基于零厚度黏聚力单元的水力压裂裂隙空间分布影响分析
TE377; 作为页岩气开采关键技术,水力压裂在目标岩层产生大量裂隙,构成页岩气有效运输通道.因此,研究裂隙的空间分布和影响因素具有重要意义.采用连续-非连续方法,通过ins-coh程序在ABAQUS有限元模型全域内批量嵌入零厚度黏聚力单元,得到计算模型.考虑到水力压裂中的流固耦合,编写用户子程序确定孔隙压力初始场分布,并给出压裂阶段压裂液的流动准则和流固耦合方程.随着压裂液的注入,黏聚力单元发生破坏,连贯的张开区域形成页岩气运输通道.在验证该方法可行性基础上,结合西南某地区页岩气储层典型地质条件,进行三维水力压裂数值模拟.模拟结果显示:该方法能够合理模拟高水压下压裂液在岩体中流动,岩体裂隙面...
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| Published in | 煤炭学报 Vol. 43; no. z2; pp. 393 - 402 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | Chinese |
| Published |
武汉大学土木建筑工程学院,湖北武汉430072
01.12.2018
岩土与结构工程安全湖北省重点实验室,湖北武汉430072 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0253-9993 |
| DOI | 10.13225/j.cnki.jccs.2018.1122 |
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| Abstract | TE377; 作为页岩气开采关键技术,水力压裂在目标岩层产生大量裂隙,构成页岩气有效运输通道.因此,研究裂隙的空间分布和影响因素具有重要意义.采用连续-非连续方法,通过ins-coh程序在ABAQUS有限元模型全域内批量嵌入零厚度黏聚力单元,得到计算模型.考虑到水力压裂中的流固耦合,编写用户子程序确定孔隙压力初始场分布,并给出压裂阶段压裂液的流动准则和流固耦合方程.随着压裂液的注入,黏聚力单元发生破坏,连贯的张开区域形成页岩气运输通道.在验证该方法可行性基础上,结合西南某地区页岩气储层典型地质条件,进行三维水力压裂数值模拟.模拟结果显示:该方法能够合理模拟高水压下压裂液在岩体中流动,岩体裂隙面萌生、扩展、贯通的完整破坏过程.最后,通过设计多组模型进行对比分析,探究注液速度、初始裂隙间距和长度对裂隙空间分布的影响,为实际工程的方案设计提供指导意见. |
|---|---|
| AbstractList | TE377; 作为页岩气开采关键技术,水力压裂在目标岩层产生大量裂隙,构成页岩气有效运输通道.因此,研究裂隙的空间分布和影响因素具有重要意义.采用连续-非连续方法,通过ins-coh程序在ABAQUS有限元模型全域内批量嵌入零厚度黏聚力单元,得到计算模型.考虑到水力压裂中的流固耦合,编写用户子程序确定孔隙压力初始场分布,并给出压裂阶段压裂液的流动准则和流固耦合方程.随着压裂液的注入,黏聚力单元发生破坏,连贯的张开区域形成页岩气运输通道.在验证该方法可行性基础上,结合西南某地区页岩气储层典型地质条件,进行三维水力压裂数值模拟.模拟结果显示:该方法能够合理模拟高水压下压裂液在岩体中流动,岩体裂隙面萌生、扩展、贯通的完整破坏过程.最后,通过设计多组模型进行对比分析,探究注液速度、初始裂隙间距和长度对裂隙空间分布的影响,为实际工程的方案设计提供指导意见. |
| Author | 吴志军 甘亮 周原 刘泉声 |
| AuthorAffiliation | 武汉大学土木建筑工程学院,湖北武汉430072;岩土与结构工程安全湖北省重点实验室,湖北武汉430072 |
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| Author_FL | GAN Liang LIU Quansheng ZHOU Yuan WU Zhijun |
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| DocumentTitle_FL | Analysis of spatial distribution of cracks caused by hydraulic fracturing based on zero-thickness cohesive elements |
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| Keywords | 用户子程序 零厚度黏聚力单元 流固耦合 ABAQUS 水力压裂 |
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| Snippet | TE377; 作为页岩气开采关键技术,水力压裂在目标岩层产生大量裂隙,构成页岩气有效运输通道.因此,研究裂隙的空间分布和影响因素具有重要意义.采用连续-非连续方法,通... |
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| Title | 基于零厚度黏聚力单元的水力压裂裂隙空间分布影响分析 |
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