Mathematical Model of Desorption Curve and Desorption Gas Content Test Method for Low-rank Coal Samples

The gas content and desorption rate of coal reservoir have important influence on the high and stable production of CBM well. In order to quantitatively evaluate the desorption rate of coal samples, and to reduce the test time of desorption gas content, this paper builds a quantitative relationship...

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Bibliographic Details
Published inMei kuang an quan Vol. 51; no. 7; pp. 12 - 16
Main Author WANG Lei, LYU Yahui, WANG Cong
Format Journal Article
LanguageChinese
Published Editorial Office of Safety in Coal Mines 01.07.2020
Subjects
desorption curve
desorption gas content
desorption rate
low coal rank
mathematic model
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Summary:The gas content and desorption rate of coal reservoir have important influence on the high and stable production of CBM well. In order to quantitatively evaluate the desorption rate of coal samples, and to reduce the test time of desorption gas content, this paper builds a quantitative relationship between absorption rate and desorption time based on desorption experiment data of coal samples from Jiergalangtu Sag of Erlian Basin. And the quantitative relationship between desorption time and cumulative desorption gas content is established, based on this, a new desorption gas testing methods is proposed also. The results show that the desorption rate of coal sample decreases with the increase of desorption time. The larger the initial desorption rate value, the smaller the desorption rate, the larger the desorption rate of coal formation. The desorption curve of coal sample can be quantitatively characterized by formula.
ISSN:1003-496X
DOI:10.13347/j.cnki.mkaq.2020.07.003