Page 497 - Air and Gas Drilling Manual

10-22 Air and Gas Drilling Manual
d
h
D
12
D h h 0 656 ft
.
The estimated drilling rate of penetration is 60 ft/hr. Using Equation 10-2, the
weight rate of flow of solids, ˙ w , from the advance of the drill bit is
s
60
2
˙ w . 0 656 62 .4 . 2 7
s
4 60 60
˙ w . 0 949 lb/sec
s
The total weight rate of flow, ˙ w , in the annulus is
t
˙ w . 1 821 14 .60 . 0 949
t
˙ w 17 .37 lb/sec
t
The absolute viscosity of the water (and surfactant), , is assumed to be
w
approximately
1 cps
w
1
0
(. ) ( .001 ) ( .2089 )
0
0
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
.
lb sec 2
1 938
.
w 4
ft
From Equation 9-7, the kinematic viscosity of the incompressible, w , is
.
0 00002089
w
.
1 938