In addition to preparing you for lucrative positions, extra education or training in petroleum engineering enhances your abilities and broadens your understanding of how to create vehicles that are better, faster, safer, cleaner, and more environmentally friendly.
A master’s degree in petroleum engineering will give you the strategic skills you need, including:

Knowledge of the conduct of petroleum research in:
Geomechanics, production, and studies of hydraulic fracturing reservoirs.
Re-crushing to optimize production from unconventional shale.
Data-driven modeling in unconventional reservoirs.
Petrophysical and geochemical analysis of shale oil.
Geophysics and seismic analysis of unconventional reservoirs.
Computer-Aided Design
AutoCAD
Solidworks, CAD
Creo Elements / Pro, computer-assisted
Finite element methods

Source: [https://allstudyguide.com/online-masters-in-petroleum-engineering/]