bottom logger
... bottom log interval测量井段底部深度 bottom logger测井井底深度 bottom longitudinal底部纵材;底部纵骨 ...
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... bkt 支架 bl 测井井底深度 bl 基本负荷 ...
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除此之外,考虑到在下入测井工具之前可能降低井眼有效深度的井底碎屑、井眼充填和其它条件,通常还要钻进一段额外井眼。
In addition, there is usually a small amount of extra hole drilled to allow for junk, hole fill-in and other conditions that may reduce the effective depth of the well prior to running logging tools.
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