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Simulation of Gas Production from Multilayered Hydrate-Bearing Media with Fully Coupled Flow, Thermal, Chemical and Geomechanical Processes Using TOUGH+Millstone. Part 3: Production Simulation Results

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Abstract

The TOUGH+Millstone simulator has been developed for the analysis of coupled flow, thermal and geomechanical processes associated with the formation and/or dissociation of \(\hbox {CH}_{4}\)-hydrates in geological media. It is composed of two constituent codes: (a) a significantly enhanced version of the TOUGH+Hydrate simulator, v2.0, that accounts for all known flow, physical, thermodynamic and chemical processes associated with the evolution of hydrate-bearing systems and includes the most recent physical properties relationships, coupled seamlessly with (b) Millstone v1.0, a new code that addresses the conceptual, computational and mathematical shortcomings of earlier codes used to describe the geomechanical response of these systems. The capabilities of the TOUGH+Millstone code are demonstrated in the simulation and analysis of the system flow, thermal, and geomechanical behavior during gas production from a realistic complex offshore hydrate deposit. In the third paper of this series, we apply the simulators described in parts 1 and 2 to a problem of gas production from a complex, multilayered system of hydrate-bearing sediments in an oceanic environment. We perform flow simulations of constant-pressure production via a vertical well and compare those results to a coupled flow-geomechanical simulation of the same process. The results demonstrate the importance of fully coupled geomechanics when modeling the evolution of reservoir properties during production.

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Acknowledgements

This work was supported by the Assistant Secretary for Fossil Energy, Office of Natural Gas and Petroleum Technology, through the National Energy Technology Laboratory, under the U.S. Department of Energy, Contract No. DE-AC03-76SF00098, and also through a funded collaboration with Chevron.

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Authors and Affiliations

  1. Energy Geosciences Division, Lawrence Berkeley National Laboratory, California, USA

    Matthew T. Reagan, Alejandro F. Queiruga & George J. Moridis

  2. Petroleum Engineering Department, Texas A&M University, College Station, USA

    George J. Moridis

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  1. Matthew T. Reagan
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  2. Alejandro F. Queiruga
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  3. George J. Moridis
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Correspondence to Matthew T. Reagan.

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Reagan, M.T., Queiruga, A.F. & Moridis, G.J. Simulation of Gas Production from Multilayered Hydrate-Bearing Media with Fully Coupled Flow, Thermal, Chemical and Geomechanical Processes Using TOUGH+Millstone. Part 3: Production Simulation Results. Transp Porous Med 129, 179–202 (2019). https://doi.org/10.1007/s11242-019-01283-1

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  • DOI: https://doi.org/10.1007/s11242-019-01283-1

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