摘要
文章为了分析页岩的水力压裂过程,制作了边长30 cm立方体试样,采用实验室大型实验设备,设置了不同的注射方向,对试样进行了水力压裂模拟实验。对比分析了试样的破坏形态,可以看出割缝注射方向对裂缝的发育有着重要影响;水力压裂的极限强度与裂纹和层面之间的夹角有一定的关系,当裂纹方向接近层面时,对应的水力压裂的强度较小;结合水力压裂的水压曲线,阐述了裂纹发育和压裂液压力之间的关系;分析了不同压力条件下页岩的水力压裂裂纹发育状态。该文结合工程提出了提高页岩体积改造的有效途径,对实际水力压裂有一定的指导意义。
For analyzing the shale hydrofracture process, shale rock was made into cube samples with a side length of 30 cm. By using large-scale laboratory equipment, hydrofracture tests on the samples in different kinds of injection directions were carried out. The comparative study of the failure modes of the samples shows that the injection direction has great influence on the crack development. The limit strength of shale hydrofracture has a correlation with the angle between crack and bedding plane. When the angle is smaller, the limit strength may be lower. Based on the hydraulic pressure curve, the relation between the crack development and hydraulic pressure was expounded. Crack development status of shale hydrofracture under different pressure conditions was analyzed. The effective ways to improve the shale volume reconstruction were put forward. The study has certain guiding significance for practical projects.
作者
张健
张国祥
李良
荆铁亚
马海春
ZHANG Jian;ZHANG Guoxiang;LI Liang;JING Tieya;MA Haichun(China Huaneng Group Clean Energy Technology Research Institute Co., Ltd., Beijing 102209, China;Huaneng International Power Development Corporation, Beijing 100031, China;School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China)
出处
《合肥工业大学学报（自然科学版）》
CAS
北大核心
2019年第4期541-545,共5页
Journal of Hefei University of Technology：Natural Science
基金
中国华能集团资助项目(CERI/TY-16-HJKO3)
关键词
页岩
水力压裂
模拟实验
水压
裂纹
shale
hydrofracture
simulation test
hydraulic pressure
fracture
