Methane leaks are often by design when it's an oil well.
That's why you need to enforce flaring (burning the methane and releasing CO2 into the atmosphere) because that's better than simply venting the methane.
> Gas venting, more specifically known as natural-gas venting or methane venting, is the intentional and controlled release of gases containing alkane hydrocarbons - predominately methane - into Earth's atmosphere. It is a widely used method for disposal of unwanted gases which are produced during the extraction of coal and crude oil. Such gases may lack value when they are not recyclable into the production process, have no export route to consumer markets, or are surplus to near-term demand.
