关于超高强度套管夏比冲击吸收能规定值的讨论

Discussion on Specified Charpy Impact Energy Value of Extra-hi-strength Oil Casing

通过对套管、钻杆管体的载荷、失效模式及夏比冲击吸收能的要求的对比分析,对超高强度套管、钻杆及钻柱构件夏比冲击吸收能要求的区别,尤其对夏比冲击吸收能平均值为屈服强度下限值的1/10的经验式的适用性进行了讨论,指出将该经验式推广至载荷状态和失效模式不同的深井超高强度套管及套管柱在理论上和实践上都是缺乏依据并且是有害的。对深井超高强度套管提出不适当的过高的韧性要求,只能造成性能过剩和制造成本的上升。

Conducted are relevant comparative analysis relating load of pipe bodied of casing and drill pipe,their failure types and the required Charpy impact energy values.Discussed are the differences between the Charpy impact energy value of the extra-hi-strength casing and those of the drill pipe and the drill stem elements,on the basis of the analysis.Particularly discussed is the suitability of the imperial equation indicating that the average Charpy impact energy value is 1/10 of the lower limit value of yield strength.The co-authors regard that it is hamful,and practically and theoretically groundless to further apply the said imperial equation to the deep wellservice extra-hi-strength casing and casing string which have quite different load status and failure type.Any unsuitable and excessively critical requirement for toughness of the deep well-service extra-hi-strength casing can do nothing but lead to function surplus and increase of manufacture cost.