Page 93 - Formulas and Calculations for Petroleum Engineering

86 Formulas and calculations for petroleum engineering

Output(s)

3
AC: Annular Capacity (ft /ft)
3
CC ** : Casing Capacity (ft /ft)
3
C c : Casing Capacity (ft )
3
V s : Volume of Slurry (ft )
h a : Height of Cement in Annulus (ft)
3
h tc : Depth of Top of Cement in Annulus (ft /stroke)
N m : Number of Barrels of Mud Required to Displace the Cement (bbl)
S: Number of Strokes Required to Displace the Cement (Strokes)
Formula(s)

2
H OD 2
AC ¼
183:35
2
ð IDÞ
CC ¼
183:35
C ¼ N Y
c s s
V ¼ h h Þ CC
ð
s c sd
ð V C Þ
c
s
h ¼
a AC
E
h ¼ h h
tc c a
N ¼ h DC
m sd
N m
S ¼
PO
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 57.

2.29 Calculations required for spotting pills

Input(s)
hd: Diameter of Hole (in.)
pd: Diameter of Drill Pipe (in.)
cd: Diameter of Drill Collar (in.)
L s : Length of Section (ft)
L e : Length Above the Collar (ft)
WF: Washout Factor (fraction)
V ds : Volume Left in Drill String (bbl)
C dc : Drill Collar Capacity (bbl/ft)
C dp : Drill Pipe Capacity (bbl/ft)
L: Length (ft)
PO: Pump Output (bbl/stroke)
S ds : Strokes of Drill Pipe (fraction)

Output(s)

AC dc : Annular Capacity of Drill Collar (bbl/ft)