摘要
目前对抽油杆柱产生多次螺旋屈曲变形的临界力、屈曲变形后偏磨点的位置、抽油杆柱屈曲变形后的杆柱形状及屈曲变形规律还没有一个统一而完整的认识。为此 ,建立了抽油杆柱屈曲变形时的微分方程 ,在考虑整个抽油杆柱及其两端约束条件的基础上 ,推导出垂直井筒中抽油杆柱产生多次屈曲时轴向临界力及偏磨点位置的计算公式 ,绘制出垂直井筒中抽油杆柱多次屈曲变形时的图形。研究分析表明 ,抽油杆柱最大弯曲变形始终发生在中和点附近 ,并且随抽油杆屈曲次数的增加 ,各波形顶点下移 ,波长变短 ,同时屈曲变形的临界载荷也增大。
Differential equation describing helical bulking inflection of the sucker rod string is established. Considering full length and end constrains of the sucker rod string, equations calculating critical force caused by multiple time helical bucking inflection of the sucker rod and position of the eccentric abrading point in vertical well are presented and figures illuminating helical bucking inflection are drawn. The figures show that maximum bulking inflection always occurs near the neutral point, peaks of each wave descend and wavelength shorten and critical force increase with increasing times of bulking inflection.
出处
《石油机械》
北大核心
2002年第8期17-19,2,共3页
China Petroleum Machinery
关键词
抽油杆柱
稳定性
研究
幂级数
中和点
偏磨点
sucker rod string stability power progression neutral point eccentric abrading point
