Numerical Determination of Anisotropic Permeability for Unconsolidated Hydrate Reservoir: A DEM–CFD Coupling Method
Abstract
:1. Introduction
2. Materials and Methods
3. DEM–CFD Coupling Simulation
3.1. Reservoir Sediment Modeling According to Geological Origins
3.2. Geometric Model of Pore Space
3.3. Pore-Scale Seepage Simulation
4. Case Studies
4.1. Homogeneous Model Consisting of Identically Sized Spherical Particles
4.2. Heterogeneous Model Consisting of Plate-Shaped, Elongated, and Spherical Particles
5. Conclusions
- (1)
- According to the physical process of sedimentation, a reservoir sediments-modeling method is developed based on the DEM framework, which has the ability to restore the anisotropy of physical properties. An interface program is designed to connect the geometric models of DEM and FEM, and pore-scale computational fluid mechanics simulation is conducted to obtain the anisotropic permeability for the hydrate reservoir.
- (2)
- An idealized homogeneous model consisting of identically sized spherical particles are constructed, and the permeability is obtained with DEM–CFD coupling simulation. The analytical, experimental, and numerical results from previous studies exhibit a high level of consistency with this study, which verifies the accuracy and applicability of the proposed method.
- (3)
- With the increase in compaction stress, the permeability anisotropy exhibited a rapid initial increase, followed by a sustained stabilization. The primary cause is the rearrangement of sediment particles. The non-spherical particles are driven to align in a predominantly horizontal orientation, thereby enhancing anisotropy. A piecewise mathematical model is developed to accurately predict the evolution of permeability anisotropy with a turning point of 3 MPa.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Parameter | Value |
---|---|
Density (kg/m3) | 1000 |
Dynamic viscosity (Pa·s) | 0.001 |
L (μm) | 30 |
Pin (Pa) | 1 |
Pout (Pa) | 0 |
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Li, R.; Han, Z.; Zhang, L.; Zhou, J.; Wang, S.; Huang, F. Numerical Determination of Anisotropic Permeability for Unconsolidated Hydrate Reservoir: A DEM–CFD Coupling Method. J. Mar. Sci. Eng. 2024, 12, 1447. https://doi.org/10.3390/jmse12081447
Li R, Han Z, Zhang L, Zhou J, Wang S, Huang F. Numerical Determination of Anisotropic Permeability for Unconsolidated Hydrate Reservoir: A DEM–CFD Coupling Method. Journal of Marine Science and Engineering. 2024; 12(8):1447. https://doi.org/10.3390/jmse12081447
Chicago/Turabian StyleLi, Ruirui, Zhenhua Han, Luqing Zhang, Jian Zhou, Song Wang, and Fuyou Huang. 2024. "Numerical Determination of Anisotropic Permeability for Unconsolidated Hydrate Reservoir: A DEM–CFD Coupling Method" Journal of Marine Science and Engineering 12, no. 8: 1447. https://doi.org/10.3390/jmse12081447