RE: RE: RE: Pore Pressure Profile Check out the attached video - https://www.agr.com/technology/enhanced-drilling-solutions/ec-drill----managed-pressure-drilling-system While this video is directed towad Managed Pressure Drilling it should be helpful in that it outlines how the operator (i.e. Repsol) would go about putting a well plan together.
Starting at about :23 second you can see an outline of the 'pore pressure' and 'fracture gradients'. When you get to :37 seconds - this is what danblasco is trying describe. The window between 'pore pressure' and 'fracture gradient' is extremely small. HPHT wells often have troublesome area like these where your window is extremely small to drill through.
It is likely that Repsol encountered something very similar to what is desribed in the video at :37 second and made the judgement call to abandon the well. Moving forward - they wanted to come back with a fresh well design that takes into account this problem zone and re-drill the well.
Hope this helps....