注入头管块夹持提升系统受力及结构分析

Force and Structure Analysis of Tube-Block Clamping on Coiled Tubing Injection

建立了注入头提升油管时的管块夹持模型,利用美国API厚壁筒理论和畸变能密度理论,对其受力进行分析,计算出夹持块对油管的夹紧力和链条对夹持块的临界提升力与当量摩擦系数之间的明确相关关系,得到了增大当量摩擦系数可以提高夹持效果的结论,并分析了当量摩擦系数的合适范围.利用得到的结论,文章研究了增大量摩擦系数的方法,并通过ANSYS有限元分析,得出了具有圆弧形结构、沟槽型夹持面的夹持块夹持效果较好.

The model of tube-block clamping is established, and the force is analyzed using the API of thick wall cylinder theory and distortion energy density theory. The relationship between the critical clamping force and the equivalent friction coefficient is calculated, together wit the relationship between the critical lifting force and the equivalent friction coefficient. The results show that increasing the coefficient of friction can improve the effect of clamping with appropriate range of friction coefficient. The method of increasing equivalent friction coefficient is proposed, and the circular structure and groove type clamping block have better clamping effect with smaller tubing damage.