Page 525 - Air and Gas Drilling Manual

10-50 Air and Gas Drilling Manual
Q
ga5
sfa5
Q
Q
ga5
0 426 w
.
sfa5
.
0 426 0 234
.
0 646
.
sfa5
Using Equation 10-5, the absolute viscosity of the foam as it exits this
openhole annulus section is
0 00002089 1 3 6 0 646)
(
.
.
.
sfa5
lb sec
.
0 00006943
sfa5 2
ft
The specific weight of the foam as it exits this openhole annulus section is
approximated by
w ˙ w ˙
g w
sfa5
P T
at av5
Q g Q w
P a4 T at
.
.
1 821 14 60
sfa5
.
,
1 826 6 . 601 91
( 27 64) 0 234
.
.
.
137 281 519 67
,
.
24 881 lb/ft 3
sfa5
Using Equation 1-2, the density of the foam as it exits this openhole annulus is
24 881
.
sfa5
.
32 2
lb sec 2
0 773
.
sfa5 4
ft
From Equation 9-7, the kinematic viscosity of the foam as it exits this openhole
annulus section is