2. Oriented case overshot for
sidetrack drilling tech is a main component in down hole work-over operation.
定向套管开窗侧钻技术已成为井下大修作业的重要组成部分。
3. Some new logging problems have appeared because horizontal, extended reach and
sidetrack wells have been widely drilled in recent years.
近年来油田采用一些大斜度定向井、老井开窗侧钻井等钻井技术,测井面临如何作业的新问题。