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。
In order to reveal the characteristics of rock breaking process with double bits’self-balancing and synchronous reverse rotation.In this paper,through theoretical calculation,numerical simulation and hole wall morphology analysis,the rock fragmentation characteristics of dual impregnated diamond bit and single impregnated diamond bit are compared and studied.The simulation data show that show that that the double bits present bidirectional small step double screw drilling at the bottom of the hole,while the single bit presents unidirectional small step spiral drilling;due to the reverse rotation of the inner and outer bits of the double impregnated diamond bit,the rock fragmentation characteristics of the single impregnated diamond bit are compared The experiment data show that the torque balance effect on the bottom rock is smaller,the disturbance to the formation is weaker,and the hole wall is more smooth and stable;the double bit produces more stress concentration points for the rock at the bottom of the hole,the maximum stress value is 114.7%of the single bit,and the axial displacement is 121.7%of the single bit,which indicates that the double bit is more likely to break the rock.The research results provide theoretical support for the research of double bit self balanced drilling.
作者
高科
陈杭凯
许晓慧
高红通
谢晓波
闫立鹏
GAO Ke;CHEN Hang-kai;XU Xiao-hui;GAO Hong-tong;XIE Xiao-bo;YAN Li-peng(College of Construction Engineering,Jilin University,Changchun 130021,China;Xian Research Institute Co.,Ltd.,China Coal Technology and Engineering Group Corp,Xi'an 710077,China;Nuclear Industry Brigade 208,Baotou 014010,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2021年第3期866-874,共9页
Journal of Jilin University:Engineering and Technology Edition
基金
国家重点研发计划项目(2018YFC0808201-4)
广州海洋地质调查局项目(DD20190584)。
关键词
孕镶金刚石钻头
自平衡
双钻头
破岩性能
逆向回转
impregnated diamond bit
self-balancing
double bits
rock fragmentation characteristics
reverse rotation
