多年来,对旋转钻进水力学的研究,特别是在矿业方面,主要是为了解决排除孔底的钻粉问题。重点是研究流体通过钻杆外壁同孔壁之间的环状空隙的流动规律。可是最近钻孔水力学问题,已经分成两个研究领域。一个是象上面所说的从钻孔排除粉尘。另一个是有效地冲洗孔底。已发表的研究资料表明,只要在孔底积 Over the years, the study of rotary drilling hydraulics, especially in the mining industry, has been primarily aimed at solving the problem of drilling dust from the bottom of the hole. The focus is to study the flow of fluid through the annular gap between the outer wall of the drill pipe and the hole wall. However, recent drilling hydraulics has been divided into two research areas. One is to remove dust from the borehole as mentioned above. The other is to flush the hole bottom effectively. Published research data show that as long as the product in the pore