Not much oil rushes out of the ground on its own. Engineers have to pick the right extraction method, such as the injection of water, chemicals, gases or steam. Or they might decide to use computer-controlled drilling. With current methods, some oil gets left in the reservoirs. Some drilling engineers spend time researching and developing better ways to increase oil production, and to reduce the high price of drilling.
Most engineers work in an office setting or in a laboratory.
However, many petroleum and drilling engineers spend time at oil and gas exploration sites. These engineers are hired by the major oil companies, smaller independent exploration companies, engineering consulting firms and government agencies. Some work as independent consultants. Engineers work a standard 40-hour week. However, deadlines or working out at an exploration site may mean longer hours and some weekend work.