BG110T抗挤套管的试验研究(下)——残余应力、平均壁厚、屈服强度对临界抗挤强度的影响

结合BG110T和BG110TT套管的研制开发,系统研究了轧管热处理工艺对套管残余应力、壁厚公差、屈服强度以及临界抗挤压力的影响。研究结果表明,孔型设计采用壁厚正公差,采用多机架均整及严格控制回火温度与矫直温度,可使套管屈服强度提高,残余应力降低,从而有效地提高了套管的抗挤毁性能。当残余应力控制在100MPa以内,壁厚公差控制在+8%左右时,套管的临界抗挤压力可达到API标准值的1.6倍。

Experimental Research on BG110T Anti- collapse Casing(PartⅡ ) - - Influence by residual stress, average wall thickness and yield strength on critical anti- collapse strength

Based on the R &D of the BG110T and BG110TT casings,a systematic research c oncerning the influ-ence by the heat treatment processes adopted during pipe rolling on the re sidual stress,wall thickness tolerance,yield strength and critical anti -collapse strength of the casing is conducted.The result demonstrates that the casing yield strength can be enhanced,while the r esidual stress thereof can be reduced by means of the minus tolerance bein g used for the groove design,multi -stand reeling and properly controlling of the t empering temperature and the temperature for straightening,so as to considerabl y increase anti -collapse performan ce of the casing,and that critical an ti -collapse strength of the casing will be up to 1.6times as great as the API specified v alue in case the residual stress is wi thin 100MPa,and the wall thickness tolerance is about +8%owing to properly contr olling.