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With the increasing demand for enhancing production of oil and gas all over the world, improving oil recovery technologies aiming at developing low permeable and tight oil reservoirs are becoming the focus of current research. To help understanding the mechanism of multiphase displacement in underground reservoir, the microcosmic characterization of porous media must be explored. In recent years, Digital rock physics (DRP) technology for simulative analysis of rock physical properties based on extracted CT scanning images plays more and more important roles in geosciences, soil science, petroleum engineering and many other fields.
In this paper, A novel procedure is proposed for accurate reconstruction the 3-D pore internal structures, based on which the pore volume is successfully meshed for further detailed numerical investigations of the multiphase displacement process in porous media. The first step is to determine the REV of the studied rock after processing the all the CT images with the software of ImageJ®, with which the image noise reduction , threshold segmentation and binarize processes are carried out. The second step is to employ Matlab® software to transform the binary black and white series of rock images into a digital 3-D matrix consists of 0 and 1. Then reconstruction of the pore void volume is performed through employing the software of ProE®, which could supply the compatible format for the fluid dynamics analysis software of Fluent®.
Single phase and two-phase displacement processes are numerically investigated with the software of Fluent® in the reconstructed pore structures. Numerically obtained gas permeability is 2.02D, which reasonably lies in the region of 1.2~3D of the Bentheimer core samples. It is concluded the proposed novel rock internal structure reconstruction procedure can ensure the simplicity and accuracy on predicting the multiphase transport characteristics in porous media.
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