顶板高位大直径水平长钻孔配套钻具研制

Development of Drilling Tool for Large Diameter Long Horizontal Borehole at High Position of Roof

摘要:

针对煤矿井下顶板高位大直径水平定向长钻孔施工中常规钻杆出现粘扣、弯曲、断裂等问题，分析了钻杆柱的工作状态，建立了顶板高位大直径长钻孔钻杆柱受力模型和有限元分析模型，明确了钻杆失效的主要原因，通过优化螺纹牙型和接头连接形式，研制了φ73 mm高韧性高强度钻杆，解决了定向钻孔扩孔钻进时钻杆断裂、粘扣等问题，满足了顶板高位大直径定向长钻孔的施工要求。

Abstract:

The thread gluing, bending and fracture of conventional drill pipe often occur during large diameter long horizontal directional borehole drilling at the high position of coal mine roof. The analysis is made on the working state of drill string and the stress mode of drill string and finite element analysis mode are established, the main reasons of pipe failure is defined. By optimizing thread tooth type and joint connection form, φ73 drill pipe is developed with high toughness and strength, which can overcome drill pipe rupture, thread gluing and some other disadvantages to meet the requirements of large diameter long horizontal directional borehole drilling construction at high position of coal mine roof.