Izvestiya of Saratov University.

Earth Sciences

ISSN 1819-7663 (Print)
ISSN 2542-1921 (Online)

For citation:

Khassanov D. I., Lonshakov M. A. Evaluation of fault reactivation risks during drilling of the horizontal well using results of one-dimensional geomechanical modeling. Izvestiya of Saratov University. Earth Sciences, 2024, vol. 24, iss. 3, pp. 172-183. DOI: 10.18500/1819-7663-2024-24-3-172-183, EDN: MERWJG

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
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Language: 
Russian
Heading: 
Geology
Article type: 
Article
UDC: 
550.832:622.24.001
DOI: 
10.18500/1819-7663-2024-24-3-172-183
EDN: 
MERWJG

Evaluation of fault reactivation risks during drilling of the horizontal well using results of one-dimensional geomechanical modeling

Autors: 
Khassanov Damir Irekovich, Kazan Federal University
Lonshakov Marat Andreevich, Kazan Federal University
Abstract: 

The article presents main factors affecting the fault stability. Concepts of critically stressed faults and critical pore pressure are discussed. The methodologies for evaluation of stressed-deformed state of rocks in the vicinity of fault zones during reservoir depletion and injection, well drilling are analyzed. 1D geomechanical models of fishbone sidetracks and main borehole of the well N are constructed. The fault stability evaluation is made using Mohr – Coulomb failure criterion from data of in situ stresses and near-wellbore stresses calculated from Kirsch wellbore solution. Optimal mud weight ranges are determined for safe drilling of fishbone boreholes accounting fault reactivation risks. Basic recommendations for optimal drilling through the interval of unstable shales are made.

Key words: 
fault stability
Mohr – Coulomb failure criterion
fault reactivation
1D geomechanical model
wellbore stability
safe mud weight window
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Received: 
18.04.2024
Accepted: 
08.08.2024
Published: 
30.09.2024