Page 485 - Air and Gas Drilling Manual

10-10 Air and Gas Drilling Manual
Also, determine the bottomhole annulus pressure and annulus foam quality while
drilling at 10,000 ft (i.e., an annulus minimum foam quality of approximately 0.60).

Figure 10-2: Illustrative Example 10.1 casing and openhole well geometric
configuration.

Table 4-1 gives an average atmospheric pressure of 12.685 psia for a surface
location of 4,000 ft above sea level (mid latitudes North America) (also see
Appendix D). The actual atmospheric pressure for the air at the drilling location
(that will be used by the compressor), P at, is

p 12 685 psia
.
at
P at p 144
at
2
.
,
P 1 826 6 lb/ft abs
at
The actual atmospheric temperature of the air at the drilling location (that will be
used by the compressor), T at, is