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| Full Citation |
| Material Information |
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Title: |
P3.49 - Study of gas-water two-phase flow in coal matrix Experimental Methods for Multiphase Flows |
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Series Title: |
7th International Conference on Multiphase Flow - ICMF 2010 Proceedings |
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Physical Description: |
Conference Papers |
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Creator: |
Xu, B.
Li, X.
Zhao, M.
Xu, Z.
Hu, A.-M.
Chen, D.
Zhang, D. |
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Publisher: |
International Conference on Multiphase Flow (ICMF) |
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Publication Date: |
June 4, 2010 |
| Subjects |
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Subject: |
coal matrix
transport mechanism
dissolved gas
gas bubbles
free gas
two-phase flow |
| Notes |
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Abstract: |
Gas transport through the porous coal matrix is generally assumed to be dominated by gas phase diffusion, which is driven by concentration gradients. However, the matrix pore volume contains some amount of water, which occupies gas phase diffusion channels. Gas phase diffusion theory does not reflect the influence of matrix pore water on diffusion.
This paper studies the phase behavior of fluid and flow mechanisms in coal matrix pores. After desorbing from the coal internal surface, some gas dissolves in water, then diffuses and flows in the form of dissolved gas. Another section forms gas bubbles on the absorption surface, then the bubbles are transported into cleats under the action of pressure gradients, buoyance, etc. Gas is transported through the matrix in the form of dissolved gas and free gas. The diffusion of dissolved gas, which occurs in water, may play a role in gas production. Whereas free gas flow is a process of nonlinear seepage. This paper reveals the gas transport mechanisms through the coal matrix. It is concluded that the two-phase flow of water and gas exists in coal matrix pores. Coals possess dual-porosity and dual-permeability characteristics similar to carbonate rocks. This opinion is different from traditional view. It provides a theoretical basis for well productivity prediction, well testing, dynamic reserve calculation. |
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General Note: |
The International Conference on Multiphase Flow (ICMF) first was held in Tsukuba, Japan in 1991 and the second ICMF took place in Kyoto, Japan in 1995. During this conference, it was decided to establish an International Governing Board which oversees the major aspects of the conference and makes decisions about future conference locations. Due to the great importance of the field, it was furthermore decided to hold the conference every three years successively in Asia including Australia, Europe including Africa, Russia and the Near East and America. Hence, ICMF 1998 was held in Lyon, France, ICMF 2001 in New Orleans, USA, ICMF 2004 in Yokohama, Japan, and ICMF 2007 in Leipzig, Germany. ICMF-2010 is devoted to all aspects of Multiphase Flow. Researchers from all over the world gathered in order to introduce their recent advances in the field and thereby promote the exchange of new ideas, results and techniques. The conference is a key event in Multiphase Flow and supports the advancement of science in this very important field. The major research topics relevant for the conference are as follows: Bio-Fluid Dynamics; Boiling; Bubbly Flows; Cavitation; Colloidal and Suspension Dynamics; Collision, Agglomeration and Breakup; Computational Techniques for Multiphase Flows; Droplet Flows; Environmental and Geophysical Flows; Experimental Methods for Multiphase Flows; Fluidized and Circulating Fluidized Beds; Fluid Structure Interactions; Granular Media; Industrial Applications; Instabilities; Interfacial Flows; Micro and Nano-Scale Multiphase Flows; Microgravity in Two-Phase Flow; Multiphase Flows with Heat and Mass Transfer; Non-Newtonian Multiphase Flows; Particle-Laden Flows; Particle, Bubble and Drop Dynamics; Reactive Multiphase Flows |
| Record Information |
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Bibliographic ID: |
UF00102023 |
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Volume ID: |
VID00534 |
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Source Institution: |
University of Florida |
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Holding Location: |
University of Florida |
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Rights Management: |
All rights reserved by the source institution and holding location. |
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Resource Identifier: |
P349-Xu-ICMF2010.pdf |
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