水平井完井管柱振动特性实验研究

An Experimental Study on Vibration Characteristics of Horizontal Well Completion String

为探索气体作用下完井管柱振动响应机理,开展了水平井完井管柱在开井工况下振动相似实验。实验采用PE管模拟完井管柱油管,采用透明的亚克力管模拟完井套管,并采用Froude相似准则进行尺寸缩放;基于应变片测试技术采集气体作用下完井管柱油管在水平和垂直方向的振动,并采用模态分析法分析了管柱应变、位移响应及振动模态。通过有限元分析管柱固有频率并与实验振动频率对比发现,管柱振动频率接近三阶固有频率,且会发生共振;实验管柱系统在弯曲段响应应力、位移量较大,振动较为剧烈;管柱在水平方向与垂直方向振动频率与模态一致,水平方向振动剧烈。

In order to explore the vibration response mechanism of the completion string under the action of gas,the horizontal well completion string vibration test was carried out under the open well condition.PE pipe was used to simulate completion string,transparent acrylic pipe was used to simulate completion casing,and Froude similarity criterion was used for dimension scaling.The horizontal and vertical vibration responses of completion string is tested based on strain gauge test technology,and the strain,displacement response and vibration modes ofthe string were analyzed by modal analysis method.Through the finite element software analysis ofthe natural frequency of the string and the comparison with the experimental vibration frequency,it is found that the vibration frequency of the string is close to the third-order natural frequency and resonance occurs.The response stress,displacement and vibration ofthe test string system are large in the bending section.The vibration frequency of the string in the horizontal direction and the vertical direction is consistent with the mode.