Research on Gas Extraction Technology of Directional Long Borehole in Ultrathick Coal Seam

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2022/6957896/figures/6957896.fig.002a.svgz" name="6957896.fig.002a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Geometrical and dimensional drawings</td></tr><tr class="fig-image" id="b"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2022/6957896/figures/6957896.fig.002b.svgz" name="6957896.fig.002b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Grid drawing</td></tr></table>

<div>Geometric diagram and grid diagram of gas extraction model in directional borehole.</div>

Geofluids

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Figure 2

Figure 2: Research on Gas Extraction Technology of Directional Long Borehole in Ultrathick Coal Seam 