Page 165 - Formulas and Calculations for Petroleum Engineering

158 Formulas and calculations for petroleum engineering

Output(s)

V s : Spacer Volume (bbl)

Formula(s)

C a
V ¼ V C p
s
a
E
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 62.

2.200 Specific gravity of cuttings by using mud balance
Input(s)

R w : Resulting Weight with Cuttings Plus Water (ppg)

Output(s)

SG: Specific Gravity of Cuttings (unitless)

Formula(s)

1
SG ¼
ð
2 0:12 R Þ
w
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 41.

2.201 Stripping/snubbing calculations—Breakover point between stripping and
snubbing

Input(s)
Dp: Pipe or collar OD (in.)
P: Wellbore Pressure (psi)
W dc : Weight of Drill Collar (lb/ft)
L: Drill Collar Length (ft)
BF: Buoyancy Factor (dimensionless)
W dp : Drill Pipe Weight (lb/ft)

Output(s)

F: Force created by wellbore pressure on Drill collar or pipe (lb)
W: Weight of Drill Collar (lb)
W adp : Additional weight required from Drill Pipe (lb)
L bp : Length of Drill Pipe required to reach over breakover point (ft)
L ds : Length of Drill string req to reach breakover point (ft)