Oseia, a 27-year-old from Milne Bay Province, was chosen above eight other contestants from industrial, mining and petroleum companies to claim the honour.
She also won the internal Oil Search Apprentice of the Year after her project ‘Gas Dehydration' was judged as the winning project and was selected to represent Oil Search at the national title.
"It is a sense of satisfaction as it's a dream come true for me since I first heard of the NATTB Awards of the Year event," Oseia said.
"Being considered for this year's top award is a way I can encourage more women to showcase their potential in this kind of event and ply their trade at their workplaces. To represent Oil Search in this event is an honour and privilege for me and I will remember this experience and award for the rest of my life," she added.
She is based at the company's Central Processing Facility (CPF) in Kutubu and was one of the two women who represented their respective organisation to compete with the other men apprentices.
Oil Search training coordinator Ian Fraser said the company was impressed with Oseia's performance and theat she always gave her best.
"We are happy to have her represent Oil Search. She is a very talented process technician and this award will definitely go down as one of the highlights in 2018 for the company and it will strengthen our commitment to train national and contribute towards the PNG's human resource development," Fraser said.