Petroleum engineering is a field of engineering concerned with the activities related to the production of hydrocarbons, which can be either crude oil or natural gas. Exploration and production are deemed to fall within the upstream sector of the oil and gas industry.
Study the systems and technologies used to maximize petroleum production from reservoir to surface facilities
RE is the application of engineering principles for evaluating and managing reservoirs. this discipline is devoted to evaluating field performance.

Drilling engineering is the science behind the wells that produce oil and gas. Drilling engineering involves the planning, costing, developing and supervising of oil and gas well operations. Drilling engineering usually involves temporarily intense projects related to well design, testing and completion. 

This digitalization of the oil field is exciting, but it is only an enabling step. An effective digitalization requires more than meets the eye. It is much more than data-enabling and industrial internet of things (IIoT)-enabling machines. It involves instrumenting and collecting broader sets of information to achieve process insights.

There are a variety of ways of turning waste into energy. The most popular is to burn the waste and use the heat to raise steam and drive a steam turbine. Plants that carry this out include fixed and moving grate combustors and fluidized bed combustion systems. Waste can also be gasified, converting it into a combustible gas that can be used in a variety of ways. A similar technique is pyrolysis which can produce liquid or gaseous fuels depending upon the temperature at which it operates. Other systems can be used for organic and agricultural wastes including anaerobic digestion, the same process that occurs in landfill sites. Where waste is burnt, extensive flue gas cleaning systems are required to ensure no toxic materials enter the environment.