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 5.64 m 18.49 ft
Max. OD 133 mm 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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