Entry-level oil refinery jobs focus on the operations and process of turning crude oil into market-ready petroleum products such as gas. As an entry-level oil refinery worker, your responsibilities vary depending on your area of specialization. For example, as an entry-level operations worker, you may help manage the flow of fluid through the refinery. Or, you may work as an apprentice for several years before earning journeyman status. Other apprentice positions include pipefitters, control panel and pump system operators, and truck drivers. Entry-level engineers help maintain the refinery system and perform quality control duties that involve sample collection and testing.