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自从推广外丝钻杆的先进经验以来，钻杆的磨耗已有很大的降低，基本上消除了折断钻具事故，这不仅降低了钻探成本，也提高了钻进效率，更重要的是节约了无缝钢管。根据实际使用情况来看，优点是很多的，不过我们队在使用过程中，因为外丝钻杆锁接头的直径比钻杆大15公厘，由于我们使用普通垫义，在下降钻具时，不可避免的钻具有很大的摆动，常造成外丝钻杆锁接头卡井口管的现象，轻者仅仅刮一下，重者把井口管打劈，有时也造成脱落钻具的事
Since the promotion of advanced experience with wire drills, drill pipe wear has been greatly reduced, basically eliminating the risk of breaking the drill, which not only reduces drilling costs, but also improves drilling efficiency, more importantly, savings Seamless steel pipe. According to the actual use of the point of view, the advantages are many, but our team is using the process, because the outer wire rod locking joint diameter 15 mm larger than the drill pipe, because we use the ordinary cushion meaning, when lowering the drill, Inevitable drill has a great swing, often resulting in the phenomenon of the outer wire rod lock joint card wellhead tube, the light only scratch, heavy pipehead pipe splitting, sometimes causing the drill off things