Aramis is a good company, provides good trainings for their people, or from what I heard. I have had friends working there and others gotten job offer from there. Don't worry, it is a legit company.

I couldn't provide much info on their current project.
It is a consulting company in the o&g field, but it's more to turn-key, project management, drafting/writing manuals for offshore procedures and such. Regarding the working period... I do have friends who did their internship with them, but I haven't got around to asking them about it yet. But such cases often occur in many MNC, where contractors are converted into permanent workers, it is common. But of course, it all base on your performance. It is often not a promise to make you permanent, but rather, depends on your performance.