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There's still lots of dusters in offshore exploration and failures or long delays for planned production wells.
Then once you've got a viable well drilled, you need a production Tree on top of it and then carry out a set of flow tests.. If the flow tests are good, tie the Tree into a manifold and risers to an FPSO. Or link it to a pipeline back to shore.
The costs are bonkers and a only make sense if the oil/gas price is high enough to cover the actual flow rate to surface (not the paper project expected flow rate)
80,000 a day is relatively cheap compared to offshore rates.
Price up a rig, third party crew, support vessel etc....
Gets very expensive over the winter season. A few years ago, we had two days drilling, out of a 21 day shift due to weather being out of limits.