Technology processes of enhancement of broken soft and low permeability coal reservoir and surface development of coalbed methane - Shuxun SANG; Fansheng HUANG; Yansheng SHAN; Xiaozhi ZHOU; Shiqi LIU; Sijie HAN; Sijian ZHENG; Tong LIU; Ziliang WANG; Fengbin WANG (Meitan kexue jishu, 2024)