Page 534 - Air and Gas Drilling Manual

Chapter 10: Stable Foam drilling 10-59
lb sec
0 000000251
.
g
2
ft
Using Equation 4-11, the approximate specific weight of the gas as it enters this
drill collar section is determined from P i5. This is
( 299 729) ( 1 0)
,
.
gi5
( 53 36) ( 601 91)
.
.
933 lb/ft 3
.
gi5
Using Equation 1-2, the density of the gas as it enters this drill collar section, gi5 ,
is
933
.
gi5
32 2
.
lb sec 2
0 290
.
gi 5 4
ft
From Equation 9-7, the kinematic viscosity of the gas at this location, gi5 , is
.
0 000000251
gi5
0 290
.
ft 2
0 000000865
.
gi5
sec
The absolute viscosity of the water (and surfactant), , is assumed to be
w
approximately
1 cps
w
0
0
0
(. ) ( .001 ) ( .2089 )
1
w
lb sec
.
0 00002089
w 2
ft
Using Equation 1-2, the density of the incompressible fluid, w , is
62 4
.
w
32 2
.