Hello there ,
Oil technology is somehow related to petroleum services all over the world.
A person specializing in oil technology researches, designs, develops repairs and evaluates precision machineries used to locate, extract, process and refine natural gas and petroleum. In addition, oil technologists look after the vast array of equipments processes and systems used to process, refine, transport and store oil and oil products. They also take care of the environment, waste disposal and the associated safety systems.

I hope this helps.
Regards
Madhur