International Oil companies in Qatar do not care about your nationality, some of them have a Qatarization target and would like to employ more Qataris (Qatari mother does not count).

It depends on your skills, it would be difficult to employ you if you have no experience (straight out of school) for a non-Qatari, unless you are very talented in what you do. Requirements in O&G companies are much more stringent when compared to other companies - they want the biggest bang for their buck.

I would also work on my English skills.