5 ¼” X-Series

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

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With its 5 ¼” OD, this tool provides for greatly improved capabilities in combination with 6 to 7 ½” drill-bits and even larger under-reamers. The tool has a torsional capacity about double that of a 4 ¾” OD tool. The stroke capacity of 10” or 0.25m gives the tool a working range that makes it an optimal solution for high load performance-drilling. Tomax can provide an adequate overshot with the tool for use in 6 and 6 ¼” hole sizes.

The pressure loss through the tool is 150 psi at 350 GPM or 10 bar at 1300 lpm.

Parameter Metric Imperial
Length 5.64m 18.49’
Max. OD 133mm 5.25”
Min. ID 35mm 1.38”
Connection top NC 38 box NC 38 box
Connection bottom NC 38 pin NC 38 pin

The 5 ¼” X-Series AST has High Torque (HT 38) connections as an option. Based on its torsional capacity and ability to predictably absorb peak loads the tool can provide a great safety improvement when used as a torsional buffer to protect less capable connections further down in the BHA.

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