Abstract
Due to strong inhibitive ability, oil-based drilling fluid system was often the first choice of drilling fluids in the drilling operation of shale plays. However, borehole instability problems tend to occur most frequently in the drilling operation of horizontal well intervals. So the sealing mechanism of shale formation was of great importance to wellbore stability. Sealing effect of colloid particles, bridging and blocking effect of skeleton particles, plugging function of deformable particles and isolation effect of polymer were analysed, and multicomponent collaborative plugging mechanism was investigated. The results indicated that it could play an important role in plugging micropores and microfractures on shale surface to form a blocking layer with ultra-low permeability. This study can be helpful for the design of novel plugging agents for drilling fluids, and endow with economically and technically viable petroleum development and production.
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