Page 84 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 77

Output(s)

AC: Annular Capacity (gal/ft)

Formula(s)

2
2

D T +T 2 b
h
a
AC ¼
1029:4
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 14.
2.9 Annular velocity—Using circulation rate in Gpm

Input(s)

Q: Circulation Rate (Pump Output) (gpm)
D h : Inside Diameter of Casing (in.)
D p : Outside Diameter of Pipe, Tubing or Collars (in.)

Output(s)
AV: Annular Velocity (ft/min)

Formula(s)

24:5 Q
AV ¼
2 2
D D
h p
Notes: The Formula Calculates Annular Velocity (ft/min) using Circulation Rate (Pump Output) (gal/min)

Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 10.

2.10 Annular velocity—Using pump output in bbl/min

Input(s)

Q: Circulation Rate (gpm)
D h : Inside Diameter of Casing or Hole Size (in.)
D p : Outside Diameter of Pipe, Tubing or Collars (in.)

Output(s)
AV: Annular Velocity (ft/min)

Formula(s)

½ 24:5 QŠ
AV ¼
2
2
ð D Þ D p
h
Reference: Lyons, W. C., Carter, T., and Lapeyrouse, N. J., 2012, Formulas and Calculations for Drilling, Production and
Workover, Third Edition, Gulf Professional Publishing, Page: 10.