Journal of Chemistry / 2015 / Article / Tab 6

Research Article

Polymer Drilling Fluid with Micron-Grade Cenosphere for Deep Coal Seam

Table 6

Results of dynamic damage experiments.

Core Permeability measured with gas/10−3μm2 Permeability measured with water/10−3μm2Fracture width/μm Filter loss/mLNatural flowback
Breakthrough pressure/MPaMaximum recovery rate/%Differential pressure under maximum recovery rate/MPa

396.860.6328.060.982.193.212.5
4147.651.3934.211.591.688.302.1
5213.972.4239.942.640.783.621.2