中文摘要：

根据循环介质（水）泵吸反循环排渣原理,建立底板锚固孔钻进排渣双壁钻杆模型,利用流体分析软件FLUENT对具有不同横截面尺寸双壁钻杆进行流体排渣过程数值试验研究,并以排渣效率为指标优选出双壁钻杆最优横截面尺寸。运用正交设计试验中方差分析法对影响双壁钻杆排渣效率的各因素进行详尽分析研究得知：随着循环介质进口水流量的增大,排渣效率不断提升;在一定范围内水渣混合物出口压力及钻孔深度对排渣效率的影响不明显;双壁钻杆泵吸反循环排渣系统的最优工况条件为：循环介质进口水流量为2 l/s、水渣混合物出口压力为-90 k Pa。井下底板锚固孔钻进排渣工业性试验取得了一定成效,说明流体排渣数值模拟方法能够实现双壁钻杆结构尺寸优化,并对现场钻进工作具有一定的指导意义。

英文摘要：

Based on pump suction reverse circulation principle of circulating medium （water）, double walls drilling pipe model was built for deslagging in the floor anchoring borehole, studies on deslagging process in double walls pipes with various cross section sizes were conducted through numerical ex- periments with fluid analysis software FLUENT, and the optimal double walls pipe cross section sizes are selected with deslagging efficiency as the indicator. A detailed variance analysis about various fac- tors influencing deslagging efficiency of double walls drilling pipe found that with the increase of water flow in circulating medium inlet, deslagging efficiency improves continuously; within a certain range, pressure in outlet for mixture of water and dregs and depth of holing do not have an obvious effect on deslagging efficiency; the optimal working condition of deslagging system is 2 I/s of water flow in cir- culating medium inlet and -90 kPa of pressure in outlet. Industrial field tests on deslagging in drilling floor anchoring boreholes have made some achievements, which indicates that numerical simulation can help optimize structure sizes of double walls drilling pipe and has certain reference value for field drill- ing work.