The float shoe prevents reverse flow, or U-tubing, of cement slurry from the annulus into the casing.

浮鞋能够防止环空中的水泥浆向套管内流动这种回流或者U型管效应的发生。

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Such as Annulus testing, casing outer set testing, With tubing bundle testing, etc... Not affect normal production in the course of testing.

如环空测试工艺，套管外固定测试工艺，随油管捆绑测试工艺等。在测试过程中对正常生产没有影响。

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The annulus testing technique, in which the instrument is up and down through the annulus space between the tubing and casing, is regarded as the best testing method at home and abroad.

从抽油井油套环形空间起下下井仪器，直接测试油井生产动态参数的环空测试技术，被公认为是抽油井最佳测试方案。

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