为了研究钻柱旋转对井眼净化效果的影响规律，选择Ф15．9mm井眼及Ф127．0mm钻柱作为环空尺寸，取钻柱的偏心度为0．5，选择20m作为轴向长度构......

Small runoff, large sediment load, and incompatible relationship of flow and sediment load are very important characteri......