Page 94 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 87

AC dp : Annular Capacity of Drill Pipe (bbl/ft)
V dc : Volume in Drill Collar (bbl)
V dp : Volume in Drill Pipe (bbl)
V a : Volume of Pill Required in Annulus (bbl)
V ts : Total Volume of Pill Required (bbl)
C t : Total Capacity of Drill String (bbl)
S pp : Strokes for Pump Pill (no.)
V cp : Volume Req for Chase Pill (bbl)
S cp : Strokes for Chase Pill (no.)
S t : Total Strokes to Spot the Pill (no.)

Formula(s)

2 2
ð hdÞ cdðÞ
AC ¼
dc
1029:4
2 2
ð hdÞ pdÞ
ð
AC ¼
dp
1029:4
V ¼ AC L WF
dc dc s
V ¼ AC L WF
e
dp
dp
V ¼ V +V
a dc dp
V ¼ V +V ds
a
ts

C ¼ C Þ L +C L
ð
t dc s dp
V ts
S ¼
pp
PO
V ¼ C V
cp t ds
V cp

S ¼ +S ds
cp
PO

S ¼ S +S
t pp cp
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishin, Page: 75.
2.30 Capacity formulas—bbl/ft
Input(s)
d h : Inside Diameter of Casing (in.)
d p : Outside Diameter of Casing (in.)

Output(s)
AC: Annular Capacity (bbl/ft)