1/1/2024 0 Comments Imposition studio 4.5 crackLi N, Tao RH, Fu YH, He YT, Dong HZ, Liu XX (2019) Field application of nitrogen power hole making technology in well Ping 3 of Fenshi 71. Li JH, Li BB, Cheng QY, Gao Z (2021) Characterization of anisotropic coal permeability with the effect of sorption-induced deformation and stress. Li XH, Lu YU, Zhao Y et al (2008) Study on improving the permeability of soft coal seam with high pressure pulsed water jet. Journal of Rock Mechanics and Geotechnical Engineering 11(04):770–778 Jayasinghe B, Zhao ZY, Chee AGT, Zhou HY, Gui YL (2019) Attenuation of rock blasting induced ground vibration in rock-soil interface. Electrical Insulation Magazine IEEE 16(3):19–25 Inoue H, Lisitsyn IV, Akiyama H et al (2000) Drilling of hard rocks by pulsed power. Huang BX (2010) Research on theory and application of hydraulic fracture weakening for coal-rock mass. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 25(05):327–330 Harpalani S (1988) Specimen preparation for testing coal properties. China Petroleum Exploration 24(3):397–402 Guo ZD, Zeng WT, Fang HJ et al (2019) Initial application of intense repeated pulse wave for stimulating CBM reservoirs. Taiyuan: Taiyuan University of TechnologyĬheng B, Fan ZX, He XN (2020) Technology and practice of enhanced seepage enhancement in driving face of high gas coal seam based on hydraulic cutting. China Coalbed Methane 7(06):24–26īian DC (2018) Research on the shock wave characteristics of pulsed discharge under hydrostatic pressure and its fracturing effect on rock mass. This research provides an experimental foundation for the enhancement of coal bed permeability through the application of repetitive strong shock waves.īai JM, Cheng H, Zu SQ et al (2010) Discussion on feasibility of enhancing production of low-production CBM wells by using powerful pulse techniques. The permeability of coal mass was enhanced after shock waves were applied. The research results demonstrated that, within the impact range of shock waves, coal mass damage, and mechanical fragmentation were clearly apparent. Furthermore, computed tomography (CT) scanning technology was applied to determine the mechanism underlying the internal changes of coal samples after the application of shock waves. The characteristics of variation of the permeability of coal samples before and after the loading of shock waves were also investigated to establish a quantitative relationship between the number of shocks and permeability. This study analyzed the patterns of crack development on different scales of coal samples subjected to shock waves. The mechanism of permeability enhancement owing to the scale effect of the medium in reservoirs has yet to be elucidated. However, the development of cracks in dense coal beds results in a multi-scale effect on the porosity of coal rock. The application of repetitive strong shock waves to enhance the permeability of coal beds is a frontier research field in recent years.
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