The principles and purpose of the Formation Evaluation Tool (FET) will be briefly introduced and successful examples of the application of the technology will be described in detail in this paper.
本文主要介绍地层测试评价仪（FET）的原理和用途，以及在中国海域的成功应用实例。
In formation evaluation slowness-time coherence is used in conjunction with an array-sonic tool in which the full waveforms at each receiver have been recorded.
在地层评价中，时差相关技术用于阵列声波测井中，阵列声波测井仪的每一个接收器都记录全波列信号。
The tool also can be used for evaluation of formation oil saturation and formation flooding degree perfectly in an old producing well.
在已投入生产的老油井中，能够较好地评价储层的剩余油饱和度及水淹程度；
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