以往的研究中将封隔器封隔元件的剪应力看作均匀分布于胶筒表面 ,而这不能很好地描述实际应力状态。为此 ,按轴向应力线性分布和非线性分布两种情况 ,对封隔元件在压差作用下胶筒与井壁间的剪应力进行了理论分析 ,认为周边剪应力分布受胶筒内轴向应力分布的影响。轴向应力按一次幂函数分布虽然能表达出其应力分布情况 ,但剪应力为一常数 ;而轴向应力按二次幂函数分布来描述其剪应力 ,则剪应力为线性函数分布 ,这就较好地描述了剪应力的分布 In previous studies, the shearing stress of packer packing element was regarded as being uniformly distributed on the surface of the cartridge, which did not describe the actual stress state well. Therefore, according to the linear distribution and non-linear distribution of axial stress, the theoretical analysis is made of the shear stress between the rubber packing and the lining wall under the pressure difference effect of the packing element. The distribution of the peripheral shearing stress is affected by the inner cylinder shaft Impact on stress distribution. Although axial stress distribution by a power function can express its stress distribution, but the shear stress is a constant; and axial stress according to the second power function distribution to describe the shear stress, the shear stress is a linear function of distribution, which The distribution of shear stress is well described