Research status and development trend of acidification and permeability improvement technology for low-permeability coal seam

Shaochuan Chen, China University of Mining and Technology (Beijing), School of Emergency Management and Safety Engineering, Beijing, China
Yun Lei, China University of Mining and Technology (Beijing), School of Emergency Management and Safety Engineering, Beijing, China
Fuchao Tian, China University of Mining and Technology (Beijing), School of Emergency Management and Safety Engineering, Beijing, ChinaFollow
Jie Kang, Liaoning Technical University, School of Safety Science and Engineering, Huludao, Liaoning, China

Author ORCID Identifier

Fuchao Tian: 0000-0002-7343-1448

Shaochuan Chen: 0009-0005-6614-2663

Yun Lei: 0009-0009-5558-9370

Jie Kang: 0009-0004-8129-2806

Abstract

Low-permeability coal seams in China are often characterized by mineral-clogged pore-fracture systems, severely limiting coalbed methane (CBM) extraction efficiency. Acidification technology, which involves injecting acidic solutions into coal seams to dissolve minerals and enhance permeability, has emerged as a promising approach. This paper systematically reviews the mechanisms, laboratory findings, and field applications of acidification technology for permeability enhancement in low-permeability coal seams. Key findings include significant improvements in pore connectivity, reductions in gas adsorption capacity, and enhanced gas extraction rates post-acidification. Field tests demonstrate that acid fracturing can increase gas extraction volume by 4-7 times. The study also identifies current challenges – such as acid-rock reaction control, environmental concerns, and limited penetration depth – and proposes future directions, including hybrid acid systems, AI-integrated process optimization, and environmentally friendly alternatives. This review provides a theoretical foundation and practical guidance for the application of acidizing technology in CBM extraction.

Recommended Citation

Chen, Shaochuan; Lei, Yun; Tian, Fuchao; and Kang, Jie (2026) "Research status and development trend of acidification and permeability improvement technology for low-permeability coal seam," Journal of Sustainable Mining: Vol. 25 : Iss. 2 , Article 4.
Available at: https://doi.org/10.46873/2300-3960.1490