The water retention curve and relative permeability for gas production from hydrate‐bearing sediments: pore‐network model simulation

American Geophysical Union (AGU) - Tập 17 Số 8 - Trang 3099-3110 - 2016
Nariman Mahabadi1, Sheng Dai2, Yongkoo Seol3, Tae Sup Yun4, Jaewon Jang1
1School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, Arizona, USA
2School of Civil and Environmental Engineering Georgia Institute of Technology Atlanta Georgia USA
3National Energy Technology Laboratory Morgantown West Virginia USA
4Department of Civil and Environmental Engineering, Yonsei University, Seoul, Korea

Tóm tắt

AbstractThe water retention curve and relative permeability are critical to predict gas and water production from hydrate‐bearing sediments. However, values for key parameters that characterize gas and water flows during hydrate dissociation have not been identified due to experimental challenges. This study utilizes the combined techniques of micro‐focus X‐ray computed tomography (CT) and pore‐network model simulation to identify proper values for those key parameters, such as gas entry pressure, residual water saturation, and curve fitting values. Hydrates with various saturation and morphology are realized in the pore‐network that was extracted from micron‐resolution CT images of sediments recovered from the hydrate deposit at the Mallik site, and then the processes of gas invasion, hydrate dissociation, gas expansion, and gas and water permeability are simulated. Results show that greater hydrate saturation in sediments lead to higher gas entry pressure, higher residual water saturation, and steeper water retention curve. An increase in hydrate saturation decreases gas permeability but has marginal effects on water permeability in sediments with uniformly distributed hydrate. Hydrate morphology has more significant impacts than hydrate saturation on relative permeability. Sediments with heterogeneously distributed hydrate tend to result in lower residual water saturation and higher gas and water permeability. In this sense, the Brooks‐Corey model that uses two fitting parameters individually for gas and water permeability properly capture the effect of hydrate saturation and morphology on gas and water flows in hydrate‐bearing sediments.

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American Geophysical Union (AGU)

Tập 17 Số 8

3099-3110

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