Page 305 - Well Control for Completions and Interventions

298 Well Control for Completions and Interventions

Figure 7.19 Well schematic. Lubricate-and-bleed example.

2. Calculate kill weight fluid density and gradient (to kill to the plug).
Pressure at the plug is reservoir pressure minus the gas hydrostatic
from the top of the reservoir to the plug depth. Gas gradient is
0.08 psi/ft. (10,450 10,250) 3 0.08 5 16 psi. Pressure at plug is
5747 16 5 5731 psi.
5731 1 200
Kill fluid ppgÞ 5 5 11:127-11:2 ppg
ð
10250 3 0:052
11:2 ppg 3 0:052 5 0:5824 psi=ft:

3. Calculate the tubing volume (to the plug)
Tubing volume 5 0:0149 3 10; 250 5 152:725 bbls-153 bbls:

4. Fluid is pumped into the well until the maximum wellhead pressure
(5500 psi) is reached. Increasing pressure will compress the gas. The
amount of gas compression, and therefore the amount of fluid that
can be pumped is calculated using Boyle’s aw.