定向井管柱的屈曲行为及其对轴向力的影响

定向井管柱的屈曲行为及其对轴向力的影响(中文6400字,英文4400字)
摘要
关于直井、水平井和弯曲井中的管道屈曲和后屈曲行为的研究实验是由塔尔萨大学完成的。实验研究了在有、无静态的内部压力两种情况下轴向力的传递，同时还研究了不同阶段的屈曲现象及其有关的轴向力，不同管径（1/4”和3/8”）的管底的支持条件。实验结果表明屈曲载对不同管径的管底的支持状态起很大作用。静态内部压力，对管柱屈曲行为的影响似乎是微不足道的。
简要回顾了最近开发的预测管柱在斜井，弯曲井和水平井的屈曲行为的的数学模型，目前的理论已经应用到最近开发的计算机模拟中。理论分析的结果已证实计算机模拟的多功能性和有效性能够更好地了解和解决屈曲相关领域的问题。

The Buckling Behavior of Pipes and Its Influence on the Axial Force Transfer in Directional Wells
E. Kuru, SPE, A. Martinez, SPE, and S. Miska, SPE, The University of Tulsa, and W. Qiu*, SPE, Baker Oil Tools
Abstract
An experimental set-up was built at the University of Tulsa to study buckling and post-buckling behavior of pipes constrained in a straight horizontal and curved wellbores. Experiments were conducted to investigate the axial force transfer with and without static internal pressure. Different stages of buckling phenomena and their relation to the axial force, the pipe diameter (1/4” and 3/8”) and the pipe endsupport conditions have also been investigated. Experimental results have shown that the buckling load is a strong function of the pipe diameter and the pipe end-support conditions. Static internal pressure appears to have insignificant influence on the buckling behavior of pipes.

A brief review of recently developed mathematical models to predict buckling behavior of pipes in inclined, curved and horizontal sections of wellbore is also presented. Applications of the current theory are presented by using recently developed computer simulator. Results of the theoretical analysis have confirmed the versatility and effectiveness of computer simulator for better understanding and solving buckling related problems in the field.

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