我国特殊螺纹接头油套管生产使用现状及需要注意的几个问题

随着钻井技术的进步,油套管的服役条件更加苛刻,按照API标准生产的油套管螺纹接头已经不能满足某些油气井的使用要求,因此特殊螺纹接头的应用范围不断扩大。我国开发特殊螺纹接头尚处于初级阶段。综述了我国特殊螺纹接头油套管的生产使用现状,指出了我国特殊螺纹接头使用和开发过程中需要解决的问题,并就特殊螺纹接头的开发提出了几点建议。     

热采井用套管接头特殊螺纹的有限元分析

基于热采井用套管接头评价规范,对两种不同类型的特殊螺纹进行有限元分析。分析结果表明:在热采井试验中,齿侧过盈、弧对锥密封面的特殊螺纹,其密封面接触压力和接触长度受温度和压力载荷影响较小,能够保证良好的密封能力。所以,这种形式的特殊螺纹接头更适用于蒸汽辅助重力泄油井况。     

高温高压井特殊螺纹接头的选用与评价试验

介绍了高温高压井的分类。分析了目前高温高压井开发中存在的问题。探讨了高温高压井特殊螺纹接头的选用及测试评价。介绍了壳牌公司在高温高压井测试评价试验方面的成功应用经验。分析认为:应对高温高压井用特殊螺纹接头进行全面的实物测试评价试验,以证明其具有较高的可靠性和适用性;根据使用工况选择适当的接头测试试验级别,并依据ISO 13679∶2002标准制定补充试验评价程序;可借鉴壳牌公司在高温高压井用特殊螺纹接头选用中的经验,使用双级密封结构的特殊螺纹接头。     

天津钢管集团有限公司加大对特殊螺纹套管的研发力度

为了满足油田勘探开发的需要，近年来天津钢管集团有限公司加大了特殊螺纹套管开发和生产的力度，2006年截至10月份特殊螺纹套管的产量达到2．8万t，预计全年可生产特殊螺纹套管4．0万t。     

高温高压井用特殊螺纹接头的设计与评价现状

结合国内外在开发、应用特殊螺纹接头过程中取得的经验成果,探讨和总结高温高压井用特殊螺纹接头的结构设计、选用要点及评价方法,详细介绍螺纹、扭矩台肩及密封结构设计。总结在极端负载条件下评价特殊螺纹接头密封性能的理论方法,为进一步有针对性地优化设计、选用特殊螺纹油井管产品提供参考,从而有效解决油井管失效问题。     

适用于高含硫气井Φ355.6 mm高抗内压特殊螺纹套管的开发

根据川渝地区高含硫气井开发的特殊需求,设计开发非标准规格Φ355.6 mm×21.0 mm TP110STPG2 HP高抗内压特殊螺纹套管。介绍了套管的生产控制工艺和TP-G2 HP高抗内压特殊螺纹接头的设计原则,并通过理化性能试验、抗硫化氢腐蚀试验、抗内压试验和有限元模拟分析验证了Φ355.6 mm特殊螺纹套管具有优异的性能,完全满足油田工况需求。     

某高压气井13Cr油管柱泄漏和腐蚀原因分析

某高压气井完井后,13Cr不锈钢特殊螺纹接头油管柱泄漏,套管压力升高,不得不进行修井作业。对该井取出的油管现场端和工厂端螺纹接头逐根检测,发现多根油管腐蚀和泄漏。抽样分析表明,油管力学性能符合工厂规定;该种13Cr油管材料在该井工况条件下不抗腐蚀,油管接头结构导致腐蚀集中,在油井酸化后接头已发生腐蚀,导致接触压力不足,油管接头部位比管体内壁腐蚀更为严重。     

