Experimental investigation on dynamic and static Biot coefficients of transversely isotropic shale

被引：0
|
作者：
Jia L. [1 ]
机构：
[1] Drilling and Production Technology Research Institute, CNPC Chuanqing Drilling Engineering Company Limited, Sichuan, Guanghan
来源：
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷
关键词：
Biot coefficient; elastic stiffness coefficient; rock mechanics; transverse isotropic shale; triaxial compression test; wave velocity;
D O I：
10.13722/j.cnki.jrme.2022.1143
中图分类号：
学科分类号：
摘要：
It is practically important for geomechanical modeling and wellbore stability analysis to obtain Biot coefficient of transverse isotropic shale accurately and efficiently. The dynamic and static Biot coefficient and elastic stiffness coefficient of marine-facies Longmaxi black shale in the South Sichuan Basin are investigated by using acoustic measurement and conventional triaxial compression in this study. The main results are as follows：The dynamic and static elastic stiffness coefficients，Young's modulus both increase with confining pressure，and the dynamic value is higher than the corresponding static value. The value of Young's modulus parallel to bedding is higher than that of perpendicular to bedding. However，the dynamic and static Poisson's ratio has no significant rule with the increase of confining pressure and the change of bedding. In addition，the dynamic and static Biot coefficients decrease with confining pressure. And the Biot coefficients perpendicular to bedding are higher than those parallel to bedding. On the other hand，the static Biot coefficients are higher than the dynamic results. Finally the fitting analysis shows that there is a linear conversion relationship between dynamic and static Biot coefficients and Young's modulus，respectively. The obtained anisotropic characteristics of Biot coefficient and the dynamic to static conversion relationship play an indispensable role in the geomechanical analysis in drilling and completion of shale. © 2023 Academia Sinica. All rights reserved.
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页码：4130 / 4139
页数：9
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