Page 45 - Well Control for Completions and Interventions

36 Well Control for Completions and Interventions

When calculating capacity remember
to use the measured depth of the well
Capacity from formula:
If tables are not available, pipe and annular capacity can be obtained
using formula providing the pipe dimensions are known (ID and OD).
For oilfield units, tubing capacity in cubic inches is calculated from:
3
1ft 5 1728 in: 3
1 bbl 5 5:6146 ft 3
1 bbl 5 9702 in: 3
2
π 3 ID 3 12
Tubing capacity can therefore be expressed as: 5
4 3 9702
2
ID
bbls=ft
1029:4
ID 2

Tubing or casing capacity bbls=ft 5 (1.14)
1029:4
ID 2
Tubing or casing capacity gallons=ft 5 (1.15)

24:51
ID 2
3
Tubing or casing capacityðft =ftÞ 5 (1.16)
183:35
Where ID is in inches.
Annular capacity between casing (or open hole) and tubing (or
drill-pipe).
2
Casing ID 2 Tubing OD 2
Annular capacity in bbls=ft 5 (1.17)
1029:4
1029:4
Annular capacity in ft=bbl 5 (1.18)
2
Casing ID 2Tubing OD 2
2
Casing ID 2 Tubing OD 2
Annular capacity in gallons=ft 5 (1.19)
24:51
24:51
Annular capacity in ft=gallons 5 (1.20)
2
Casing ID 2Tubing OD 2
Annular capacity between casing and multiple strings of tubing, i.e.,
dual or triple string completions.

2

2
CasingID 2 Tubing1OD 2 Tubing2OD 2
Annularcapacityinbbls=ft5
1029:4
(1.21)