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采用能量法分析了A、B两种型号侧钻水平井双弯壳体动力钻具的结构特性 ,给出了钻具弯曲变形与井壁压力、钻头造斜力、井眼几何尺寸的关系 ,讨论了在直井眼内的下入问题。通过分析计算可知 ,当双弯壳体弯曲变形C点挠度为 4 3 58mm时 ,A型钻具与套管的摩阻力为1 1 82 8N ;当双弯壳体弯曲变形C点挠度为 6 66mm时 ,B型钻具与套管的摩阻力为 1 569 7N ,因此两种型号钻具均可顺利下入井底 ,此时钻具最大弯曲应力在C截面 ,分别为 3 9 76MPa和3 6 65MPa ,均小于材料许用应力 ,钻具强度安全系数大于 1 0 ,满足强度条件。
The energy characteristics are used to analyze the structural characteristics of A and B horizontal drilling double-walled horizontal boreholes, and the relationship between the bending deformation and borehole wall pressure, Discussed in the straight hole into the question. Through analysis and calculation, it can be seen that the friction between A-type drilling tool and bushing is 1182 8N when bending deflection of B-bend is 4 358mm; when C-bending deflection of BCC bending is 6 66mm , B-type drill and casing friction resistance of 1 569 7N, so both types of drilling tools can be successfully entered the bottom hole, this time the maximum bending stress of the drill in the C section, respectively, 3 9 76MPa and 3 6 65MPa , Are less than the allowable stress of the material, and the safety factor of the drilling tool is greater than 10, satisfying the strength conditions.