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为了研究P110钢级Φ139.7 mm×10.54 mm套管挤毁位置几何参数对挤毁强度的影响,对套管抗挤毁强度进行准确预测,抽取不同批次试样9根,分别进行拉伸试验、残余应力检测和几何参数测量,并结合套管全尺寸挤毁试验结果,分析了影响该规格套管抗外压挤毁性能的主要因素及套管挤毁失效位置与几何缺陷的关系。此外,还对挤毁压力的理论/实际偏差与管体壁厚、壁厚不均度、管径、椭圆度及残余应力的关系进行了分析,拟合得出P110钢级Φ139.7 mm×10.54 mm套管挤毁强度更精准的预测公式。结果表明,在屈服强度相近、壁厚不均度在1.35%~9.21%、椭圆度小于0.56%的前提下,P110钢级Φ139.7 mm×10.54 mm套管的壁厚对抗挤毁强度的影响程度远远大于管体外径、壁厚不均度和椭圆度的影响。
In order to study the influence of geometrical parameters of the collapse location of Φ139.7 mm × 10.54 mm casing on the collapse strength of P110 steel grade, the collapse resistance of the casing was predicted accurately. Nine specimens from different batches were taken and stretched respectively The test of residual stress and the measurement of geometrical parameters are carried out. Based on the results of casing full scale collapse test, the main factors that affect the resistance to external pressure collapse of the casing and the relationship between the location of casing collapse failure and geometric defects are analyzed. In addition, the relationship between the theoretical pressure / actual deviation and the pipe wall thickness, wall thickness, pipe diameter, ovality and residual stress was also analyzed. The fitting results showed that P110 grade Φ139.7 mm × 10.54 mm Prediction formula for more accurate collapse of casing. The results show that the wall thickness of Φ139.7 mm × 10.54 mm casing of P110 steel has an effect on the collapse strength under the premise of similar yield strength, uneven wall thickness of 1.35% ~ 9.21% and ellipticity of less than 0.56% The extent is far greater than the tube diameter, thickness unevenness and ovality.