Blowout Simulations Using Olga-Well-Kill
Simulations of the blowout scenarios give estimates of the oil and gas rates and flowing bottom hole pressures. These simulations also define the starting point for the kill simulations. The blowout rates can be viewed as a function of:
Reservoir productivity and pressure
Flowing fluid type
Flow path sizes, lengths, restrictions and friction
Exit conditions
The flow path consists of the standard completion and pipe in the hole, with no additional restrictions due to fishes or junk in the hole for these "worst case" scenarios.
Exit conditions are open blowouts to surface with the failed BOP or production tree essentially not giving much restriction to flow. A hole larger than 2" (50 mm) diameter would essentially be similar to a fully open BOP in terms of the blowout rates in this study.
Table -1: Blowout rates Scenario 1
Alpha Well - Scenario 1 |
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Scenario |
Flow |
Inflow |
Reservoir |
Reservoir |
Flowing |
Gas |
Gas |
No. |
Path |
From |
Temperature |
pressure |
BHP |
rate |
rate |
in |
Sand |
Deg C |
bar |
bar |
Mill. m/d | MMscf/d | |
1a |
12¼"-5"dp |
2 |
125.2 |
461.7 |
169.5 |
6.0 |
212 |
1a |
133/8"-5"dp |
3 |
131.0 |
703.6 |
172.7 |
5.6 |
200 |
Total 1a |
2+3 |
11.6 |
412 |
||||
1b |
12¼" |
2 |
125.2 |
461.7 |
108.5 |
6.3 |
224 |
1b |
133/8" |
3 |
131.0 |
703.6 |
109.9 |
5.8 |
204 |
Total 1b |
2+3 |
12.1 |
428 |
Table -2: Blowout rates Scenario 2
Alpha Well - Scenario 2A and 2B |
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Scenario |
Flow |
Inflow |
Reservoir |
Reservoir |
Flowing |
Gas |
Gas |
No. |
Path |
From |
Temperature |
Pressure |
BHP |
Rate |
Rate |
in |
Sand |
Deg C |
Bar |
Bar |
Mill. m/d | MMscf/d | |
2A |
8½"- 8½"-5"dp 97/8"-5"dp |
3 |
131.0 |
703.6 |
646.4 |
1.8 |
64 |
2A |
6 |
138.5 |
832.4 |
656.5 |
1.3 |
47 |
|
2A |
7 |
139.9 |
844.6 |
666.6 |
6.4 |
224 |
|
2A |
8 |
140.8 |
853.4 |
668.3 |
0.9 |
31 |
|
Total |
Pipe in hole |
3,6,7,8 |
10.4 |
366 |
|||
2B |
8½" 97/8" |
3 |
131.0 |
703.6 |
421.1 |
4.6 |
161 |
2B |
6 |
138.5 |
832.4 |
417.5 |
2.2 |
77 |
|
2B |
7 |
139.9 |
844.6 |
423.2 |
9.4 |
330 |
|
2B |
8 |
140.8 |
853.4 |
424.3 |
1.4 |
51 |
|
Total |
No pipe in hole |
3,6,7,8 |
17.6 |
619 |