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SPR MARK II render

Tolteq Symmetric Propagation Resistivity MARK II Tool

Real-time LWD resistivity combined with advanced, high-bandwidth MWD tools.

  • Description Description
  • Resources Resources

The Tolteq™ symmetric propagation resistivity (SPR) MARK II tool offers real-time logging-while-drilling (LWD) resistivity combined with advanced, high-bandwidth measurement-while-drilling (MWD) tools. The tool creates high-quality resistivity logs with both phase and attenuation measurements in real time—measurement capabilities as well as multiple depths of investigation and vertical resolutions help with the drilling process. With a total of eight curves recorded into memory, the SPR MARK II tool has extremely high-resolution memory data with fast data dump capability. This feature enables our field operators to create high-resolution logs after the run is complete with no impact on drilling time. The eight resistivity measurements can be further enhanced by applying borehole corrections in ToolTracker™, a user-friendly data handling application.

The SPR MARK II features many upgrades including an increased temperature rating of 160˚C for high temperature applications, a more durable design that increases tool life in harsh applications, and a new universal surface kit for easier rigsite operation. In addition, the SPR MARK II offers a rugged, fixed connection option based on the proven SureMate™ interconnection for reliable performance in challenging drilling conditions, while an improved wet connect provides a rapid deployment option. The tool is now available as an integrated option with the NOV™ VectorZIEL™ rotary steerable system (RSS).


  • High-quality, real-time LWD data enhances well placement
  • Multiple depths of investigation
  • Symmetric design for improved data quality
  • Borehole correction data
  • Low-maintenance, reliable design
  • Integration with Top Mount Pulser allows for short bit to gamma and bit to resistivity distance
  • Easily removable and replaceable hard-faced wear bands for cost effective operation in abrasive environments

For more information, email [email protected]

  • Tolteq Symmetric Propagation Resistivity MARK II Tool Spec Sheet

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Looking for more? Log in to our Tolteq Hub for additional information, contact our product support groupor submit a repair request and one of our representatives will follow up with you directly. You can also explore our Tolteq release notes to stay up to date on new product features and fixes.

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Interested in adding this product to a custom directional BHA? Visit nov.com/DirectionalTechnology to learn more or contact us at [email protected].

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