水平井压裂多裂缝同步扩展数值模拟

发布时间：2018-04-29 23:38

本文选题：水平井 + 多裂缝　；参考：《中南大学学报(自然科学版)》2017年07期

【摘要】：采用有限单元法对水平井压裂多裂缝同步扩展问题进行数值分析。考虑压裂过程中高压流体、岩层变形/破裂与裂缝扩展之间的多物理场耦合响应,建立多裂缝同步扩展力学模型;采用裂缝单元记录岩层破裂信息、确定裂缝扩展路径。应用有限元方法求解耦合模型并编制计算程序,模拟水平井多裂缝同步起裂、扩展和转向过程。研究结果表明:水平井多裂缝同步压裂,起裂压力相差较小;延伸压力受缝间应力干扰影响,中间裂缝处压力高于两侧裂缝;随裂缝扩展,多裂缝之间应力干扰效应提高,主应力方向偏转范围增大,促使复杂裂缝的形成;通过优化射孔簇间距与数量可增强裂缝间应力干扰效应,增加水平井多裂缝扩展的复杂性。
[Abstract]:The finite element method is used to analyze the synchronous propagation of multiple fractures in horizontal wells. Considering the coupling response of multi-physical field between deformation / fracture and fracture propagation of high-pressure fluid during fracturing, the mechanical model of synchronous propagation of multi-fracture is established, and fracture information is recorded by fracture unit to determine fracture propagation path. The coupling model is solved by finite element method and the calculation program is compiled to simulate the process of synchronous initiation, expansion and steering of multiple fractures in horizontal wells. The results show that the fracture initiation pressure of horizontal wells is smaller than that of multiple fractures, the stress interference effect between multiple fractures increases with the expansion of fractures, and the pressure at the middle fracture is higher than that at both sides of the fracture due to interfracture stress interference. By optimizing the spacing and quantity of perforating clusters, the stress interference effect between fractures can be enhanced, and the complexity of multi-fracture propagation in horizontal wells can be increased by increasing the deflecting range of principal stress direction and promoting the formation of complex fractures.
【作者单位】：中国石油大学(华东)储运与建筑工程学院;青海油田钻采工艺研究院;
【基金】：国家自然科学基金资助项目(51304230) 中央高校基本科研业务费基金资助项目(16CX05001A)~~
【分类号】：TE243;TE357

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