A 3D modeling study of effects of heterogeneity on system responses in methane hydrate reservoirs with horizontal well depressurization

Guo, Xuyang; Yan, Jin; Zi, Jingyu; Lin, Jiaying; Zhu, Bolong

doi:10.1016/j.jgsce.2023.205001

Cited by 9 publications

(8 citation statements)

References 47 publications

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“…Furthermore, the 2D cross-sectional model revealed that anisotropies in permeabilities of high-turbidity sediments were extremely greater than in other blocks, indicating that fines or clay layers horizontally distributed in reservoirs could impede vertical fluid flow, complicating chemical injections or gas production from upper/lower MH layers. Since many marine MH reservoirs are formed in turbidite sediments with MH layers ranging from 0.2 to 0.5 m [19,20], the grout body in each layer would not exceed this height. To enhance sand control and gas production from this type of reservoir, well completions using casing pipes with denser perforations or Johnson screens connected to all target MH layers are recommended.…”

Section: Discussionmentioning

confidence: 99%

A Study on the Heterogeneity and Anisotropy of the Porous Grout Body Created in the Stabilization of a Methane Hydrate Reservoir through Grouting

Liu,

Kurihara

2024

Methane

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To solve the sand problem during the depressurization of methane hydrate (MH), we proposed a method to build a porous grout body with sufficient permeability and strength around the wellbore through inhibitor pre-injection and grouting, and verified its effectiveness and potential in our previous research using artificial cores created with silica sand and alternative hydrates such as TBAB- hydrate and iso-butane hydrate. However, all of the artificial cores mentioned above were created with high homogeneity, injected, cured, and had their physical properties measured in the vertical direction, which differs from real reservoir conditions. To investigate the effects of grouting in a more realistic fluid flow, we conducted further experiments using horizontal 1D cores, 1D cubic models, and a 2D cross-sectional model mimicking the near wellbore. These experiments revealed that (1) the generated gas somewhat suppressed the effects of grouting as in the case of previous experiments, and (2) grouted reservoirs would be heterogenous and anisotropic due to the fluid densities and the distribution of grout particles and turbidite sediments, but sufficient permeability and satisfactory strength could still be attained. The above series of experiments demonstrated that our method has the potential to effectively produce actual MH, preventing sand problems even in heterogeneous and anisotropic grouted reservoirs.

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Section: Discussionmentioning

confidence: 99%

A Study on the Heterogeneity and Anisotropy of the Porous Grout Body Created in the Stabilization of a Methane Hydrate Reservoir through Grouting

Liu,

Kurihara

2024

Methane

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“…They enable a comprehensive assessment of reservoir behavior. As an example, in a series of studies, Sangnimnuan et al (2018), Guo et al (2021) and Guo et al (2023) proposed a coupling strategy for the quantification of temporal and spatial evolution of pressure, stress, and temperature in hydrocarbon-bearing formation, where stress-dependent reservoir rock behaviors are comprehensively analyzed. The characterization of rock deformation and failure requires the use of accurate modeling techniques.…”

Section: Introductionmentioning

confidence: 99%

The experimental and numerical analysis of elastic rock mechanical properties in tight conglomerate rock samples: a case study in Junggar Basin

Qi,

Li,

Zhao

et al. 2024

Front. Energy Res.

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Tight conglomerate rocks consist of gravels and rock matrices. The existence of these stiff gravels leads to heterogeneity in conglomerates and makes it difficult to characterize rock mechanical properties, which then affects drilling and hydraulic fracturing operations in tight conglomerate hydrocarbon-bearing reservoirs. This case study introduces a series of experimental and numerical analyses for the better understanding of rock deformation and elastic wave propagation patterns in a tight conglomerate reservoir in Junggar Basin, China. Tri-axial compression tests, acoustic test, and finite element modeling of rock deformation and elastic wave propagation in conglomerate rocks are presented. Experimentally tested samples exhibit good brittleness and shearing failure patterns, while well correlated static-dynamic elastic moduli and P-S wave velocities are captured. Numerical results show that the existence of stiff gravels leads to strong direction-dependent stress and strain anisotropies. Stress concentrations are also induced by gravels radially and axially. In the elastic wave domain, stiff gravels facilitate the propagation of elastic waves. The gravel close to the wave source also induces stronger compressive/tensile states in the wave domain, indicating that the existence of gravels in conglomerates can alter waveforms. This integrated approach improves the quantitative understanding of stress, strain, and elastic wave responses in heterogeneous tight conglomerates. This case study also serves as a reference for the brittleness evaluation and geomechanical evaluation in the study area. The contribution of this work is primarily about the integrated experimental study, solid deformation modeling, and elastic wave modeling of tight conglomerate rocks.

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“…Three-dimensional realistic stratigraphic characterization and reservoir response are an important part of hydrate reservoir research in recent years. 27 The three-dimensional hydraulic fracture theory of hydrate reservoirs is significant for improving the fracturing mechanism of hydrate reservoirs. Compared with the two-dimensional fracturing model, the full three-dimensional hydraulic fracturing model can obtain a more accurate fracture morphology.…”

Section: Introductionmentioning

confidence: 99%

“…And the accuracy of the two-dimensional hydraulic fracture simulation in the FEM can be further improved. Three-dimensional realistic stratigraphic characterization and reservoir response are an important part of hydrate reservoir research in recent years . The three-dimensional hydraulic fracture theory of hydrate reservoirs is significant for improving the fracturing mechanism of hydrate reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Analysis of 3D Hydraulic Fracture Morphology and Fracture Critical Parameters in Hydrate-Bearing Sediments in the South China Sea Using Extended Finite Elements

Liu,

Yu,

et al. 2023

Energy Fuels

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Hydraulic fracturing is a technology used to improve the fluid flow performance of hydrate-bearing sediments (HBSs). It enhances the pore structure of HBSs and increases the porosity and permeability, thereby improving the exploitation efficiency of natural gas hydrates. However, most of the analytical models are two-dimensional, and there is an obvious gap between the critical parameters of cracks and the experimental results. In this study, a new singlecluster model of hydraulic fracturing for the horizontal well is established with available data from site GMGS3-W19 of the South China Sea (SCS) based on the three-dimensional (3D) extended finite element method (XFEM). The hydraulic fracturing behavior of HBSs for different perforation angles, hydrate saturation, horizontal in situ geo-stress coefficient, and injection rate is investigated, and the initiation and propagation mechanism of hydraulic fractures is revealed in a threedimensional scale. The results showed that with the increase of hydrate saturation, the ability of hydrate to connect the sediment skeleton is enhanced, and the HBSs have a more vital ability to resist fluid pressure. The remaining pores in the HBSs are filled; the degree of pressure holding in the fracture increases; the fracture development is hindered; and the difficulty of fracture initiation increases.

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A 3D modeling study of effects of heterogeneity on system responses in methane hydrate reservoirs with horizontal well depressurization

Cited by 9 publications

References 47 publications

A Study on the Heterogeneity and Anisotropy of the Porous Grout Body Created in the Stabilization of a Methane Hydrate Reservoir through Grouting

A Study on the Heterogeneity and Anisotropy of the Porous Grout Body Created in the Stabilization of a Methane Hydrate Reservoir through Grouting

The experimental and numerical analysis of elastic rock mechanical properties in tight conglomerate rock samples: a case study in Junggar Basin

Analysis of 3D Hydraulic Fracture Morphology and Fracture Critical Parameters in Hydrate-Bearing Sediments in the South China Sea Using Extended Finite Elements

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