The coalbed methane material balanced equation based on the compound desorption

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  • State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China

Received date: 2015-09-25

  Revised date: 2016-01-05

  Online published: 2019-09-19

Abstract

By analyzing CBM(coalbed methane) desorption behavior,the compound desorption process was described.Since some CBM reservoirs have initial free gas,the A persuade pressure MBE(material balance equation) is established according to the H persuade pressure MBE.The difference between A and H persuade pressure is desorption gas volume.Meanwhile,another CBM MBE is established to forecast the CBM production behavior without the initial free gas based on the King’s method.The case calculation shows that the regression line passes the origin point,which indicates that this reservoir has no initial free gas.And the slope of the regression line with the compound desorption is smaller than the gas desorption,which shows the compound desorption will influence more on the production.The compound desorption can reduce the recoverable reserve of the coalbed methane.

Cite this article

Zhu Su-yang, Du Zhi-min, Li Chuan-liang, Peng Xiao-long . The coalbed methane material balanced equation based on the compound desorption[J]. Natural Gas Geoscience, 2016 , 27(6) : 1128 -1133 . DOI: 10.11764/j.issn.1672-1926.2016.06.1128

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