为解决小井眼钻井、小井眼水平井钻井和φ139.7 mm套管开窗侧钻井中输送测井仪器和钻水泥塞的技术难题,研制了φ73 mm(S135)直连型钻杆.其钻杆接头与管体一体化,不需要摩擦焊接,通过减小API规范φ73 mm钻杆的接头外径和设计新型钻杆螺纹,增大了接头外径与井眼的环空间隙,满足在深井中输送测井仪器和钻水泥塞施工的要求,保证了井下安全.现场应用情况表明,该钻杆抗拉、抗扭和密封性能可靠,机械钻速明显提高,钻井施工更加顺利.

According to the requirements of welding process for vortex type compressor of air conditioner manufactured in product line, a special girth welding machine with PLC as control core was developed, which had both upright and 45° incline service positions. And some key technologies were researched, such as structural design of machine body, reliable conduction of rotary weldments and quality control of welding process and so on. The experimental results showed that this machine could satisfy the requirements of welding quality and girth welding technology, results also proved the machine was a high-efficiency and low-cost automatic welding device.

为了修复因长度短于8 m而报废的石油钻井用钻铤,研究开发了钻铤窄间隙熔化极脉冲气体保护自动焊工艺.研究中针对钻铤这种小直径厚壁管的特点研制了焊接控制设备、专用焊枪,设计焊接坡口,精选保护气体,确定焊接工艺,优选焊接工艺参数.室内试验和现场应用表明,采用该工艺焊接钻铤焊区的综合力学性能得到了较大改善,其中部分性能指标达到了摩擦焊钻杆的技术要求,焊接的钻铤可在井深3 700m以内、井斜30.以内的井中使用.