Floating equipment is generally used in the lower section of the well to help:
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- Reduce strain on the derrick while guiding casing past ledges and slough zones in the hole;
- Provide a landing point for bottom and top cementing plugs (pumped ahead of and behind the slurry as part of cementing operations);
- Provide a backpressure valve to prevent cement from flowing back into the inner diameter of the casing after the cement has turned the corner into the annulus and the top plug has been bumped.