I'm sorry to say this, but 500 hours of experience just isn't enough to survive in the Gulf, both literally and metaphorically speaking.
It's not an especially difficult job, but it does require you to be able to put it all together: weather knowledge, aircraft familiarity, flying skills, administrative skills, customer service, efficiency, productivity and most importantly; common sense.
500 hours of experience roughly equates to a six-month stint as a flight instructor at a busy flight school. Which is not enough time to master all of the above skills sufficiently.
I respectfully submit that you'll need around 1,500 hours of experience, and that reputable offshore companies will tend to think so, too.