Scholarlink

<p>In this research, a novel reservoir stimulation scheme combining impermeable artificial barriers and high-conductivity artificial fractures was introduced for gas hydrate extraction from clayey silt deposits, and the injection-production performance was numerically investigated using hydrates at the Shenhu SH2 site as the typical case scenario. The results indicated that impermeable barriers effectively addressed the challenges including boundary water intrusion, decomposition gas leakage, and injected hot fluid loss. Especially, artificial barriers and fractures exert a synergistic stimulation effect of “1 + 1 &gt; 2”. The average gas production rate increased logarithmically as fracture conductivity increased, whereas the gas-to-water ratio and energy ratio, presented an opposite trend. The impact of injection pressure and production pressure on productivity was limited relative to hot water temperature, whereas low-temperature and low-pressure injection were more conducive to water control and energy utilization. Furthermore, parameter optimization based on multivariate nonlinear models suggested that commercial productivity and the Class II development standard for offshore gas reservoirs were expected to be achieved. Therefore, the combination of artificial fractures and impermeable boundaries is promising for clayey silt hydrate reservoir stimulation, offering a viable development mode for marine challenging hydrate.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Numerical investigation of production performance of challenging gas hydrates from deposits with artificial fractures and impermeable barriers

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月13日

查看全文
  • Shuaishuai Nie,
  • Ke Liu,
  • Xiuping Zhong,
  • Yafei Wang,
  • Yalu Han,
  • Kangtai Xu,
  • Jian Song,
  • Jiangfei Li

摘要

In this research, a novel reservoir stimulation scheme combining impermeable artificial barriers and high-conductivity artificial fractures was introduced for gas hydrate extraction from clayey silt deposits, and the injection-production performance was numerically investigated using hydrates at the Shenhu SH2 site as the typical case scenario. The results indicated that impermeable barriers effectively addressed the challenges including boundary water intrusion, decomposition gas leakage, and injected hot fluid loss. Especially, artificial barriers and fractures exert a synergistic stimulation effect of “1 + 1 > 2”. The average gas production rate increased logarithmically as fracture conductivity increased, whereas the gas-to-water ratio and energy ratio, presented an opposite trend. The impact of injection pressure and production pressure on productivity was limited relative to hot water temperature, whereas low-temperature and low-pressure injection were more conducive to water control and energy utilization. Furthermore, parameter optimization based on multivariate nonlinear models suggested that commercial productivity and the Class II development standard for offshore gas reservoirs were expected to be achieved. Therefore, the combination of artificial fractures and impermeable boundaries is promising for clayey silt hydrate reservoir stimulation, offering a viable development mode for marine challenging hydrate.