松软突出煤层新型钻进技术研究

低螺旋钻杆是为解决松软突出煤层钻进难题而发明的一种新型钻杆.为充分发挥低螺旋钻杆应用于松软煤层钻进的优势,根据实际应用情况,建立相应的排渣数值模型,分析低螺旋钻杆螺旋凸棱的宽度和螺距的变化对排渣效果的影响情况；根据在实际应用中配套钻机的动力参数,对低螺旋钻杆进行强度分析.研究结果表明,螺旋凸棱宽度l为14 mm,螺距s为80 mm,排渣效果最优,且钻杆强度的最小安全系数为1.87,钻杆加工参数优化设计合理.通过松软突出煤层钻进工业性试验,钻进深度和钻进效率提高显著.

Study on New Drilling Technology in Soft and Outburst Seam

Low spiral drill rod is a new type of drill rod,which invented to solve the drilling problems of soft and outburst seam.In order to fully play the advantage when low spiral rod applied to soft coal seam drilling,the paper analysis effect on the slag removal conditions due to low spiral rod in different spiral convex edges width and pitch change according to the practical applications and establish corre-sponding numerical model of the slag removal.According to the dynamic parameters of the matching drilling rig in engineering application,the strength of low spiral rod has been analyzed.The result of study shows that it is optimum to slag removal result,and the minimum safety factor of drill rod strength for 1.87 with the convex edges width l=14 mm,pitch s=80 mm.It is reasonable to optimiza-tion parameter design of machining low spiral drill rod.Depth and efficiency increase significantly showing when drilling industrial experiment carried out.