Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Pei Li; Dongmin Ma; Junyuan Zhang; Zhipeng Huo

doi:10.1002/ese3.552

journal article Open Access Nov 23, 2019

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

Pei Li

Dongmin Ma Junyuan Zhang Zhipeng Huo

Energy Science & Engineering Vol. 8 No. 3 pp. 804-816 · Wiley

View at Publisher Save 10.1002/ese3.552

Abstract

AbstractWettability modification of coal rock may cause serious change in the methane adsorption/desorption behaviors. Thus, the contact angle measurement and isothermal adsorption/desorption experiment of raw coal and samples treated with surfactants (STS) were conducted to investigate the wetting properties and methane adsorption/desorption characteristics. The results indicated that the long‐flame coal (LFC) has the good hydrophilicity itself, and there was no evident sign of saturated adsorption for different samples at relatively low‐pressure (<8 MPa) stage. The sample treated with the wettability reversal agent (G502) had the larger methane adsorption capacity than the wetted samples (LAS, JFC, and 6501), with the latter facilitating the methane desorption. Additionally, the adsorption capacity of the air‐dried samples was stronger than that of the water‐containing samples, including the moisture‐equilibrated, LAS, JFC, and 6501, reflecting that the better the hydrophilicity, the weaker the methane adsorption. Besides, the desorption hysteresis rate of the same sample was mainly controlled by pressure, i.e. the desorption hysteresis indicated a logarithmic decrease with the increasing pressure, but the STS clearly showed the desorption hysteresis to varying degree due to the wettability differences. The pressure drop in the low‐pressure stage was difficult to drive the adsorbed methane to immediately desorb from the matrix surface, whereas even caused further adsorption or re‐adsorption, meaning that the coal required a greater depressurization to enter the effective desorption stage. Finally, the positive implications of wettability modification including enhancing CBM recovery, as well as coal and methane outburst prevention and coal dust control in the mining industry were discussed.

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Details

Published: Nov 23, 2019
Vol/Issue: 8(3)
Pages: 804-816
License: View

Authors

P

Pei Li

School of Energy Resources China University of Geosciences Beijing China; Key Laboratory of Strategy Evaluation for Shale Gas Ministry of Natural Resources Beijing China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing China

D

Dongmin Ma

School of Geology and Environment Xi’an University of Science and Technology Xi’an China

J

Junyuan Zhang

School of Energy Resources China University of Geosciences Beijing China; Key Laboratory of Strategy Evaluation for Shale Gas Ministry of Natural Resources Beijing China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing China

Z

Zhipeng Huo

School of Energy Resources China University of Geosciences Beijing China; Key Laboratory of Strategy Evaluation for Shale Gas Ministry of Natural Resources Beijing China; Beijing Key Laboratory of Unconventional Natural Gas Geological Evaluation and Development Engineering Beijing China

Funding

National Natural Science Foundation of China Award: 41927801

China Scholarship Council Award: 201906400058

Cite This Article

Pei Li, Dongmin Ma, Junyuan Zhang, et al. (2019). Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China. Energy Science & Engineering, 8(3), 804-816. https://doi.org/10.1002/ese3.552

Wettability modification and its influence on methane adsorption/desorption: A case study in the Ordos Basin, China

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