The inside (including the taper) is usually made of cement or thermoplastic, since this material must be drilled out if the well is to be deepened beyond the casing point.
浮鞋的内部（包括锥型段部分）通常由水泥或热塑性材料组成，如果在套管鞋处井眼还需要继续加深的话这种材料必须被钻掉。
Based on this point, the mechanics and finite element models for casing stress calculation are established.
在考虑这一特点的基础上，建立了套管应力计算的力学及有限元模型。
Optimizing casing retrieving depth and side-tracking point by minimum cost method due to different kinds of abandoned Wells.
根据不同类型报废井，按最低成本法优选取套深度和侧斜点。
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