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Drilling engineering formulas and calculations Chapter 2 101
Formula(s)
65:5 MW
L ¼
max
65:5
!
BF
Depth ¼ T fð½ Þ MOP W bha
t
W
dp
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, second edition,
Gulf Professional Publishing, Page: 43.
2.61 Drilled gas entry rate
Input(s)
d b : Bit Diameter (in.)
R: Penetration Rate (ft/h)
S g : Gas Saturation (fraction)
Ø: Formation Porosity (per cent)
p: Pressure (psi)
z: Gas Compressibility Factor (dimensionless)
t: time (h)
Output(s)
q gsc : Drilled Gas Entry Rate (SCF/min)
Formula(s)
2
d RØS p
g
b
q ¼
gsc
310 zT
Reference: Watson, D., Brittenham, T., & Moore, P. L. (2003). Advanced Well Control (Vol. 10). Society of Petroleum
Engineers., Page: 19.
2.62 Drilling cost per foot
Input(s)
B: Bit Cost ($)
C R : Rig Cost ($)
T: Rotating Time (spm)
t: Round Trip Time (spm)
F:F ootage per Bit (ft)
Output(s)
C T :Drilling Cost ($)
