Numerical simulations of sand migration during gas production in hydrate-bearing sands interbedded with thin mud layers at site NGHP-02-16

Uchida, Shun; Lin, Jeen-Shang; Myshakin, Evgeniy M.; Seol, Yongkoo; Boswell, Ray

doi:10.1016/j.marpetgeo.2018.10.046

Cited by 59 publications

(28 citation statements)

References 11 publications

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“…The numerical results for ω p agree well with the expression derived from the continuum equations. As can be seen, for a Poisson's ratio smaller than 0.3, the values of ω p and ω q are rather similar and revolve around two (the value taken by Uchida et al [58], based on [57], in their recent simulations). Considering that the effective stress formulation is associated with a Poisson's ratio smaller than 0.3 (as larger values are usually kept for total stress analysis, with 0.5 being the value of undrained conditions), the similarity between ω p and ω q implied that the suggestion of Uchida et al [44] for a single parameter (ω 1 in [44]) is sufficient.…”

Section: Elasticity-based Stress Relaxationmentioning

confidence: 68%

“…The specific value of ω 1 was never evaluated by Uchida et al [44], but instead, a value of 1.0 was arbitrarily selected for the sake of sensitive analysis, acknowledging the need for further fundamental research on the topic. In Uchida et al [58], a value of two was used based on the limited results of Cohen et al [57]. Equation (1) infers that all components of the tensor σ are equally affected by grain detachment.…”

Section: Sand Migration Effect On Stressesmentioning

confidence: 99%

“…Furthermore, they have developed a simple elastic expression of an ideal isotropic case. Uchida et al [58] have incorporated some of these findings in the simulations of sand migration in hydrate-bearing sediments interbedded with mud layers, during gas production.…”

Section: Introductionmentioning

confidence: 99%

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Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

2019

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Past experience of gas production from methane-hydrate-bearing sediments indicates that sand migration is a major factor restricting the production of gas from methane-hydrate reservoirs. One important geotechnical aspect of sand migration is the influence of grain detachment on the existing stresses. This paper focuses on understanding and quantifying the nature of this aspect using different approaches, with a focus on discrete element method (DEM) simulations of sand detachment from hydrate-bearing sand samples. The investigation in the paper reveals that sand migration affects isotropic and deviatoric stresses differently. In addition, the existence of hydrate moderates the magnitude of stress relaxation. Both of these features are currently missing from continuum-based models, and therefore, a new constitutive model for stress relaxation is suggested, incorporating the research findings. Model parameters are suggested based on the DEM simulations. The model is suitable for continuum mechanics-based simulations of gas production from hydrate reservoirs.

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Section: Elasticity-based Stress Relaxationmentioning

confidence: 68%

Section: Sand Migration Effect On Stressesmentioning

confidence: 99%

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Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

2019

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“…Sand migration is found to be affected by non-uniform hydrate dissociation (Uchida et al, 2018). To incorporate non-uniform hydrate dissociation within a simple setting, this study considers a two-dimensional axisymmetric homogeneous gas hydrate-bearing reservoir with a limited production zone.…”

Section: Sand Migration Analyses For Homogeneoues Gas Hydrate-bearingmentioning

confidence: 99%

“…The model was applied to conduct several case studies and one of the key findings was that shearing deformation caused by non-uniform hydrate dissociation contributed to sand migration both in magnitude and duration (e.g. Uchida et al, 2018). In Uchida et al (2016a), the sensitivity of sand migration to each parameter was evaluated but it only considered a very thin layer with uniform hydrate dissociation.…”

Section: Introductionmentioning

confidence: 99%

Variance-based determination of dominant model parameters for sand migration in homogeneous gas hydrate-bearing reservoir

Uchida

Seol

Yamamoto

2019

JGS Special Publication

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Sand migration in gas hydrate-bearing reservoir poses a serious problem for a successful long-term gas production. Because gas production is achieved through hydrate dissociation, often driven by depressurization, the process of sand migration involves highly coupled multiphysics behavior. For example, hydrate dissociation causes sediment deformation and may increase the potential of sand migration but hydrate dissociation can also increase permeability, which may lower hydraulic gradient at a given flow rate, leading to reduction in sand migration. Other factors include that sand inflow (or outflow) would cause the increase (or decrease) in pore pressure due to void volume change and thus may halt (or accelerate) hydrate dissociation. An analytical thermo-hydro-mechanical sand migration model to incorporate these interacting features requires a number of parameters and it is important to quantify the significance of each parameter to this complex process of sand migration in gas hydrate-bearing reservoir. This study, therefore, conducts a series of sand migration analyses in field-scale homogeneous gas hydrate-bearing reservoir subjected to depressurization and presents the relative importance of each parameter to the volume of produced sand from a production zone. It is found that the volume of produced sand is mostly dominated by the parameter converting shearing deformation to sand detachment potential and by the parameter increasing critical hydraulic gradient for sand detachment with hydrate saturation.

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Protocol for sand control screen design of production wells for clayey silt hydrate reservoirs: A case study

Ning

et al. 2020

Energy Science & Engineering

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The process of extracting natural gas from gas hydrate‐bearing sediments (GHBS) may yield significant sand influx due to the metastable nature of GHBS. Selecting appropriate sand control media is vital to addressing the challenges caused by excessive sand production. This study proposes a protocol called holding coarse expelling fine particles (HCEFP) for sand control design. The protocol aims to provide a new optimization method for screen mesh size selection for clayey silt hydrate reservoirs. Detailed optimizing procedures of proper candidate screen mesh sizes in hydrate exploitation well in clayey silt hydrate reservoirs are depicted based on the HCEFP. Then, the site W18, which is located in the Shenhu area of the northern South China Sea, is taken as an example to illustrate the optimization procedure for screen mesh size selection. The results reveal that complete solid retention via a standalone screen is rarely beneficial as high clay contents can adversely affect wellbore productivity due to excessive plugging. Screen aperture size selection for clayey silt hydrate wells should strike a balance between retaining coarser particles and avoiding screen blockage by the relatively fine particles. Furthermore, longitudinal heterogeneity of the PSDs also increases the difficulties associated with sand control design. Multistage sand control optimization is necessary in hydrate production wells. For Site W18, we recommend that the entire production interval can be divided into two subintervals for multistage sand control operations.

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Numerical simulations of sand migration during gas production in hydrate-bearing sands interbedded with thin mud layers at site NGHP-02-16

Cited by 59 publications

References 11 publications

Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

Micromechanical Investigation of Stress Relaxation in Gas Hydrate-Bearing Sediments Due to Sand Production

Variance-based determination of dominant model parameters for sand migration in homogeneous gas hydrate-bearing reservoir

Protocol for sand control screen design of production wells for clayey silt hydrate reservoirs: A case study

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