钻柱与实钻水平井眼接触形态及摩阻影响分析

发布时间：2019-06-03 04:55

【摘要】：水平井钻进过程中,地层结构、钻具振动、钻头侧向力、岩屑沉积等因素易导致实钻井眼轨迹发生连续小幅偏斜。该种偏斜虽不会引起实钻井眼轨迹的严重偏离,但将改变钻柱与井壁的接触形态。受现有测井方法的限制,该种偏斜常被忽略。通过理论分析与仿真,研究水平段井眼轨迹在井斜平面内连续小幅偏斜波动条件下的钻柱与井壁接触形态及其对摩阻的影响。研究认为,钻柱与偏斜波动水平井眼间易发生"悬跨"接触,该现象降低了现有解析法求解钻柱力学相关问题假设条件"钻柱与井壁连续接触"的合理性。钻柱自重和轴向力对悬跨钻柱弯曲位移及悬跨接触最大临界跨距的影响最大。悬跨接触将减小钻柱与井壁的接触面积、增大钻进摩阻。
[Abstract]:In the process of horizontal well drilling, formation structure, drilling tool vibration, bit lateral force, cuttings deposition and other factors can easily lead to continuous small deviation of drilling hole trajectory. Although this kind of deviation will not cause serious deviation of drilling hole trajectory, it will change the contact form between drill string and wellbore. Limited by the existing logging methods, this kind of deviation is often ignored. Through theoretical analysis and simulation, the contact form between drill string and wellbore and its influence on friction are studied under the condition of continuous small deviation fluctuation in inclined plane of horizontal section. It is considered that the "suspended span" contact between the drill string and the deviated horizontal well is easy to occur, which reduces the rationality of the existing analytical method for solving the mechanical problems related to the drill string, "the continuous contact between the drill string and the wellbore". The self-weight and axial force of drill string have the greatest influence on the bending displacement of suspended span drill string and the maximum critical span of suspended span contact. The suspended span contact will reduce the contact area between the drill string and the shaft wall and increase the drilling friction.
【作者单位】：西南石油大学机电工程学院;西华大学流体及动力机械教育部重点实验室;"煤矿灾害动力学与控制"国家重点实验室·重庆大学;
【基金】：国家自然科学基金(51134004)
【分类号】：TE243

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