| 唐巨鹏*,路江伟,许鹏,丁佳会.预制裂缝对煤系页岩水力压裂效果影响的试验研究[J].实验力学,2018,33(1):150~158 |
| 预制裂缝对煤系页岩水力压裂效果影响的试验研究 |
| Experimental investigation on the effect of prefabricated cracks on hydrofracture of coal measure shale |
| 投稿时间：2016-10-29 修订日期：2017-03-11 |
| DOI：10.7520/1001-4888-16-225 |
| 中文关键词: 煤系页岩 页岩气开采 水力压裂 预制裂缝 声发射 水平应力差 |
| 英文关键词:coal measures shale shale gas exploitation hydrofracture prefabricated cracks acoustic emission horizontal stress difference |
| 基金项目:国家自然科学基金面上项目(51374119)，国家重点研发计划专项(2016YFC0600901)，辽宁省自然科学基金(2014020156)，辽宁省高等学校优秀人才支持计划(LR2015028) |
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| 中文摘要: |
| 为研究预制裂缝对煤系页岩水力压裂效果的影响，以阜新孙家湾矿煤系页岩为研究对象，采用三轴水力压裂试验设备进行实验室压裂模拟试验。以清水为压裂液，通过对试件施加轴压和围压模拟煤系页岩所处地应力状态。利用声发射仪监测试验过程中的能量释放特征，分析了预制裂缝布置方式和水平应力差对注水压力及声发射能量信号的影响。研究结果表明：采用双预制裂缝180°相位角的布置方式，试件裂缝扩展程度最高，水力压裂效果最佳；模拟试验中，声发射能量曲线峰值之后的平稳阶段与水力裂缝二次扩展阶段相对应；水平应力差增大使最大注水压力降低，加快了预制裂缝的扩展速度，有利于水力裂缝的起裂扩展和二次扩展；水平应力差为0.2MPa时预制裂缝扩展最快，裂缝扩展程度最大，压裂效果较好。 |
| 英文摘要: |
| In order to study the effect of prefabricated cracks on hydofracture of coal measures shale, taking coal measures shale of Fuxin Sun jiawan coal mine as object of study, tri-axial hydraofracture simulation experiment was carried out in laboratory. Taking water as fracturing fluid, in-situ earth stress of coal measures shale was simulated by applying axial pressure and confining pressure to specimen. The characteristics of energy release during experiment process were monitored and measured by acoustic emission instrument. The influence of prefabricated cracks arrangement and the horizontal stress difference on water injection pressure and acoustic emission energy signal were analyzed. Experimental results show that under the condition of double prefabricated cracks with 180° phase angle, specimen's crack propagation degree is the highest, and hydraofracture effect is the best. In simulation experiment, stable stage after the peak value of acoustic emission energy curve corresponds to the secondary expansion phase of hydraofracture. The increase of horizontal stress difference decreases the maximum water injection pressure and accelerates propagation of prefabricated cracks, which is beneficial to crack initiation and secondary expansion of hydraofracture. When horizontal stress difference is 0.2MPa, the crack propagation is the fastest, and crack propagation degree and hydraofracture effect are the best. |
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