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介绍了攀成钢研发的一种超高强度直连型特殊螺纹接头套管,通过优化螺纹结构设计、采用“电炉LF+VD炼钢+连轧机组轧制+加厚机管端加厚+热处理+车丝机加工螺纹”工艺,开发出了满足国内某油田侧钻井要求的139.7×7.72mm CS-140ZT超高强度直连型特殊螺纹接头套管,阐述了工艺技术难点及相应措施。结果表明:开发的产品具有钢种纯净、几何尺寸精度高、高强度高韧性能匹配、螺纹接头连接强度高等特点,并已在国内某油田成功应用。
This paper introduces a kind of super high-strength direct-coupled special threaded joint casing developed by Pancheng Iron and Steel Co., Ltd. It adopts “LF + VD steelmaking + continuous rolling mill rolling + thickening machine pipe end thickening + Heat treatment + thread processing thread ”technology, developed to meet the domestic side of the drilling requirements of a 139.7 × 7.72mm CS-140ZT ultra-high strength direct-coupled special threaded sleeve, described the technical difficulties and the corresponding Measures. The results show that the developed products have the characteristics of pure steel, high geometric precision, high strength and toughness matching, high strength of threaded joints, and have been successfully applied in a domestic oilfield.