Production behavior and numerical analysis for 2017 methane hydrate extraction test of Shenhu, South China Sea

Chen, Lin; Feng, Yongchang; Okajima, Junnosuke; Komiya, Atsuki; Maruyama, Shigenao

doi:10.1016/j.jngse.2018.02.029

Cited by 209 publications

(71 citation statements)

References 38 publications

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“…The natural gas hydrates exploitation has been a key focus of the development of energy industry in some countries (Zhao et al, ). Several field tests for natural gas production from hydrate‐bearing sediments have been conducted around the world (Chen et al, ; Heeschen et al, ; Takahashi et al, ). The field tests have proved that the in situ dissociation of hydrate is an important way to exploit natural gas hydrate reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Hou

Zhao

et al. 2020

JGR Solid Earth

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The permeability of sediments is an important parameter that effects flow characteristics of the gas and water in the process of natural gas hydrates development. The distribution of gas hydrate is generally heterogeneous in porous media. It poses a great challenge to the permeability measurement of hydrate‐bearing sediments. To study the effect of heterogeneous distribution of methane hydrate on the permeability of porous media, methane hydrate formation in the sandstone and permeability measurement was carried out using a low‐field nuclear magnetic resonance (NMR) measurement system in situ conditions. The spatial distribution of methane hydrate in the core samples was determined by combining the T2 distribution with magnetic resonance imaging. The results show that the distribution of methane hydrate is heterogeneous in the core samples. The temporal and spatial variation of permeability happens in the process of hydrate dissociation. The heterogeneity of methane hydrate distribution severely affects the analysis of permeability change. Considering the heterogeneity of methane hydrate distribution, a new method was proposed to obtain the quantitative relationship between hydrate saturation and relative permeability based on magnetic resonance imaging and the equivalent seepage capacity method. The results show that the relative permeability models obtained by this method agree better with experimental results. The optimum coefficients of relative permeability models obtained by equivalent seepage capacity method change significantly in contrast with the direct fitting method. The variation of the optimum coefficient is up to 300% in this study. The model coefficients are related to the pore characteristic of hydrate‐free porous media.

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Section: Introductionmentioning

confidence: 99%

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Hou

Zhao

et al. 2020

JGR Solid Earth

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“…In 2017, Japan attempted twice to extract methane hydrate from the Nankai Trough using depressurization; they were not successful both times due to sand production and bad weather, respectively. In May 2017, China carried out extractions by depressurization in Shenhu area of the South China Sea, for 60 days; 300 000 m 3 of methane was produced continuously . Therefore, the depressurization technology is both promising and challenging.…”

Section: Introductionmentioning

confidence: 99%

Gas production from different classes of methane hydrate deposits by the depressurization method

et al. 2019

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Summary There are four primary classes of natural gas hydrate deposits in natural world. The differences between them are in the distribution of the methane hydrate, free gas, and free water layers. A reactor which the height was 120 mm and the inner diameter was 103 mm was used in hydrate formation and dissociation, and 17 thermocouples measured the distribution of temperature during the mining process. Different experimental means were applied to simulate three classes of methane hydrate deposits, in which water and glass beads filled in different orders. The hydrate samples were dissociated by depressurization, and the results showed no need to test a backpressure greater than 94% of the equilibrium pressure of methane hydrate. Class 1 sample's methane hydrate decomposition rate was slower than that of class 3 sample at the beginning of depressurization when backpressure was 2.3 and 2.6 MPa, but then, the opposite happened. The average dissociation rate decreased nearly linearly with the increase in backpressure for the class 1 samples.

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“…几乎同时进行的在中国南海神狐海域的采气试验, 在 60天里连续生产了约3.0×10 5 m 3 (5.0×10 3 m 3 /d)天然气 [7] (http://www.gmgs.cgs.gov.cn). [12] . 近年来针对实现长期稳定采气的利用系统的研究 [5,6,13] 还较为缺乏.…”

Section: 地层中在实际降压过程中未固结储层会随着采气的进行而发生形变从而导致井底压力升高甚至是unclassified

Oceanic methane hydrate utilization system design and reservoir scale numerical modeling

et al. 2018

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Production behavior and numerical analysis for 2017 methane hydrate extraction test of Shenhu, South China Sea

Cited by 209 publications

References 38 publications

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Study on the Effects of Heterogeneous Distribution of Methane Hydrate on Permeability of Porous Media Using Low‐Field NMR Technique

Gas production from different classes of methane hydrate deposits by the depressurization method

Oceanic methane hydrate utilization system design and reservoir scale numerical modeling

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