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A program to calculate the state of stress in the vicinity of an inclined borehole through an anisotropic rock formation

Li Wei, Douglas R. Schmitt, Maria Tibbo and Zou Changchun
A program to calculate the state of stress in the vicinity of an inclined borehole through an anisotropic rock formation
Geophysics (August 2019) 84 (5): F103-F118

Abstract

A borehole existing in any geologic formation concentrates the far-field tectonic and overburden stresses amplifying the magnitudes of certain stress components near the borehole. It is important to understand the magnitudes and patterns of this stress concentration because these lead to damage and can even collapse the borehole if sufficiently strong. The solution of the stress distributed near a borehole can be complicated considering the elastic anisotropy of rocks. We have developed programs (ASCIB3D) in MATLAB and Python to model the stress distribution around an inclined borehole in an arbitrarily oriented anisotropic medium. The program is built on the Lekhnitskij-Amadei solution. The input orientation of the far-field stresses and the elastic stiffness matrix of the medium into the program are geology angles instead of the rotation angles shown in previous studies, making the code more convenient for users. The sign convention for the inverse function, which is ignored in previous studies, is discussed in detail. The results indicate that the program ASCIB3D is a useful tool for modeling the stress distributed around an inclined borehole in the anisotropic formation and analyzing the effect of anisotropy and borehole inclination on stress distribution. The inclination and azimuth of the borehole and the anisotropy of the rocks affect the orientation and strength of the stress concentration.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 84
Serial Issue: 5
Title: A program to calculate the state of stress in the vicinity of an inclined borehole through an anisotropic rock formation
Affiliation: Southwest Petroleum University, Chengdu, China
Pages: F103-F118
Published: 20190808
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 66
Accession Number: 2019-092910
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendices
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: University of Alberta, CAN, CanadaUniversity of Toronto, CAN, CanadaChina University of Geosciences, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201949
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