Positioning of horizontal well-bore in the hydrate reservoir using a custom developed coupled THMC solver

Wani, Sahil; Samala, Rahul; Kandasami, Ramesh Kannan; Chaudhuri, Abhijit

doi:10.1016/j.compgeo.2023.105618

Cited by 6 publications

(2 citation statements)

References 65 publications

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“…Based on these phenomenological observations, simple, accurate, and reliable models are required to describe the geomechanical behavior of gas hydrates in sedimentary environments. Precise behavioral modeling of gas hydrate sediments (both increase/decrease in stiffness and dilation/contraction) is crucial for understanding their distribution and assessing their potential as an alternate energy source. − …”

Section: Introductionmentioning

confidence: 99%

Disturbed State Concept-Based Model Incorporating Strain-Softening Behavior for Gas Hydrate Sediments

Wani,

Kandasami,

Kumar

et al. 2024

Energy Fuels

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Gas extraction from methane hydrate reservoirs results in significant changes to pore pressure, causing soil deformation and progressive failure. Current advanced constitutive models, which are capable of capturing this deformation process, are often complex, computationally expensive, and challenging to implement in numerical solvers. Hence, simpler models are generally preferred; however, these models fail to predict critical geomechanical aspects such as strain softening and dilation. To address this limitation, the present study proposes a unified constitutive model based on the disturb state concept (DSC), considering the state variables such as hydrate saturation, temperature, and effective confining pressure for gas hydrate sediments. The stress−strain relationship is derived by combining two distinct responses: a hyperbolic hardening response that extends the stress−strain behavior prior to the peak stress state and a DSC approach to capture the post-peak softening and dilation response. Furthermore, the model is rigorously validated by utilizing multiple sets of triaxial experimental data of gas hydrate sediments under different initial conditions. This comprehensive validation process ensured the robustness and reliability of the proposed model. Finally, the efficacy of the model is analyzed based on the energy absorption capacity and index of agreement approach.

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Section: Introductionmentioning

confidence: 99%

Disturbed State Concept-Based Model Incorporating Strain-Softening Behavior for Gas Hydrate Sediments

Wani,

Kandasami,

Kumar

et al. 2024

Energy Fuels

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“…Some studies indicate that the vertical location of horizontal wells significantly influences production efficiency, impacted by reservoir temperature–pressure gradients and variations in gas and water densities. − Moreover, depressurization-induced pore pressure reduction can increase the effective stress within the NGH reservoir, potentially causing stratum deformation or even shear damage. − By adjusting the vertical location of the horizontal well, the gas production and reservoir subsidence can be significantly changed. − However, current assessments of horizontal well locations exhibit a weak integration of gas production and geomechanical response. Meanwhile, some NGH reservoirs have been shown to have a complex phase condition with multiple layers from top to bottom, including a hydrate-bearing layer (HBL), three-phase layer (TPL), and free-gas layer (FGL), ,, and this will further bring uncertainties.…”

Section: Introductionmentioning

confidence: 99%

Well Location Evaluation of Depressurized Production from the Multilayer Gas Hydrate Reservoir

Liu,

Li,

Zhang

et al. 2024

Energy Fuels

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The success of natural gas hydrate (NGH) production test in 2020 at the South China Sea suggests that horizontal wells have the potential to enhance the productivity of low-permeability NGH reservoirs. However, the vertical location of the horizontal well can significantly impact gas production and reservoir mechanical response, with additional uncertainties in multilayer reservoirs. Based on geological data from W17 deposit in the South China Sea, this study conducts a numerical analysis on the impact of well location during depressurization production of a multilayer NGH reservoir by horizontal well. And the productionsubsidence performance index (PSPI) is introduced for quantitative evaluation of the production performance under the combined consideration of natural gas production and seafloor subsidence.The results indicate that, first, the highest gas production rate is observed in case F-1 [well location at the top of the free-gas layer (FGL)] in the initial stage and in case H-4 [well location at the lower middle of the hydrate-bearing layer (HBL)] in the later stage, which is 4.01 × 10 4 and 0.24 × 10 4 m 3 •day −1 , respectively. Second, when the well location is at the top of HBL, an earlier disappearance of the low-permeability barrier brought by the solid hydrate filling leads to the faster water production and reservoir pressure drop, which further contributes to the seafloor subsidence. Finally, when the weights of normalized subsidence (1 − N S ) and normalized cumulative gas production (N P ) are equal, after 3000 days of production, the well location at the bottom of the HBL (case H-5) performs the best, achieving a PSPI of 0.82, whereas the well location at the top of the HBL (case H-1) performs the poorest, with a PSPI of only 0.20. This study can provide a reference for the vertical location of horizontal wells during depressurization of multilayer NGH reservoirs.

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MS‐IS Hypoplastic Model Considering Stiffness Degradation Under Cyclic Loading Conditions

Wani,

Alipour,

Kandasami

et al. 2024

Num Anal Meth Geomechanics

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Modelling the cyclic response of granular materials is key in the design of several geostructures. Over the years, numerous constitutive models have been proposed to predict the cyclic behaviour of granular materials. However, pertaining to the hypoplastic constitutive models, one of the significant limitations is their inability to accurately predict the geomechanical response during the unloading and reloading phases. This study introduces an extension of the MS‐IS hypoplastic model designed to enhance the predictions during non‐monotonic loading conditions. Addressing the limitations observed in the hypoplastic models during the unloading and reloading phases, the proposed model incorporates an additional stiffness feature. This new stiffness function is integrated into the foundational framework to enhance the model's overall stiffness response. For the unloading phase, the introduction of a stiffness degradation factor aims to modify the volumetric response and account for the realistic stiffness degradation. Additionally, for the reloading phase, stiffness is now a function of the mean effective stress. The novel model's performance is validated against experimental data, encompassing diverse loading and boundary conditions.

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Positioning of horizontal well-bore in the hydrate reservoir using a custom developed coupled THMC solver

Cited by 6 publications

References 65 publications

Disturbed State Concept-Based Model Incorporating Strain-Softening Behavior for Gas Hydrate Sediments

Disturbed State Concept-Based Model Incorporating Strain-Softening Behavior for Gas Hydrate Sediments

Well Location Evaluation of Depressurized Production from the Multilayer Gas Hydrate Reservoir

MS‐IS Hypoplastic Model Considering Stiffness Degradation Under Cyclic Loading Conditions

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