good prepare cv and project
1 well engineer managing the oil and gas wells.
2 process engineer managing operation (24X7 job) of a process plant/refinery.
3 process engineer managing process maintenance (maintaining process equipment like vessel column pipe line etc.
4 pipe line engineer managing pipeline , maintenance operation and commissioning etc
5 well services engineer doing work over, well testing, other well services.
6 downstream process engineer maintaining the production of a bunch of wells storage transportation of oil & gas etc.
7 R&D engineer doing optimization and simulation etc of existing/new plant acting as in house expert/consultant for production/process related issues/problems.
8 doing administrative/desk job like contract management or production/process data management.
9 HSE profile.
and some other also so its safe to say that you may get very different and varied possible profile with possibility of interchange between them during your career path.
Good luck