Evaluation of formation drill-ability anisotropy has important effect for preventing deviation of straight holes and planning drilling trajectories of directional Wells.

地层可钻性各向异性评价在直井防斜以及定向井井眼轨迹控制中具有重要的意义。

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This paper analyzed the problems of the belt deviation for belt conveyor of the underground coal-mining, and summarized the corrective method for preventing the belt deviation of the belt conveyor.

针对煤矿井下胶带输送机胶带跑偏问题进行了分析，总结出了输送机胶带防止跑偏的防治方法，对胶带输送机在现场的使用和维护具有一定的实用价值。

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