NDLI: Pore-scale simulation of gas-water flow in low permeability gas reservoirs

Content Provider	Springer Nature Link
Author	Cao, Ting kuan Duan, Yong gang Yu, Bo ming Fang, Quan tang Wang, Rong
Copyright Year	2014
Abstract	A novel method was developed to establish a realistic three dimensional (3D) network model representing pore space in low permeability sandstone. Digital core of rock sample was established by the combination of micro-CT scanning and image processing, then 3D pore-throat network model was extracted from the digital core through analyzing pore space topology, calculating pore-throat parameters and simplifying the shapes of pores and throats. The good agreements between predicted and measured porosity and absolute permeability verified the validity of this new network model. Gas-water flow mechanism was studied by using pore-scale simulations, and the influence of pore structure parameters, including coordination number, aspect ratio and shape factor, on gas-water flow, was investigated. The present simulation results show that with the increment of coordination number, gas flow ability in network improves and the effect of invading water on blocking gas flow weakens. The smaller the aspect ratio is, the stronger the anisotropy of the network is, resulting in the increase of seepage resistance. It is found that the shape factor mainly affects the end points in relative permeability curves, and for a highly irregular pore or throat with a small shape factor, the irreducible water saturation (S $_{wi}$) and residual gas saturation (S $_{gr}$) are relatively high.
Starting Page	2793
Ending Page	2800
Page Count	8
File Format	PDF
ISSN	20952899
Journal	Journal of Central South University of Technology
Volume Number	21
Issue Number	7
e-ISSN	22275223
Language	English
Publisher	Central South University
Publisher Date	2014-07-11
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	low permeability sandstone X-ray computed tomography pore-scale modeling pore structure gas-water flow Engineering Metallic Materials
Content Type	Text
Resource Type	Article
Subject	Metals and Alloys Engineering

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