The Mechanical Performance of V150 Drill Pipe under Combined Tension-Torsion Loading
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摘要:
深井超深井钻井中，不合适的拉扭耦合作用容易导致钻杆失效，因此有必要进行钻杆抗拉扭复合载荷能力研究。采用预扭后拉伸和预拉后扭转的拉扭复合载荷试验方法，分析了拉扭复合载荷条件下V150钻杆在拉伸应力应变和扭转应力应变之间的相互影响规律。试验发现：预扭后拉伸时，预加载切应力和拉伸屈服强度均会降低；预拉后扭转时，预加载的拉应力和扭转屈服强度均会降低；材料发生屈服时的拉应力和切应力符合拉扭椭圆强度准则，该准则的弹性变形安全范围较von Mises强度准则超出24.5%。研究结果表明，按照von Mises强度准则进行V150钻杆抗拉扭复合载荷能力设计偏于保守，而拉扭椭圆强度准则包含材料拉伸屈服强度和扭转屈服强度2个基准参数，且与试验数据吻合程度高，更具工程应用价值。
Abstract:During the drilling of deep wells and ultra-deep wells, unsuitable tension-torsion coupling results to the failure of drill pipe. Therefore, it is necessary to study the combined tension-torsion resistant loading capacity of drill pipe. The combined tension-torsion loading test methods of pre-torsion followed by tension and pre-tension followed by torsion were used to analyze the interaction laws between the tensile stress/strain and torsional stress/strain of V150 drill pipe. It was found that during the pre-torsion followed by tension, both the preload shear stress and tensile yield strength were reduced; during the pre-tension followed by torsion, both the preload tensile stress and torsional yield strength were reduced. When material yielding occured, the tensile stress and shear stress were in accordance with the tension-torsion ellipse strength criterion, and the elastic deformation safety range of this tension-torsion ellipse strength criterion was 24.5% higher than that of von Mises strength criterion. The results showed that the combined tension-torsion resistant loading capacity of drill pipe designed according to the von Mises strength criterion was conservative to some extent, while the tension-torsion ellipse strength criterion included two benchmark parameters of tensile yield strength and torsional yield strength. Such criterion perfectly aligned with the experimental data and exhibited high engineering application value.
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图 2 预扭后拉伸时的应力–拉应变曲线
Figure 2. Curve between stress and tensile strain during the pre-torsion followed by tension
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图 3 预拉后扭转时的应力–切应变曲线
Figure 3. Curve between stress and shear strain during the pre-tension followed by torsion
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图 4 预扭后拉伸时的拉应力–拉应变曲线
Figure 4. Curve between tensile stress and tensile strain during the pre-torsion followed by tension
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图 5 预拉后扭转的切应力–切应变曲线
Figure 5. Curve between shear stress and shear strain during the pre-tension followed by torsion
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图 6 预扭后拉伸试验的初始预加载切应力–屈服时切应力曲线
Figure 6. Curve between initial preload shear stress and yielding shear stress which was obtained from pre-torsion followed by tension test
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图 7 预扭后拉伸试验的初始预加载切应力平方–屈服时拉应力和切应力平方和曲线
Figure 7. Curve between the square of initial preload shear stress and the sum of squares of yielding tensile stress and shear stress which was obtained from pre-torsion followed by tension test
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图 8 预拉后扭转试验的初始预加载拉应力–屈服时拉应力曲线
Figure 8. Curve between initial preload tensile stress and yielding tensile stress which was obtained from pre-tension followed by torsion test
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图 9 预拉后扭转试验的初始预加载拉应力平方-屈服时拉应力和切应力平方和曲线
Figure 9. Curve between the square of initial preload tensile stress and the sum of squares of yielding tensile stress and shear stress which was obtained from pre-tension followed by torsion test
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图 10 V150钻杆试样拉扭试验临界屈服数据与相关强度准则曲线比较
Figure 10. Comparison curve of critical yield data and correlation strength criterion in the tension-torsion test of V150 drill pipe
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