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Evaluation of the relative importance of coalbed reservoir parameters for prediction of methane inflow rates during mining of longwall development entries.

Authors
Karacan-CÍ
Source
Comput Geosci 2008 Sep; 34(9):1093-1114
NIOSHTIC No.
20034304
Abstract
This study presents a reservoir modeling approach to investigate the relative effects of different coalbed parameters on the migration of methane into development entries. A base coalbed reservoir model of a three-entry development section, where grids were dynamically controlled to simulate the advance of mining at a constant section advance rate, was created and calibrated for a Pittsburgh Coalbed mine in the Southwestern Pennsylvania section of the Northern Appalachian Basin. The values of coalbed parameters were varied to evaluate their effects on predicted methane emissions for various development distances. The results of these parametric simulations were then used to derive linear expressions relating these parameters to methane emissions into the workings. These models were analyzed to assess their significance and adequacy for predictive purposes. This work shows that coupling reservoir simulations with linear modeling yield a technique that can be applicable to different coalbeds. The reservoir parameters used by the linear models (coalbed thickness, pressure, sorption time constant, Langmuir parameters, permeability) can be determined by running relatively simple laboratory tests, such as adsorption equilibrium and permeability determination, on coal samples obtained either from the mining operation or from the exploratory boreholes drilled ahead of mining.
Keywords
Computer-models; Mathematical-models; Models; Risk-analysis; Risk-factors; Work-areas; Work-environment; Workplace-studies; Safety-education; Safety-engineering; Safety-measures; Safety-practices; Safety-programs; Safety-research; Coal-mining; Coal-processing; Mine-gases
Contact
CO Karacan, Pittsburgh Research Laboratory, National Institute for Occupational Safety and Health, Pittsburgh, PA 15236,
CODEN
CGEODT
Publication Date
20080901
Document Type
Journal Article
Email Address
cok6@cdc.gov
Fiscal Year
2008
NTIS Accession No.
NTIS Price
Issue of Publication
9
ISSN
0098-3004
NIOSH Division
PRL
Source Name
Computers & Geosciences
State
PA
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