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Measuring the gas content of coal: a review.

Authors
Diamond-WP; Schatzel-SJ
Source
Int J Coal Geol 1998 Feb; 35(1-4):311-331
NIOSHTIC No.
20032421
Abstract
Coalbed gas content measurements are commonly used in mine safety as well as coalbed methane resource assessment and recovery applications. Gas content determination techniques generally fall into two categories: (1) direct methods which actually measure the volume of gas released from a coal sample sealed into a desorption canister and (2) indirect methods based on empirical correlations, or laboratory derived sorption isotherm gas storage capacity data. Direct gas content determination techniques may be further subdivided into quick-crushing and extended desorption methods. The quick-crushing methods are primarily used in mine safety applications outside the United States, but have also been used for resource recovery applications. Quick-crushing methods rely on crushing the coal sample soon after collection to release all the desorbable gas, thus significantly shortening the amount of time required for desorption measurements. However, some data useful for resource recovery applications are lost. Extended desorption techniques are most commonly used for resource assessment and recovery applications where information on desorption rates is useful for reservoir modeling, and for fundamental coalbed methane research. Extended desorption methods allow the gases in the coal sample to desorb under controlled laboratory conditions until a defined low desorption rate cutoff point is reached. The sample may then be crushed to measure the amount of gas remaining within the sample. Direct method techniques for gas content measurement are the focus of this paper.
Keywords
Mining-industry; Underground-mining; Methanes; Mine-gases; Analytical-processes; Analytical-instruments; Coal-mining; Analytical-methods
Contact
National Institute for Occupational Safety and Health, Pittsburgh Research Center, P.O. Box 18070, Pittsburgh, PA 15236-0070, USA
CODEN
IJCGDE
CAS No.
74-82-8
Publication Date
19980201
Document Type
Journal Article
Fiscal Year
1998
NTIS Accession No.
NTIS Price
Issue of Publication
1-4
ISSN
0166-5162
NIOSH Division
PRL
Source Name
International Journal of Coal Geology
State
PA
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