Mechanical experiments and constitutive model of natural gas hydrate reservoirs

Yan, Cheng; Cheng, Yuanfang; Li, Menglai; Han, Zhongying; Zhang, Huaiwen; Li, Qingchao; Teng, Fei; Ding, Jian

doi:10.1016/j.ijhydene.2017.06.135

Cited by 97 publications

(51 citation statements)

References 24 publications

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“…In the case of M0, short compaction stage, elastic stage, yield stage, and long plastic stage were observed in that order. Yan [22] reported a similar result with tri-axial compressive tests on samples of natural gas hydrate-bearing sediment, but the peak strength was not obvious in those experiments. The deviator stress of specimens M2 and M3 decreased during the depressurization process.…”

Section: The Geotechnics Of Methane Hydrate-bearing Sediments Dissocimentioning

confidence: 59%

Tri-Axial Shear Tests on Hydrate-Bearing Sediments during Hydrate Dissociation with Depressurization

Wang

et al. 2018

Energies

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A series of tri-axial shear tests were carried out to determine the stress and strain characteristics, as well as the volume deformation of methane hydrate-bearing sediments during gas hydrate dissociation. An innovative type of depressurization was adopted with a high-pressure and low-temperature tri-axial apparatus. Results show that: (1) decrease in pore pressure during the shear process may result in the failure of hydrate-bearing sediments, but they did not collapse completely due to high effective confining pressure; (2) depressurization leads to the contraction of volumetric strain and the ultimate deformation shows no difference compared to that prior depressurization;(3) high saturation hydrate-bearing sediments were more sensitive to depressurization, which could be due to the methane hydrate acting as a skeleton structure at some sites when the pore hydrates' saturation is high.

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Section: The Geotechnics Of Methane Hydrate-bearing Sediments Dissocimentioning

confidence: 59%

Tri-Axial Shear Tests on Hydrate-Bearing Sediments during Hydrate Dissociation with Depressurization

Wang

et al. 2018

Energies

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“…21 Due to constraints of surrounding rock formation, the rock at this point cannot deform in all directions under the pressure of overlying formation and the minimum horizontal insitu stress can be determined according to Equation (5). In-situ stress comprises pressure of overlying formation and horizontal in-situ stress.…”

Section: Fluid-solid Coupling Modelmentioning

confidence: 99%

“…The pressure of overlying formation can be obtained through integral operation of density of the upper formation. 21 Due to constraints of surrounding rock formation, the rock at this point cannot deform in all directions under the pressure of overlying formation and the minimum horizontal insitu stress can be determined according to Equation (5).…”

Section: Fluid-solid Coupling Modelmentioning

confidence: 99%

“…1 Methane hydrates are recognized as important follow-up clean energy resources because of its advantages of large resources, high energy density and low pollution. 4,5 Limited by hydrate phase equilibrium conditions and geothermal gradients, methane hydrates are mainly distributed in deep seas and permafrost regions, with shallow depth of storage and poor cementation of sediments. 4,5 Limited by hydrate phase equilibrium conditions and geothermal gradients, methane hydrates are mainly distributed in deep seas and permafrost regions, with shallow depth of storage and poor cementation of sediments.…”

Section: Introductionmentioning

confidence: 99%

“…2,3 Global methane hydrates have twice the carbon reserves of proven fossil energies such as oil, coal and natural gas. 4,5 Limited by hydrate phase equilibrium conditions and geothermal gradients, methane hydrates are mainly distributed in deep seas and permafrost regions, with shallow depth of storage and poor cementation of sediments. [6][7][8][9] Scholars from various countries have carried out a lot of research on the mechanical properties of the formation with hydrate, and found that hydrate reservoirs have low strength and strong creep properties.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wellbore shrinkage during drilling in methane hydrate reservoirs

Yan

Yang

Yan³

et al. 2019

Energy Science & Engineering

Self Cite

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Methane hydrates as a clean and abundant energy source, have attracted the attention of the world. However, the instability of hydrate reservoirs makes it difficult to drill production wells. After drilling, the creep properties of hydrate reservoir would cause wellbore shrinkage, which will affect the drilling safety. This study is to analysis law of wellbore shrinkage after a hydrate well drilled. The results demonstrate that wellbore shrinkage mainly results from plastic deformation and creep deformation. The largest and smallest values are separately found in the directions of the maximum and minimum horizontal in‐situ stress. With the increase of initial in‐situ stress ratio, wellbore shrinkage linearly rise. Under the condition of low horizontal in‐situ stress ratio, wellbore shrinkage is mainly determined by creep deformation. Under the condition of high horizontal in‐situ stress ratio, wellbore shrinkage commonly depends on plastic deformation and creep deformation. With deepening methane hydrate reservoirs, wellbore shrinkage shows a nonlinear increase. For formations with higher hydrate saturation, larger wellbore shrinkage would occur. The research results can provide a theoretical basis for the selection of drilling method while drilling in hydrate formations.

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A hypoplastic model for hydrate‐bearing sand considering hydrate saturation and grain breakage

Qian,

Wu,

et al. 2023

Num Anal Meth Geomechanics

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We present a hypoplastic model to capture the mechanical responses of hydrate‐bearing sands by incorporating hydrate saturation and grain breakage. In our model, a new degradation scalar is introduced to account for the effects of hydrate bonding evolution on strength. We also adopt the variable critical state line to assess the effects of hydrate saturation and relative breakage ratio at high confining pressure. This model is validated by modeling a series of laboratory tests.

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Mechanical experiments and constitutive model of natural gas hydrate reservoirs

Cited by 97 publications

References 24 publications

Tri-Axial Shear Tests on Hydrate-Bearing Sediments during Hydrate Dissociation with Depressurization

Tri-Axial Shear Tests on Hydrate-Bearing Sediments during Hydrate Dissociation with Depressurization

Wellbore shrinkage during drilling in methane hydrate reservoirs

A hypoplastic model for hydrate‐bearing sand considering hydrate saturation and grain breakage

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