A floatcollar is placed at the top of the float joint and a float shoe placed at the bottom to prevent reverse flow of cement back into the casing after placement.
浮箍是放置于浮动接头之上的，而浮鞋则是放置于浮动接头之下，以防止水泥浆回流到套管内。
2
Cement was displaced with pressure indications observed as the top plugs passed through the plug-locator collar and the top wiper plugs bumped on the respective float collars.