1·Casing, cement and formation plane strain mechanical model are established, considering casing with initial ovality.
针对套管的不同初始椭圆度建立了套管、水泥环、地层平面应变力学模型。
2·The cross-section distortion of bent tube is very small by using ball filler push bending process, with the ovality less than 1.5%.
运用珠粒填料推弯成形工艺成形出的管材截面畸变程度很小，椭圆度不超过1.5%。
3·Relevant operation practice has proven that with the optimalized sizing process parameters, steel tubes sized by the said mill possess decreased ovality and higher O. D. accuracy.
生产实践表明，采用优化后的定径工艺参数，钢管的椭圆度减小，外径精度提高。
4·With finite element method, the collapse strength of casing with ovality and eccentricity under unidirectional uniform and ellipse distributive force was calculated and analyzed.
采用有限元法，计算和分析了壁厚不均与椭圆套管在单向均匀和单向椭圆分布外挤力作用下的强度问题。