Spiral  VaneRoller  Centralizer consists of rigid body, on which  machined spiral vanes. There are modified alloy steel, fully heat  treated rollers fixed on every spiral vanes. Because of rigid body and  rolling friction between the rollers and inside of well or casing. The  capability of the roller Centralizer is better than others of all. 
Roller centralizersAre mainly used for big high Roller, high  deviated wells and horizontal wells, to centre casings.Roller Centralizers can also remove wellbore cake and  improve mud replacement efficiency etc.Roller Centralizers provide superior wear  resistance and have been proven to remain functional throughout the life  of the well and can aid in casing/tubing retrieval.
Precision-machined inside diameter fits over the casing through the complete API tolerance  range, providing excellent rotational performance in mud.
When running casing through open hole, the system's smaller roller-contact area  reduces the risk of differential sticking and maintains standoff.the roller/axle relationship ensures that axle shear  stresses remain within elastic limits, preventing permanent deformation.  
Axles areCrimped in place, eliminating the welding process, while  ensuring the rollers cannot break free and fall into the wellbore. the  system's high-quality construction materials improve  high-pressure/high-temperature capabilities.
Roller CentralizersAre available in sizes 4?" to 20".Any special sizes are available on request.