共查询到19条相似文献,搜索用时 609 毫秒
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油套管螺纹连接抗粘扣技术的研究现状及展望 总被引:10,自引:0,他引:10
螺纹粘扣作为油套管中最常见的失效形式,一直是国内外冶金和石油系统的研究重点。对油套管粘扣现象作了简单的解释,通过对国际上近20年来油套管螺纹连接抗粘扣技术研究情况的分析总结,归纳了各种关于管螺纹粘扣失效的机理研究、管螺纹参数优化及其检测研究、螺纹脂和螺纹镀层的研究、油套管特殊螺纹连接的研究、油套管上卸扣的操作规范的研究,介绍了其主要研究成果,指出存在的问题,并探讨了进一步开展研究的方向。 相似文献
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接头是油套管产品的重要组成部分之一,也是石油、天然气开采中油套管柱中最薄弱的环节。接头的实体性能、使用性能和经济性是油套管主要指标。介绍了国内外油套管接头的发展:从最初API圆螺纹、长圆螺纹、偏梯形螺纹接头到各个厂家推出的具有各项突出性能的特殊螺纹接头,再回归到具有实用性的经济型油套管接头。介绍了具备密封完整性、结构完整性和重复上卸扣完整性的经济型气密封油套管接头的开发与进展。 相似文献
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API圆螺纹套管接头上卸扣力学性能实验研究 总被引:3,自引:0,他引:3
为了深入了解上卸扣工况对套管接头力学性能的影响,给研究套管接头产生粘扣的力学因素提供实验依据,采用在套管接 头内外表面巾应变片的方法,利用全尺寸上卸扣试验机,对套管接头进行了重复上卸扣实验,测量了接头内外表面应变和上卸扣扭矩。通过实验结果分析,确定了影响接头粘扣的主要力学条件和部件,所确定部件与实际操作过程发生粘扣部件相吻合,采用增大接箍螺纹端部锥度,降低端部接触压力的方法,提高了套管的抗粘扣性能 相似文献
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快速上扣螺纹接头是一种适用于大口径套管的接箍螺纹连接方式,具有对扣容易、上扣效率高、不错扣的特点,特别适合于海上等恶劣环境作业.根据市场需求,宝钢开发出了自主知识产权的快速上扣螺纹接头.介绍了宝钢快速上扣螺纹接头的优化设计过程,利用有限元方法对齿形角、螺纹中径、锥度、连接强度等进行分析,确定了接头的优化结构.开发的快速上扣螺纹接头产品分别在宝钢实验室和西安管研院完成并通过了全尺寸实物性能试验,13.375 in规格已在油田完成下井试验,证明产品的上扣完整性、密封完整性、结构完整性满足油田使用要求. 相似文献
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目前石油套管连接螺纹主要采用两种基本扣型,即偏梯型和圆弧型套管螺纹。其失效形式基本相同。螺纹在使用连接过程中,一但失效其连接强度大幅下降,(出现掉井现象)。 相似文献
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This paper discusses work on the function of the motor cortex as revealed by single cell recordings in monkeys and artificial neural network modelling. Our key conceptual approach both in behavioural neuroscience and neural network modeling of motor cortical function relies on reconstructing, visualizing, and modelling the activity in neuronal populations, indeed a key concept advanced by D. O. Hebb (1949). The behaviour investigated ranges from exertion of isometric force to pointing movements to complex cognitive processing. The functional properties of single cells with respect to the direction of movement in space are described as well as a population code which provides a unique measure for this direction. Finally, the results of modeling studies are discussed in which directional population activity is used as an input to an artificial neural network to drive a simulated arm. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
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The effect of isothermal holdings at 350, 500, 580, 660, and 780°C during heating to various sustenitizing temperatures on the grain size, aging processes, structural and mechanical properties, and the stress-strain curves of 03Kh11N10M2T-VD and 03Kh11N8M2F-VD maraging steels with 0.002% B is studied. X-ray diffraction analysis and metallographic examination are performed, and the corrosion and fatigue characteristics of these steels are determined. At the aged state with the maximum strength, the steels exhibit no strain-hardening ability upon tension and retain a high local plastic deformation during necking (ψ ≤ 60%). Preliminary thermal-cycling treatment at 500–800°C causes grain refinement and increases the plastic properties of the steels (the uniform elongation increases to 20%). Isothermal holding during heating to the austenitizing temperature affects an elastoplastic transition at a low tensile strain. 相似文献
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A subset of cytokine mediators belonging to the tumor necrosis factor (TNF) family cause apoptosis, acting through receptors and signaling pathways that have recently come to light. Further, at least one autoimmune disease results from a defined defect of apoptosis (mutations of the Fas ligand or its receptor). It is offered that many, and perhaps most autoimmune diseases may result from primary defects of apoptosis. Such defects may cause reflexive overproduction of TNF and other pro-apoptotic cytokines. The collateral damage produced by these mediators may be of pathogenetic importance in complex autoimmune disorders such as rheumatoid arthritis and Crohn disease, wherein TNF blockade is known to have ameliorative effects. 相似文献
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通过分析螺纹轴齿形成形过程,并结合金属流动特点,获得楔横轧梯形螺纹轴的成形机理.考虑到轧制过程轧件螺旋升角瞬时变化特点和成形段齿形截面变化等因素设计了楔横轧模具,采用有限元分析软件Deform-3D对楔横轧梯形螺纹轴齿形成形过程进行模拟,得到精度较高的梯形螺纹轴轧件.利用有限元点跟踪功能,对轧件多个点进行跟踪,详细分析了轧件螺纹不同位置各点的径向、轴向位移变化情况,从中获得螺纹段各处金属流动规律.采用软件模拟参数进行了相应的楔横轧实验,得到的梯形螺纹轴实验轧件与有限元模拟结果相同.模拟和实验结果表明,模具螺旋升角采用轧件瞬时半径对应螺旋升角时,能够轧制出形状精确的螺纹轴. 相似文献