利用注水泥装置实现局部井段双层组合套管注水泥工艺，达到增加套管抗外挤强度的效果。
Using cementing equipments, the dual casing cementing technology in local intervals has been achieved to meet the requirements of the improvements of casing collapse resistance.
膨胀管残余应力是影响膨胀管抗外挤、内压强度的重要因素之一。
Residual stress in expansion casing is one of important factors affecting its squeezing and pressure resistance.
计算表明，在非均布外挤压力作用下，套管抗挤毁强度大大降低。
Calculation shows that the casing collapse resistance decreases greatly under nonuniform loads.
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