离散裂隙网络对页岩气井产能影响的数值模拟

发布时间：2018-05-25 04:11

本文选题：页岩气 + 离散裂隙网络　；参考：《煤田地质与勘探》2017年06期

【摘要】：页岩作为典型的非常规储层,基质孔隙小,渗透率极低,水平井多级水力压裂为其商业开发的主要手段。准确模拟页岩气产能,应同时考虑水力裂隙和天然裂隙的渗流。基于离散裂隙模型和等效连续模型建立页岩气渗流数学模型,利用有限元分析方法进行数值求解,研究不同走向裂隙组对页岩气井产能的影响。研究认为,页岩基质为气体的生产提供了主要气源,天然裂隙作为渗流的主要通道,将气体输送到水力裂缝,进而到达井筒。模拟结果表征,离散裂隙的渗流特征对于页岩气井的产能有重要影响。根据页岩储层的天然裂隙走向,可以优化相应的水平井方位。对于二维离散裂隙网络模型,水平井沿着2个裂隙组夹角的平分线更有利于生产。
[Abstract]:Shale is a typical unconventional reservoir with small porosity and very low permeability. Multilevel hydraulic fracturing in horizontal wells is the main means for its commercial development. The seepage of hydraulic fractures and natural fractures should be considered at the same time. Based on the discrete fissure model and the equivalent continuous model, the mathematical model of shale gas seepage should be established. It is considered that the shale matrix provides the main gas source for the production of gas, and the natural fissure is the main channel for the seepage, and the gas is transported to the hydraulic crack and then to the wellbore. The simulation results are characterized by the seepage characteristics of the discrete fissure. The productivity of shale gas wells has an important influence. According to the natural fracture trend of the shale reservoir, the corresponding horizontal well orientation can be optimized. For the two-dimensional discrete fissure network model, the horizontal well along the horizontal split line of the angle of the 2 fissure groups is more beneficial to production.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学力学与土木工程学院;
【基金】：国家自然科学基金项目(51674246) 江苏省大学生创新训练计划项目(201610290034X)~~
【分类号】：TE37

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