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="tab3"><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">Pore diameter (<i>μ</i>m)</td><td class="align_center">Expansion ratio (%)</td><td class="align_center">Gray value of intergranular pore</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">7.261</td><td class="align_center">—</td><td class="align_center">4536</td></tr><tr><td class="align_left">9 h after fracturing fluid invasion</td><td class="align_center">7.638</td><td class="align_center">5.19</td><td class="align_center">4853</td></tr><tr><td class="align_left">24 h after fracturing fluid invasion</td><td class="align_center">8.632</td><td class="align_center">18.88</td><td class="align_center">5240</td></tr><tr><td class="align_left">72 h after fracturing fluid invasion</td><td class="align_center">9.277</td><td class="align_center">27.77</td><td class="align_center">5760</td></tr><tr><td class="align_left">24 h after formation water flooding</td><td class="align_center">7.282</td><td class="align_center">2.96</td><td class="align_center">4570</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Changes of typical intergranular pore size over time.</div>

Geofluids

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Table 3

Table 3: 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 3 | 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 