水平井眼中管柱变形方程的实验仿真

以已有的三维井眼中管柱正弦屈曲和螺旋屈曲行为分析模型软件为基础 ,根据物理相似原理 ,设计了井眼中管柱屈曲变形的小尺寸模拟实验装置 .通过改变管柱变形微分方程中包含的无因次轴力 β、无因交摩擦及数 γ1和无因次轴力分布系数 γ2 的值 ,利用该装置对管柱在水平井中的临界载荷、载荷传递效率、变形效应等进行模拟实验 .试验结果表明 :钻压传递、位移与载荷的实验结果与理论计算值之间的最大差值不超过 1 0 % ,临界屈曲载荷的理论值与实验值之差不超过 6% .本文的结果可为修正理论模型提供指导 ,使理论模型能更好地指导现场的油井管柱施工作业

Experimental simulation of the buckling equation of a pipe string in horizontal borehole

According to physical similitude principle, a small-scale simulator of pipe string buckling in 3-D borehole is designed. Load transfer efficiency, displacement - load relationship and critical buckling loads of the pipe string in a horizontal borehole are studied on the simulator by changing dimensionless axial force β, dimensionless friction factor γ 1 and dimensionless axial force distribution factor γ 2. It is show that the differences between experimental load transfer curve and displacement-load curve and theoretical ones are all less than 10%, the difference between experimental critical buckling loads andtheoretical ones is less than 6%. The result can guide the revision of the theoretic model for pipe string buckling.