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Title: Numerical Analysis of Experiments on Thermally Induced Dissociation of Methane Hydrates in Porous Media

Abstract

Numerical simulation is essential for the prediction and evaluation of hydrocarbon reservoir performance. Numerical simulators developed for the description of the behavior of hydrates under production and the corresponding flow of fluids and heat accounting for all known processes are powerful, but they need validation through comparison to field or experimental data in order to instill confidence in their predictions. In this study, we analyze by means of numerical simulation the results of an experiment of methane hydrate dissociation by thermal stimulation in unconsolidated porous media heated through the vessel walls. The physics captured by the model include multicomponent heat and mass transfer, multiphase flow through porous media, and the phase behavior of the CH 4 + H 2O system involved in methane hydrate formation and dissociation. The set of governing equations consists of the mass and energy conservation equations coupled with constitutive relationships, i.e., the dissolution of gas in H 2O, relative permeability and capillary pressure models, composite thermal conductivity models, and methane hydrate phase equilibria. The model geometry describes accurately the hydrate reactor used in a recent experimental study investigating methane hydrate dissociation behavior [Chong et. al. Appl. Energy 2016, 177, 409-421]. The cumulative gas production is estimatedmore » and validated against three tests of experimental data involving different boundary temperatures, showing a good agreement between observations and numerical predictions. The predicted evolution of the spatial distributions of different phases over time shows that hydrate dissociation progresses inward from the reactor boundary to the center, methane gas accumulates to the top of the reactor because of buoyancy, and water migrates down to the bottom of the reactor because of gravity. A sharp hydrate dissociation front is predicted, and the estimated location of hydrate dissociation front suggests a linear relationship with the square root of time. A sensitivity analysis on the thermal conductivity of sand under fully saturated conditions is conducted to elucidate its effect on the gas production behavior. In addition, the energy efficiency ratio computed from the simulation of this boundary-wall heating technique varies from 14.0 to 16.2. Deviations between observations and predictions of the evolution of the temperature profile are attributed to initial heterogeneous distribution of the hydrate phase in the hydrate reactor.« less

Authors:
 [1];  [2];  [3];  [4]; ORCiD logo [3]
  1. National Univ. of Singapore (Singapore); Lloyd’s Register Global Technology Centre Pte Ltd (Singapore)
  2. National Univ. of Singapore (Singapore); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Texas A & M Univ., College Station, TX (United States); Lloyd’s Register Global Technology Centre Pte Ltd (Singapore)
  3. National Univ. of Singapore (Singapore)
  4. Lloyd’s Register Global Technology Centre Pte Ltd (Singapore)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1479404
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 57; Journal Issue: 17; Journal ID: ISSN 0888-5885
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Yin, Zhenyuan, Moridis, George, Chong, Zheng Rong, Tan, Hoon Kiang, and Linga, Praveen. Numerical Analysis of Experiments on Thermally Induced Dissociation of Methane Hydrates in Porous Media. United States: N. p., 2017. Web. doi:10.1021/acs.iecr.7b03256.
Yin, Zhenyuan, Moridis, George, Chong, Zheng Rong, Tan, Hoon Kiang, & Linga, Praveen. Numerical Analysis of Experiments on Thermally Induced Dissociation of Methane Hydrates in Porous Media. United States. doi:10.1021/acs.iecr.7b03256.
Yin, Zhenyuan, Moridis, George, Chong, Zheng Rong, Tan, Hoon Kiang, and Linga, Praveen. Fri . "Numerical Analysis of Experiments on Thermally Induced Dissociation of Methane Hydrates in Porous Media". United States. doi:10.1021/acs.iecr.7b03256. https://www.osti.gov/servlets/purl/1479404.
@article{osti_1479404,
title = {Numerical Analysis of Experiments on Thermally Induced Dissociation of Methane Hydrates in Porous Media},
author = {Yin, Zhenyuan and Moridis, George and Chong, Zheng Rong and Tan, Hoon Kiang and Linga, Praveen},
abstractNote = {Numerical simulation is essential for the prediction and evaluation of hydrocarbon reservoir performance. Numerical simulators developed for the description of the behavior of hydrates under production and the corresponding flow of fluids and heat accounting for all known processes are powerful, but they need validation through comparison to field or experimental data in order to instill confidence in their predictions. In this study, we analyze by means of numerical simulation the results of an experiment of methane hydrate dissociation by thermal stimulation in unconsolidated porous media heated through the vessel walls. The physics captured by the model include multicomponent heat and mass transfer, multiphase flow through porous media, and the phase behavior of the CH4 + H2O system involved in methane hydrate formation and dissociation. The set of governing equations consists of the mass and energy conservation equations coupled with constitutive relationships, i.e., the dissolution of gas in H2O, relative permeability and capillary pressure models, composite thermal conductivity models, and methane hydrate phase equilibria. The model geometry describes accurately the hydrate reactor used in a recent experimental study investigating methane hydrate dissociation behavior [Chong et. al. Appl. Energy 2016, 177, 409-421]. The cumulative gas production is estimated and validated against three tests of experimental data involving different boundary temperatures, showing a good agreement between observations and numerical predictions. The predicted evolution of the spatial distributions of different phases over time shows that hydrate dissociation progresses inward from the reactor boundary to the center, methane gas accumulates to the top of the reactor because of buoyancy, and water migrates down to the bottom of the reactor because of gravity. A sharp hydrate dissociation front is predicted, and the estimated location of hydrate dissociation front suggests a linear relationship with the square root of time. A sensitivity analysis on the thermal conductivity of sand under fully saturated conditions is conducted to elucidate its effect on the gas production behavior. In addition, the energy efficiency ratio computed from the simulation of this boundary-wall heating technique varies from 14.0 to 16.2. Deviations between observations and predictions of the evolution of the temperature profile are attributed to initial heterogeneous distribution of the hydrate phase in the hydrate reactor.},
doi = {10.1021/acs.iecr.7b03256},
journal = {Industrial and Engineering Chemistry Research},
issn = {0888-5885},
number = 17,
volume = 57,
place = {United States},
year = {2017},
month = {11}
}

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Cited by: 12 works
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