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The degree of steam overlay and descriptions of the migration rules for vapor front are considered one of the greatest challenges to research the seepage laws of steam assisted gravity drainage. In order to surmount these challenges, the theory of percolation mechanics are introduced, combined with the well group structure of steam assisted gravity drainage, we do workings such as establishing the mathematical model of pressure field, applying the steam overlap theory and simplifying the steam overlap coefficient, adopting the technology of database and mapping to display the trends of vapor front intuitively. At last, combined with production factor and reservoir thickness, we analyze the sweep volume of steam and the influence rules of the vapor front migration. Understanding the achievements will provide scientific basis to the improvement of steam’s sweep volume in symmetry elements, displaying the working degree of reservoirs intuitively as well as the efficient development of steam assisted

The Research of Vapor Phase Front Migration Rules in Steam Assisted Gravity Drainage