Enhancing the gas production efficiency of depressurization-induced methane hydrate exploitation via fracturing
Enhancing the gas production efficiency of depressurization-induced methane hydrate exploitation via fracturing
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提高甲烷水合物压裂降压采气效率
DOI：
10.1016/j.fuel.2020.119740
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发表时间：
2020-12
期刊：
影响因子：
7.4
通讯作者：
Yang Lei
中科院分区：
文献类型：
--
作者：
Zhao Jiafei;Xu Lei;Guo Xianwei;Li Qingping;Lv Xin;Fan Qi;Zhao Jie;Dong Hongsheng;Wang Bin;Yang Lei
现有的含水合物沉积物采气现场试验大多存在压力传播困难，导致产能和能源效率较低。压裂在页岩气生产中显示出巨大的潜力；因此，在本研究中，我们将这一技术引入到实验室规模的天然气水合物生产中。通过对不同压裂方式下天然气水合物分解行为的数值分析，研究了不同压裂方式下天然气水合物的产气动态。结果表明，压裂能显著促进本征渗透率较低的水合物沉积物在降压过程中的压力传播，从而有利于提高采气动态。裂缝深度是提高采气效率的关键，压裂对平均产气量的最大增产率可达13.1%。此外，储层显热在低渗透率岩心中对水合物分解的贡献有限，及时、充足的供热对后续天然气生产具有重要意义。本研究结果说明了压裂对降压开采天然气水合物提高采气效率的影响，这将为其在低渗透率海相和多年冻土水合物油藏现场试验中的潜在应用提供重要的指导作用。
Most of the existing field tests of gas recovery from hydrate-bearing sediments suffer from the difficulty in pressure propagation, leading to a low productivity and energy efficiency. Fracturing has shown enormous potential in the shale gas production; thus in this study, we introduced this technique into the laboratory-scale gas hydrate production. The performance of gas production was investigated through numerically analyzing the gas hydrate dissociation behavior under different fracturing patterns. The results indicate that fracturing can significantly facilitate the pressure propagation in the hydrate sediments with a low intrinsic permeability during depressurization, thereby contributing to a better gas production performance. Fracture depth plays a critical role in promoting the gas production efficiency; the maximal enhancement ratio of average production rate by fracturing could attain 13.1%. Moreover, the contribution of reservoir’s sensible heat in hydrate dissociation is limited in the core with a low permeability; timely and sufficient heat supply is thus important for the successive gas production. The findings of this study illustrate the effects of fracturing on enhancing the gas production efficiency of depressurization-induced gas hydrate exploitation; this will provide important guidance for its potential application in the field test of marine and permafrost hydrate reservoir where low permeability is commonly encountered and an enhancing technique is much required.
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