It's hard to answer because it depends on whether the reservoir...

It's hard to answer because it depends on whether the reservoir they are targeting can be drained by existing wells or not.

if it can't then this is 25 PJ of new gas so it's worth a lot more than $8M NPV.

If it can then these wells are just being drilled to accelerate production, not add new production. That is quite common in oil & gas, it may seem counter-intuitive but due to discount factor spending money to get the same volume out quicker can actually make more money overall.

My feeling is that these wells are probably targeting crestal locations that can't be drained effectively by other wells so it's probably mostly new gas volume. It's gas that would be classified as 2P undeveloped. These wells will make it 2P developed.