Under the former mode, the cost of developing the shallow sea oilfield is very high. The long displacement well drilling technology is an effective way to solve this problem.
在以往的模式下，滩海石油开发成本较高，大位移钻井技术是解决这一问题的一种有效途径。
The downhole closed-loop drilling technology is a new developing technology. It is indispensable to the success of extended reach well.
井下闭环钻井技术是近年来在国内外得到普遍重视的新技术，是大位移井钻井必不可少的技术。
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