Could be casing issues too. Could be getting hung up and requiring hole cleanouts or could be having trouble getting cement returns to surface, or poor cement bonding requiring remedial cement job.
No big deal though. Given that they are drilling on air, making sure the BOP is working fully and that the casing is cemented properly is critical, I would rather they take an extra few days to get it right, especially with the recent demonstration in the US of what can happen if a shoddy job is done.
o2 drilling update, page-4
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