Abstract
Promoting fracture development of deep low-permeability coal seams is one of the necessary means to improve the efficiency of coalbed methane extraction. Organic solvent erosion is an efficient method to promote fracture and pore development in coal. However, the law of fracture and pore development in the process of solvent erosion has not been clarified yet. In this study, the law was discussed from four aspects, namely macro-fracture, micro-fracture, internal fracture and pore. The results show that organic solvent treatment is pretty effective in promoting the fracture and pore development. After solvent treatment, soluble molecules dissolve in the solvent and separate from coal to form the extract. Through the removal of soluble molecules, primary fractures and pores widen, and new fractures and pores develop in large numbers. Then, part of the insoluble coal becomes broken and falls off, forming the abscission. Different solvents exert varying effects which are related to their extraction rates on coal. Under a high extraction rate, secondary fractures are distributed around the main fractures, and fractures are interconnected to form a complex fracture network. Finally, the effects of organic solvents erosion on coal were classified.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
