generally a mechanical issue related with either the rams or seals on the BOP. If its not maintaining pressure then its not sealing well.
The one on the rig should b rated at 10/15000 psi, see link for specs.
I don't blame ENI for not drilling ahead, safety matters more in this sector.
http://www.enscoplc.com/Theme/Ensco/files/docs_rigspecs/ENSCO%20107.pdf
generally a mechanical issue related with either the rams or...
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