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Assessment of drilling deviations in underground operations

机译：评估地下作业中的钻探偏差

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At present, modern jumbos equipped with MWD (Measure While Drilling) provide the position of the blastholes collar and, from the drill length and the azimuth and inclination angles (monitored outside the blasthole), the theoretical end position of the blasthole. Since the trajectory of the hole during the drill is not measured, deviations are not accounted with the result that the actual spatial position of the blasthole is unknown. This paper investigates the quality of the drilling in underground blasting operations with a view to quantify the distance of the position assessed by the MWD system with respect to the actual end position of the blasthole logged. For that, a Pulsar Micro Probe Mk3 has been used to measure the actual trajectory of several production blastholes, drilled in semi-automatic mode, by measuring inclination and azimuth values at 1 m intervals. The results indicate significant deviations between the actual end position of the blastholes and the end position given by the MWD system. Deviation measurements are compared with the MWD parameters. This points out that possible disturbance zones in the rock, indicated by peaks and drops in the variability of the rotation pressure and in the signals of feed and hammer pressure, are correlated with changes in the blasthole trajectory.
机译：目前，配备MWD（随钻测量）的现代小型飞机提供了炮眼轴环的位置，并根据钻头的长度，方位角和倾斜角（在炮眼外部进行监控）提供了炮眼的理论终点位置。由于未测量钻孔过程中孔的轨迹，因此未考虑偏差，结果是，炮孔的实际空间位置未知。本文研究地下爆破作业中的钻孔质量，以量化随钻测井系统评估的位置相对于测井爆破孔的实际最终位置的距离。为此，已使用Pulsar Micro Probe Mk3通过以1μm的间隔测量倾斜度和方位角值来测量在半自动模式下钻出的几个生产爆破孔的实际轨迹。结果表明，炮眼的实际终点位置与MWD系统给出的终点位置之间存在明显偏差。将偏差测量值与MWD参数进行比较。这指出，岩石中可能存在的扰动区域，由旋转压力的变化性以及进料和锤击压力信号的峰值和下降指示，与爆破孔轨迹的变化相关。

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