Page 169 - Formulas and Calculations for Petroleum Engineering

162 Formulas and calculations for petroleum engineering

Formula(s)

2 2
fpc ¼ OD ID 0:7854 2500
fpc
h ¼ S
f
PF
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 74.

2.209 Stuck pipe calculations—Method-2

Input(s)
e: Pipe Stretch (in.)
Wdp: Drill Pipe Wt. (lb/ft)
Pd: Differential Pull (lb)

Output(s)
h f : Feet of Free pipe (ft)

Formula(s)

Wdp
h ¼ 735294 e
f
Pd
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 74.

2.210 Subsea considerations—Adjusting choke line pressure loss for higher mud
weight

Input(s)
W o : Old mud weight (ppg)
W n : Higher mud weight (ppg)
CLPLO: Old Choke line Pressure Loss for higher mud weight (psi)

Output(s)
CLPL: Adjusted CLPL for higher mud weight (psi)

Formula(s)

CLPLO
CLPL ¼ W
n
W
o
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 144.

2.211 Subsea considerations—Casing burst pressure-subsea stack
Input(s)

YP: Internal Yield Pressure (psi)