Discussion on underground system sealing methods in in-situ pyrolysis exploitation of tar-rich coal

Authors

GUO Wei, College of Construction Engineering, Jilin University, Changchun 130026, China; National-LocalJoint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130026, China; Cooperative Innovation Center of Exploration and Development of Shale Oil and Gas Resources, Ministry of Education & Jilin Province, Changchun 130026, China; Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Changchun 130026, ChinaFollow
LIU Zhao, College of Construction Engineering, Jilin University, Changchun 130026, China; National-LocalJoint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130026, China; Cooperative Innovation Center of Exploration and Development of Shale Oil and Gas Resources, Ministry of Education & Jilin Province, Changchun 130026, China; Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Changchun 130026, ChinaFollow
SUN Youhong, National-LocalJoint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130026, China; Cooperative Innovation Center of Exploration and Development of Shale Oil and Gas Resources, Ministry of Education & Jilin Province, Changchun 130026, China; Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Changchun 130026, China; School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
LI Qiang, College of Construction Engineering, Jilin University, Changchun 130026, China; National-LocalJoint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130026, China; Cooperative Innovation Center of Exploration and Development of Shale Oil and Gas Resources, Ministry of Education & Jilin Province, Changchun 130026, China; Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Changchun 130026, China
DENG Sunhua, College of Construction Engineering, Jilin University, Changchun 130026, China; National-LocalJoint Engineering Laboratory of In-situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130026, China; Cooperative Innovation Center of Exploration and Development of Shale Oil and Gas Resources, Ministry of Education & Jilin Province, Changchun 130026, China; Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions, Changchun 130026, China

Abstract

China has abundant tar-rich coal resource, in-situ underground pyrolysis is the main trend of green and efficient development of tar-rich coal resources. However, the underground in-situ pyrolysis of tar-rich coal is still in the stage of technology research and development, and it is necessary to focus on the key technology of tar-rich coal to carry out research . Underground system sealing is one of the key technologies to ensure the efficient use of energy and ecological protection of tar-rich coal in-situ pyrolysis mining, and there is an urgent need to develop and construct underground system closure technology suitable for the characteristics of tar-rich coal in-situ pyrolysis development. Based on the current status of research and application of underground system sealing technology, the principles, advantages and disadvantages of various types of underground system sealing technologies such as underground artificial freezing, grouting curtain, water-stopping by gas flooding and foam water-stopping, etc. were systematically sorted out and summarized, and the stratigraphic adaptability of various technologies weas analyzed in depth. The applicability of different system sealing technologies in the development of tar-rich coal pyrolysis is analyzed in the context of geological characteristics such as burial depth, layer thickness and regional tectonics of tar-rich coal seam, as well as the pyrolysis development process and scale. Further, the development trend of system sealing technology is discussed, i.e., innovating of existing technical principles and development of composite sealing technology. For the engineering implementation of underground system sealing technology, a systematic approach including design-monitoring-repair and environment restoration of underground system sealing is proposed around the fine design before development, strict monitoring during development and safe restoration after development. Finally, an integrated technology concept of underground in-situ pyrolysis exploitation of tar-rich coal and CO₂ geological storage was proposed by integrating the key technologies such as in-situ pyrolysis, underground system sealing, product displacement and CO₂ geological storage, which provided references for the development and industrial application of in-situ pyrolysis exploitation technology of tar-rich coal in China.

Keywords

in-situ pyrolysis, system sealing, ground adaptability, CO2 geological storage, integrated exploitation technology, tar-rich coal

DOI

10.12363/issn.1001-1986.22.12.0941

Recommended Citation

GUO Wei, LIU Zhao, SUN Youhong, et al. (2023) "Discussion on underground system sealing methods in in-situ pyrolysis exploitation of tar-rich coal," Coal Geology & Exploration: Vol. 51: Iss. 1, Article 13.
DOI: 10.12363/issn.1001-1986.22.12.0941
Available at: https://cge.researchcommons.org/journal/vol51/iss1/13

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