Coupled deformation–flow analysis for methane hydrate extraction

Klar, Assaf; Soga, Kenichi; Ng, Mya

doi:10.1680/geot.9.p.079-3799

Cited by 172 publications

(85 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Laboratory studies are useful for constructing a constitutive model for gas-hydrate-bearing sediments. However, few constitutive model for gas-hydrate-bearing sediments has been published [9], although there have been reports on laboratory studies concerning the triaxial compressive properties of natural and artificial gas-hydrate-bearing sediment samples [10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Elastic Model for Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediment Samples

et al. 2012

View full text Add to dashboard Cite

A constitutive model for marine sediments containing natural gas hydrate is essential for the simulation of the geomechanical response to gas extraction from a gas-hydrate reservoir. In this study, the triaxial compressive properties of artificial methane-hydrate-bearing sediment samples reported in an earlier work were analyzed to examine the applicability of a nonlinear elastic constitutive model based on the Duncan-Chang model. The presented model considered the dependences of the mechanical properties on methane hydrate saturation and effective confining pressure. Some parameters were decided depending on the type of sand forming a specimen. The behaviors of lateral strain versus axial strain were also formulated as a function of effective confining pressure. The constitutive model presented in this study will provide a basis for an elastic analysis of the geomechanical behaviors of the gas-hydrate reservoir in the future study, although it is currently available to a limited extent.

show abstract

Section: Introductionmentioning

confidence: 99%

A Nonlinear Elastic Model for Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediment Samples

et al. 2012

View full text Add to dashboard Cite

show abstract

“…This class of deformation, which is caused by changes in stress states, whether volume contraction or expansion, can be assessed based on the material stiffness. Many of reservoir-scale geomechanics simulators, including those presented by the Lawrence Berkeley National Laboratory (LBNL) group [40][41][42], by the Korea Advanced Institute of Science and Technology (KAIST) group [39,43], and by the Cambridge University group [44][45][46], adopt elastoplasticity to model sediment deformation behaviors. Thereby, one of the elastic moduli (typically Young's modulus or bulk Energies 2016, 9, 775 15 of 23 modulus), Poisson's ratio ν, and strength parameters (cohesion and friction angle, if Mohr-Coulomb yield criterion used) for material yielding are typically used as input parameters for describing elasto-plastic behavior.…”

Section: Stress-and Strain-dependent Young's Modulusmentioning

confidence: 99%

“…Therefore, it is presumed that the presence of hydrate causes increases in the air-entry value and the residual water saturation. To date, few reservoir-scale simulation studies have considered the effect of hydrate saturation on relative permeability; Klar et al [45,46] and Konno et al [58] incorporated the effect of hydrate saturation on the relative permeability of water and gas phases, as shown in Table 5. Therefore, the semi-empirical parameters describing sediment pore structures, such as relative permeability index N i , van Genuchten parameters a, b and c, and irreducible water and gas saturation, can be estimated using the water retention curve that was experimentally obtained for hydrate-free sediments.…”

Section: Relative Permeabilitymentioning

confidence: 99%

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

et al. 2016

View full text Add to dashboard Cite

This study investigates the geomechanical, hydraulic and thermal characteristics of natural sandy sediments collected during the Ulleung Basin gas hydrate expedition 2, East Sea, offshore Korea. The studied sediment formation is considered as a potential target reservoir for natural gas production. The sediments contained silt, clay and sand fractions of 21%, 1.3% and 77.7%, respectively, as well as diatomaceous minerals with internal pores. The peak friction angle and critical state (or residual state) friction angle under drained conditions were~26 • and~22 • , respectively. There was minimal or no apparent cohesion intercept. Stress-and strain-dependent elastic moduli, such as tangential modulus and secant modulus, were identified. The sediment stiffness increased with increasing confining stress, but degraded with increasing strain regime. Variations in water permeability with water saturation were obtained by fitting experimental matric suction-water saturation data to the Maulem-van Genuchen model. A significant reduction in thermal conductivity (from~1.4-1.6 to~0.5-0.7 W·m −1 ·K −1 ) was observed when water saturation decreased from 100% to~10%-20%. In addition, the electrical resistance increased quasi-linearly with decreasing water saturation. The geomechanical, hydraulic and thermal properties of the hydrate-free sediments reported herein can be used as the baseline when predicting properties and behavior of the sediments containing hydrates, and when the hydrates dissociate during gas production. The variations in thermal and hydraulic properties with changing water and gas saturation can be used to assess gas production rates from hydrate-bearing deposits. In addition, while depressurization of hydrate-bearing sediments inevitably causes deformation of sediments under drained conditions, the obtained strength and stiffness properties and stress-strain responses of the sedimentary formation under drained loading conditions can be effectively used to assess sediment responses to depressurization to ensure safe gas production operations in this potential target reservoir.

show abstract

“…atural gas hydrates are crystalline structures formed by natural gases (mainly methane, generally more than 96%) and pure water under the conditions of low temperature and high pressure [1][2][3]. More and more attention has been paid to methane hydrate development from hydrate-bearing sediments in deep water for its clean property N and the vast reserves.…”

Section: Introductionmentioning

confidence: 99%

Investigation method of borehole collapse with the multi-field coupled model during drilling in clayey silt hydrate reservoirs

Cheng

Wang

et al. 2018

Frattura Ed Integrità Strutturale

View full text Add to dashboard Cite

ABSTRACT. The global reserves of natural gas hydrates are extremely abundant, but hydrate reservoirs are usually clayey silt hydrate reservoirs with low strength, and borehole collapse is a key issue during the drilling operation. In the present work, both the investigation method and the finite element model that used for investigating borehole collapse in hydratebearing sediment are developed, and the superiority of the investigation method developed herein is also analyzed. The results show that changes in temperature and/or pore pressure do not necessarily lead to the hydrate dissociation. Hydrate dissociation occurs only when both temperature and pore pressure satisfy the conditions of hydrate dissociation. Moreover, the applicability of the investigation method developed herein is verified by comparing the equivalent plastic strains obtained by the coupled model developed in this paper and the simplified model respectively. In addition, the simplified model overestimates the extent of the wellbore collapse for the drilling operation in hydrate-bearing sediments. All these results demonstrate that both the investigation method and the finite element model can be used for borehole stability simulation in hydrate-bearing sediments. KEYWORDS.Hydrate-bearing sediments; Hydrate dissociation; Wellbore instability; Borehole collapse; Finite element analysis.Citation: Li, Q. C., Cheng, Y. F., Li, Q., Wang, F. L., Wei, J., Ding, J. P., Zhang, H. W., Song, B. J., Zhang, C., Yan, C. L., Investigation method of borehole collapse with the multi-field coupled model during drilling in clayey silt hydrate reservoirs, Frattura ed Integrità Strutturale, 45 (2018) 86-99.

show abstract

Coupled deformation–flow analysis for methane hydrate extraction

Cited by 172 publications

References 25 publications

A Nonlinear Elastic Model for Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediment Samples

A Nonlinear Elastic Model for Triaxial Compressive Properties of Artificial Methane-Hydrate-Bearing Sediment Samples

Geomechanical, Hydraulic and Thermal Characteristics of Deep Oceanic Sandy Sediments Recovered during the Second Ulleung Basin Gas Hydrate Expedition

Investigation method of borehole collapse with the multi-field coupled model during drilling in clayey silt hydrate reservoirs

Contact Info

Product

Resources

About