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在地层不太完整的情况下,小口径钻进用双管取心,不仅能有效地保护岩、矿心不被冲蚀,获得较高的采取率,保证工程质量,同时还能减少钻头振动,从而增加回次进尺,提高钻进效率,延长钻头使用寿命,减少金刚石消耗.最初,曾采用仿D-10型双管钻进,使破碎地层的岩、矿心采取率有了提高,但钻具发生折断难以处理.为此,我们分析了各种单动双管的结构特点和存在问题,设计加工了球型轴承单动双管,经两年来的生产使用,钻进五千八百多米,累计近
In the case of less complete strata, small diameter drilling with double tube coring not only can effectively protect the rock, the core is not erosion, get a higher adoption rate to ensure the quality of the project, but also reduce bit vibration , So as to increase the retracting footage, improve the drilling efficiency, prolong the service life of the drill bit and reduce the diamond consumption.First, the use of imitation D-10 double-tube drilling, the broken rock formation, the core mining rate has been increased, For this reason, we analyzed the structural characteristics and existing problems of all kinds of single action double pipe, designed and processed ball bearing single action double pipe, after two years of production and use, drilling five thousand eight hundred Multi-meter, total close