Research Article
Research on Hydraulic Fracturing Technology of Long Boreholes along Strata of High Vast Thick Coal Seam
Figure 9
Cloud image of pore pressure during fracturing: (a) Step 1, (b) Step 48, (c) Step 58, (d) Step 63, (e) Step 65, and (f) Step 68.
(a) |
(b) |
(c) |
(d) |
(e) |
(f) |