Hi All experienced person here..... Can give me some advise?

I'm a fresh grad holding a Master in Engineering in Mechanical Engineering(Honours) from University of Nottingham. I just started working for 3 months as a Sales Engineer at a ESD manufacturing company from Singapore for Semicon industry. I'm still under probation for 6 months, 3 more to go. (Previously I've chosen this position over a R&D engineer in Panasonic A/C Malaysia because having higher pay and benefits here)

I felt a bit wasted to work as sales engineer, and wonder how far can I go in this job. How do you guys advise me? I really thinking of venturing into O&G industry, but I have not contacts at all around me. Nobody into this field, anyone here can provide me details and intro pls?? Your advice is very much appreciated.