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天然裂缝对煤岩体水力裂缝扩展影响研究
供稿: 马耕;张帆;刘晓;冯丹 时间: 2018-11-19 次数:

作者:马耕张帆;刘晓;冯丹

作者单位;河南理工大学能源科学与工程学院;河南能源化工集团研究院有限公司;中原经济区煤层(页岩)气河南省协同创新中心;重庆大学煤矿灾害动力学与控制国家重点实验室

摘要:为了研究煤岩体中天然裂缝的存在对水力压裂裂缝延伸及形态的影响,以人工预制裂缝相似材料试件为研究对象,采用室内模拟实验设备,通过注入定排量压裂液,在分析压裂曲线的基础上,研究了天然裂缝对水力裂缝起裂及裂缝形态的影响特征。研究表明,天然裂缝的存在降低了煤岩体的起裂压力,水力裂缝形态呈现3种情况:水力裂缝沿着天然裂缝面延伸;水力裂缝遇到天然裂缝后停止延伸;水力裂缝绕过天然裂缝接着延伸。本研究对煤层气(瓦斯)抽采影响范围的确定及产量预测具有一定的理论指导意义。

基金:河南省教育厅科学技术研究重点项目(13A440320);安全生产重大事故防治关键技术重点科技项目(henan-066-2013AQ;henan-0007-2015AQ);

关键词:煤岩体;水力压裂;裂缝扩展;天然裂缝;

DOI:10.16186/j.cnki.2016.02.007

分类号:TD712.6

Abstract:In order to study how natural fractures effect the extension and morphology of hydraulic fracture in coal and rock mass,the influence features were studied about natural fracture on hydraulic fracture extension and morphology by the means of using specimens made of similar materials that containing artificial present fracture as the research objects and indoor simulation equipments,injecting fracturing fluids on fixed displacement and on the basis of analyzing the fracturing curves. The study had shown that: the initiation pressure reduced because of the existence of natural fractures in coal and rock mass,the hydraulic fracture morphology presented three cases: that were the hydraulic fracture spread along natural fracture surface,stoping or continuing to spread after bypassing the natural fracture. This study has some theoretical guidance on the determination about the extraction range and yield prediction of coalbed methane( gas) through research.

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