Page 90 - Formulas and Calculations for Petroleum Engineering

Drilling engineering formulas and calculations Chapter 2 83

Formula(s)

! !
2
k ðÞ
v
t ¼ k 1+ 2 sin aðÞ cos aðÞ
h 2
k
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 84.

2.21 Bottomhole annulus pressure
Input(s)

r a : Annulus Fluid Density (ppg)
D av : Vertical Height in the Annulus (ft)

Output(s)
P bh : Annulus Pressure (psi)

Formula(s)

P ¼ 0:052 rðÞ D Þ
ð
bh
av
a
Reference: Samuel. E Robello. 501 Solved Problems and Calculations for Drilling Operations. Sigma Quadrant. 2015.
Houston, Texas, Page: 134.
2.22 Bottomhole assembly length required for a desired weight on bit

Input(s)
W b : Desired Weight to be used while Drilling (lb)
f: Safety Factor (fraction)
W d : Drill Collar Weight (lb/ft)
BF: Buoyancy Factor (unitless)

Output(s)

L: Length of Bottomhole Assembly (ft)

Formula(s)

W f
b
L ¼
W BF
d
Reference: Lapeyrouse, N. J., 2002, Formulas and Calculations for Drilling, Production and Workover, Second Edition,
Gulf Professional Publishing, Page: 42.

2.23 Bulk density of cuttings—Using the mud balance

Input(s)
W r : Resulting Mud Weight with Cuttings and Water (ppg)