Laboratory Study on Changes in the Pore Structures and Gas Desorption Properties of Intact and Tectonic Coals after Supercritical CO 2 Treatment: Implications for Coalbed Methane Recovery

Erlei Su, Yunpei Liang, Lei Li, Quanle Zou and Fanfan Niu
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Erlei Su: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Yunpei Liang: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Lei Li: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Quanle Zou: State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
Fanfan Niu: Zhengzhou Engineering Co., Ltd. of China Railway Seventh Group, Zhengzhou 450052, China

Energies, 2018, vol. 11, issue 12, 1-13

Abstract: Tectonic coals in coal seams may affect the process of enhanced coalbed methane recovery with CO 2 sequestration (CO 2 -ECBM). The main objective of this study was to investigate the differences between supercritical CO 2 (ScCO 2 ) and intact and tectonic coals to determine how the ScCO 2 changes the coal’s properties. More specifically, the changes in the tectonic coal’s pore structures and its gas desorption behavior were of particular interest. In this work, mercury intrusion porosimetry, N 2 (77 K) adsorption, and methane desorption experiments were used to identify the difference in pore structures and gas desorption properties between and intact and tectonic coals after ScCO 2 treatment. The experimental results indicate that the total pore volume, specific surface area, and pore connectivity of tectonic coal increased more than intact coal after ScCO 2 treatment, indicating that ScCO 2 had the greatest influence on the pore structure of the tectonic coal. Additionally, ScCO 2 treatment enhanced the diffusivity of tectonic coal more than that of intact coal. This verified the pore structure experimental results. A simplified illustration of the methane migration before and after ScCO 2 treatment was proposed to analyze the influence of ScCO 2 on the tectonic coal reservoir’s CBM. Hence, the results of this study may provide new insights into CO 2 -ECBM in tectonic coal reservoirs.

Keywords: supercritical CO 2; tectonic coal; pore structure; methane desorption (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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