The float collar is mainly composed of spoiler,floating ball, shell and the basket.The casing float shoe is mainly composed of spoiler,floating ball, shell ,the basket and guide shoe.The cone of spoiler center hole with floating ball can seal fluid reverse. The basket can support floating ball,flush well cycle and adjust performance of the drilling fluid . When cementing job,the basket support the floating ball and float collar is in the conduction state,so fluid can pass through freely.Float collar is back-pressure after running casing and the end of cementing job. Floating ball with sealing face of spoiler can prevent fluid backflow.
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