking film between them. Dealing with this purpose, a new technique based on analytical modeling was developed to measure the diffusivity and solubility of gas into oil and water. The system that was described is solved analytically and numerically. The result of analytical solution is presented as different type curves, which are very simple to use. To generate data, a numerical scheme was employed. The determination of gas diffusivity and solubility emerged from matching concentration data with the type curves.