Why is oil drilling a very hard but lucrative business

It is because of some of the costs involved: Payments for the contractors, welders, engineers, supervisors, mud loggers, geologists, scientists. Personnel for drilling, logging, cementing, casing and other logistics.Oil mining is rigorous and requires physical labor and long hours. An average oil rig worker can work shifts exceeding 8 hours for 7 to 14 days in a row. As they deal with the heavy machinery and equipment used on a rig, crews can experience the dangers of fatigue.

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Women, slaves (african americans), and native americans.