循环渐进升压对页岩压裂效果的影响

doi:10.13722/j.cnki.jrme.2017.1559

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摘要为了揭示循环渐进升压对页岩压裂效果的影响规律，开展页岩真三轴水力压裂试验，对比分析一次性压裂与循环渐进升压致裂的破裂效果。试验结果表明：(1) 基于泵压曲线、声发射能量对比分析，一次性压裂方式，倾向于单次造缝；循环渐进升压致裂方式，倾向于多次造缝和沿着不同方向造缝。(2) 基于声发射定位展布特征对比分析，一次性压裂声发射定位，呈现条带状分布，对应单一裂缝；而循环压裂声发射定位呈现离散化分布特征，对应更大压裂体积范围。(3) 基于宏观裂纹形态、数量和分形维数对比分析，循环压裂方式能显著提高页岩缝网密度和改善页岩渗透特性，可以优化和改进现场水力压裂施工方法。(4) 基于扩展有限元数值模拟分析，循环注入方式能产生更加偏转和路径更长主裂缝，沿途倾向支生更多次生裂隙，可以增加缝网密度并提升体积压裂的效果。

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	赵子江1
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	刘大安1
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	崔振东1
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	唐铁吾1
	2
	韩伟歌1
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关键词 ：岩石力学, 真三轴水压致裂, 循环渐进升压, 声发射, 裂缝扩展, 裂隙分形维数, 对比试验

Abstract：In order to reveal the influence of cyclic progressive pressure on the fracturing effect of shale，the true triaxial hydraulic fracturing test of shale samples was carried out，and the rupture effects of one-time fracturing and progressive pressure fracturing were compared and analyzed. The experimental results show that：(1) Based on the comparison of fracturing pressure curve，and AE energy curve，one-time fracturing method is prone to produce a single main fracture and generate relative sample hydraulic fracture networks. Progressive fracturing method tends to create multiple fractures and complex networks. (2) Based on the analysis of the AE positioning，the one-time fracturing AE location shows a liner distribution with respect to a single fracture，and cyclic fracturing AE location presents a dense distribution which filled a larger volume of test samples. (3) Based on the comparative analysis of the morphological，quantitative and fractal dimensions of macroscopic cracks，the cyclic progressive method can significantly improve the seam network density and the permeability of test samples，hence optimizes field hydraulic fracturing methods. (4) Based on the extended finite element numerical simulation，the cyclic progressive fracturing method can produce long and devious main fractures and tend to generate more secondary fractures along the main fracture，which can increase the density of fractured seams networks and enhance the effect of volumetric fracturing.

Key words： rock mechanics true triaxial hydraulic fracturing cyclic progressive fracturing acoustic emission crack propagation fractal dimension comparative test

引用本文:

赵子江1，2，刘大安1，2，崔振东1，2，唐铁吾1，2，韩伟歌1，2. 循环渐进升压对页岩压裂效果的影响[J]. 岩石力学与工程学报, 2019, 38(S1): 2779-2789.
ZHAO Zijiang1，2，LIU Daan1，2，CUI Zhendong1，2，TANG Tiewu1，2，HAN Weige1，2. Cyclic progressive pressure on the fracturing effect of shale. , 2019, 38(S1): 2779-2789.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1559 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/2779

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