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1·Practice shows that both ovality and eccentricity affect the casing collapse resistance obviously.

实践证明，不圆度和壁厚不均度对套管抗挤强度的影响是相当可观的。

2·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。

3·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%。

4·The errors of the stand-off measurement and measurement errors made by pitch diameter gauge and ovality gauge are analyzed and compared.

分析比较了紧密距测量以及中径和椭圆度量规测量的误差。

5·This is an important factor in determining the operating limits of coiled tubing strings since the action of spooling the string tends to induce some ovality.

这是确定挠性管柱工作范围的重要因素，因为挠性管的缠绕趋向于产生某个椭圆度。

6·Accordingly, a calculation formula for the groove ovality factor of the deformation section is deduced, and the effective range of the groove ovality factor is set.

推导了变形区孔型椭圆度系数的计算公式，确定了孔型椭圆度系数的有效范围。

7·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。

8·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。

9·The results of calculation show that the maximum value of distributive force the casing can resist depends on eccentricity, ovality, and the mode of distributive force as well as its direction.

计算结果表明，套管所能承受最大分布力与其壁厚不均度、椭圆度、分布力的类型和方向等因素有关。

椭圆

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。

椭圆度

1·This is an important factor in determining the operating limits of coiled tubing strings since the action of spooling the string tends to induce some ovality.

这是确定挠性管柱工作范围的重要因素，因为挠性管的缠绕趋向于产生某个椭圆度。