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A feasibility study of using frac‐packed wells to produce natural gas from subsea gas hydrate resources
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-12-18 , DOI: 10.1002/ese3.590 Liqun Shan 1 , ChunKai Fu 2 , Yanchang Liu 1 , Yanyan Qi 1
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-12-18 , DOI: 10.1002/ese3.590 Liqun Shan 1 , ChunKai Fu 2 , Yanchang Liu 1 , Yanyan Qi 1
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Frac‐packing is an attractive technique to stimulate production for gas hydrate reservoirs with the additional benefit of solving the problematic sand production problems. So far, there have been no documented mathematical models to predict the propagation of fractures and to forecast gas production for frac‐packed gas wells. An analytical model was derived to predict the propagation of a horizontal fracture and to assess the well productivity in frac‐packed gas wells in a gas hydrate reservoir. The model assumes a steady, single‐gas, Darcy flow in the matrix and fracture. Case analyses were performed for key design and operational parameters with the analytical model. The result shows that it is easy to control the relationship between the wellbore fracturing pressure and injecting flow rate, and thus, fractures of any length can be produced in the fracture penetration process of frac‐packed wells. Case analysis also shows that the gas production rate increases nonlinearly with the fracture propagation and increases linearly with the fracture width. The increase in fracture width turns out to be surprisingly effective in improving well productivity without threshold within the investigated range of width. It was also found that the increase in fracture permeability contributes more to the productivity of the frac‐packed wells than the increase in matrix permeability. The model also assumes no flow at the boundary of the reservoir, which may underestimate those gas hydrate reservoirs with pressure supply. This work uses a theoretical approach to estimate the productivity of the frac‐packed gas hydrate reservoirs, which may benefit in solving the sand production issue during the production process as well.
中文翻译：
使用压裂填充井从海底天然气水合物资源生产天然气的可行性研究
压裂充填是刺激天然气水合物储层生产的一项有吸引力的技术，具有解决有问题的制砂问题的额外好处。迄今为止，还没有文献记载的数学模型来预测裂缝的扩展和压裂压裂气井的产气量。推导了一个分析模型来预测水平裂缝的扩展并评估天然气水合物储层中压裂充填气井的产能。该模型假设基体中存在稳定的单一气体达西流，并且存在裂缝。通过分析模型对关键设计和操作参数进行了案例分析。结果表明，很容易控制井眼压裂压力与注入流量之间的关系，因此，在压裂井的压裂穿透过程中可能会产生任何长度的压裂。案例分析还表明，产气率随裂缝扩展而非线性增加，随裂缝宽度线性增加。事实证明，在研究的宽度范围内没有阈值的情况下，裂缝宽度的增加令人惊讶地有效地提高了产能。还发现，与基质渗透率的增加相比，裂缝渗透率的增加对压裂填充井的生产率的贡献更大。该模型还假设在储层边界处没有流动，这可能会低估那些有压力供应的天然气水合物储层。这项工作采用理论方法来估算压裂填充的天然气水合物气藏的产能，
更新日期：2019-12-18
中文翻译：
使用压裂填充井从海底天然气水合物资源生产天然气的可行性研究
压裂充填是刺激天然气水合物储层生产的一项有吸引力的技术，具有解决有问题的制砂问题的额外好处。迄今为止，还没有文献记载的数学模型来预测裂缝的扩展和压裂压裂气井的产气量。推导了一个分析模型来预测水平裂缝的扩展并评估天然气水合物储层中压裂充填气井的产能。该模型假设基体中存在稳定的单一气体达西流，并且存在裂缝。通过分析模型对关键设计和操作参数进行了案例分析。结果表明，很容易控制井眼压裂压力与注入流量之间的关系，因此，在压裂井的压裂穿透过程中可能会产生任何长度的压裂。案例分析还表明，产气率随裂缝扩展而非线性增加，随裂缝宽度线性增加。事实证明，在研究的宽度范围内没有阈值的情况下，裂缝宽度的增加令人惊讶地有效地提高了产能。还发现，与基质渗透率的增加相比，裂缝渗透率的增加对压裂填充井的生产率的贡献更大。该模型还假设在储层边界处没有流动，这可能会低估那些有压力供应的天然气水合物储层。这项工作采用理论方法来估算压裂填充的天然气水合物气藏的产能，
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