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预制裂缝对煤系页岩水力压裂效果影响试验研究
Experimental study on hydraulic fracturing effect of pre-crack in coal shale
投稿时间: 2016-10-29  最后修改时间: 2017-03-11
DOI:
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 measure shale  Shale gas extraction  Hydraulic fracturing  Pre-crack  Acoustic emission  Horizontal stress difference
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点研发计划专项,辽宁省自然科学基金,辽宁省高等学校优秀人才支持计划
作者单位E-mail
唐巨鹏 辽宁工程技术大学力学与工程学院 jupengt@126.com 
路江伟 辽宁工程技术大学力学与工程学院 18241892073@163.com 
许鹏 辽宁工程技术大学力学与工程学院  
丁佳会 辽宁工程技术大学力学与工程学院  
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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 the pre-crack on the hydraulic fracturing of coal shale, regarding coal shale as the research object in the Fuxin Sun jiawan coal mine. The test was carried out by using triaxial hydraulic fracturing equipment. The water was used as fracturing fluid. The stress state of coal shale was simulated by applying axial pressure and confining pressure on specimen. The characteristics of energy release in test process were measured by the acoustic emission instrument. The influence of the pre-crack arrangement mode and the horizontal stress difference on the water injection pressure and the acoustic emission energy signal were analyzed. The research results show that the degree of crack propagation and hydraulic fracturing effect are the best under the condition of 180° phase angle. In the simulation experiment, the steady phase after the peak of the acoustic emission energy curve corresponds to the second expansion phase of the hydraulic fracture. The horizontal stress difference increases the maximum water injection pressure and accelerates the crack propagation velocity. It is beneficial to the crack initiation and second expansion of the hydraulic fracture. The crack propagation velocity is the fastest, the crack propagation degree and hydraulic fracturing effect are the best when the horizontal stress difference is 0.2 MPa.
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