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.
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。
On this basis, the difference between the limited lift by vacuum pumping and the effective depth of vacuum preloading is analyzed and the reason of the latter may greater than the former is analyzed.
在此基础上，比较了真空提水的极限深度和真空预压有效加固深度的不同，分析了真空预压有效加固深度大于真空提水极限深度的原因。
On this basis, the difference between the limited lift by vacuum pumping and the effective depth of vacuum preloading is analyzed and the reason of the latter may greater than the former is analyzed.
在此基础上，比较了真空提水的极限深度和真空预压有效加固深度的不同，分析了真空预压有效加固深度大于真空提水极限深度的原因。
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