实践表明，受到井壁约束的钻柱具有两种基本的屈曲形态：蛇形屈曲（Snake Buckling）或正弦屈曲和螺旋屈曲（Helical Buckling），在实际井中也存在兼有两种基本形态的混合屈曲形态，属非线性屈曲问题。
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Deformation of helical buckling appeared on rod during down stroke is also analyzed.
同时分析了下冲程抽油杆所产生的螺旋弯曲变形。
Established string sinusoidal buckling of helical buckling CFD models and high-yield Wells sand production erosion tubing model.
建立了管柱螺旋屈曲和正弦屈曲的CFD模型和高产气井出砂时砂粒对屈曲油管的冲蚀模型。
It manly analyzes four kinds transmutations of piston effect, temperature effect, expansion effect, helical buckling effect in the system of tubing and packer.
针对油管柱—封隔器系统的活塞、螺弯、温度、鼓胀等四种基本效应进行分析，同时根据现场工艺特点进行了温度场和压力场的研究。
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