Such problems must be highlighted because they are directly related to downhole safety and drilling efficiency.
该问题直接涉及井下安全和钻井效率，必须予以高度重视。
The structure design, working principle, features, field test and application of the downhole safety control system are introduced in this article.
本文介绍井下安全控制系统的结构设计，工作原理，特点，现场试验和应用情况。
Stabilizer is not used or used seldom in gas drilling to ensure the downhole safety. At this time, bottom-hole assembly bends easily resulted in well deviation.
为保证井下安全，气体钻井常常不使用或少使用稳定器，此时钻具组合更易发生弯曲而引起井斜。
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