Journal article

Effect of coal maturity on CO2-based hydraulic fracturing process in coal seam gas reservoirs

KHSM Sampath, MSA Perera, D Elsworth, PG Ranjith, SK Matthai, T Rathnaweera, G Zhang

FUEL | ELSEVIER SCI LTD | Published : 2019


Hydraulic fracturing of deep coal seams is challenging due to both the complex processes involved in fracturing and the typically poorly defined characteristics such as natural cleat system, mineral-maceral distribution and strength parameters of the subsurface. This study evaluates the effectiveness of fracturing using liquid CO2 as the propellant through observations of break-down pressures and the form of the induced fracture network in various ranked coals. Coal ranks are defined through a rigorous proximate analysis to determine the moisture, volatile matter, ash and fixed carbon contents of each coal type fractured. Fracturing experiments were conducted on 38 mm × 76 mm core samples, u..

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