Experimental Investigations of the Process of Carbonate Fracture Dissolution Enlargement under Reservoir Temperature and Pressure Conditions
Table 4
The dissolution rate of the CFDE experiments.
Sample
Length (cm)
Width (cm)
Confining pressure (MPa)
Back pressure (MPa)
Temperature (°C)
Solution
PCO2 (MPa)
pH
Flow rate (ml/min)
Average [Ca2+] (mg/l)
Average dissolution rate (mol/m2/s)
S1
8.12
6.00
20
8
60
CO2-rich water
8
0.2
303.16
2.50 × 10−6
S2
8.49
6.00
20
8
50
8
0.2
372.02
3.11 × 10−6
S3
6.01
6.00
20
8
40
8
0.2
239.30
2.70 × 10−6
S4
6.13
6.00
20
8
60
8
0.2
245.13
3.04 × 10−6
Micritic limestone
Crushed materials
5
H2SO4
4.7
1.8
2.42 × 10−7
Crushed materials
26
4.7
1.8
10.88 × 10−7
Sparitic limestone
Crushed materials
5
H2SO4
4.7
1.8
4.19 × 10−7
Crushed materials
26
4.7
1.8
7.74 × 10−7
Cement core
22.48
3.72
6343
4137
25
CO2-rich brine
68.9
3.9
0.498
250
V1
4.71
3.81
28.9
14.3
61
CO2-rich water
12.5
0.23
1360
V2
4.88
3.81
28.8
14.3
61
12.5
0.1
1380
Note: The data on S1, S2, S3, and S4 come from this paper. The data on micritic limestone and sparitic limestone come from Kirstein et al. [20]. The data on cement core come from Cao et al. [2]. The data on V1 and V2 come from Elkhoury et al. [26].
