Preparation of the Tetrameric Poly(VS-St-BMA-BA) Nano-Plugging Agent and Its Plugging Mechanism in Water-Based Drilling Fluids.

Poly(VS-St-BMA-BA) showed a decreasing trend in AV before and after aging to different degrees, which is due to the fact that the poly(VS-St-BMA-BA) nano-plugging agent can increase the electric potential of clay particles and the thickness of hydration films, increase the inter-particle repulsion, and dismantle the drilling fluid in the inter-particle mesh structure of clay, which has a certain effect of viscosity reduction. 2.5.2 Plastic Viscosity Figure 6 shows the plastic viscosity (PV) change curve of drilling fluid.

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