Page 317 - Well Control for Completions and Interventions

308 Well Control for Completions and Interventions

volume pumped ðbblsÞ
Height of fluid column ðftÞ 5 becomes
tubing capacity ðbbl=ft:Þ
16:39
5 1100 ft:
0:0149

ð
Hydrosatic pressure 5 kill fluid gradient 2 gas gradientÞ
3 height of fluid column
(0.5824 2 0.08) 3 1100 5 553 psi.
8. Bleed back to the wellhead pressure at the start of the kill (4911 psi).
Continue to bleed off pressure equal to hydrostatic increase from the
fluid pumped (553 psi). 4911 2 553 5 4358 psi. Up to this point the
kill is identical to the constant volume method. The constant pres-
sure method differs from this point on in that the volume pumped
regulated by the maximum allowable surface pressure.
9. Stage 2: Pump fluid until the wellhead pressure reaches the maxi-
mum allowable value of 5500 psi. Calculate the volume pumped and
consequent reduction in pressure.

4358 3 136:61
Volume to reach P max 5 5 108:24 bbls
5500
Volume pumped 5 136.61 108.24 5 28.37 bbls.
28:37
Height of fluid column 5 5 1904ft:
Tubing capacity 0:0149

ð
Hydrosatic pressure 5 kill fluid gradient 2 gas gradientÞ
3 height of fluid column
(0.5824 2 0.08) 3 1904 5 957 psi.
10. Bleed back to the original wellhead pressure (4358 psi) plus the hydro-
static increase from the fluid pumped (957 psi). 4358 2 957 5 3401 psi.
11. Stage 3: Pump fluid until the wellhead pressure reaches the maxi-
mum allowable value of 5500 psi. Calculate the volume pumped and
consequent reduction in pressure.
3401 3 108:24
Volume to reach P max 5 5 66:93 bbls
5500
Volume pumped 5 108.24 2 66.93 5 41.31 bbls.