石油套管制造标准实用性问题探讨

为了使石油套管制造标准更好的指导实际生产，通过对接箍最小外径对承载面宽度的影响、套管最小外径对螺纹LC的影响、螺纹紧密距测量方法、螺纹锥度测量方法和接箍螺纹标识方法等石油套管制造标准实用性问题探讨和分析。分析结果表明:提高接箍外径、套管外径的极限下偏差，能够有效保障承载面宽度、螺纹LC、L4满足标准要求；采用测量管坯圆周方向的每一段圆弧半径差值的方法，及时调整管坯圆度的制造精度，提高管坯在螺纹加工LC合格率；采用恒定力矩扳手辅助检验紧密距，可避免因人力差异导致紧密距检验误判风险；建议在标准的锤压印标识内容中增加螺纹类型项。

Discussion on Practical Problem of Oil Casing Manufacturing Standard

In order to make oil casing manufacturing standards guide actual production better, the influence of minimum outer diameter of coupling on width of bearing surface, the influence of minimum diameter of casing on thread LC, measuring method of thread standoff, measuring method of thread taper, identification method of coupling thread and some other practical problems of oil casing manufacturing standards were discussed and analyzed. The results showed that increasing the outside diameter of coupling and limit lower deviation of casing outside diameter could meet the standard requirement of width of bearing surface, thread LC and L4; the method of testing radius difference of billet peripheral direction and adjusting accuracy of billet roundness could improve the qualified rate in thread machining LC; checking standoff with fixed moment of force spanner assistance could avoid misclassification risk of checking standoff because of personal difference; it was suggested that thread type items should be added in hammer imprint marking of standards.