Mark,
If you want to work in the oil industry you have two options dependant upon your skills and qualifications. Think of it this way most platforms and rigs have most of the services that would keep a small town running such as catering, power generation, aviation, medical services as well as the actual drilling and production of oil and gas.
Firstly if you have a relevant degree (geology, mechanical engineering, electrical engineering, chief, maybe computing) then I suggest that you approach companies that provide services to the oil rigs, try a google search on ‘Oil field service companies’ this should yield names such as Baker Atlas, Halliburton, Schlumberger, Expro……etc. then approach these companies direct with your CV.
The second option if you think your skills are not relevant is to approach the rig operators try a google search for ‘roustabouts, roughnecks, oild field drillers’ with this option you will be aiming to go in at a low skill level and basically spend a few years running around doing the most meanial of tasks, if however you are remotely intelligent, which I think you probably are you will find it quite easy to climb up the ladder to a more important position.
Some companies may express an interest if you have your offshore survival certificates, to find out more search for ‘Petrofac or RGIT’
http://www.petrofactraining.com/training-services/default.asp
Initially which ever route you take the work will be relatively low paid, recently there has been an influx of low skilled people choosing to try out offshore life, so it may be hard to initially get in, but if you have the right aptitude then you can quickly become highly skilled and well paid. Most companies also offer generous training so you can always further your career.
Initially I started with Halliburton as a Geologist, quickly moved on to a smaller geological company with a better reputation, then after quitting to study for a masters Joined shell as a Petrophysicist. Now, in my 7th year of the industry Im a consultant developing multiple oils and gas fields for a variety of investement companies on a global scale.
PM me if you want any further advice.
R