铝合金钻杆抗扭性能研究

发布时间：2018-08-08 17:18

【摘要】：石油钻杆是石油天然气勘探和开采中的重要设备,传统的钢制钻杆存在很多问题：如耐腐蚀性能差、大钩负载过大等。铝合金钻杆具有比强度(断裂强度极限与相对密度之比)高、重量轻、与井壁摩擦阻力小、弯曲应力小、有效防止H2S和CO2的腐蚀等优点,在某些井况下,铝合金钻杆具有更大的优势。我国对铝合金钻杆的研究起步很晚,目前还没有大范围推广铝合金钻杆产品,主要原因在于：铝合金材料及力学性能研究有待完善；抗扭性能较弱且没有成熟的分析计算公式；铝合金钻杆接头采用过盈装配,装配条件要求更高。影响铝合金钻杆抗扭性能的主要取决于钻杆接头的抗扭性能,本文从钻杆接头的装配过盈量入手研究钻杆的抗扭性能。由于铝合金钻杆与普通钢钻杆在结构、材料、装配方式上具有明显的不同,文章分析了国内外对铝合金钻杆的研究现状,并从材料力学性能和抗扭的原理角度分别对铝合金钻杆和钢钻杆进行了对比。结合已有的分析计算方法,以厚壁圆筒的过盈连接计算为基础,对铝合金钻杆接头的过盈连接进行分段的微元解析计算,并对计算公式进行了统一,尽量减少计算参数,提高计算的可操作性和实用性。使用有限元分析软件MSC.MARC建立铝合金钻杆接头的有限元模型,模拟装配,对装配扭矩、接触压力、各螺纹牙承担的作用力、应力集中系数及积分强度这五个参数进行综合对比,选出接头综合性能最优的装配过盈量。通过热装配的试验及卸扣试验,对模拟的结果进行验证。使用有限元模拟的方法对热装配进行了分析,从而定量地分析了热装配过程中铝合金接头的温度变化和热变形情况,对热装配试验具有一定的指导作用。本文的研究成果对铝合金钻杆开发过程中决定抗扭性能的关键性装配过盈量问题的解决具有重要的指导意义,样品试验与有限元模拟相结合的分析方法,对后续的铝合金钻杆的进一步开发和推广使用将会提供有益的技术支撑。
[Abstract]:Oil drill pipe is an important equipment in oil and gas exploration and exploitation. There are many problems in traditional steel drill pipe, such as poor corrosion resistance, excessive load of hook and so on. Aluminum alloy drill pipes have the advantages of high specific strength (ratio of fracture strength limit to relative density), light weight, small friction resistance with shaft wall, small bending stress, and effective protection against corrosion of H 2S and CO2. Aluminum alloy drill pipe has more advantages. The research on aluminum alloy drill pipe started very late in our country, but it has not been popularized widely at present. The main reasons are that the study of aluminum alloy material and mechanical properties need to be improved, the torsion resistance is weak and there is no mature formula for analysis and calculation. Aluminum alloy drill pipe joints adopt interference assembly, the assembly conditions are higher. The torsion resistance of aluminum alloy drill pipe is mainly determined by the torsion resistance of the drill pipe joint. In this paper, the torsion resistance of the drill pipe is studied based on the fitting interference quantity of the drill pipe joint. Because aluminum alloy drill pipe is different from ordinary steel drill pipe in structure, material and assembly mode, this paper analyzes the research status of aluminum alloy drill pipe at home and abroad. From the point of view of mechanical properties and torsion resistance of materials, the aluminum alloy drill pipe and steel drill pipe are compared respectively. Based on the calculation of interference connection of thick-walled cylinder, the interference joint of aluminum alloy drill pipe joint is calculated by micro-element analysis, and the calculation formula is unified to reduce the calculation parameters as far as possible. Improve the maneuverability and practicability of calculation. The finite element analysis software MSC.MARC was used to establish the finite element model of aluminum alloy drill pipe joint. The assembly torque, contact pressure, the acting force of each thread tooth, the stress concentration factor and the integral strength were compared synthetically, and the assembly torque, the contact pressure, the stress concentration factor and the integral strength were compared. Select the assembly interference which has the best comprehensive performance. The simulation results are verified by thermal assembly test and unloading test. The finite element simulation method is used to analyze the thermal assembly, and the temperature change and thermal deformation of aluminum alloy joints during thermal assembly are quantitatively analyzed, which can be used as a guide for the thermal assembly test. The research results in this paper have important guiding significance for solving the problem of critical assembly interference during the development of aluminum alloy drill pipe, and the analysis method combined with sample test and finite element simulation. It will provide useful technical support for the further development and popularization of aluminum alloy drill pipe.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE921.2

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