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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 is the largest OD tool in the fleet.

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The tool is designed for top-hole drilling as well as directional work in hole sizes down to 12 ¼” due to its high bending capacity. The 9 ½” tool is internally characterized by its massive helix section that provides for safe transformation of impact loads when mitigating vibrations and stick-slip from large diameter reamers and hole-opener wings from floating rigs and drillships.

The 9 ½” tool can be configured for very high continuous torsion and compression load. The inner diameter is 2,83” and presents no restrictions to drop-balls. The pressure loss through the tool is minimal (less than 30 psi at 1200 GPM or 2 bar at 4500lpm).

ParameterMetricImperial
Length5.00 m17.85 ft
Max. OD241 mm9.5”
Min. ID72 mm2.83”
Connection topAPI 7 5/8 REG boxAPI 7 5/8 REG box
Connection bottomAPI 7 5/8 REG pinAPI 7 5/8 REG pin
Tomax anti stick slip downhole tool 9 ½” X-series
The 9 ½” X-Series AST is the largest tool in the fleet. It capability makes it a perfect solution to speed up top-holes and drilling operations that uses large under-reamers.
Oilwell drilling is frequently undertaken in areas where the drill-bit is at risk from unpredictable ocean conditions combined with contrasting underground sediments. The 9 ½” XC-AST is called to all ends of the world to reduce risk and save time in such operations.

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