Please do not be disheartened but you will need to know somebody with some clout to get on the rigs, i know lads who have trained up to go out there and never got anywhere near them with comp-ex and rope access.
Theres a queue of guys wanting to go on them so they can take their pick up and nearly always past experience is essential.
You will be asked when your last trip was, you say never been out there before, and they will tell you that they will be in touch and they never ring!!!!!!!!!
A potential way in is starting in the gas yards in south wales and on the south coast. Make some contacts and worm your way in.
dont want to put a dampener on things
keep us informed of how you go on
matt