TP-NF/E特殊间隙接箍接头的开发

针对页岩气井的井身结构特点及其对特殊螺纹的使用需求,研制开发了一种TP-NF/E特殊间隙接箍接头。介绍了Φ139.7 mm×10.54 mm规格P110 TP-NF/E特殊螺纹接头的开发情况;运用有限元分析和ISO13679∶2002 CAL II实物性能试验,评价了TP-NF/E特殊螺纹接头的抗螺纹黏结性能、密封完整性、结构完整性等。分析认为:该特殊螺纹采用勾型螺纹连接、锥-锥金属密封面、止扭矩台肩的形式设计,具有良好的抗螺纹黏结和密封性能、较大的抗弯曲能力、较高的抗压缩能力,达到了产品设计要求     

模拟工况下特殊螺纹密封特性的有限元分析

借助ABAQUS有限元分析软件,对模拟工况下的常用特殊螺纹接头密封特性进行有限元分析,重点研究了该特殊螺纹接头在螺纹拧紧、拉伸、内压以及温度复合条件下的密封性能。结果表明:该特殊螺纹接头在服役环境下,密封面始终可以保持较高的接触应力,且等效VME应力最大值小于该材料的屈服强度,可有效减小接头在服役时发生泄漏或黏结的可能性。     

油套管双头螺纹接头开发试验研究

介绍了一种油套管双头螺纹接头的开发过程.双头螺纹的上扣速度是常规螺纹接头的两倍以上,可以大幅提高下井效率.结合具体产品规格对双头螺纹接头进行了有限元分析、加工工艺研究以及实物性能试验.分析结果表明,双头螺纹接头应力分布均匀,上扣速度快,接头性能满足使用要求,证明了双头螺纹形式的合理性.     

Influence of tool thread on mechanical properties of dissimilar Al alloy friction stir spot welds

Abstract

The influence of threaded and wear simulated (half thread) tools on the mechanical properties of dissimilar Al alloy friction stir spot welds is investigated. With lower tool rotational speed settings, the failure loads of Al 5754/Al 6111 lap joints made using a threaded tool were clearly higher than that of a half thread tool. However, the failure load of the joints made using a half thread tool increased when the tool rotational speed increased, and finally, as the rotational speed was further increased, the failure load became almost the same as the failure load of joints made using a threaded tool. In Al 5052/Al 6061 butt joints made using the threaded and half thread tools, the area of the stir zone on the bonded cross-section corresponded with the actual bonded region on the fracture surface. Therefore, the thread on the rotating pin has limited influence on the mechanical properties of the friction stir spot lap joints.     

预制混凝土塔筒用钢筋螺纹套筒的开发

介绍了风力发电机组预制混凝土塔筒用钢筋螺纹套筒开发的过程及其产品特点。通过钢筋螺纹套筒设计、调整加工工艺和热处理工艺,生产出满足预制混凝土塔筒用钢筋螺纹套筒连接件,用于C型预制混凝土管片竖缝的拼接。     

Influence of tool design on mechanical properties of AZ31 friction stir spot welds

Abstract

The influence of tool design on the energy output, microstructural features and overlap shear strength properties of friction stir spot welds made of AZ31 base material is examined. The mechanical properties of AZ31 friction stir spot welds made using three-flat/threaded tools are superior to those in joints made using a tool with a threaded pin at all tool rotational speed settings. It is proposed that the failure load properties are optimised when the friction stir spot welding operation is carried out in such a manner that it produces a large bonded width, a small v/t ratio (the height of the hook region above the sheet intersection divided by the thickness of the upper sheet) and a hook region, which is curved outwards from the tool axis.     

加快我国特殊油井管的开发

介绍了我国石油需求量及生产量的预测情况， 石油钻采用油井管的种类、用途以及我国油井管实物质量存在的问题。介绍了随着我国石油天然气钻采条件的恶化， 对钻采用特殊油井管的需求情况以及特殊油井管的种类。还简介了我国某钢管集团公司正在建设的高强度、特殊螺纹油井管生产线的特点     

核电站工程建设阶段典型防腐问题与改进

在核电站防腐管理过程中,发现了源于设计、制造、安装、调试阶段的典型防腐问题,主要对除盐水箱、主油箱、螺栓、衬里、不锈钢等防腐问题进行了腐蚀机理分析,提出了处理建议,明确了在防腐问题处理过程中质量控制要点,最后对防腐管理提出改进建议。     

