SEW高抗擠套管抗外壓擠毀性能研究

Research on Resistance Properties against External Collapse of SEW High Collapse-resistant Casing

摘要: 研究了80～125鋼級SEW高抗擠套管的材料性能、尺寸精度、殘余應(yīng)力和抗外壓擠毀性能。研究結(jié)果表明：屈服強度是影響SEW高抗擠套管抗擠強度的決定性因素，徑壁比、外徑不圓度、壁厚不均度和殘余應(yīng)力是影響SEW高抗擠套管抗擠強度的主要因素；提高套管的屈服強度和尺寸精度，減小徑壁比，降低殘余應(yīng)力均可提高套管的抗外壓擠毀性能。

Abstract: Studied are the main aspects of the SEW hi-collapse-resistant casings made in 80~125 ksi grade steel, including material properties, dimensional accuracy, residual stress and resistance against external collapse, etc.The study result reveals that the yield strength is the determining factor affecting the collapse resistance of the SEW casing, while other factors such as DS ratio, outer roundness, wall thickness unevenness rate and residual stress act as the main elements affecting the anti-collapse strength of the casing. Accordingly, properties against external collapse of the SEW casings are expected to be improved by means of enhancing yield strength and dimensional accuracy, and reducing DS ratio and residual stress.