页岩气藏水平井分段多簇压裂复杂裂缝产量模拟

发布时间：2018-05-14 08:26

本文选题：页岩气 + 分段多簇压裂　；参考：《天然气地球科学》2016年08期

【摘要】：现有页岩储层压裂水平井产能预测模型均采用与实际不符的平面裂缝假设,压后产能预测不准确。针对页岩储层压裂裂缝非对称非平面的实际复杂形态,基于流体扩散理论和压降叠加原理,建立了气藏渗流和裂缝渗流模型,采用空间离散建立了产量计算模型,通过数值分析方法求解,对页岩气藏水平井分段多簇压裂复杂裂缝产量进行了模拟。结果表明:真实非平面复杂裂缝产量远高于理想平面裂缝产量;天然裂缝对非平面裂缝形态和产量具有重要影响;三簇同时延伸形成的裂缝,中间缝产量比外侧缝产量低,产量差距在生产初期较大,随着时间增加,差距减小。外侧裂缝对导流能力比中间缝敏感;随着裂缝导流能力的增加,产量增加,但并非线性关系,增加的幅度逐渐减小。
[Abstract]:The existing productivity prediction models of fractured horizontal wells in shale reservoirs are based on plane fracture assumptions which are not in accordance with the actual conditions, and the prediction of post-compression productivity is not accurate. In view of the actual complex shape of fractured asymmetric non-plane in shale reservoir, based on fluid diffusion theory and pressure drop superposition principle, the seepage and fracture percolation models of gas reservoir are established, and the production calculation model is established by space discretization. Based on the numerical analysis method, the production of complex fractures in horizontal wells of shale gas reservoir is simulated by multi-cluster fracturing. The results show that the real production of complex non-plane fractures is much higher than that of ideal plane cracks, the natural fractures have important influence on the morphology and yield of non-planar fractures, the output of the middle joints is lower than that of the outer fractures, and the output of the three clusters extending simultaneously is lower than that of the outer fractures. The yield gap is larger at the beginning of production, and decreases with the increase of time. The lateral fracture is more sensitive to the conductivity than the middle joint, and with the increase of the fracture conductivity, the output increases, but not in a linear relationship, and the amplitude of increase decreases gradually.
【作者单位】：西南石油大学石油与天然气工程学院;西南石油大学油气藏地质及开发工程国家重点实验室;
【基金】：国家自然科学基金重大项目“页岩气动态随机裂缝控制与无水压裂液研究”(编号:51490653) 西南石油大学研究生创新基金“基于多尺度流动特征的页岩气缝网压裂产能模拟”(编号:CXJJ2015029)联合资助
【分类号】：TE328

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