Page 216 - Enhanced Oil Recovery in Shale and Tight Reservoirs

Fluid-rock interactions 199

Table 8.2 Pump schedule in a Woodford shale frac. job (Grieser et al., 2007).
Conc., Ibm/
Stage Vol., gal Fluid gal Proppant
1 Acid 4,000 15% HCl acid
spearhead
2 Pad 26,400 Pad and flush
3 Sand slug 5,000 Treated water 0.1 Premium
Brown-30/70
4 Pad 26,400 Pad and flush
5 Sand slug 5,000 Treated water 0.15 Premium
Brown-30/70
6 Pad 26,400 Pad and flush
7 Sand slug 5,000 Treated water 0.2 Premium
Brown-30/70
8 Pad 26,400 Pad and flush
9 Sand slug 5,000 Treated water 0.25 Premium
Brown-30/70
10 Pad 26,400 Pad and flush
11 Sand slug 14,240 Treated water 0.1 Premium
Brown-30/70
12 Acid 7,120 28% HCl acid
cut on the fly
to 3%
13 Sand slug 14,240 Treated water 0.19 Premium
Brown-30/70
14 Acid 7,120 28% HCl acid
cut on the fly
to 3%
15 Sand slug 14,240 Treated water 0.28 Premium
Brown-30/70
16 Acid 7,120 28% HCl acid
cut on the fly
to 3%
17 Sand slug 14,240 Treated water 0.37 Premium
Brown-30/70
18 Acid 7,120 28% HCl acid
cut on the flyto
3%
19 Sand slug 14,240 Treated water 0.46 Premium
Brown-30/70
20 Acid 7,120 28% HCl acid
cut on the fly
to 3%
21 Sand slug 14,240 Treated water 0.55 Premium
Brown-30/70
(Continued)