In the rigid centralizer series, there is one kind of rigid centralizer which is roller rigid centralizer with rigid body and roller. Generally speaking, the straight blades or spiral blades are machined on the rigid centralizer body according to mud strength and lubricity in the wellbore. It is used in high extended-reach or horizontal well.
Our roller rigid centralizers are processed by casting and then the roller is made of 45# steel which is heat treated to increase wear resistance and centralizer life. The difficult point is that how to put the rollers into the centralizers. As you know, in the casing process, we do not install the rollers on the rigid centralizer body directly during casting. Therefore, the cost and time of roller rigid centralizers is higher and more than other rigid centralizers.