钻达20英寸套管深度时，用高粘度泥浆替满井眼。
When 20 "casing depth is attained, displace hole volume with high viscosity mud."
利用套管柱上的已知的基准点来确认或对比处理深度所用的井下仪器。
A downhole tool used to confirm or correlate treatment depth using known reference points on the casing string.
在电磁流量计测井中，套管的接箍曲线作为常规的测井资料进行测量，用于测井曲线深度校正。
In the electromagnetism flowmeter logging, the casing collar curve is ordinary logging parameter for rectifying logging data depth.
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