Experimental Study on Crack Extension Rules of Hydraulic Fracturing Based on Simulated Coal Seam Roof and Floor

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2022/7462201/figures/7462201.fig.003a.svgz" name="7462201.fig.003a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Molding specimen</td></tr><tr class="fig-image" id="b"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2022/7462201/figures/7462201.fig.003b.svgz" name="7462201.fig.003b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Similar drilling: (A) fracturing tube, (B) open hole section, (C) roof, (D) coal seam, and (E) floor</td></tr></table>

<div>Similar material molding specimens.</div>

Geofluids

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Figure 3

Figure 3: Experimental Study on Crack Extension Rules of Hydraulic Fracturing Based on Simulated Coal Seam Roof and Floor 