Page 219 -

Gas and Liquid Injection Rates 181

Pipe roughness: 0.0018 in
Borehole roughness: 0.1 in
Environment
Site elevation (above mean sea level): 50 ft
Ambient pressure: 14.7 psia
Ambient temperature: 60 F
Relative humidity: 0.1 fraction
Geothermal gradient: 0.01 F/ft
Friction tuning factor: 8
Operating conditions
Surface choke/flow line pressure: 14.7 psia
Rate of penetration: 120 ft/hour
Gas injection rate: 560 scfm
Liquid injection rate: 275 gpm
Formation water influx rate: 1 bbl/hour
Formation oil influx rate: 1 bbl/hour
Bit orifices: 20-1/32nd in
20-1/32nd in
20-1/32nd in
Solution
This problem can be solved with computer program AliqDrill-09.xls. The results
are shown in Figures 9.2 through 9.6.
Pressure (psia)
0 500 1000 1500 2000 2500 3000
0
1000
2000

3000
Depth (ft) 4000

5000

6000
7000
Annular profile
8000
In-pipe profile
9000
Figure 9.2 Calculated pressure profile along the flow path.
(Continued )