灰岩真三轴水力压裂试验和数值模拟（英文）

发布时间：2024-07-06 09:23

　　水力压裂作为深部能源开发的关键技术,促进了现代石油工业的快速发展。为研究垂直井水力压裂裂缝扩展机制和岩石破坏模式,开展了真三轴水力压裂试验和数值模拟研究,分析了主应力差、注水排量、射孔角度和天然裂缝对水力裂缝扩展的影响。结果表明,灰岩裂缝扩展模式主要分为两类:单一垂直裂缝和纵横向交叉复杂裂缝。高排量下岩体的破裂压力更大,且易诱发二次压裂;而变排量加载更容易诱发形成裂缝网络。同时,灰岩在压裂过程中的声发射波形幅值在0.01～0.02 m V范围内,主频保持在230～300k Hz范围内。当射孔角度θ=45°时,易产生与天然裂缝交汇的"T"型水力裂缝,而当θ=30°时,易产生X型裂缝。研究结果可为进一步研究灰岩水力压裂机理提供参考。

【文章页数】：15 页

【文章目录】：
1 Introduction
2 Design and implementation of hydraulic fracturing test scheme
    2.1 Test scheme design
    2.2 Preparation of hydraulic fracturing sample
3 Test results and analysis
    3.1 Hydraulic fracturing curve and AE energy analysis
    3.2 Analysis of fracture propagation law in limestone hydraulic fracturing
        3.2.1 Single vertical fracture
        3.2.2 Transverse-longitudinal crossed fractures
4 Discrete element simulation of hydraulic fracturing of limestone
    4.1 Selection of micromechanical parameters
    4.2 Establishment and verification of hydraulic fracturing model
        4.2.1 Establishment of hydraulic fracturing model
        4.2.2 Calibration of fluid parameters
        4.2.3 Numerical simulation verification
    4.3 Hydraulic fracturing simulation of fractured limestone
5 Conclusions
Contributors
Conflict of interest



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