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Drilling rig equipped with pairs of block and tackle systems
Drilling rig equipped with pairs of block and tackle systems
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机译:装备有成对的滑车系统的钻机
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摘要
This invention relates to drilling rigs, and more particularly to novel apparatus for supporting a plurality of pairs of block and tackle systems with the tackle systems of each pair operable sequentially and alternately, the one being used to support a main drilling or tubing string while the other is being used to rack stands of tubing therefrom.
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