It has a practical meaning for the strength design and combination usage of drill string, casing and tubing under different technological conditions.
对处于不同工艺条件下的钻柱、套管、油管的强度设计和组合使用等均有实际意义。
Analysis on the load bearing capacity of tubes inside slips is very important for the design of well casing string, especially for that of deep well and super deep well.
在油井特别是深井和超深井的套管柱设计中，对卡瓦内悬挂管柱承载能力进行分析是十分重要的。
Meanwhile, underground cycle temperature is also related to the pressure balance in a well, the stability of well bore and the design of casing and string.
同时它还与井内压力平衡，井壁稳定，套管和钻柱强度设计密切相关。
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