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Anti stick-
slip
tool

The Anti Stick-slip Tool (AST) from Tomax ensures stable loading of PDC bits in all kinds of rock. This allows the cutters to cross boundaries with minimal waste of energy and low risk from vibrations.

Autonomous regulation of the drill-bit interface has proven useful for drillers aiming for continuous improvement of operational efficiency.

The millisecond response of the AST reduces losses to friction at the rock interface. This leaves more energy available to cut rock faster and at the same time reduces cutter heat and, consequently, wear.

12,000+

Tomax has contributed to more effective drilling in more than 12,000 wells around the world.

Tomax AST downhole tool size 4 ¾” x-series

4 ¾”

X-Series

Tomax AST downhole tool size 5 ¼” x-series

5 ¼”

X-Series

Tomax AST downhole tool size 6 ¾” x-series

6 ¾”

X-Series

Tomax AST downhole tool size 7” c-series

7’’

C-Series

Tomax AST downhole tool size 8 ¼” x-series

8 ¼”

X-Series

Tomax AST downhole tool size 9 ½” x-series

9 ½”

X-Series

Downhole tool sizes

Use of the AST requires no changes to standard drilling practices. The tool has a wide working range which eliminates the need for service personnel.

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Tomax employees showing the finished AST tool in the warehouse in Norway

PLACEMENT
IN BHA

The standard placement of the AST tool is on top of the non-magnetic portion of the BHA. This is the same for rotary steerable systems, downhole motors and rotary assemblies.

BHA configuration examples for RSS/Under Reamer BHA RSS/LWD BHA and motor BHA. For hard rock and high friction formations, a roller reamer above the AST is recommended.

Documents
FAQ
  • Tomax anti stick slip downhole tool 4 ¾” X-series

    Tomax 4 ¾” X-Series AST

    The “X” means extra flexible and the 4 ¾” OD tool has a comprehensive service history from both multi-lateral producers…

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  • Tomax anti stick slip downhole tool 5 ¼” X-Series

    Tomax 5 ¼” X-Series AST

    The “x” means extra flexible and reflects an extensive operational capability in terms of drilling parameters and well curvature.

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  • Tomax anti stick slip downhole tool 6 ¾” X-series

    Tomax 6 ¾” X-Series AST

    This tool is the most used in the AST fleet and has an extensive service record that includes coring, milling…

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  • Tomax anti stick slip downhole tool 7” C-series

    Tomax 7″ C-Series AST

    The “C” means combi and reflects an extensive capability in terms of both radius of turn and lateral reach. This…

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  • Tomax anti stick slip downhole tool 8 ¼” X-series

    Tomax 8 ¼” X-Series AST

    The “X” means extra flexible and reflects an extensive operational capability in terms of drilling parameters and well curvature.

    Read More

  • Tomax anti stick slip downhole tool 9 ½” X-series

    Tomax 9 ½” X-Series AST

    The “X” means extra flexible and reflects an extensive operational capability in terms of drilling parameters and well curvature. This…

    Read More

  • Tomax anti stick slip downhole tool tt-series

    Tomax TT-series AST

    The TT (Thru Tubing) Series AST has been in service since 2006 and is aimed at eliminating motor stalls as…

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