Cased hole Formation resistivity Logging (CHFR) is a new resistivity tool in cased holes developed by Schlumberger company.

过套管地层电阻率测井(CHFR)是斯伦贝谢公司的一种新的套管井电阻率测井仪器。

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As far as cased-hole formation resistivity logging, the key problems needed to be solved are detection of ultra-low frequency and extremely weak signals, as well as reduction of strong interferences.

超低频、纳伏级信号的检测以及强干扰的抑制是过套管地层电阻率测井需要解决的关键问题。

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Casing resistivity logging is hard to realize because of the strong hindering effect of casing to electrical current and only feeble current can enter the formation.

套管井中，由于套管对电流的强阻隔作用，只有极其微弱的电流可以进入地层，使得过套管电阻率测井很难实现。

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