Encyclopedia of Mineral and Energy Policy

Living Edition
| Editors: Günter Tiess, Tapan Majumder, Peter Cameron

Coal, Desorption

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DOI: https://doi.org/10.1007/978-3-642-40871-7_105-1
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Desorption is a process opposite to adsorption. Methane is stored through adsorption within micropores in coal matrix with increasing pressure in a coal bed. In the reverse way, with reduction in reservoir pressure, the adsorbed gas is released from the micropores and it migrates through coal matrix – a process called diffusion – to reach to drainage path defined by coal macropore system. This phenomenon is known as desorption (Harpalani and Schraufnagel 1990a, b; Crosdale et al. 1998).

During CBM exploration, various investigations and tests are generally carried out in order to evaluate potentiality of an area before implementation of commercial production of methane gas. Of these very significant one is desorption testwhich is carried out during test drilling. Desorption test is a device of measuring gas content of a coal based on the principle of desorption phenomenon and is a direct method of gas measurement. There are many indirect methods to estimate gas content of a coal...

Keywords

Reservoir Pressure Core Sample Drill Hole Coal Sample Coal Matrix 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

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© Springer-Verlag GmbH Germany 2016

Authors and Affiliations

  1. 1.Geological Survey of India (GSI)KolkataIndia