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。

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。

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%。

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。

The bended part of a tube has the ovality less than 2%, smooth inside wall without folding and even outside wall thickness without crack.

弯管部位管材的椭圆度小于2%，内壁光滑无皱褶，外部壁厚均匀无开裂。