Natural Gas Geoscience ›› 2019, Vol. 30 ›› Issue (10): 1415-1421.doi: 10.11764/j.issn.1672-1926.2019.06.004

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Desorption model considering gas⁃water distribution for coalbed methane reservoir

Ze-yang Peng(),Xiang-fang Li,Zheng Sun   

  1. Key Laboratory for Petroleum Engineering of the Ministry of Education, China University of Petroleum, Beijing 102249, China
  • Received:2019-02-27 Revised:2019-06-07 Online:2019-10-10 Published:2019-11-06

Abstract:

In order to clarify the influence of liquid in matrix pore of coal reservoir on desorption process, a capillary bundle model has been established based on matrix characteristics and coalification. From this model, the proportion of pore affected by liquid in matrix is obtained. Then, Langmuir adsorption theory of solid-gas interface and solid-liquid interface theory are used to obtain different water conditions in matrix. The result shows that the existence of liquid water will greatly reduce the desorption capacity of coal reservoir, which is attributed to the existence of liquid water. On one hand, liquid will affect the gas desorption volume by affecting the proportion of solid-liquid interface desorption; on the other hand, liquid will trap the desorbed gas in micro-nano pore by forming capillary force. The research results lay a foundation for perfecting the theory of desorption and development of coalbed methane and optimizing the policy of development technology.

Key words: Desorption curve, CBM, Distribution of gas and water, Capillary force

CLC Number: 

  • TE32

Fig.1

Characteristics of gas and water in coalification"

Fig.2

Characteristics of gas migrating"

Fig.3

Figure of capillary bundle model"

Fig.4

Force analysis of stable bubble"

Fig.5

IMI adsorption and desorption testing instrument"

Fig.6

Adsorption curve and model results in 1.5MPa inject"

Fig.7

Adsorption curve and model results in 7.2MPa inject"

Fig.8

Adsorption curve and model results in 14.5MPa inject"

Fig.9

Adsorption/desorption curve in different saturation"

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