Page 89 - Formulas and Calculations for Petroleum Engineering
P. 89
82 Formulas and calculations for petroleum engineering
Formula(s)
2
2
N +N +N 2 c
b
a
A ¼
1303:8
Wm
2
Pba ¼ CaÞ
ð
10858 A
Wm
2
Pbb ¼ CbÞ
ð
10858 A
P ¼ Cpa Pba
ca
P ¼ Cpb Pbb
cb
P ca
log
P cb
M ¼
Ca
log
Cb
P max
P iopt ¼ 2
M +1
P max
P hopt ¼ 2
P +1
max
P iopt
1+ M
Pilb ¼ Ca
P max
P hopt
1+ M
Phlb ¼ Ca
P max
Q iopt ¼ P max P iopt
Q ¼ P P
hopt max hopt
0:5
Wm
2
A ¼ Q iopt *
in
10858 P max
0:5
Wm
2
A ¼ Q hopt *
hn
10858 P max
0:5
A
A ¼ d
n
n 0:7854
Reference: Formulas and Calculations for Drilling, Production and Workover, Second Edition, Lapeyrouse, Page: 166.
2.20 Borehole torsion—Cylindrical helical method
Input(s)
k h : Horizontal Curvature (degree/100ft)
k v : Vertical Curvature (degree/100ft)
k: Curvature of Wellbore Trajectory (degree/100ft)
a: Inclination Angle (degree)
Output(s)
t: Borehole Torsion—Cylindrical Helical Method (degree/100ft)
