Depth measurements are commonly referenced to the KB, such as 8327 ft KB, meaning 8327 feet below the kelly bushing.
井深测量通常是指方钻杆补心高度，如补心高度8327英尺，就意味着在方钻杆补心以下有8327英尺的深度。
Depth measurements are commonly referenced to the KB, such as 8327 ft KB, meaning 8327 feet below the kelly bushing.
井深测量通常是指方钻杆补心高度，如补心高度8327英尺，就意味着在方钻杆补心以下有8327英尺的深度。
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