An oil field lease operator oversees pumping operations at a well owned by an oil and gas company. In this career, you monitor the pump and other equipment to make sure they are operating correctly. Your duties include using meters and instruments to record daily extraction amounts, repairing machinery and troubleshooting when problems arise during production. As a lease operator, your responsibilities include making repairs or arranging for repairs. Modern pumping operations rely on sensors and computer systems to monitor extraction activities. You typically use these computers to assess production and check for problems.