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="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Time (h)</td><td class="align_center">Size (<i>μ</i>m)</td><td class="align_center">Rate of change (%)</td><td class="align_center">Gray value</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">6.283</td><td class="align_center">—</td><td class="align_center">8245</td></tr><tr><td class="align_left">9 h after fracturing fluid invasion</td><td class="align_center">1.794</td><td class="align_center">71.45</td><td class="align_center">7335</td></tr><tr><td class="align_left">24 h after fracturing fluid invasion</td><td class="align_center">2.234</td><td class="align_center">82.22</td><td class="align_center">7121</td></tr><tr><td class="align_left">72 h after fracturing fluid invasion</td><td class="align_center">0.544</td><td class="align_center">91.34</td><td class="align_center">6952</td></tr><tr><td class="align_left">24 h after formation water flooding</td><td class="align_center">4.064</td><td class="align_center">35.32</td><td class="align_center">7863</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Changes of micropore size over time.</div>

Geofluids

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Table 5

Table 5: 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 5 | 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 