Enhanced gas production from low-permeability hydrate reservoirs based on embedded discrete fracture models: Influence of branch parameters

Guo, Yang; Li, Shuxia; Qin, Xuwen; Lu, Cheng; Wu, Didi; Liu, Lu; Zhang, Ningtao

doi:10.1016/j.energy.2023.128886

Cited by 7 publications

(3 citation statements)

References 46 publications

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“…There have been five offshore and six permafrost field tests of hydrate globally, yet none have managed to achieve efficient and stable production. 5−8 The depressurization method, due to its efficacy, convenience, and cost-effectiveness, 9,10 has been utilized in all offshore and four permafrost field tests. However, hydrate dissociation not only impacts the mechanical stability of the formation but also severely constrains the efficient production of hydrates in the later stages of depressurizationbased production due to insufficient reservoir heat.…”

Section: Introductionmentioning

confidence: 99%

“…There have been five offshore and six permafrost field tests of hydrate globally, yet none have managed to achieve efficient and stable production. − The depressurization method, due to its efficacy, convenience, and cost-effectiveness, , has been utilized in all offshore and four permafrost field tests. However, hydrate dissociation not only impacts the mechanical stability of the formation but also severely constrains the efficient production of hydrates in the later stages of depressurization-based production due to insufficient reservoir heat. − The CO 2 replacement method can simultaneously maintain reservoir mechanical properties, release heat to promote the dissociation of CH 4 hydrates, and facilitate the sequestration of CO 2 . − However, the problem of inefficiency still exists with the replacement method.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO₂ Replacement Using a PSO Algorithm

Guo,

Li,

Huang

et al. 2024

Energy Fuels

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Natural gas hydrate (NGH) is a solid clathrate compound formed by water and natural gas at low temperatures and high pressures characterized by abundant resources and a wide distribution. The depressurization-assisted CO 2 replacement method has the advantage of concurrently producing CH 4 while sequestering CO 2 , rendering a promising approach for exploiting NGH. Some experiments have been conducted on depressurization-assisted CO 2 replacement. However, a comparative analysis of the depressurization and CO 2 replacement application sequences remains ambiguous. In this study, a numerical model for depressurization-assisted CO 2 replacement was established to clarify the application sequences, analyze the influence of different factors, and propose the optimal production scheme based on the optimization algorithm. Results indicated that the formation of the CO 2 hydrate promoted the dissociation of the CH 4 hydrate. Depressurization, followed by CO 2 replacement represented the optimal production sequence, with cumulative gas production (V p ) and CO 2 sequestration ratios (R CO2 ) higher than those of CO 2 replacement, followed by depressurization by 3.17 and 1.61%, respectively. As the production pressure decreased from 7 to 3 MPa, both V p and R CO2 increased. The CO 2 injection rate had little effect on V p but affected R CO2 , while the CO 2 injection temperature had less effect on any of them. According to the particle swarm optimization algorithm (PSO) results, the optimal scheme was a bottom hole pressure of 3 MPa, a CO 2 injection rate of 7000 m 3 /d, a CO 2 injection temperature of 22 °C, and a production and injection well spacing of 280 m. This study provides insights into the potential applications of depressurization-assisted CO 2 replacement in the field tests of hydrate production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO₂ Replacement Using a PSO Algorithm

Guo,

Li,

Huang

et al. 2024

Energy Fuels

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“…The current proposed methods for NGH development include depressurization, − thermal stimulation, − chemical stimulation, − CO 2 replacement, − solid fluidization, , and their combination. − Among those methods, depressurization has gained significant attention for its practical feasibility and potential efficiency for NGH production, as supported by several field tests, − and has been the subject of numerous studies in the past. This technique involves reducing the pressure in the NGH reservoir to a point below the equilibrium pressure of the hydrate phase, thereby inducing the decomposition of hydrate into water and gas.…”

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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Multiphase flow and geomechanical behavior induced by gas production from silty-clay hydrate reservoirs through different horizontal well scenarios

Cao,

Sun,

Qin

et al. 2024

Computers and Geotechnics

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Enhanced gas production from low-permeability hydrate reservoirs based on embedded discrete fracture models: Influence of branch parameters

Cited by 7 publications

References 46 publications

Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO₂ Replacement Using a PSO Algorithm

Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO₂ Replacement Using a PSO Algorithm

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

Multiphase flow and geomechanical behavior induced by gas production from silty-clay hydrate reservoirs through different horizontal well scenarios

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Enhanced gas production from low-permeability hydrate reservoirs based on embedded discrete fracture models: Influence of branch parameters

Cited by 7 publications

References 46 publications

Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO2 Replacement Using a PSO Algorithm

Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO2 Replacement Using a PSO Algorithm

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

Multiphase flow and geomechanical behavior induced by gas production from silty-clay hydrate reservoirs through different horizontal well scenarios

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Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO₂ Replacement Using a PSO Algorithm

Numerical Simulation and Optimization of Well Parameters for Depressurization-Assisted CO₂ Replacement Using a PSO Algorithm