Actual radial velocity distribution, that have been calculated, indicate that the narrower the annulus, the slower the decrease gradient of the velocity at radia...

• 结果表明,环空间隙越小,其因旋转引起的速度下降沿径向衰减速度越平缓,旋转套管效果越好,证明旋转套管对提高小间隙固井质量意义更大。