The average annual salary for petroleum engineers is about $130,000, according to the BLS, making this one of the highest paying engineering jobs. The highest 10 percent in this field earn over $187,000 per year. The most lucrative industries are oil and gas extraction, enterprise management, architectural services, and petroleum products manufacturing. Petroleum engineers tend to work longer hours, with typical weeks lasting 50 to 60 hours of work. Much of this extra time can be attributed to travel to and from work sites for regular or emergency visits. When working onsite, petroleum engineers often rotate, with 84 hours on duty followed by 84 hours off duty.