This paper deals with the mechanism of bypass channel and mainly discusses the theory, technics and interpretation method of using neutron Lifetime Log(NLL)to evaluate channeling.

文中分析了管外窜槽的形成机理，重点介绍了注硼中子寿命测井技术用于管外窜槽监测的原理、工艺及解释方法。

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This log has been replaced by the neutron -lifetime and neutron-decay-time logs.

氯测井已经被中子寿命测井和热衰减时间测井所代替。

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