Page 516 - Air and Gas Drilling Manual

Q
ga3
sfa3
Q
Q
ga3
0 730 w Chapter 10: Stable Foam drilling 10-41
.
sfa3
.
0 730 0 234
.
0 757
.
sfa3
Using Equation 10-5, the absolute viscosity of the foam as it exits this
openhole annulus section is
.
0 00002089 1 3 6 0 757)
.
.
(
sfa3
lb sec
.
0 00007784
sfa3 2
ft
The specific weight of the foam as it exits this openhole annulus section is
approximated by
w ˙ w ˙
g w
sfa3
P at T av3
Q g Q w
P a2 T at
.
.
1 821 14 60
sfa3
.
1 826 6 . 586 29
,
( 27 64) 0 234
.
.
78 039 519 67
,
.
17 036 lb/ft 3
.
sfa3
Using Equation 1-2, the density of the foam as it exits this openhole annulus is
17 036
.
sfa3
.
32 2
lb sec 2
.
0 529
sfa3 4
ft
From Equation 9-7, the kinematic viscosity of the foam as it exits this openhole
annulus section is