Page 231 - Air and Gas Drilling Manual

P
at
at
,
P
= 1 967 lb/ft abs
at = p 144 2 Chapter 5: Shallow Well Drilling Applications 5-73
The atmospheric temperature of the air, T at, entering the compressor is
o
t at = 80 F
T at = t at + 459 67
.
o
.
T = 539 67 R
at
Thus, P g and T g become
P = P = 1 967 lb/ft abs
2
,
g at
T = T = 539 67 R
o
.
g at
Using Equation 4-11, the specific weight of the atmospheric air entering the
compressor is
(1 967, ) (1 0. )
γ g =
(53 36. ) (539 67. )
γ g = 0 0683 lb/ft 3
.

The volumetric flow rate of air entering the compressor, Q g, is
,
Q g = 1 200
60
3
.
Q g = 20 0 ft /sec
The weight rate of flow of air through the well is
˙ w = . 0 0683 (20 0
. )
g
˙ w = . 1 366 lb/sec
g
The borehole diameter, D h, is