关键词: 全角变化率, 弯曲应力, 定向导孔, 反井钻具

Abstract: Abstract: The current domestic developments in large diameter deep shaft construction formation, the well drilling rig drilling method as a kind of mechanized shaft sinking method, by means of directional drilling technology, can achieve the goal of safety fast high precision construction of large diameter deep well .Firstly, directional drill is used to drill the pilot hole and control the borehole trajectory, well then use the drill hole enlarge pilot hole Due to the deviation of the pilot hole, the total Angle change rate of the pilot hole track will have a great influence on the sweep of the large diameter drilling tool. Through the theoretical analysis of bending stress, the relationship between the total Angle change rate of the pilot hole track and the large diameter reverse drilling tool is established. By analyzing the measured deviation data of the pilot hole, the trajectory model of the pilot hole is established. Through the industrial test of directional reverse well drilling, the influence degree of the total Angle change rate of the guide hole on the sweeping of the large diameter reverse well drilling tool is studied. The results show that the method can accurately predict the state of the drilling tool during the sweeping, which provides theoretical and technical support for ensuring the safe and smooth sweeping of the drilling tool during the construction of the large diameter deep reverse well drilling method.