Physical mechanisms for multiphase flow associated with hydrate formation
Abstract
Many Arctic hydrate reservoirs such as those of the Prudhoe Bay and Kuparuk River area on the Alaska North Slope (ANS) are believed originally to be natural gas accumulations converted to hydrate accumulations after being placed in the gas hydrate stability zone (GHSZ) in response to ancient climate cooling. In this paper, the implications of a previously described mechanistic model for the transport of gaseous and aqueous phases are studied using a transient 1-D transport model during the conversion of a gas reservoir to a hydrate reservoir. The mechanistic model predicts/explains the vertical profile of hydrate saturation in “converted free gas” hydrate reservoirs. The initial gas phase saturation with depth is estimated from the profile of capillary entry pressure, which is estimated from grain size distributions measured in cores. The gas accumulation is assumed to be disconnected from its original source so that methane transport occurs only within it. As the base of the GHSZ descends through the sediment, hydrate forms within the GHSZ. The net volume reduction associated with hydrate formation creates a “sink” which drives flow of gaseous and aqueous phases to the hydrate formation zone. Mechanisms by which this fluid movement could have occurred are analyzed. Flowmore »
- Authors:
-
- Marathon Oil Company, Houston, TX (United States)
- Univ. of Calgary, AB (Canada). Chemical and Petroleum Engineering Dept.
- Publication Date:
- Research Org.:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Org.:
- USDOE Office of Fossil Energy (FE)
- OSTI Identifier:
- 1466286
- Alternate Identifier(s):
- OSTI ID: 1373810
- Grant/Contract Number:
- FC26-06NT43067
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 5; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; gas hydrate; capillary; Mount Elbert; gas hydrate stability zone (GHSZ); hydration number
Citation Formats
Behseresht, Javad, and Bryant, Steven L. Physical mechanisms for multiphase flow associated with hydrate formation. United States: N. p., 2017.
Web. doi:10.1002/2016JB013503.
Behseresht, Javad, & Bryant, Steven L. Physical mechanisms for multiphase flow associated with hydrate formation. United States. https://doi.org/10.1002/2016JB013503
Behseresht, Javad, and Bryant, Steven L. 2017.
"Physical mechanisms for multiphase flow associated with hydrate formation". United States. https://doi.org/10.1002/2016JB013503. https://www.osti.gov/servlets/purl/1466286.
@article{osti_1466286,
title = {Physical mechanisms for multiphase flow associated with hydrate formation},
author = {Behseresht, Javad and Bryant, Steven L.},
abstractNote = {Many Arctic hydrate reservoirs such as those of the Prudhoe Bay and Kuparuk River area on the Alaska North Slope (ANS) are believed originally to be natural gas accumulations converted to hydrate accumulations after being placed in the gas hydrate stability zone (GHSZ) in response to ancient climate cooling. In this paper, the implications of a previously described mechanistic model for the transport of gaseous and aqueous phases are studied using a transient 1-D transport model during the conversion of a gas reservoir to a hydrate reservoir. The mechanistic model predicts/explains the vertical profile of hydrate saturation in “converted free gas” hydrate reservoirs. The initial gas phase saturation with depth is estimated from the profile of capillary entry pressure, which is estimated from grain size distributions measured in cores. The gas accumulation is assumed to be disconnected from its original source so that methane transport occurs only within it. As the base of the GHSZ descends through the sediment, hydrate forms within the GHSZ. The net volume reduction associated with hydrate formation creates a “sink” which drives flow of gaseous and aqueous phases to the hydrate formation zone. Mechanisms by which this fluid movement could have occurred are analyzed. Flow driven by saturation gradients plays a key role in creating reservoirs of large hydrate saturations, as observed in Mount Elbert stratigraphic test well in the Milne Point Unit of Alaska North Slope (ANS). Viscous-dominated pressure-driven flow of gaseous and aqueous phases cannot explain large hydrate saturations originated from large-saturation gas accumulations. The mode of hydrate formation for a wide range of rate of hydrate formation, the rate of descent of the base of GHSZ, and host sediment characteristics are analyzed and characterized based on dimensionless groups. The proposed transport model is also consistent with field data from hydrate-bearing sand units in Mount Elbert well. Finally, results show that not only the petrophysical properties of the host sediment but also the rate of hydrate formation and the rate of temperature cooling at the surface contribute greatly to the final hydrate saturation profiles.},
doi = {10.1002/2016JB013503},
url = {https://www.osti.gov/biblio/1466286},
journal = {Journal of Geophysical Research. Solid Earth},
issn = {2169-9313},
number = 5,
volume = 122,
place = {United States},
year = {Mon Apr 24 00:00:00 EDT 2017},
month = {Mon Apr 24 00:00:00 EDT 2017}
}
Web of Science
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