... graded proppant injection has been proposed in the industry to increase the size of the stimulated zone in naturally fractured reservoirs, especially CBM. However, big discrepancies between the modelling results of graded proppant injection and the experimental results have been observed. An analytical...

... fracture permeability value particle graded proppant injection proppant placement Keshavarz effective stress injection Introduction Permeability decreases during the production stage in stress-sensitive, naturally fractured rocks such as found in coalbed methane and shale gas reservoirs...

... model developed describes the proppant-free water injection stage, the capture kinetics of proppant particles in the natural fractures and the change in well index due to graded proppant injection. Computational fluid dynamics and classical Hertz theory have been used to determine the hydraulic...