Page 521 - Air and Gas Drilling Manual

10-46 Air and Gas Drilling Manual
g
sfa4
P
P at a3 w ˙ T T av4 w ˙ w Q g Q w
at
.
1 821 14 60
.
sfa4
1 826 6 . 598 79
.
,
.
.
( 27 64) 0 234
132 346 519 67
.
,
.
24 379 lb/ft 3
sfa4
Using Equation 1-2, the density of the foam as it exits this openhole annulus is
.
24 379
sfa4
.
32 2
2
lb sec
0 757
.
sfa4 4
ft
From Equation 9-7, the kinematic viscosity of the foam as it exits this openhole
annulus section is
.
0 00006997
sfa4
.
0 757
ft 2
0 00009242
.
sfa4
sec
The average velocity of the foam as it exits this openhole annulus section is
P at T av4
Q g Q w
P T
a3 at
V
sfa4
D h 2 D 3 2
4
.
1 826 6 . 598 79
,
.
.
( 27 64) 0 234
,
132 346 519 67
.
V sfa4
0 656 2 0 552 2
.
.
4