关键词: 卡瓦, 套管柱, 薄壳理论, 承载强度

Abstract: It is very important for the designs of well casing strings, especially for those of deep wells and super deep wells to analyze the load bearing capacity of tubes inside slips. There are many different model to deal with this problem including that of API. However, those models didn't consider the local bending stresses at tube walls due to the actions of slips to tubes. That means their analysis are applied only to the calculations of plastic load bearing capacity of tubes inside of slip. Based on shell theory, this paper presents a new model about the elastic load bearing capacity of tubes inside of slips and the calculated results shows that it is consistent with those of FEM and experiments.

Key words: slips, tube, shell theory, load bearing capacity