Three sets of arms with hard faced rollers at the pivot point are mechanically linked and spring loaded to provide a constant radial force through the full operating diameter. Both upper and lower collars are free to slide on the mandrel to avoid any wedging action. Additional linkage is fitted to the upper arms; this changes the mechanical advantage, affecting closing force requirements when the tool is being pulled up into a restriction.
4-arm Production Roller Centralizer
Each arm has twin rollers which are optimized to give high centering and ultra low rolling frictional forces. The linked pairs of arms ensure accurate positioning while providing an even radial force through the full operating diameter.
To reduce the force required to pull the tool to its minimum diameter, special features are added to the arm profile. The 4-arm Production Roller Centraliser is hard wearing and suitable for Slickline operations.
6-arm Production Roller Centralizer
These six sets of arms provide a constant radial force through the full operating diameter. Both upper and lower collars are free to slide on the mandrel to avoid any wedging action. The rollers enable passage down the well with minimum friction. This tool can also be used as a tubing end locator by observing line tension when pulling into the tubing.
Production Springbow Centralizer
In open hole completed wells the springs enable smooth passage down the well with minimal damage to the formation. The tapered shape of the tool makes it easier to pull into the tubing from casing. Large diameter changes may also be passed through with minimum friction.