Page 156 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 149

Formula(s)

y L
P ¼
m
300 d
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 79.

2.178 Pressure required to overcome mud’s gel strength in annulus

Input(s)
2
y: Gel Strength of Drilling Fluid (lb/100 ft )
D h : Hole Diameter (in.)
D p : Pipe Diameter (in.)
L: Length of Drillstring (ft)

Output(s)

P m : Pressure Required (psi)

Formula(s)

y L
P ¼
m
300 D D p
h
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 79.

2.179 Pump calculation—Pump pressure
Input(s)

P d : Frictional Pressure Losses (psi)
DP: Bit Pressure Drop (psi)

Output(s)
P p : Pump Pressure (psi)

Formula(s)

P ¼ DP+ P d
p

Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 69.

2.180 Pump calculations—Power required
Input(s)

Q: Flow Rate (gpm)
DP: Bit Pressure Drop (psi)