surveying collar
... 测量用变压器 measuring transformer ; potential transformer 测量用钻铤 surveying collar 测量用罗盘仪 surveyor'sdial ...
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随钻测量用钻铤 MWD collar
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与双感应测井类似的一种测井方法，用安装在钻铤中的电磁传播仪进行测量。
A log similar to a dual induction log but made by an electromagnetic propagation tool built into a drill collar.
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