Experimental Methodology
In the first stage, the microfluidic chip is filled with oil from the actual reservoir. Then, in the same direction, the fracturing fluid is injected. To initiate the backflow, oil is injected in the opposite direction from the initial injection, simulating the oil extraction phase.
At this stage, the displacement front from the fracturing fluid is analyzed using a fluorescent microscope, characterized by a productivity coefficient. An additional parameter indicating the quality of the back displacement of the model was the change in pressure drop during the back pumping.
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