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Research Papers: Petroleum Engineering

Quantification of Gas and Water Transfer Between Coal Matrix and Cleat Network During Drainage Process

[+] Author and Article Information
Mingjun Zou

School of Resource and Environment,
North China University of Water Resources and
Electric Power,
Zhengzhou 450045, China
e-mail: zoumingjun2008@163.com

Chongtao Wei

School of Resource and Earth Science,
China University of Mining & Technology,
Xuzhou 221116, China
e-mail: weighct@163.com

Miao Zhang

He’nan Province Research Institute of
Coal Geological Prospecting,
Zhengzhou 450052, China
e-mail: zhangmiaoms@163.com

Xiaochun Lv

School of Resource and Environment,
North China University of Water Resources and
Electric Power,
Zhengzhou 450045, China
e-mail: xc66995618@163.com

1Corresponding author.

Contributed by the Petroleum Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received October 8, 2016; final manuscript received September 17, 2017; published online October 17, 2017. Assoc. Editor: Daoyong (Tony) Yang.

J. Energy Resour. Technol 140(3), 032905 (Oct 17, 2017) (9 pages) Paper No: JERT-16-1400; doi: 10.1115/1.4038044 History: Received October 08, 2016; Revised September 17, 2017

Mathematical models were developed in this study to quantify the gas and water transfer between coal matrix and cleat network during coalbed methane (CBM) drainage, which can be helpful to achieve some useful findings on features of fluid migration within coal reservoirs during drainage process. A typical CBM well located at southern Qinshui basin of China was selected as the case study. The ineffective critical porosity was defined and was used to acquire fluid transfer as a key parameter of the established model. Results showed that both the gas and water transfer controlled the drainage performances. Water drained from cleat was found to be the main reason for the decrease in the reservoir pressure at the early drainage stage, while the water transfer became significantly more important with the continuation of the drainage process. The first peak of gas production was controlled by gas desorption, and the subsequent peaks were influenced by the gas transfer.

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Figures

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Fig. 1

Drainage curves of well QSCBM01

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Fig. 2

Sensitivity analyzes for the permeation pore system (left: permeability; right: porosity)

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Fig. 3

Sensitivity analyzes for the cleat system (left: permeability; right: porosity)

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Fig. 4

Impact of permeability on ineffective critical porosity under permeabilities of (a) 0.01, (b) 0.1, (c) 1, and (d) 5 mD

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Fig. 5

Impact of irreducible water saturation on ineffective critical porosity under irreducible water saturations of (a) 20, (b) 40, (c) 60, and (d) 80%

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Fig. 6

Curves of gas production prediction by using TPDP model

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Fig. 7

Curves of water production prediction by using TPDP model

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Fig. 8

Curves of water production prediction by using DPSP model

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Fig. 9

Water transfer between matrix and cleat systems

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Fig. 10

Curves of gas production prediction by using DPSP model

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Fig. 11

Gas desorption rate during CBM drainage process

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Fig. 12

Gas transfer between matrix and cleat systems

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