Abstract
In this study, an induced fracture model and Lower Silurian Longmaxi Formation shale were used to study the effects of retained fracturing fluid on production. The results reveal that permeability will decrease first after contacted with fracturing fluid, then it will recover with increasing immersion time. The major reason for permeability recovery is that induced fractures is formation because of internal pressure of pores higher than initiation pressure. A lot of natural fracture and induced fractures interconnected each other and form network cracks to provide channels for gas. Therefore, prolonging the shut-in time of shale reservoir after fracturing can improve the gas production.
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