ECP/DV Tool to prevent gas migration the 9-5/8" x 13-3/8 annulus?

Hess Libya is drilling a deepwater subsea well that has the potential to experience significant losses when cementing our pay zone behind 9-5/8" casing. Our concern is that if the pay zone is not fully isolated, gas may migrate up the 9-5/8" x 13-3/8" annulus. We are looking for mechanical options for isolating the 9-5/8" x 13-3/8" annulus after the cement job to prevent gas migration.

1. Has any one used an ECP / DV tool in subsea applications and if so, could you share the generalized information on how you functioned the tool and which company supplied the equipment.

2. Has anyone used Swell Packers on 9-5/8" casing x 12-1/4" hole or 9-5/8 " casing x 13-3/8" casing for this purpose? If so, which company provided the equipment and how reliable was the performance of the equipment?

3. Any other mechanical options that the forum would recommend? We are looking at running the 9-5/8" as a liner as well, but this is not our preferred option at this point.

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