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Enhanced gas production by forming artificial impermeable barriers from unconfined hydrate deposits in Shenhu area of South China sea

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  • Zhao, Ermeng
  • Hou, Jian
  • Liu, Yongge
  • Ji, Yunkai
  • Liu, Wenbin
  • Lu, Nu
  • Bai, Yajie

Abstract

The absence of impermeable overburden and underburden layers makes it difficult to develop the unconfined hydrate deposits. Using numerical simulation method, the hydrate dissociation and gas production behaviors are fully investigated during depressurization in Shenhu Area based on the available geological data. Results show that depressurization cannot result in significant pressure drop due to the presence of permeable boundaries, which leads to low gas production rate but excessive water production. To overcome these disadvantages, the method of forming artificial impermeable barriers by injecting gels in the permeable overburden and underburden is proposed in this work. Moreover, the effect of the radius of artificial impermeable barriers on gas production is analyzed numerically. Simulation results show that the artificial impermeable barriers prevent large amounts of seawater from entering the production well during the depressurization process, which significantly enhances the depressurization effect, and thus promotes hydrate dissociation and gas production. By forming the 90-m artificial impermeable barriers, the hydrate dissociation percent is greatly enhanced from 8.9% to 45.4%, the cumulative CH4 production volume is increased from 4.46 × 106 ST m3 to 1.06 × 107 ST m3, while the average water production rate is remarkably decreased from 1412 m3/d to 360 m3/d.

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  • Zhao, Ermeng & Hou, Jian & Liu, Yongge & Ji, Yunkai & Liu, Wenbin & Lu, Nu & Bai, Yajie, 2020. "Enhanced gas production by forming artificial impermeable barriers from unconfined hydrate deposits in Shenhu area of South China sea," Energy, Elsevier, vol. 213(C).
    • Handle: RePEc:eee:energy:v:213:y:2020:i:c:s0360544220319332
    DOI: 10.1016/j.energy.2020.118826
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    Cited by:

    1. Wang, Qilin & Wang, Ziming & Li, Peng & Song, Yongchen & Wang, Dayong, 2022. "Numerical modeling of coupled behavior of gas production and mechanical deformation of gas hydrate reservoir in Shenhu area, South China Sea: Enlightenments for field monitoring and model verification," Energy, Elsevier, vol. 254(PA).
    2. Rui Song & Yaojiang Duan & Jianjun Liu & Yujia Song, 2022. "Numerical Modeling on Dissociation and Transportation of Natural Gas Hydrate Considering the Effects of the Geo-Stress," Energies, MDPI, vol. 15(24), pages 1-22, December.
    3. Zhong, Xiuping & Pan, Dongbin & Zhu, Ying & Wang, Yafei & Tu, Guigang & Nie, Shuaishuai & Ma, Yingrui & Liu, Kunyan & Chen, Chen, 2022. "Commercial production potential evaluation of injection-production mode for CH-Bk hydrate reservoir and investigation of its stimulated potential by fracture network," Energy, Elsevier, vol. 239(PB).
    4. Zhao, Ermeng & Hou, Jian & Ji, Yunkai & Liu, Yongge & Bai, Yajie, 2021. "Enhancing gas production from Class II hydrate deposits through depressurization combined with low-frequency electric heating under dual horizontal wells," Energy, Elsevier, vol. 233(C).
    5. Guo, Wei & Li, Yiming & Jia, Rui & Wang, Yuan & Tang, Gege & Li, Xiaolin, 2023. "Experimental study on mechanical properties of pore-filling and fracture-filling clayey silt hydrate-bearing sediments," Energy, Elsevier, vol. 284(C).
    6. 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).
    7. Zhong, Xiuping & Pan, Dongbin & Zhu, Ying & Wang, Yafei & Zhai, Lianghao & Li, Xitong & Tu, Guigang & Chen, Chen, 2021. "Fracture network stimulation effect on hydrate development by depressurization combined with thermal stimulation using injection-production well patterns," Energy, Elsevier, vol. 228(C).
    8. Mao, Peixiao & Wan, Yizhao & Sun, Jiaxin & Li, Yanlong & Hu, Gaowei & Ning, Fulong & Wu, Nengyou, 2021. "Numerical study of gas production from fine-grained hydrate reservoirs using a multilateral horizontal well system," Applied Energy, Elsevier, vol. 301(C).
    9. Li, Shuxia & Wu, Didi & Wang, Xiaopu & Hao, Yongmao, 2021. "Enhanced gas production from marine hydrate reservoirs by hydraulic fracturing assisted with sealing burdens," Energy, Elsevier, vol. 232(C).
    10. Bai, Yajie & Clarke, Matthew A. & Hou, Jian & Liu, Yongge & Lu, Nu & Zhao, Ermeng & Xu, Hongzhi & Chen, Litao & Guo, Tiankui, 2023. "Study on improved efficiency of induced fracture in gas hydrate reservoir depressurization development," Energy, Elsevier, vol. 278(C).
    11. Gu, Yuhang & Sun, Jiaxin & Qin, Fanfan & Ning, Fulong & Cao, Xinxin & Liu, Tianle & Qin, Shunbo & Zhang, Ling & Jiang, Guosheng, 2023. "Enhancing gas recovery from natural gas hydrate reservoirs in the eastern Nankai Trough: Deep depressurization and underburden sealing," Energy, Elsevier, vol. 262(PB).
    12. Zhang, Qi & Wang, Yanfei, 2023. "Comparisons of different electrical heating assisted depressurization methods for developing the unconfined hydrate deposits in Shenhu area," Energy, Elsevier, vol. 269(C).

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