Application of orthogonal dipole shear wave in the research of formation stress

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Wang, GongJun^1 ; Wang, DongMei^2

Yangtze University College of Technology and Engineering, jingzhou HUBEI Province

434020, China^1

Jingzhou Institute of Technology, jingzhou HUBEI Province

434020, China^2

关键词: Anisotropy coefficients;    Borehole stability;    Fracture pressures;    Isotropic medium;    Orthogonal dipoles;    Shear wave velocity;    Transversely isotropic;    Transversely isotropic medium;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/3/032065/pdf
DOI  :  10.1088/1755-1315/189/3/032065

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In the formation stress research, the formation may be regarded as the transversely isotropic medium. The main research is horizontal direction two stresses, namely maximum and minimum stress. The orthogonal dipole shear wave logging was gained, which made it convenient to calculate the stress. This article quotes the elastic modulus and the stress relations, which derived the transversely isotropic formation stresses formula. The formation fracture pressure and the borehole stability expression were gained based on the fracture pressure elementary theory. At the same time it has also calculated many parameters such as the elastic modulus, anisotropy coefficient and so on. The orthogonal dipole shear wave logging was analyzed, which indicated that there is no need to consider formation tectonic factor. When calculating maximum and minimum stress was same based on fast and slow shear wave velocity was same, which reflected the formation assumed the isotropic. When they have the difference, it is showed that the formation assumes the anisotropy. Commonly-used the isotropic medium is one kind of the transversely isotropic medium.