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Stimulation effect of network fracturing combined with sealing boundaries on the depressurization development of hydrate reservoir in China's offshore test site

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  • Guo, Wei
  • Zhong, Xiuping
  • Chen, Chen
  • Zhang, Pengyu
  • Liu, Zhao
  • Wang, Yuan
  • Tu, Guigang

Abstract

This study investigated the stimulation of reservoir reconstruction by network fracturing combined with sealing boundaries (RC-HFBS) for hydrate development in China's offshore test site. We first studied the influence of different boundary-sealing characters on development performance. Then, the response of development performance to key production parameters including fracture conductivity (CF), fracture spacing (SF), and production pressure (Pp) under permeable and impermeable boundaries was studied. Lastly, the long-term commercial CH4 production potentials were evaluated. Results showed that compared to unreconstruction reservoirs, the CH4 production of RC-HFBS increased by 11.1 times, and the gas-to-water ratio increased by 13.3 times. The harm of permeable boundaries on reservoir depressurization leads to a short effective stimulation time of fractures (about 1000 out of 3650 days) and results in the insensitivity of exploitation performance to production parameters. However, the impermeable boundaries improve the fractures' stimulation, meanwhile, making exploitation performance extremely sensitive to production parameters. For RC-HFBS, commercial production can be realized by diverse production parameter combinations, including SF, CF, and Pp are 15 m, 10D•cm, 4 MPa; 15 m, 10D•cm, 2 MPa; 25 m, 10D•cm, 2 MPa; 5 m, 40D•cm, 4.5 MPa.

Suggested Citation

  • Guo, Wei & Zhong, Xiuping & Chen, Chen & Zhang, Pengyu & Liu, Zhao & Wang, Yuan & Tu, Guigang, 2024. "Stimulation effect of network fracturing combined with sealing boundaries on the depressurization development of hydrate reservoir in China's offshore test site," Energy, Elsevier, vol. 302(C).
    • Handle: RePEc:eee:energy:v:302:y:2024:i:c:s0360544224015251
    DOI: 10.1016/j.energy.2024.131752
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