Page 257 - Formation Damage during Improved Oil Recovery Fundamentals and Applications

228 Xingru Wu

(A)
5 1200 5
Calcite
Barite
1000
4 Celestite 4
800 3
SI-Celestite SI-Barite 600 SI-Calcite
3

2
400 2
1 1
200

0 0 0
0.0 0.2 0.4 0.6 0.8 1.0
Seawater fraction

(B)
30 2000 60

Celestite concentration, mg/L 20 Barite concentration, mg/L 1500 40 Calcite concentration, mg/L
25
50

15
1000
30
10
Calcite
Celestite
5 500 Barite 20
10
0 0
0.0 0.2 0.4 0.6 0.8 1.0
Seawater fraction
Figure 5.6 Scale index and concentration of North Sea Water mixing with Miller
water at different pressures and temperatures. (A) Scale indices of calcite, barite, and
celestite at reservoir condition; (B) concentrations of calcite, barite, and celestite at
the reservoir conditions; (C) scale indices of calcite, barite, and celestite at wellhead
condition; (D) concentration of calcite, barite, and celestites at wellhead condition.