Gas Equations
Subtopics:
Metric Units
Typecurves  Dimensionless Variables
Radial Analysis
Flow Capacity 

Permeability 

Total Skin 

Pressure Drop Due to Skin 

Flow Efficiency 

Damage Ratio 

Radius of Investigation 

Linear Analysis
Fracture HalfLength 

Channel Width 

Skin Due to Xf 

Horizontal Well Analysis
Vertical Permeability 

Effective Wellbore Length * (Permeability in the ydirection)0.5 

Horizontal Permeability 

Note: Horizontal well length is in the xdirection.
Field Units
Typecurves  Dimensionless Variables
Radial Analysis
Flow Capacity 

Permeability 

Total Skin 

Pressure Drop due to Skin 

Flow Efficiency 

Damage Ratio 

Radius of Investigation 

Linear Analysis
Fracture HalfLength 

Channel Width 

Skin Due to Xf 

Bilinear Analysis
Fracture Conductivity 

Horizontal Well Analysis
Vertical Permeability 

Effective Wellbore Length * (Permeability in the ydirection)0.5 

Horizontal Permeability 

Note: Horizontal well length is in the xdirection