Coupled temperature field model of gas-hydrate formation for thermal fluid fracturing

Wang, Zhiyuan; Liao, Youqiang; Zhang, Guoqing; Sun, Baojiang; Sun, Xiaohui; Deng, Xuejing

doi:10.1016/j.applthermaleng.2018.01.039

Cited by 38 publications

(15 citation statements)

References 28 publications

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“…Discretization of the virtual work equation of the solid phase into the grid by the Lagrangian method, fluid flows through these grid and satisfies the continuity equation, as shown in Equation (3). The seepage process of the fluid follows Darcy's law.…”

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. 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.…”

Section: Introductionmentioning

confidence: 99%

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Wellbore shrinkage during drilling in methane hydrate reservoirs

Yan

Yang

Yan³

et al. 2019

Energy Science & Engineering

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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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Section: Fluid-solid Coupling Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wellbore shrinkage during drilling in methane hydrate reservoirs

Yan

Yang

Yan³

et al. 2019

Energy Science & Engineering

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“…They concluded that the permeability improvement, which raised the average gas production rate by one order of magnitude, might be more reliable than the aggressive depressurization on the gas recovery enhancement. Hence, enhancing the permeability to assist depressurization is necessary [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Propagation Characteristics of Hydraulic Fracture in Clayey-Silt Sediments

et al. 2021

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The low permeability of clayey-silt hydrate reservoirs in the South China Sea affects the thermal and pressure conductivity of the reservoir, which is difficult to spread to the far end of the wellbore and achieve commercial gas production. In this respect, enhancing the permeability to assist depressurization is necessary. Hydraulic fracturing is a promising reservoir stimulation method for gas hydrate reservoirs. Up to now, majorities of research focus on the fracability of hydrate-bearing sandy sediments, but the studies rarely involved fracture propagation characteristics of clayey-silt sediments in the hydrate dissociation area. In this paper, three sets of hydraulic fracturing experiments under different confining pressure were carried out using the clayey-silt sediments in the Shenhu Area. Computed tomographic (CT) images indicated that clayey-silt sediments could be artificially fractured, and the fracturing fluid could induce tensile fractures and local shear fractures. A multimorphological fracture zone occurred near the borehole. Furthermore, the greater the confining pressure imposed, the greater the breakdown pressure was, and the microfracture arose more easily. The fractures at the top were generally wider than those at the bottom with the same confining pressure. The experimental results could reveal the fracture initiation and propagation mechanism of clayey-silt sediments and provide theoretical support for hydraulic fracture in the hydrate dissociation area.

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“…The gas production potential of hydrate reservoirs is mainly affected by three factors, including the production method, the configuration of the production well, and the reservoir condition. Although some novel and promising approaches are conducive to stimulating gas production potential from NGH reservoirs, [24][25][26][28][29][30][31]63 gas recovery enhancement is mainly dependent on gas hydrate resources in essence. If the reserves for gas production are deficient, even though the production strategies are strengthened, the enhancement of productivity is still limited.…”

Section: Introductionmentioning

confidence: 99%