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).

Parameter Metric Imperial
Length 5.0m 16.40’
Max. OD 241mm 9.5”
Min. ID 72mm 2.83”
Connection top API 7 5/8 REG box API 7 5/8 REG box
Connection bottom API 7 5/8 REG pin API 7 5/8 REG pin

9-5-tool

With an extremely strong helical section, the 9 ½” tools can be configured for very high continuous torsion and compression load. Compare ASTs for the standard and optional configurations.

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