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中文摘要：
根据管柱扭转变形的特性,设计了8种水垂比情况下的大位移井管柱卡点预测实验,并对每种水平比下的管柱进行了3次扭转实验.对实验数据进行处理,用回归分析方法确定实际卡点位置与理论卡点位置的比值与水垂比间的函数关系,并建立基于剪切胡克定律的大位移井卡点预测计算式.结果表明：水垂比对大位移井管柱的加载特性有较大影响,它综合反映了管柱接头、管柱与井壁和套管的摩擦效应;未经修正的卡点计算公式平均相对误差达到24.67％,修正后的卡点预测公式的平均相对误差小于4.0％.建议应对大位移井摩阻扭矩进行分段计算.
英文摘要：
Predicting stuck-point is one of the key techniques for releasing the downhole tubular string. It is more difficult to predict the stuck-point in extended reach well because of the long horizontal section, complex stress for tubular string and hard reaching for instrument of stuck-point detection. In terms of the characteristic of torsion deformation of tubular string, 8 kinds of experiments, which possess different ratios of horizontal displacement and vertical depth （A） , are designed to predict the stuck-point of tubular string in extended reach well. For each, torsion experiment of tubular string is carried 3 times. The function relationship between theoretical stuck-point and real one is set up with the method of regression analysis. The equation based on the Hook~ law is established to predict stuck-point in the extended reach well. The experimental results show that the loading characteristic of pipe string is influenced by, and it reflects synthetically the friction effects of tubular string and their joints with the wall of well and casing. The average relative prediction error is 24.67% with the calculation equation which is not modified, and average relative prediction error is lower than 4.0% with the modified equation. It is suggested that the drag and torque should be calculated segmentally in extended reach well.
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