Impact of hydrate saturation on water permeability in hydrate-bearing sediments
- Arizona State Univ., Tempe, AZ (United States)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- National Energy Technology Lab. (NETL), Morgantown, WV (United States)
- Hanyang Univ. (South Korea)
Permeability of the hydrate-bearing sediments vitally affects the hydrate dissociation process as well as the rate and efficiency of gas production. Reported permeability values are observed to be widely are very scattered owing to the dependence on multiple factors such as experimental conditions and test procedures. It is critical that the permeability is measured accurately to enable prediction of long-term gas production using numerical simulation for an economic development of hydrate-bearing reservoirs. In this study, the tetrahydrofuran (THF) hydrates that exhibit pore habits of the pore-filling pattern are formed in sediments, and the water permeability is quantified as a function of hydrate saturation. The results reveal that a decrease in the permeability for an increase in the hydrate saturation. Based on the measured values that are bounded by Kozeny grain-coating and pore-filling models, the fitting parameters of the empirical permeability models are indicated for use in numerical simulation of long-term hydrate dissociation. Wave velocity measurements reveal pore habits of pore-filling pattern of THF hydrates in the sediments with Sh < 0.5, and a gradual transition to patchy and load-bearing pore-habits when Sh > 0.6. The numerical simulation results obtained using the complementary pore-network model suggest that the THF hydrates in the sediments may form in small clusters with an average patch size of ~4 pores.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE)
- OSTI ID:
- 1532666
- Report Number(s):
- NETL-PUB-21861
- Journal Information:
- Journal of Petroleum Science and Engineering, Vol. 174, Issue C; ISSN 0920-4105
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Quantitative determination of pore‐structure change and permeability estimation under hydrate phase transition by NMR
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journal | November 2019 |
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