the industry can be a nightmare to get into, do you have a trade or any skills? you will also need mist training its a new thing they have brought in for new starts. you can also go down the service companys route which means if you like being at home then dont apply. if you want a steady 2on 2 off then try the drilling companys or like said all the big ones if you have a skill all the better. it looks like it will be picking up a bit this year so it could be a gd time just keep in at the agencies also.
try seawell, kca deutag, global resources, atlantic resourcing, offshore marine services, they seem to be taking on at the mo last 3 are agencies.