Page 418 - Air and Gas Drilling Manual

9-22 Air and Gas Drilling Manual
T
sr
T
av
2
504 41 T bh 604 41
.
.
T av
2
T av 554 41.˚R
The openhole diameter, D h, is
d 7 875 inches
.
h
d h
D h
12
.
D 0 656 ft
h
The estimated drilling rate of penetration is 60 ft/hr. The weight rate of flow of
solids, ˙ w , from the advance of the drill bit is
s
˙ w D 2 62 .4 S (9-10)
s h s
4 (60 ) (60 )
2 60
˙ w . 0 656 62 .4 . 2 7
s
4 60 60
˙ w . 0 949 lb/sec
s
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