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  • In oil-drilling, a work shift of a drilling crew. Drilling operations usually occur around the clock because of the cost to rent a rig. As a result, there are usually two separate crews working twelve-hour tours to keep the operation going. Some companies prefer three eight-hour tours. The graveyard tour is the overnight shift or the shift that begins at midnight. (From Schlumberger Oilfield Glossary)

    June 10, 2008