Influence of porosity on water-air two phase displacement law in porous media model
The porosity of porous media is an important factor affecting the water-air two-phase displacement mode and injection saturation,with the later being the key index to determine the leaching rate of ion-type rare earth ore.By conducting microfluidic model experiments on water-air two-phase displacement in porous media with four different porosities,the water-air two-phase displacement mode was determined,the formation mechanism and distribution characteristics of air clusters were analyzed,and the influence of porosity on the injection saturation in the model was studied.The results indicate that the water-air two-phase displacement under the experimental conditions is in the capillary fingering displacement mode,and the fingering phenomenon is more significant in the case of high porosity.With the increase of capillary number,the seepage pattern tends to be stable.The air clusters are easily formed in the pores of porous media in the capillary fingering process,where the air clusters in the low porosity model are small and numerous while those in the high porosity model are large and small.The injection saturation in the model decreases with increasing porosity and increases with increasing injection intensity.
water-air two-phase flowporous mediaporositycapillary fingeringdegree of saturation
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