某井N80-Q油管粘扣及脱扣的分析

对Φ73.02 mm×5.51 mm N80-Q外加厚油管发生的粘扣及脱扣事故进行了现场调查,对粘扣及脱扣样品进行宏观分析;对该批油管螺纹接头加工质量进行了全面检测;对油管材质进行了理化检验;对油管上、卸扣性能和拉伸性能进行了系统试验.分析认为,油管螺纹加工质量和材质符合标准要求,粘扣是由不符合规范的操作所引起的,脱扣...     

油管悬挂器螺纹接头上扣扭矩研究

借助理论分析和试验方法研究了油管悬挂器与油管连接的上扣扭矩。研究表明:油管悬挂器螺纹连接采用厂家推荐的油管上扣扭矩并不合适;油管悬挂器连接如果保证上扣位置,需要提高上扣扭矩;油管悬挂器外径对上扣扭矩有较大影响,建议采用油管最大上扣扭矩对油管悬挂器上扣。     

API圆螺纹油管接头上扣与拉伸过程的有限元应力分析

抗滑脱和抗粘扣是衡量 API圆螺纹油管使用性能的两个重要指标。满足 API标准的圆螺纹油管在使用过程中仍然存在粘扣甚至滑脱等事故。通过对 API圆螺纹油管上扣与拉伸过程的有限元应力分析,探讨了影响螺纹接头抗滑脱强度和抗粘扣性能的主要因素,并提出了相应的改进措施。     

某井油管脱扣原因分析

针对某井用Φ88.9mm×6.45mm P110钢级NU油管脱扣事故进行深入调查研究,对脱扣的油管进行了宏观和微观形貌分析,对油管材质进行了理化性能试验,对该批次未使用的油管接头试样进行了参数测量。通过试验分析和研究,认为油管接头材质及螺纹参数符合标准要求,油管脱扣属于低载荷滑脱失效,滑脱失效的主要原因是由于粘扣和上扣不到位导致接头的连接强度大幅度降低造成,而粘扣和上扣不到位的主要原因是上扣过程中发生了错扣。     

HSM-2特殊螺纹接头接箍与工厂端相对转动原因分析

国外某油田现场上扣时出现特殊螺纹接头工厂端与接箍发生相对转动。利用工厂生产车间拧接和全尺寸实验室拧接进行上扣试验,探讨HSM-2特殊螺纹接头接箍与工厂端发生相对转动的原因。结果表明:现场端扭矩比工厂端高出一定值才有可能使工厂端接箍发生相对转动。建议下井前准确标定扭矩系统压力传感器,定期校验现场使用的扭矩仪。     

某井N80钢级套管脱扣和粘扣原因分析

对某井Φ139.7mm×7.72mm N80钢级长圆螺纹套管脱扣和粘扣事故进行了详细的调查研究。分析认为套管发生脱扣的原因主要是由于下套管上扣时螺纹接头发生严重粘扣,使其连接强度大幅度降低所致。该井井口中心与管柱轴线偏离较多,且采用钻杆液压钳下套管,在上扣过程中套管接箍严重夹持变形,外螺纹接头与严重夹持变形的接箍上扣配合之后导致套管严重粘扣损坏。套管严重粘扣还与套管本身抗粘扣性能差有一定关系。     

钻杆接头螺纹卸扣扭矩影响因素研究

研究钻杆接头上扣/卸扣扭矩的计算方法;根据计算公式,总结影响钻杆接头螺纹卸扣扭矩的因素;提出提高卸扣扭矩的建议。分析认为:卸扣扭矩与上扣扭矩的比值R与螺纹导程有直接关系,同样尺寸结构设计的多线螺纹比单线螺纹的卸扣扭矩小;可通过减小螺纹导程、增加辅助扭矩结构、提高螺纹脂摩擦因数和优化锥度等手段,提高钻杆接头螺纹卸扣扭矩;建议特殊接头螺纹的导程扭矩占比不高于0.16,R≥0.68。     

液压拧扣机扭矩控制与显示

本文介绍新型液压拧扣机输出扭矩的控制与显示方法。通过使用该种控制法,可使液压拧扣机在任意扭矩下卸荷,以满足不同规恪螺纹连接件上卸扣的需要。     

油套管螺纹粘扣原因分析及研究现状

螺纹粘扣作为油套管中最常见的失效形式,一直是国内外石油管应用领域的研究重点。通过对粘扣失效机理的研究,分析了油套管螺纹在制造厂加工装配和油田现场使用过程中螺纹发生粘扣现象的各种原因,介绍了目前国内外抗粘扣技术的研究现状,探讨了进一步研究的方向。     

