Short of Iran nuking Saudi Arabia, oil prices aren’t expected to recover to 2014 levels for a much, much longer time than just 2 years.
I have many friends in the oil industry and know that it hires plenty of people w mechanical engineering bachelor’s degrees, not just petroleum engineering degrees. Would make more sense for you to just get a mechanical engineering job when you graduate, and wait n see. You can always change jobs and enter the industry directly, when (and if) the industry recovers.
There’s little incremental worth in a masters in petroleum engineering.
I hope you’re not drawn to the industry just for money. The industry is a mega roller coaster, and over the last two decades, I’ve watched too many friends lose their job.