Page 167 - Formulas and Calculations for Petroleum Engineering

160 Formulas and calculations for petroleum engineering

Output(s)

MASP: Maximum Allowable Surface Pressure governed by Casing Burst Pressure (psi)

Formula(s)

MASP ¼ P Sð Þ W Wð Þ 0:052 H
bc u o
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 143.

2.204 Stripping/snubbing calculations—Maximum allowable surface pressure
governed by formation
Input(s)

W max : Max allowable mud Weight (ppg)
W u : Mud Weight in use (ppg)
H: Casing Shoe TVD (ft)

Output(s)

MASP: Maximum Allowable Surface Pressure governed by Formation (psi)

Formula(s)

MASP ¼ W max W Þ 0:052
ð
u
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 143.

2.205 Stripping/snubbing calculations—Minimum surface pressure before stripping

Input(s)
W c : Weight per feet of one stand of Drill Collar (lb/ft)
L: Length of one stand (feet)
D: Drill Collar Dia (in.)

Output(s)
P min : Minimum surface Pressure before stripping is possible (psi)

Formula(s)

L
P min ¼ W
c
2
D 0:7854
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 141.