Insights into the Injectivity and Propagation Behavior of Preformed Particle Gel (PPG) in a Low-Medium-Permeability Reservoir.

In the subsequent water flooding stage, the pressure P 1 at the injection end showed a trend of “first decreasing and then fluctuating”, which indicated that due to the later stage of water flooding, there was no subsequent injection of PPG particles, and the accumulated PPG began to be washed away and moved to the deep part, resulting in a significant pressure drop.

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