Page 82 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 75

Formula(s)

r 11:207983
ð
+ r CÞ 94 8:33 CÞ
ð
S
Gc
A r A
x ¼
1+ r +
100 8:33 S Ga 100
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 53.
2.4 Amount of cement to be left in casing

Input(s)
L c : Casing Length (ft)
D: Setting Depth of Cementing Tool (ft)
3
C c : Casing Capacity (ft /ft)

Output(s)
3
AC: Amount of Cement (ft )

Formula(s)

AC ¼ L DÞ C c
ð
c
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 58.

2.5 Amount of mud required to displace cement in drillpipe
Input(s)

L d : Length of Drillpipe (ft)
C p : Drill Pipe Capacity (bbl/ft)

Output(s)
A m : Amount of Mud Required (bbl)

Formula(s)

A ¼ L C p
d
m
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 58.

2.6 Angle of twist—Rod subjected to torque
Input(s)

E: Modulus of Elasticity (psi)
u: Poisson (dimensionless)