| 非均匀载荷和内压作用下石油套管的抗挤能力分析 |
| 投稿时间：2017-02-02 修订日期：2017-02-02 点此下载全文 |
| 引用本文：周雄,林国庆,钟莹莹,等.非均匀载荷和内压作用下石油套管的抗挤能力分析[J].钻探工程,2017,44(8):76-80.ZHOU Xiong,LIN Guo-qing,ZHONG Ying-ying,et al. Analysis on Anti-collapse Ability of Oil Casing under External Non-uniform Load and Internal Pressure[J]. Drilling Engineering, 2017,44(8):76-80. |
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| 基金项目:广西高校中青年教师基础能力提升项目（编号：KY2016LX440）；广西高校北部湾石油天然气资源有效利用重点实验室开放课题基金（编号：2015KLOG08） |
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| 中文摘要:油井套管往往处于管内外复杂的受力环境下，揭示和分析这些因素对套管抗挤能力的影响就显得非常重要，并可为套管强度设计提供理论依据。根据套管在受到外部非均匀载荷和内压作用下的受力特点和材料力学理论，建立了单位长度的理想圆管的环向应力的计算模型，得到了套管内外壁的环向应力分布规律。计算结果表明：套管发生破坏失效位置在圆周方向与最大水平地应力成90°角的内壁上。依据Von Mises屈服准则由失效点得到了非均匀外挤载荷和内压作用下套管屈曲时抗外挤能力的新公式。实例计算表明：在影响套管的抗挤能力的因素中，外载荷的非均匀系数对套管抗外挤能力影响最大，外载荷的非均匀系数越大，套管抗外挤能力下降得越快；在外载荷非均匀性较小的条件下，提高套管外载荷承载能力可通过增大内压和减小套管径厚比来实现。 |
| 中文关键词:非均匀载荷 内压 环向应力 破坏失效位置 抗外挤能力 径厚比 |
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| Analysis on Anti-collapse Ability of Oil Casing under External Non-uniform Load and Internal Pressure |
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| Abstract:Oil casing is usually under the complicated internal and external stress environment. The study and analysis on the influence of these factors on casing collapse resistance ability are very important, which can provide theoretical basis for casing strength design. Based on the stress characteristics of casing under external non-uniform load and internal pressure and the theory of material mechanics, a calculation model of hoop stress of ideal casing at unit length is established, the distribution regularity of hoop stress of internal and external casing surfaces is revealed. The calculation shows that the yield failure point is at the internal surface in circumferential direction of 90 angle with maximum horizontal crustal stress. A new formula of external collapse resistance ability under non-uniform external collapse load and internal pressure during casing buckling is derived from the failure point by Von Mises yield criterion. Calculation examples show that non-uniformity coefficient of external load has the greatest impact on external collapse resistance ability among all the influence factors on collapse resistance ability of casing. The larger the non-uniformity coefficient of external load is, the faster the collapse resistance ability of casing declines; under less external load non-uniformity, the external load bearing capacity of casing can be improved by increasing the internal pressure and decreasing casing diameter-thickness ratio. |
| keywords:non-uniform load internal pressure hoop stress yield failure point external collapse resistance ability diameter-thickness ratio |
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