| 井斜角与摩擦对连续油管正弦屈曲的影响研究 |
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| 引用本文： | 龚银春,艾志久,付必伟,汤海平.井斜角与摩擦对连续油管正弦屈曲的影响研究[J].中国安全生产科学技术,2016,12(10):50-55. |
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| 作者姓名： | 龚银春 艾志久 付必伟 汤海平 |
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| 作者单位： | （西南石油大学 机电工程学院, 四川 成都 610500） |
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| 摘 要： | 为了避免连续油管井下屈曲行为的产生，进而导致井下作业事故，开展了井下管柱正弦屈曲行为的研究。根据最
小势能原理建立了一个复杂的井下管柱正弦屈曲模型。在考虑摩擦的情况下，构建了斜井中的管柱屈曲微分方程组。通
过对屈曲微分方程组进行无量纲化处理，使方程组能独立于井下泥浆、井眼尺寸和管柱形式而存在。最后，采用虚功原
理研究了摩擦与井斜角对正弦屈曲临界载荷的影响。研究结果显示，正弦屈曲临界载荷将随着摩擦系数的增加而增加。
此外，随着井斜角的增加，正弦屈曲临界载荷也将不断增加。该研究结果可为连续油管预防井下作业事故的发生提供理
论性指导。
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| 关 键 词： | 摩擦 井斜角 连续油管 正弦屈曲 |
Study on influence of inclination angle and friction on sinusoidal buckling of coiled tubing |
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| GONG Yinchun,AI Zhijiu,FU Biwei,TANG Haiping.Study on influence of inclination angle and friction on sinusoidal buckling of coiled tubing[J].Journal of Safety Science and Technology,2016,12(10):50-55. |
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| Authors: | GONG Yinchun AI Zhijiu FU Biwei TANG Haiping |
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| Affiliation: | School of Mechanical Engineering, Southwest Petroleum
University, Chengdu Sichuan 610500, China |
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| Abstract: | In order to avoid the downhole buckling of coiled tubing, which may lead to downhole operation
accident, the study on sinusoidal buckling of downhole string was carried out. A complicated sinusoidal
buckling model of downhole string was established based on the principle of minimum potential energy.
The differential equations of string buckling in inclined shaft were constructed considering the
friction and treated with dimensionless method to enable the equations existing with independence of
downhole mud, wellbore size and string type. Finally, the principle of virtual work was applied to study
the influence of friction and inclination angle on critical load of sinusoidal buckling. The results
showed that the critical load of sinusoidal buckling increases with the increase of friction
coefficient. In addition, with the increase of inclination angle, the critical load of sinusoidal
buckling also presents an upward trend. It can provide theoretical guidance to the prevention of
downhole operation accidents for coiled tubing. |
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| Keywords: | friction inclination angle coiled tubing sinusoidal buckling |
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