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中文摘要：
采用理论分析和有限元相结合的方法，给出了深井超深井套管磨损面积与磨损深度预测模型，以及均布外载条件下内壁磨损套管剩余抗外挤强度和抗内压强度的计算公式。将非均布载荷等效成均布载荷，给出了非均布外载条件下内壁磨损套管剩余抗外挤强度计算公式。将建立的理论公式计算结果与现有实验数据进行了对比，二者较为吻合。建议在深井超深井套管柱强度设计与评价时考虑套管磨损和地层弹性参数的影响，同时开展不同类型磨损套管剩余强度实验研究，进一步验证理论计算结果的精度及适用条件。
英文摘要：
In drilling deep and ultra-deep wells, such issues like casing worn area, worn depth, remaining collapse strength and burst strength under uniform loading conditions are of widely concern. By theoretical analysis and finite element method, a set of formulas on the calculation of those values are presented. Meanwhile, a formula for casing remaining collapse strength under non-uniform loading conditions is also established by converting a non-uniform loading into an equivalent uniform loading. The study shows theoretical results agree well with published test datum. Casing wear and formation elastic parameters should be considered in the casing strings design and strength assessment in an ultra-deep well drilling. At the same time, more experiments on worn casing strength evaluation are suggested to conduct for different types of casing to verify applications of the developed theoretical formulas.
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