A mechanistic model for permeability in deformable gas hydrate-bearing sediments

Lei，Gang1; Liao，Qinzhuo1; Zhang，Dongxiao2; Patil，Shirish1

2020-11-01

10.1016/j.jngse.2020.103554

Journal of Natural Gas Science and Engineering   影响因子和分区

1875-5100

2212-3865

Accurate characterization of permeability behavior in hydrate-bearing sediments (HBS) is crucial for sustainable gas production. During gas exaction from HBS, permeability is strongly affected by the geomechanical conditions, which change pore structure of HBS. Moreover, hydrate dissociation will also change pore structure and geomechanical behavior of HBS. Therefore, the predictive modeling of permeability behavior in HBS under stress condition poses great challenges. In this work, a new analytical model is derived to study the effect of hydrate saturation on stress-dependent permeability behavior of HBS. The proposed permeability model solves the steady-state Navier-Stokes equations for fluid flow in HBS with hydrates. It considers hydrate saturation, retained water and hydrate-growth pattern, and is adequately validated with the experimental results in existing literatures. The model demonstrates that the permeability in wall coating (WC) hydrates is larger than that in pore filling (PF) hydrates. Pore habits of gas hydrates transfer from WC pore habit to PF pore habit when hydrate saturation increases. This work constitutes a comprehensive investigation of stress-dependent permeability in deformable HBS, which is a key issue for sustainable gas production. It not only provides theoretical foundations for quantifying permeability in HBS, but also can be used to estimate pore-scale parameters and other relevant parameters (e.g., rock lithology) of HBS using inverse modeling.

Geomechanical behavior Hydrate-bearing sediments Hydrate-growth pattern Permeability

SCI ; EI

英语

其他

Deanship of Scientific Research at King Fahd University of Petroleum and Minerals[SB181033]

Energy & Fuels ; Engineering

Energy & Fuels ; Engineering, Chemical

WOS:000581887900041

ELSEVIER SCI LTD

20203609147587

Flow of fluids ; Gas hydrates ; Gases ; Pore structure ; Sediments ; Geomechanics ; Deformation ; Equations of state ; Hydration ; Navier Stokes equations

Geology and Geophysics:481 ; Geology:481.1 ; Soil Mechanics and Foundations:483 ; Natural Gas Deposits:512.2 ; Gas Fuels:522 ; Fluid Flow, General:631.1 ; Calculus:921.2 ; Mechanics:931.1 ; Physical Properties of Gases, Liquids and Solids:931.2

2-s2.0-85090235350

Scopus

1.Department of Petroleum Engineering,CPG,King Fahd University of Petroleum and Minerals,Dhahran,Saudi Arabia
2.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,China

Lei，Gang,Liao，Qinzhuo,Zhang，Dongxiao,et al. A mechanistic model for permeability in deformable gas hydrate-bearing sediments[J]. Journal of Natural Gas Science and Engineering,2020,83.

Lei，Gang,Liao，Qinzhuo,Zhang，Dongxiao,&Patil，Shirish.(2020).A mechanistic model for permeability in deformable gas hydrate-bearing sediments.Journal of Natural Gas Science and Engineering,83.

Lei，Gang,et al."A mechanistic model for permeability in deformable gas hydrate-bearing sediments".Journal of Natural Gas Science and Engineering 83(2020).