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A drilling rig is the surface equipment used in the drilling of oil and gas wells. A typical drilling rig is made up of a derrick and a winch for lifting and lowering the drill string, a rotary table to turn the drill pipe, and engines to drive the winch and rotary tables. Some drilling rigs are designed to be mobile while others are fixed and stationary. There are different types of drilling rigs used both on land and in offshore drilling operations. Mobile rigs are considered to be more cost-effective, particularly in the drilling of offshore exploratory oil wells. Some of the different types of drilling rigs include:
