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以煤系顶板泥岩层为研究对象,对不同抗压强度的泥岩层钻孔施工过程中不同推力水平下的钻进反馈信号进行现场试验研究,结果表明:1)试验条件下泥岩钻进全过程推力-钻速特征曲线分区明显,可划分为研磨区、钻削区、阻塞区,推力达一定值时由研磨区跃迁至钻削区,过渡区不明显;2)钻削区内钻速随推力增大呈近似线性增加,功耗最小,为钻机工作的最优区域;3)阻塞区内并非钻速增长率减小而是钻速负增长,钻速随推力的增加而减小,达某一推力水平时钻速骤降为零;4)相同推力水平下,钻进速度与泥岩强度呈负指数关系,泥岩强度增加时,推力-钻速特征曲线表现为钻削区、阻塞区右移,推力区间增加,曲线峰值降低,峰值位置右移且趋于平缓。
Taking the coal seam top mudstone as the research object, the drilling feedback signals under different thrust levels during the drilling process of mudstone rock layers with different compressive strength were field tested. The results show that: 1) the whole process of mudstone drilling Thrust-ROP characteristic curve is obviously divided and can be divided into grinding zone, drilling zone and blocking zone. When the thrust reaches a certain value, it jumps from the grinding zone to the drilling zone, and the transition zone is not obvious. 2) The thrust increase is approximately linear increase, and the power consumption is the smallest, which is the optimal area for drilling rig work. 3) The growth rate of ROP is not decreased, but the penetration rate is negative, but the drilling rate decreases with the increase of thrust, The drilling speed suddenly drops to zero at a thrust level; 4) Under the same thrust level, the drilling speed and mudstone strength show a negative exponential relationship, and when the mudstone strength increases, the thrust-drilling speed characteristic curve shows the drilling zone and the blocking zone moves to the right , The thrust interval increases, the peak value of the curve decreases, the peak position moves to the right and tends to be gentle.