钻探工程2024，Vol.51Issue(2)：47-52,6.DOI:10.12143/j.ztgc.2024.02.007
复杂地层顺层定向钻孔轨迹设计方法优化
Optimization of directional drilling path design method in complex formation
摘要
Abstract
The M6 coal seam in Jintai Coal Mine has complex occurrence characteristics such as roof and floor breakage,apparent dip angle controlled by double dip angle(XZ view inclination 17°,YZ view inclination 3°),thin seam thickness(1.08～1.68m)and large variation in thickness.In the construction of directional drilling along strata,there are some problems such as difficulty of actual control,easy deviation from coal seam into unstable roof and floor,lower construction efficiency and ineffective penetration in multi-branch hole construction.Based on the calculation formula of apparent dip angle,this paper introduces the dip angle parameter of borehole along the working face to optimize the trajectory design method for the plane turning section of borehole,and carries out the verification test in Jintai Coal mine.The results show that:Compared with the original trajectory design method,the optimized trajectory design method can keep the borehole drilling along the middle of the coal seam,overcome the interference of the thickness change of the coal seam,and realize the accurate drilling along the coal seam of the plane turning section of the borehole,and the effective footage rates are 48.82% ,76.72% and 100% ,respectively.The gas monitoring data of test borehole No.8～10 show good gas extraction effect.关键词
煤层产状/顺层钻孔/定向钻孔/钻孔轨迹设计/瓦斯抽采Key words
occurrence of coal seam/bedding drilling/directional drilling/design of drilling holes track/methane extraction分类
地质学引用本文复制引用
李笔文,叶嗣暄..复杂地层顺层定向钻孔轨迹设计方法优化[J].钻探工程,2024,51(2):47-52,6.基金项目
陕西省自然科学基础研究计划项目(编号:2023-JC-YB-341) （编号:2023-JC-YB-341）
中煤科工西安研究院(集团)有限公司科技创新基金项目(编号:2022XAYKF01-01). （集团）
