Page 140 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 133

2.137 Maximum length of a slanted well in a given reservoir thickness

Input(s)
h: Pay Zone Thickness (ft)
a: Angle of inclination of drilling (degrees)

Output(s)
L: Length of Slant Wellbore (ft)

Formula(s)

h
L ¼
p
cos a
180

Reference: Horizontal Well Technology, Joshi, Page: 96.

2.138 Maximum length of drillpipe for a specific bottomhole assembly

Input(s)
T: Tensile Strength of Pipe (lb)
f: Safety Factor (unitless)
MOP: Margin of Overpull (unitless)
W b : Weight of Bha in Air (lb/ft)
W d : Weight of Drill Pipe in Air (lb/ft)
BF: Buoyancy Factor (unitless)

Output(s)
L m : Maximum Length (ft)

Formula(s)

ð ð T fÞ MOP W Þ BF
b
L ¼
m
W
d
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 43.

2.139 Maximum recommended low-gravity solids
Input(s)

SF: Maximum Recommended Solids Fractions (% by vol)
MW: Mud Weight (ppg)

Output(s)

LGS: Maximum Recommended Lgs (% by vol)