Page 141 - Formulas and Calculations for Petroleum Engineering

134 Formulas and calculations for petroleum engineering

Formula(s)

SF MW
LGS ¼ 0:3125 1 200
100 8:33

Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 95.

2.140 Maximum recommended solids fractions in drilling fluids
Input(s)

MW: Mud Weight (ppg)

Output(s)

SF: Maximum Recommended Solid Fraction (percent by volume)

Formula(s)

SF ¼ 2:917 MWÞ 14:17
ð

Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 96.

2.141 Maximum weight on bit
Input(s)

L d : Length of Drill Collar (ft)
W d : Unit Wight of Collar (lbf/ft)
SF: Safety Factor (dimensionless)
BF: Buoyancy Factor (dimensionless)
a: Wellbore Inclination (degree)

Output(s)

WOB: Maximum Weight on Bit (lbf)

Formula(s)

L W BF cos aðÞ
d
d
WOB ¼
SF
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 380.

2.142 Mechanical energy balance for wellbore fluids

Input(s)
p 1 , p 2 : Pressure at positions 1 and 2 (psi)
3
r f : Fluid Density (lbm/ft )