压裂过程中水力裂缝动态宽度实验研究

发布时间：2018-03-21 05:11

本文选题：岩石力学　切入点：水力压裂　出处：《岩石力学与工程学报》2017年09期 　论文类型：期刊论文

【摘要】：裂缝宽度及其变化规律对验证水力压裂模型及指导压裂施工设计具有重要意义。由于水力裂缝宽度比其长度和高度小3~4个量级,且储层埋藏较深,目前尚无法直接测量实际地层中的水力裂缝宽度,仅能大致通过模型估算或数值模拟获得。通过在室内压裂试件中布置单根或多根布拉格光纤光栅(FBG)应变传感器,对类混凝土材料的水力裂缝宽度进行多点同步动态监测,得到不同时刻多点水力裂缝宽度的变化,并依据裂缝宽度变化得到了裂缝扩展速度,从而对水力压裂裂缝扩展中的尺度变化进行了过程描述。实验研究表明,室内水力压裂模拟实验中水力裂缝的宽度为微米级别,裂缝扩展速度为0.1 mm/s量级;在水力压裂过程中,裂缝宽度随裂缝扩展呈现波动式变化,并非随着裂缝扩展单调增加。研究结果对认识水力压裂裂缝的扩展及提升压裂工艺技术具有重要参考价值。
[Abstract]:Fracture width and its variation law are of great significance for verifying hydraulic fracturing model and guiding fracturing operation design. Because the width of hydraulic fracture is 3 ~ 4 orders of magnitude smaller than its length and height, and the reservoir is buried deeply, At present, it is not possible to directly measure the hydraulic fracture width in the actual formation, which can only be obtained by model estimation or numerical simulation, by arranging a single or multiple FBG-based strain sensors in an indoor fracturing specimen. The hydraulic crack width of concrete like material is monitored by multi-point synchronous dynamic monitoring, and the variation of hydraulic crack width at different time points is obtained, and the crack propagation speed is obtained according to the variation of hydraulic crack width. The experimental results show that the width of hydraulic fracture is micrometer, and the propagation speed of fracture is 0. 1 mm/s in the process of hydraulic fracturing. The fracture width fluctuates with the fracture propagation and does not increase monotonously with the fracture propagation. The research results have important reference value for understanding the hydraulic fracturing fracture propagation and improving the fracturing technology.
【作者单位】：中国石油大学(北京)石油工程学院;
【基金】：国家自然科学基金资助项目(51322404) 中国石油大学(北京)青年创新团队计划(C21601)~~
【分类号】：TE357.1

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