Page 196 - A Practical Companion to Reservoir Stimulation

PRACTICAL CONSIDERATIONS FOR FRACTURE TREATMENT DESIGN

Oxidative Breaker Amine Catalyst Time Viscosity at 170 sec-1
(lb/lOOO gal) (lb/lOOO gal) (hr) (CP)

12.0 2.0 0.0 547
0.5 565
1 .o 591
2.0 51 8
3.0 301
4.0 209
5.0 127
6.0 28
2.0 0.5 0.0 575
1 .o 732
3.0 832
6.0 704
4.0 2.0 0.0 400
1 .o 504
3.0 333
4.0 306
8.0 2.0 0.0 450
0.5 439
1 .o 369
2.0 130
3.0 7
4.0 0.0 35 1
0.5 35 1
1 .o 67
2.0 4
0.5 0.0 396
0.5 31 2
1 .o 67
2.0 4
0.125 0.00 41 6
0.25 136
0.50 86
1 .oo 24
0.25 0.00 431
0.25 56
0.50 25

Table P-9-Breaker effects on the rheology of a 40 lb/1000 gal borate-crosslinked fluid.
I Fluid = 40-lb crosslinked borate Rate = 35 BPM Fluid temperature = 80°F BHST = 150°F I
~~
Maximum Exposure Oxidative
Dimensionless Exposure Time to Breaker
Volume Fracture Temperature BHST Concentration
Stage (gal) Position (OF) (min) (lb/lOOO gal fluid)
Pad 30,000 1 (depleted) 150 68 0.1
I 2 PPA I 10,000 I 0.9-1 I 150 I 49 I 0.5 I

4 PPA 15,000 0.65-0.7 150 41 0.5
6 PPA 20,000 0.35-0.65 150 29 2
8 PPA 25,000 0-0.35 150 7 4

P-31