吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (3): 866-874.doi: 10.13229/j.cnki.jdxbgxb20200542
高科1(),陈杭凯1,许晓慧1,高红通2,谢晓波1(),闫立鹏3
Ke GAO1(),Hang-kai CHEN1,Xiao-hui XU1,Hong-tong GAO2,Xiao-bo XIE1(),Li-peng YAN3
摘要:
为了揭示双钻头自平衡同步逆向回转的破岩特性,采用理论计算和数值模拟等方法,对比研究了双孕镶金刚石钻头同步逆向回转和单孕镶金刚石钻头单向回转的破岩特征,得出如下结论:双钻头在孔底呈现双向小台阶双螺旋钻进,而单钻头则呈现单向小台阶螺旋钻进;由于双钻头的内、外钻头逆向回转产生了扭矩平衡作用,对孔底岩石的作用合力更小,对地层的扰动更弱。通过室内试验对比研究得出:双钻头逆向回转情况下,孔壁更光滑、稳定;双钻头对孔底岩石能产生更多的应力集中点,且磨损较单钻头更为均匀,具有更长的使用寿命;双钻头在同等钻进参数下,钻速更快,说明双钻头更容易破岩。本文研究成果可为双钻头自平衡钻进技术的研究提供理论支撑。
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