| Starting with the characteristics of the pore structure, by the testing means mostly, based on the plentiful experiment data, this paper study on the influencing factors of the permeability of the low permeability reservoir, the threshold pressure gradient of one phases percolation, the threshold pressure gradient of two phases of oil and water percolation, and the influencing factors of the driving oil efficiency of the low permeability reservoir. This paper analyze 6892 parameters of 807 pieces of sample from 342 wells, and test 116 pieces of sample. Through the studying, this paper get some conclusion in the following text.One. The permeability of low permeability sandstone reservoir is controlled by the core radius mean, and bears power function relation to core radius mean, increasing with the core radius mean increasing.Two. Permeability of low permeability sandstone reservoir bears power function to overburden pressure, and decreasing with the increase of the overburden pressure.Three. The threshold pressure gradient of one phases decrease with the permeability increasing, and increase with the viscosity of liquid increasing, and increase with the displacement pressure gradient increasing. And according to the experiment results, this paper get some useful experience formula as well as applied plots.Four. The threshold pressure gradient of two phases of oil and water bears power function relation to air permeability and water saturation, and decreasing with the increase of the water saturation and air permeability gradually. And this paper build the relationship formula between threshold pressure gradient and air permeability, water saturation.Five. The water driving oil efficiency bears power function relation to the viscosity ratio of oil and water the characteristic structure coefficient, and decreasing with the increase of the viscosity ratio of oil and water, increasing with the characteristic structure coefficient increasing.
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