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Derrick and substructure are used to support and install various drilling equipment and tools and provide drilling operation site. The derrick is used to install the crown block, hanging traveling block, hook, faucet and drilling tool, bear the working load of drilling and discharge the stand; The substructure is used to install the power unit, drawworks, rotary table and support the derrick. The rotary table is used to suspend the drilling tools and provide the height space between the rotary table and the ground to install necessary blowout preventers and facilitate mud circulation.
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