This is the most common and well-known profession in petroleum engineering. Petroleum engineers design and implement methods to extract oil and gas from the earth, as well as develop new technologies to improve efficiency and reduce costs.

Reservoir engineers analyze data to determine the amount of oil and gas in a reservoir, as well as how it can be extracted. They also develop strategies to maximize recovery while minimizing environmental impact.

Drilling engineers oversee the drilling process, ensuring that wells are drilled safely and efficiently. They also develop drilling plans, manage drilling operations, and monitor well performance.

Production engineers oversee the production process, ensuring that oil and gas are extracted efficiently and economically. They also develop strategies to optimize production rates, reduce costs, and minimize environmental impact

Facilities engineers design, build, and operate the infrastructure required to transport and process oil and gas. They also develop strategies to improve efficiency, reduce costs, and minimize environmental impact.

HSE engineers ensure that oil and gas operations are conducted in a safe and environmentally responsible manner. They develop safety protocols, manage emergency response plans, and monitor compliance with regulatory requirements.