A Study for Recovery Factor of Heavy Oil Reservoir in Steam Soak's Period

According to geologic feature of heavy Oil reservoir and case of developing, the relation between recovery factor with permeability, Viscosity, net thickness/general thickness and net thickness of single layer in heavy Oil- reservoir was studed. Through using the method of evaluation of fuction value in Value Engincering again, so acheved formulas of calculating recovery factor. In initial stage of Oil field or no performance data the formula can be used