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Experimental investigation on the decomposition characteristics of natural gas hydrates in South China Sea sediments by a micro-differential scanning calorimeter

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  • Ma, Shihui
  • Zheng, Jia-nan
  • Tang, Dawei
  • Lv, Xin
  • Li, Qingping
  • Yang, Mingjun

Abstract

Marine natural gas hydrate production has become a hot topic in recent years. There is still a long way to achieve the commercial production of marine hydrate reservoirs. The purpose of this work is to investigate the natural gas hydrate decomposition characteristics in the real marine sediments obtained from the South China Sea. A high-pressure micro-differential scanning calorimeter was employed to study the thermodynamic properties of natural gas hydrates. The results indicated that the increase in gas pressure or sediment salinity decreased the ice melting temperature by changing the vapor pressure of water. In addition, the decrease in sediment moisture from 40% to 30% increased the decomposition pressure of hydrates by 4.4 MPa at 278 K of sea bottom temperature, due to the water absorption capacity of the sediments increases the actual salinity furtherly. The influence of mixed gases on the decomposition pressure of hydrates was also investigated. The findings of this work on the effects of salinity and gas components on the decomposition pressure are significant to the spot safety production of marine natural gas hydrate reservoirs.

Suggested Citation

  • Ma, Shihui & Zheng, Jia-nan & Tang, Dawei & Lv, Xin & Li, Qingping & Yang, Mingjun, 2019. "Experimental investigation on the decomposition characteristics of natural gas hydrates in South China Sea sediments by a micro-differential scanning calorimeter," Applied Energy, Elsevier, vol. 254(C).
    • Handle: RePEc:eee:appene:v:254:y:2019:i:c:s0306261919313406
    DOI: 10.1016/j.apenergy.2019.113653
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    Cited by:

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    2. Zhao, Jie & Zheng, Jia-nan & Ma, Shihui & Song, Yongchen & Yang, Mingjun, 2020. "Formation and production characteristics of methane hydrates from marine sediments in a core holder," Applied Energy, Elsevier, vol. 275(C).
    3. Xie, Yan & Zhu, Yu-Jie & Cheng, Li-Wei & Zheng, Tao & Zhong, Jin-Rong & Xiao, Peng & Sun, Chang-Yu & Chen, Guang-Jin & Feng, Jing-Chun, 2023. "The coexistence of multiple hydrates triggered by varied H2 molecule occupancy during CO2/H2 hydrate dissociation," Energy, Elsevier, vol. 262(PA).
    4. Shi, Jihao & Li, Junjie & Usmani, Asif Sohail & Zhu, Yuan & Chen, Guoming & Yang, Dongdong, 2021. "Probabilistic real-time deep-water natural gas hydrate dispersion modeling by using a novel hybrid deep learning approach," Energy, Elsevier, vol. 219(C).
    5. Qi Nie & Shifan Zhang & Yuan Huang & Xianzhong Yi & Jiwei Wu, 2022. "Numerical and Experimental Investigation on Safety of Downhole Solid–Liquid Separator for Natural Gas Hydrate Exploitation," Energies, MDPI, vol. 15(15), pages 1-14, August.

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