新型螺杆钻具连接螺纹抗疲劳性能

以油田现场使用的螺杆钻具壳体连接螺纹为基础,设计出了一种特锥连接螺纹.并利用有限元分析软件,分析了特锥螺纹在上扣扭矩、上扣扭矩+轴向载荷及上扣扭矩+轴向载荷+弯矩载荷下的螺纹受力情况,并通过应变测试证明了分析结果的准确性;利用疲劳强度分析软件分析了特锥连接螺纹在弯矩载荷和轴向载荷作用下的疲劳寿命,并通过下井试验证明了新...     

TP-JC特殊螺纹接头的开发及应用

针对API EU外加厚螺纹接头存在的接头应力高、上扣控制困难、可修复性差等问题,研制出可保证气密性且成本低的TP-JC特殊螺纹接头油套管。对该产品的开发及应用情况进行了详细介绍,该产品通过了ISO 13679∶2002 CALⅡ(简化版)实物性能试验,抗螺纹黏结性能、密封完整性、结构完整性均达到了产品设计要求,并在油田完成了相应的下井及密封试验。     

Analytical study of maximal tapping torque during forming screw process

Forming screws lead to a bolted assembly forming the threads of the work-piece by displacing material. The automotive industry is one of the largest markets for forming screws, which have been developed in the last ten years. One of the problems facing the designer of bolted assemblies using forming screws is the knowledge of the forming torque during the process.This study proposes an analytical model based on a previous study concerning radial penetration of a rigid acute wedge into a perfectly plastic material. The method uses the slip-line method with a model taking into account the interaction between two consecutive formed threads and enables the mean pressure on the thread flank to be obtained as a function of the formed thread height. From these results and a knowledge of the forming screw end geometry, an analytical method is proposed for the maximum forming torque, the physical phenomena of the displacement of material in the tapping process is illustrated and the significantly influential parameters highlighted. An experimental study seeks to determine the optimal lead hole on the work piece for an M8 screw. This sets limits on the forming torque and conserves a sufficiently well formed thread shape for good stripping resistance. The experimental results are compared favorably with the results of the analytical study in order to validate the forming screw model.     

特殊螺纹接头油管腐蚀原因分析

对某井特殊螺纹接头油管腐蚀穿孔事故进行了调查研究,对腐蚀穿孔的油管接头样品的化学成分、力学性能、金相组织进行了试验分析,对油管腐蚀形貌进行了微观分析和宏观分析,对油管腐蚀产物进行了能谱分析,依据试验结果对袖管腐蚀的原因进行了分析讨论．认为油管属于局部冲刷腐蚀,冲刷腐蚀原因是接头部位存在结构变化引起的紊流。     

Experimental study of forming and tightening processes with thread forming screws

Thread forming screws are being increasingly used, particularly in the automobile industry. They are designed to directly assemble two parts by displacing material to form their own thread. This specificity implies knowledge of the screwing torque needed for the thread to be formed in the lower plate of the assembly and of the tightening torque necessary so as to establish the preload in the assembly. The experimental study presented in this paper is divided into two parts.The first concerns the thread forming process and shows the influence of the geometrical parameters of the thread forming screw and of the work-piece, and the influence of the process parameters on the maximum forming torque. A compromise can be proposed for the choice of the lead hole diameter, which is the most important parameter to be considered in order to keep a reasonable forming torque while obtaining threads deep enough to avoid stripping problems.The second part concerns the tightening process. An original experimental device is used to enable an empirical formula to be proposed, based on the ISO standard screw formula giving the tightening torque according to the preload applied inside the assembly.     

空心抽油杆螺纹黏结原因分析及预防

介绍了空心抽油杆的螺纹结构、加工工艺和基本使用条件。对出现螺纹黏结的杆头和接箍进行了材料成分和性能分析,对使用现场的相关设备、操作过程进行了追踪检查,指出了空心抽油杆螺纹黏结既与制造质量有关,也与现场应用不当相关。同时对空心抽油杆的螺纹黏结给出了预防措施,并对现行标准的进一步完善提出了相关建议。