Page 421 - Air and Gas Drilling Manual

T
T
at
g
Using Equation 4-11, the specific weight of the gas entering the compressor is
1
0
(,826 519 67.˚R Chapter 9: Aerated Fluid Drilling 9-25
1
. ) ( . )
6
g
(53 .36 ) (519 . )
67
0 0659 lb/ft 3
.
g
The weight rate of flow of the air, ˙ w , is
g
19 47
˙ w (. 0 0659 ) ( . )
g
˙ w . 1 283 lb/sec
g
The volumetric flow rate of drilling mud, Q m, in consistent units is
191 231
Q
m 3
12 60
3
.
Q m 0 426 ft /sec
The weight rate of flow of the drilling mud, ˙ w , is
m
˙ w 75 .0 . 0 426
m
˙ w 31 .92 lb/sec
m
The openhole diameter, D h, is
d h 7 875 inches
.
d h
D h
12
.
D h 0 656 ft
The estimated drilling rate of penetration is 60 ft/hr. Using Equation 9-10, the
weight rate of flow of solids, ˙ w , from the advance of the drill bit is
s