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Numerical Modeling on Hydraulic Fracturing in Coal-Rock Mass for Enhancing Gas Drainage
Joint Authors
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-16, 16 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-12-12
Country of Publication
Egypt
No. of Pages
16
Main Subjects
Abstract EN
The mechanism of how hydraulic fracturing influences gas drainage in coal-rock mass is still not clear due to its complex mechanism.
In this work, statistical distributions are firstly introduced to describe heterogeneity of coal-rock mass; a novel simultaneously coupled mathematical model, which can describe the fully coupled process including seepage-damage coupling during hydraulic fracturing process and subsequent gas flow during gas drainage process, is established; its numerical implementation procedure is coded into a Matlab program to calculate the damage variables, and it partly uses COMSOL solver to obtain numerical solutions of governing equations with damage-flow coupling; the mathematical model and its implementation are validated for initial damage pressure and mode of a single solid model without considering flow-damage coupling, as well as fracture initiation pressure and influence of heterogeneity on damage evolution of hydraulic fracturing considering flow-damage coupling; and finally, based on an engineering practice of hydraulic fracturing with two boreholes, the mechanism of how hydraulic fracturing influences gas drainage is investigated, numerical simulation results indicate that coal-rock mass pore-fissure structure has been improved, and there would exist a gas migration channel with characteristics of higher porosity and lower stresses, which demonstrates significant effects and mechanism of hydraulic fracturing on improving coal-rock permeability and enhancing gas drainage.
The research results provide a guide for operation of hydraulic fracturing and optimal layout of gas drainage boreholes.
American Psychological Association (APA)
Yuan, Zhigang& Shao, Yaohua. 2018. Numerical Modeling on Hydraulic Fracturing in Coal-Rock Mass for Enhancing Gas Drainage. Advances in Civil Engineering،Vol. 2018, no. 2018, pp.1-16.
https://search.emarefa.net/detail/BIM-1115393
Modern Language Association (MLA)
Yuan, Zhigang& Shao, Yaohua. Numerical Modeling on Hydraulic Fracturing in Coal-Rock Mass for Enhancing Gas Drainage. Advances in Civil Engineering No. 2018 (2018), pp.1-16.
https://search.emarefa.net/detail/BIM-1115393
American Medical Association (AMA)
Yuan, Zhigang& Shao, Yaohua. Numerical Modeling on Hydraulic Fracturing in Coal-Rock Mass for Enhancing Gas Drainage. Advances in Civil Engineering. 2018. Vol. 2018, no. 2018, pp.1-16.
https://search.emarefa.net/detail/BIM-1115393
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1115393