Differential fill up Float CollarOilmecs Differential fill up float Collar is provided with differential valve. Differential fill up Float equipments 90% casing fill up during run-in.use of Differential Collar with Shoe provides additional buoyancy by allowing only 81% casing fill up further enhancing draw work efficiency. A weighted ball is dropped from the surface which converts this valve into a one way cementing valve that allow cement to fill up annulus.