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110 Part II Gas Drilling Systems
Rotary
Hose Standpipe
Swivel
Gas
Compressor
Kelly Pipe
Injection Line
Rotating Head
Drill Pipe
Blooey Line
Borehole
Drill Collar
Drill Bit
Figure 5.1 A typical gas injection system.
Mist
Water Booster Compressors
Foamer
To Pump Unit
Kelly
Hose
Valve Manifold
Standpipe Optional
Air Flow Meter Low-
To Secondary Jet To Primary Jet High-Pressure Pressure
Header
Vent
Line
Bleed-Off Blowdown Vent Line
Line
Figure 5.2 A layout of the surface equipment in an air drilling system.
