泵流量对纵向切槽水力压裂裂缝偏转的影响规律研究  

Influence of Pump Flow to Fracture Gauche of Hydraulic Fracturing with Cutting along Bore Direction

作　　者：徐成 林健[1,2] 王洋[1,2] 石垚[1,2] 杨建威[1,2] XU Cheng;LIN Jian;WANG Yang;SHI Yao;YANG Jian-wei(Coal Mining & Designing Department,Tiandi Science & Technology Co.,Ltd.,Beijing 100013,China;Mining Institute,China Coal Research Institute,Beijing 100013,China)

机构地区：[1]煤炭科学研究总院开采研究分院,北京100013 [2]天地科技股份有限公司开采设计事业部,北京100013

出　　处：《煤矿开采》2019年第1期11-15,共5页Coal Mining Technology

基　　金：国家重点研发计划(2017YFC0603003);中煤科工集团科技创新创业基金(2018MS021);煤炭科学研究总院科技创新基金项目(2016ZYMS011)

摘　　要：采用ABAQUS软件,建立了纵向切槽水力压裂裂缝扩展的有限元二维模型,分析了不同泵流量条件下纵向切槽水力压裂裂缝扩展规律。研究表明:裂缝开裂初期,受地应力差的影响,裂缝很快转向最大主应力方向;随着泵流量的大幅增加,裂缝的偏转情况得到减缓,曲率半径增大,偏转距明显增加,流量在120L/min以内时,增长速度较快;目前常用注水泵流量为90L/min,其裂缝偏转距为4.05m。结论对于实际的钻孔距设计和注水泵选取具有参考意义。The finite element tow dimensional model of fracture expanding of hydraulic fracturing with cutting along bore direction was built with ABAQUS software,and then fracture expanding principle under different pump flow were analyzed.The results showed that the fracture direction rapidly turn to the major principal stress orientation at the beginning under influence of crustal stress difference,with pump flow increased largely,and then fracture gauche situation was slowed down,and curvature radius increased,gauche moment increased obviously,it increased rapidly as flow within 120L/min,the gauche moment reached 4.05m under the normal pump flow 90L/min,and the conclusions referenced for drilling distance design and pump selection.

关 键 词：纵向切槽 泵流量 定向水力压裂 偏转距 扩展路径 

分 类 号：TD32[矿业工程—矿井建设]