High-Speed Friction Stir Welding of T6-Treated B_4Cp/6061Al Composite

T6-treated 20 wt% B_4 Cp/6061 Al sheets were joined under welding speeds of 400–1200 mm/min by friction stir welding(FSW) with a threaded cermet pin. The macro-defect-free FSW joints could be achieved at high welding speeds up to 1200 mm/min, but larger plunge depth was required at the welding speeds of 800 and 1200 mm/min to eliminate the tunnel defect. In the nugget zone(NZ) of the joints, the B_4 C particles were broken up and uniformly redistributed. The NZ exhibited lower hardness than the base metal(BM), and the hardness value almost did not change with increasing welding speed, attributable to the dissolution of precipitates. Compared with the BM, the joints showed lower tensile strength. As the welding speed increased from 400 to 800 mm/min, the joint efficiencies were nearly the same and up to ～ 73%. When the welding speed increased up to 1200 mm/min, the tensile strength significantly decreased, due to the occurrence of kissing bond defect at the bottom of the NZ. With increasing welding speed, the fracture location of the joints transferred gradually from the heat-affected zone to the NZ due to the kissing bond defects.     

Prevention of Repaired Steel Tanks from Sulfide Corrosion Cracking

Recent practice in the oil fields of the Ural–Volga region and West Siberia showed that RVS oil tanks, having been repaired with manual arc welding and substitution of carbon steel for the design steel 092C, more frequently undergo corrosion failure. Recommendations for welding techniques and application of coatings to enhance the welded joints resistance to corrosion cracking are formulated.     

Microstructure and fracture toughness of electron beam welded joints of 30CrMnSiNi2A steel

Two post-weld heat-treatments ( PWHT) , 900℃ oil quenched and low temperature tempered (PWHTA) and high temperature tempered and then 900~C oil quenched and low temperature tempered ( PWHTB ) , are employed to treat the weldment. Then the effect of two post-weld heat-treatment processes on the microstructure, mechanical properties and fiacture toughness of electron beam welded joints of 30CrMnSiNt‘2A steel have been discussed. The results show that, after two kinds of PWHT the microstructure and hardness at every zones of EBW joints are nearly same. Although the welds have good mechanical properties, fiacture toughness of both weld and heat-affected zone (HAZ) is low, the CTOD values of welds are comparatively higher than that of HAZ. Microstructure and fiacture toughness of two EBW joints have no evident differences.     

热处理工艺对0Cr13Ni5Mo钢焊接接头组织和性能的影响

对马氏体不锈钢0Cr13Ni5Mo焊接接头经过1000℃油淬后,分别进行了600℃,620℃+600℃,400℃回火。通过显微组织分析、拉伸试验、冲击试验和硬度检测对3种焊接接头的组织和力学性能进行了研究。结果表明,3种焊接接头中焊缝组织粗大,硬度最高;焊接接头的韧性低于相应热处理状态下母材的韧性;随着回火温度的降低,韧性下降,强度提高。二次回火比一次回火组织更加细小,强度和韧性更好;620℃+600℃二次回火后焊接接头具有比较理想的综合力学性能。     

LF6/LD10铝合金搅拌摩擦焊工艺参数对接头性能的影响

通过LF6／LD10铝合金搅拌摩擦焊（FSW）的工艺试验研究，分析了工艺参数对其接头性能的影响。结果表明，当搅拌头的旋转速度值较低时，提高焊接速度有利于提高接头的抗拉强度值。当旋转速度值较高时，提高焊接速度对接头性能的影响不大。焊接速度较低时，改变旋转速度对于接头的力学性能影响不大；焊接速度较高时，提高旋转速度将会降低接头的力学性能。其它参数相同的条件下，材料所处的位置对接头拉伸性能的影响不大。其它条件相同，在焊接速度和旋转速度都较低时，使用无螺纹的搅拌头所得到的接头性能要优于带有螺纹的搅拌头施焊所得接头的性能；在焊接速度和旋转速度都较高时，搅拌针上的螺纹对于接头的力学性能的影响不大。