Abstract
With the increasing number of wells with complex operating conditions, the requirements for oil exploration equipment and technology are higher than ever before. Aluminum alloy drill pipe gradually receives good graces because of its light weight, high strength to mass ratio and strong corrosion resistance. This paper calculates different drillstring combinations according to the same horizontal well. It is found that the hook load and total friction resistance of the aluminum alloy-steel drillstring combination are smallest in the horizontal well, and aluminum alloy-steel drillstring combination is the optimal design. This paper studies the dynamic characteristics of aluminum alloy drill pipe by nonlinear finite element method. The simulation results show that rotation speed has a great influence on the trajectory of the aluminum alloy drill string in the vertical section.When the rotation speed is large, the centrifugal force makes the drill string move close to the wall, and the wear of the drill string is intensified. Besides, The moving range of the rotating drill string in the stable inclined section is close to the lower right part of the wellbore. When the WOB is constant, the range and amplitude of the lateral vibration of the drill string in the X and Y directions become larger as the rotational speed increases.
Highlights
With the increasing number of wells with complex operating conditions, the requirements for oil exploration equipment and technology are higher than ever before
This paper studies the dynamic characteristics of aluminum alloy drill pipe by nonlinear finite element method
[5] 杨尚谕.基于深井/超深井的铝合金钻杆设计研究[A].中国 石油集团石油管工程技术研究院(TGRI)、美国石油学会 (API)、中国石油学会石油管材专业委员会、石油管材及装 备材料服役行为与结构安全国家重点实验室.油气井管柱 与管材国际会议(2016)论文集[C].中国石油集团石油管工 程技术研究院(TGRI)、美国石油学会(API)、中国石油学会 石油管材专业委员会、石油管材及装备材料服役行为与结 构安全国家重点实验室:,2016:5
Summary
With the increasing number of wells with complex operating conditions, the requirements for oil exploration equipment and technology are higher than ever before. 目前,由于石油、天然气的消耗量日益增加,油气 资源的勘探对象逐渐由常规油气转向非常规油气。由于 开发对象的转变,超深井、水平井的数量必然会增多, 作业现场对石油勘探开发设备与技术的要求自然也更 高。普通钢质钻杆复杂工况井中常常发生摩擦热裂、应 力腐蚀断裂等事故,影响钻井的速度和效率。而铝合金 钻杆由于其质量轻、强度与质量比大、耐腐蚀性强等特 点[1],已经被广泛使用于俄罗斯的深井、定向井和大陆 架海洋钻井中[2]。 我国对于铝合金钻杆的研究起步较晚[3][4],为了 应对愈加复杂的勘探开发井况,必须认真研究铝合金钻 杆的相关特性。而目前国内对于铝合金钻杆的研究存在 很多局限性:动力学特性方面的研究对象大多为直井或 斜直井[5],没有研究整个水平井的动力学特性;而且, 到目前为止还没有针对现场实际井况的铝合金钻杆设 计方法的研究。复杂工况致使钻柱失效,是钻井施工过 程中一个最为常见且昂贵的井内事故,因此开展钻柱力 学研究具有很重要的意义。笔者使用钢钻柱、铝合金钻 柱和铝合金-钢复合钻柱对所给水平井进行钻柱组合设 计,对比分析三种设计方案的优缺点。同时利用非线性 有限元方法,对铝合金-钢钻柱组合的振动特性及涡动 特性进行分析,从动力学角度解释钻杆容易形成划痕、 发生磨损、钻柱疲劳失效的原因,根据理论研究结果为 合理选择钻井参数提供依据。 可根据Dowson公式计算处于倾斜圆柱孔内低边的圆 柱杆件不发生失稳屈曲的最大压缩载荷[8]: 水平段设计:选取外径127mm,内径108.6mm,线重 284.68N/m,钢级E的钻杆。钢材弹性模量取206GPa,普 通钻杆、加重钻杆惯性矩分别为,5.94×10-6m4,11.11×10-6m4。
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