The Methane Issue
Emissions of Methane, the major component of Natural Gas, is gaining increased attention worldwide because of its effects on global warming. Pound for pound, Methane is 25 times as potent as the more recognized greenhouse gas, Carbon Dioxide, over a 100-year period with the short term effects being much more pronounced.
A significant source of methane gas emissions is Surface Casing Vents/Casing Head Vents which are not large individually but significant in aggregate. a pictorial description follows:
Surface Casing Vent Flows: