Page 99 - Formulas and Calculations for Petroleum Engineering

92 Formulas and calculations for petroleum engineering

Formula(s)

y600
n ¼ 3:32 log
y300
y600
K ¼ n
1022
0:387
n ðÞ
x ¼ 81600 K n
ð ð Dh DpÞ Þ MW
1
AVc ¼ x 2 nðÞ
2
Dh Dp 2
GPMc ¼ AVc
24:5

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: 212.

2.40 Critical flow rate for flow regime change

Input(s)
V c : Critical Velocity (ft/s)
D i : Integral Diameter of Pipe (in.)

Output(s)

Q c : Critical Flow Rate (gpm)

Formula(s)

2
Q ¼ 2:448 V D
c c i
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 220.

2.41 Critical velocity for change in flow regime

Input(s)
PV: Plastic Viscosity (cP)
2
YP: Yield Stress or Yield Point (lb/100 ft )
r m : Mud Density (ppg)
D i : inside Diameter of Pipe (in.)

Output(s)
V c : Critical Velocity (ft/s)