Effect of pressure drawdown rate on the fluid production behaviour from methane hydrate-bearing sediments

Yin, Zhenyuan; Wan, Qing-Cui; Gao, Qiang; Linga, Praveen

doi:10.1016/j.apenergy.2020.115195

Cited by 66 publications

(54 citation statements)

References 58 publications

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“…S nw = S w − S wr 1 − S wr (15) where S w is the water saturation. This model employs two parameters.…”

Section: Lawrence Berkeley National Laboratory (Lbnl) Modelmentioning

confidence: 99%

“…In the past few decades, limited field tests [11][12][13][14] or laboratory experiments [15][16][17] have been carried out to explore the fluid production performance at the field or core scale. In addition, the fluid production efficiency of hydrate reservoirs under different NGH dissociation methods is also normally evaluated by a variety of numerical simulators [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

et al. 2022

Energies

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Natural gas hydrates (NGHs) are regarded as a new energy resource with great potential and wide application prospects due to their tremendous reserves and low CO2 emission. Permeability, which governs the fluid flow and transport through hydrate-bearing sediments (HBSs), directly affects the fluid production from hydrate deposits. Therefore, permeability models play a significant role in the prediction and optimization of gas production from NGH reservoirs via numerical simulators. To quantitatively analyze and predict the long-term gas production performance of hydrate deposits under distinct hydrate phase behavior and saturation, it is essential to well-establish the permeability model, which can accurately capture the characteristics of permeability change during production. Recently, a wide variety of permeability models for single-phase fluid flowing sediment have been established. They typically consider the influences of hydrate saturation, hydrate pore habits, sediment pore structure, and other related factors on the hydraulic properties of hydrate sediments. However, the choice of permeability prediction models leads to substantially different predictions of gas production in numerical modeling. In this work, the most available and widely used permeability models proposed by researchers worldwide were firstly reviewed in detail. We divide them into four categories, namely the classical permeability models, reservoir simulator used models, modified permeability models, and novel permeability models, based on their theoretical basis and derivation method. In addition, the advantages and limitations of each model were discussed with suggestions provided. Finally, the challenges existing in the current research were discussed and the potential future investigation directions were proposed. This review can provide insightful guidance for understanding the modeling of fluid flow in HBSs and can be useful for developing more advanced models for accurately predicting the permeability change during hydrate resources exploitation.

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“…S nw = S w − S wr 1 − S wr (15) where S w is the water saturation. This model employs two parameters.…”

Section: Lawrence Berkeley National Laboratory (Lbnl) Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

et al. 2022

Energies

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“…The hydrate-bearing sediment has complex pore structures, unique interfacial properties, and various mineral compositions, prompting huge contrasts between the formation of gas hydrates in the confined space and that in the free space [19][20][21][22][23]. The formation process, structure, and distribution of natural gas hydrates in sediments have become focal points of exploring natural gas hydrates [24][25][26]. Therefore, it is essential to understand the physical and chemical properties of natural gas hydrate in sediments [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Advances in Characterizing Gas Hydrate Formation in Sediments with NMR Transverse Relaxation Time

Liu

Zhan

et al. 2022

Water

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The formation process, structure, and distribution of gas hydrate in sediments have become focal points in exploring and exploiting natural gas hydrate. To better understand the dynamic behavior of gas hydrate formation in sediments, transverse relaxation time (T2) of nuclear magnetic resonance (NMR) is widely used to quantitatively characterize the formation process of gas hydrate and the change in pore characteristics of sediments. NMR T2 has been considered as a rapid and non-destructive method to distinguish the phase states of water, gas, and gas hydrate, estimate the saturations of water and gas hydrate, and analyze the kinetics of gas hydrate formation in sediments. NMR T2 is also widely employed to specify the pore structure in sediments in terms of pore size distribution, porosity, and permeability. For the recognition of the advantages and shortage of NMR T2 method, comparisons with other methods as X-ray CT, cryo-SEM, etc., are made regarding the application characteristics including resolution, phase recognition, and scanning time. As a future perspective, combining NMR T2 with other techniques can more effectively characterize the dynamic behavior of gas hydrate formation and pore structure in sediments.

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“…Current estimations of the hydrate-containing hydrocarbon gas available at standard conditions ranges from 10 15 to 10 18 m 3 , which is twice as much as the conventional fossil energy (Moridis et al, 2009a). If NGH can be exploited in a safe and efficient way to produce natural gas and replace traditional fossil fuels, the problem of global energy shortage and environmental pollution can be greatly alleviated (Liang et al, 2020;Yin et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of Combined Brine Flooding With Electrical Heating–Assisted Depressurization for Exploitation of Natural Gas Hydrate in the Shenhu Area of the South China Sea

Zhang

Wang

2022

Front. Earth Sci.

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The Shenhu area of the South China Sea (SCS) is one of the most promising fields for natural gas hydrate (NGH) exploitation. However, previous studies conclude that using only depressurization is inefficient for this challenging hydrate deposits surrounded by permeable water zones, which requires assistance by thermal stimulation to promote hydrate decomposition and methane recovery. However, traditional thermal stimulation methods with hot water or steam injection induce massive heat loss along the wellbore. In addition, in situ electrical heating only results in a limited high temperature region due to low thermal conductivity of hydrate deposits. Therefore, we numerically investigate the performance of combined brine flooding with electrical heating–assisted depressurization in horizontal wells for exploitation of natural gas hydrate in the SCS, which simultaneously possesses the merits of low heat loss and enhanced heat transfer by convection. Our simulation results show that thermal stimulation by combined brine flooding with electrical heating can significantly enhance hydrate dissociation and methane recovery. After 20 years of production, the cumulative methane production of combined brine flooding with electrical heating–assisted depressurization is 1.41 times of that conducted by the only depressurization method. Moreover, the energy efficiency can be improved by reducing electrical heating time, and terminating electrical heating with 70% hydrate dissociation achieves the highest net energy gain. In addition, methane recovery and net energy gain increases with electrical heating power and brine injection pressure but with a decreasing rate. Therefore, the selection of electrical heating power and brine injection pressure should be performed carefully and comprehensively considering both the efficiency of gas production and risks of geological hazard. It is hoped that our research results will provide reference and guidance for the development of a similar NGH reservoir in order to promote the industrial development process of NGH.

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Effect of pressure drawdown rate on the fluid production behaviour from methane hydrate-bearing sediments

Cited by 66 publications

References 58 publications

Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

Permeability Models of Hydrate-Bearing Sediments: A Comprehensive Review with Focus on Normalized Permeability

Advances in Characterizing Gas Hydrate Formation in Sediments with NMR Transverse Relaxation Time

Numerical Simulations of Combined Brine Flooding With Electrical Heating–Assisted Depressurization for Exploitation of Natural Gas Hydrate in the Shenhu Area of the South China Sea

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