剪口特性：套管截面用剪刀剪断后。剪口平整、不松散。
Cutting feature: when the sleeving crosscut the cross end without loose and remain smooth.
介绍了衡量套管不均匀变形程度的指标一截面形状变化指数，并用试验数据对该指标的应用进行了检验。
The section form variation coefficient which is the judgment of non-uniform deformation degree index of casing is introduced. And the application of the index is examined by the test data.
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