正循环潜孔锤实现反循环钻进双壁钻具配套研制

Development of Double-wall Drilling Tools Matching for Reverse Circulation Drilling by Positive Circulation DTH

摘要:

空气潜孔锤反循环钻进因其具有较强的携屑能力、上返冲洗液不冲刷孔壁、钻进速度快等优势，是施工大口径钻孔和抢险救援孔的首选方案。但由于反循环潜孔锤技术还不够成熟，制造成本高，使用寿命短，因此开展了用正循环潜孔锤实现反循环钻进工艺方法的研究。研制了这种工艺配套的钻具，包括大口径双壁钻杆、双壁稳定器、阻风环、正反接头等。研制的钻具在山东平邑石膏矿坍塌事故处理中得到了实践验证，完全能够达到预期目标，能够为大口径潜孔锤反循环钻进工艺推广提供硬件支撑。

Abstract:

Air DTH hammer reverse circulation drilling technology is often taken as the first scheme in large diameter boreholes and rescue holes construction because of its advantages of rapid drilling and strong cuttings carrying capacity without borehole wall being washed out. However because reverse circulation DTH technology is not enough mature with high manufacturing cost and short service life, the research on reverse circulation drilling technique with normal circulation DTH hammer is carried out and the process matching drilling tools are developed, including the improvement of the large diameter double-wall drill rod and the development of double-wall stabilizer, wind resistance ring and positive & negative joints. The practice of collapse accident treatment in Pingyi gypsum mine shows that the developed drilling tools can reach the expected goal and provide hardware support for the promotion of air reverse circulation drilling technology.