A Modified Method and Experimental Verification for Estimating Relative Permeability from Resistivity Logging Data

摘要

The existing method to infer relative permeability from resistivity data was modified by including more parameters such as residual oil saturation.Both oil-water relative permeability and resistivity were measured simultaneously in the same core sample at a room temperature in order to verify the modified model.Altogether 16 core samples in 2 wells from Daqing oil field,China have been tested.The permeability ranged from about 10 to 800 md.The oil-water relative permeability data were measured using a dynamic displacement technique.Oil-water relative permeability data were inferred from the resistivity data measured in the laboratory and logged from the well using the modified model.The model data were then compared to the experimental data.We demonstrated that the relative permeability of both oil and water calculated from the resistivity data measured in the same core samples and logged from the same wells were close to the experimental data measured using a dynamic displacement approach.The modified model had a greater accuracy compared with the existing models.Using the modified model,it would be possible to obtain the different distribution of relative permeability characteristics in different kinds of formations in a reservoir.It may also be feasible to infer relative permeability data while drilling if resistivity well logging is being taken.