基于光纤光栅传感的螺纹钻杆复合载荷多节点检测技术

引入光纤光栅应变传感器和温度传感器,结合螺纹钻杆复合载荷（轴向压力、弯矩和扭矩）分离理论,实现对钻进过程中螺纹钻杆多节点处复合载荷自动分离与在线检测,同时对钻进过程中出现的温升进行了补偿。将检测结果与电机施加的载荷（压力和扭矩）进行对比分析,认为螺纹钻杆前端（靠近钻头一侧）受到被钻物侧向挤压和摩擦阻力较大,使得电机施加的压力和扭矩传递损耗较多,导致易磨损、变形;而螺纹钻杆中段和末端只是短暂甚至未进入被钻物,传递损耗相对较少,受弯矩的影响较大。该检测技术为钻杆材料的选择、结构优化和钻进参数的选定提供技术支撑。     

SIMULATIONS OF FLOW INDUCED CORROSION IN API DRILLPIPE CONNECTOR

Drillpipe failure is an outstanding issue in drilling engineering, often involving great financial losses. In view of the special features of the flow channel in the high failure zone, this article analyzes the drillpipe failure mechanism from the point of view of flow induced corrosion. Based on the Eulerian-Langrangian method and the discrete phase model, a numerical simulation method is used to investigate the flows of the drilling fluid in the drillpipe connector during the operation of three typical drilling methods (mud drilling, air drilling and foam drilling). From the flow field in the drillpipe connector, especially, the velocity and pressure distributions in the threaded nipple and the thickened intermediate belt, one may detect the existence of the flow induced corrosion. Then, some structural optimization measures for the drillpipe connector are proposed, and the optimization effects are compared.     

高强度钻铤螺纹的研制及应用

在分析钻铤螺纹失效部位及原因的基础上，研制了高强度钻铤螺纹，它与普通钻铤螺纹相比，只是在外螺纹小端增加了一段光平的锥体。当钻铤上扣到规定扭矩时形成第二台肩，第二台肩和第一台肩同时顶紧，螺纹最小截面积可增加４３％，增加了螺纹承载能力。现场使用表明，使用高强度钻铤螺纹是延长钻铤寿命、减少井下事故的一种有效措施。     

井底降压差短节显著提高机械钻速

提出了最新研制的井底降压差短节的设计原理，介绍了其水力参数设计和现场试验情况。在坪西１井的现场试验表明，井底降压差短节能降低井底压差，减少井底压持效应，可提高机械钻速１２％，具有推广应用价值。     

Adhesives in the assembly of automotive drive-line equipment

The engine and running gear of a motor vehicle present unusual problems and opportunities for the use of adhesives. Assemblies typically consist of rigid, close-fitting parts often subjected to vibrations, temperature cycling and the presence of various fluids. Anaerobic adhesives are particularly suitable for this type of environment, offering excellent resistance to the conditions encountered. Originally used for thread-locking and sealing, they have been developed as gasketing materials and as retaining adhesives, principally for concentric fitted parts. Examples are quoted of the retention of cylinder liners and of a final drive gear assembly.     

抽油机曲柄销螺纹联接松动的原因分析及预防

分析抽油机曲柄销螺纹联接在使用中发生松动的主要原因，并提出相应的预防措施；设计了新的防松装置，简要介绍其结构和工作原理，它具有工作可靠、防松效果好等特点；给出了曲柄销联接螺母的最小拧螺力矩计算公式。     

钢筋等强度剥肋滚压直螺纹连接技术在火电厂主厂房施工中的应用

等强度剥肋滚压直螺纹连接技术是钢筋机械连接技术发展中较为先进的连接技术 ,我局承建的罗定 1×1 2 5MW机组电厂、连州二期 1× 1 2 5MW机组电厂主厂房等工程中推广使用了该项技术 ,钢筋连接快捷、质量好 ,施工工期明显缩短 ,取得了较好的经济效益和社会效益     

刚性长螺纹锚杆及其在巷帮支护中的应用

为避免巷道扩帮后重新补打锚杆,研发了巷帮支护的一种新型刚性长螺纹锚杆,并在焦作煤业集团赵固二矿进行现场试验,对试验巷道进行深基点位移监测和表面位移监测,监测结果表明,由于刚性长螺纹锚杆有高强长螺纹锚尾,在扩帮后,只需继续拧紧螺母,截掉外露多余部分即可,刚性长螺纹锚杆可以充分利用原有巷帮支护,避免重新补打锚杆,不仅节省扩帮维修费用,还能缩短巷道维修时间,其支护效果要优于普通锚网索的支护效果。     

计算石油套管特殊螺纹接头e_m值的一种新方法

介绍了API标准中关于石油套管螺纹接头em的计算公式。基于此理念,引导出计算石油套管特殊螺纹接头em值的计算公式,并给予解析说明。应用计算机机械制图法,详细给出了计算em的简单、便捷的一种新方法。该特殊螺纹接头值em的计算求法适用于石油套管行业特殊螺纹接头的生产应用,可供参考使用。     

UHP石墨电极接头糊料及生坯的微观特征

分析描述了超高功率石墨电极接头的糊料、生坯在偏光显微镜下的不同微观结构特征,把分析结果应用于生产实际的工艺改进,并对改进前后的产品进行了对比评价。