The Drill String Torque Reducer (DSTR™) is a drill string tool intended for use in deviated wells where excessive rotary torque causes drilling and casing wear problems. The DSTR™ tool can reduce casing wear across the build section. For a given deviation profile, the applications program assists in maximizing the tool’s performance by determining the deployment in the critical sections of the borehole. For most extended reach drilling (ERD) applications, the tools are used in the build sections of the borehole, helping to extend the envelope of rotary drilling.


Watch an animation on the DSTR™ tool:

  • 5-in., 5 1/2-in., 5 7/8-in. and 6 5/8-in. sizes
  • Reduces friction factor and casing wear
  • Can withstand 14,000 lbf side force
  • One piece mandrel with mechanical properties exceeding the specification of the drill pipe
  • Overall dimensions permit use within standard drilling stand and average derrick height
  • Improves reliability and integrity under severe downhole conditions
  • Dual sleeve retention mechanism provides downhole reliability
  • Designed for cased and open hole applications

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