摘要
针对反井钻机导孔定向钻进在不良地质段易发生围岩失稳导致的卡钻、塌孔问题,通过理论计算和ANSYS Workbench数值模拟的方法,分析了定向纠偏过程中翼板与井帮围岩接触应力的影响因素及规律,探讨了井帮围岩变形特征,提出了适用于反井钻机旋转定向钻进的井帮围岩稳定控制技术。研究结果表明:15°+30°组合倒角翼板结构,较普通倒角结构在降低接触应力及围岩变形方面优化效果显著。当反井导孔遇不良地质时,采用动态调整钻进参数、合理设置导向力分配方案、优化翼板结构的井帮围岩稳定控制技术能够有效降低翼板陷入井帮引发卡钻、埋钻事故的风险。研究结果可为软弱地层反井工程提供一定参考。
In unfavorable geology,pilot hole drilling of raise boring machines is often susceptible to sticking and hole collapse due to the instability of the surrounding rock.This study presents a coupled mechanical model of a steerable rib and borehole to investigate the influencing factors and rules of contact stress and the deformation characteristics of surrounding rock during directional deviation correction.The study also proposes a stability control technology for surrounding rock in rotary directional drilling of raise boring machines.Theoretical calculations and ANSYS Work-bench numerical simulations were performed to evaluate the effectiveness of 15°+30°chamfers,which are found to be better than normal chamfers in reducing contact stress and deformation of surrounding rock.The surrounding rock stability technology,including dynamic drilling parameters,reasonable distribution of guiding force,and optimized rib structures,can effectively reduce the risk of sticking and hole collapse caused by steerable ribs falling into the borehole in unfavorable geology.This research provides valuable insights for raise boring projects in soft strata.
作者
刘文敬
程守业
荆国业
LIU Wenjing;CHENG Shouye;JING Guoye(China Coal Research Institute,Beijing 100013,China;Beijing China Coal Mine Engineering Co.,Ltd.,Beijing 100013,China;Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China)
出处
《采矿与岩层控制工程学报》
北大核心
2023年第2期71-79,共9页
Journal of Mining and Strata Control Engineering
基金
国家重点研发计划资助项目(2016YFC0600802)
天地科技股份有限公司科技创新创业资金专项产学研科技合作项目(2019-TD-2-CXY008)。
关键词
反井钻机
旋转定向钻具
接触应力
围岩稳定
raise boring machine
rotary directional drilling tool
contact stress
surrounding rock stability
作者简介
刘文敬(1998—),女,内蒙古赤峰人,硕士研究生,主要从事机械破岩与钻井法凿井理论与技术等方面的研究工作。E-mail:1486753150@qq.com。
