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Energies 2017, 10(6), 775; doi:10.3390/en10060775

Influence of Stratigraphic Conditions on the Deformation Characteristics of Oil/Gas Wells Piercing Longwall Pillars and Mining Optimization

1
School of Mines, Key Laboratory of Deep Coal Resource Mining, Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China
2
EMS Energy Institute, G3 Center and Energy and Mineral Engineering, Pennsylvania State University, University Park, State College, PA 16802, USA
3
Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
*
Author to whom correspondence should be addressed.
Academic Editor: Mofazzal Hossain
Received: 18 April 2017 / Revised: 26 May 2017 / Accepted: 31 May 2017 / Published: 3 June 2017
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Abstract

Hydrocarbon wells drilled vertically through longwall coal pillars are vulnerable to severe deformation and potential failure as a result of underground coal mining. The lithology of the host rocks play a critical role in well stability. In this study, a two dimensional finite element method is employed to investigate the horizontal shear offset, vertical delamination, and compression at the weak interface between neighboring soft and stiff layers after the sequential extraction of longwall panels flanking the protective coal pillar. The influence of stratigraphic conditions, including the single rock layer thickness (SRLT), seam mining height (SMH), and seam dip angle (SDA), on deformation of hydrocarbon wells is explored. An optimization of mining sequence along strike and for panel advance direction along dip is also performed. Finally, some recommendations regarding coal mining and peripheral support measures are suggested. View Full-Text
Keywords: hydrocarbon wells; rock layer thickness; seam mining height; seam dip angle; well stability; longwall mining hydrocarbon wells; rock layer thickness; seam mining height; seam dip angle; well stability; longwall mining
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Liang, S.; Elsworth, D.; Fu, X.; Li, X.; Yao, Q. Influence of Stratigraphic Conditions on the Deformation Characteristics of Oil/Gas Wells Piercing Longwall Pillars and Mining Optimization. Energies 2017, 10, 775.

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