Page 295 - Well Control for Completions and Interventions

288 Well Control for Completions and Interventions

Kill Plot: Bullhead example
6000
Surface pressure
Min pump pressure
5000 Mechanical limit (no backup)
4864
Fracture limit.
4157
4000

3430 3430
Pressure 3000

2245
2000 2045
1802 1802

1000

0 0 0
0 159.57
Volume
Figure 7.15 Kill plot. Bullhead example.

P 2 : adjusted pressure;
P 2 : adjusted gas volume.
In a well control (gas migration) context, P 1 is reservoir pressure and
V 1 the size of a gas influx. P 2 is surface pressure and V 2 is the gas volume
at atmospheric pressure (surface conditions).
Rearrange the equation to determine the volume of gas at the surface:

P 1 V 1
V 2 5
P 2
Example (oilfield units):
A one barrel gas influx in a well with a reservoir pressure of 5000 psi
would result in 340 bbls of gas at the surface:

5000 3 1
V 2 5 5 340 bbls
14:7
Note: 14.7 is atmospheric pressure in psi at standard conditions.