QFGZ型潜孔锤反循环跟管钻头的研制

Development of QFGZ Type Bit for Simultaneous Casing While Reverse Circulation Drilling with DTH Air Hammer

为实现在复杂地层用同步跟管钻进工艺钻凿直径较大的桩孔和水井,设计了一种气动潜孔锤反循环跟管钻进钻头。介绍了该钻头的结构组成、工作原理和设计特点。与常规设计相比,该新型钻头流道设计可以增强排渣效果,保持孔底干净,减少重复破碎,提高钻进效率;边齿数量较多,耐磨损能力强,有利于提高使用寿命。

In order to implement simultaneous casing while drilling of larger diameter pile holes and water wells in complex strata, a new type of bit for simultaneous casing while reverse circulation drilling with DTH air hammer was developed. Its makeup, working principle and features of design are presented. Compared with conventional design, the new type reverse circulation bit for casing while drilling has several advantages. Novel passage design can improve the effectiveness of cuttings removal, result in cleaner hole, reduce fragmentation repeat, and speedup penetration. More peripheral carbon--tungsten teeth would improve the abrasion resistance and service life of the bit.