Experimental Study on the Damage of Artificial Fracture Permeability in Coal during the Flow Back of Guar-Based Fracturing Fluid

<div>Photograph of the proppant embedment phenomenon. (a) The surface of the coal sample before the experiment. (b) The embedment of the ceramic proppant. (c) The embedment of the quartz sand proppant. (d) The embedment of the coal sample surface after the experiment.</div>

Geofluids

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Figure 10

Figure 10: Experimental Study on the Damage of Artificial Fracture Permeability in Coal during the Flow Back of Guar-Based Fracturing Fluid 