Research on the Characteristics of Microscopic Damage to Different Pore Types by Slippery Water Fracturing Fluid in the Chang Member Tight Sandstone Reservoir, Ordos Basin, NW China

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">State</td><td class="align_center">Openness degree (<i>μ</i>m)</td><td class="align_center">Rate of change of openness degree (%)</td><td class="align_center">Image; gray in the fracture area</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Saturated formation water</td><td class="align_center">2.554</td><td class="align_center">—</td><td class="align_center">5338</td></tr><tr><td class="align_left">9 h after fracturing fluid invasion</td><td class="align_center">1.309</td><td class="align_center">48.77</td><td class="align_center">6139</td></tr><tr><td class="align_left">24 h after fracturing fluid invasion</td><td class="align_center">1.092</td><td class="align_center">57.24</td><td class="align_center">6671</td></tr><tr><td class="align_left">72 h after fracturing fluid invasion</td><td class="align_center">0</td><td class="align_center">100.00</td><td class="align_center">7952</td></tr><tr><td class="align_left">24 h after formation water flooding</td><td class="align_center">2.5625</td><td class="align_center">—</td><td class="align_center">5449</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Variation of fracture width changes over time.</div>

Geofluids

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Table 4

Table 4: Research on the Characteristics of Microscopic Damage to Different Pore Types by Slippery Water Fracturing Fluid in the Chang Member Tight Sandstone Reservoir, Ordos Basin, NW China 

Table 4 | Research on the Characteristics of Microscopic Damage to Different Pore Types by Slippery Water Fracturing Fluid in the Chang Member Tight Sandstone Reservoir, Ordos Basin, NW China 