Drag Type Stabilized (DTS)
Utilized for clean out work or small holes and large expansion ratio requirements with a drag type cutter.
DTS - Underreamers
Description
Utilized for clean out work or small holes and large expansion ratio requirements with a drag type cutter.
When using either type of DTS (3.50" or 4.25") in existing pilot holes, the lower blades (optional) are sized to the pilot hole and upper blades dressed to desired hole size. The 1.70" through 3.50" OD tools have lower blades designed to cut all the way to center, which is useful for clean out applications. Cutter blades are size specific with options of PDC, crushed carbide or HOC's ADD cutters.
Features and Benefits
Cutter blades "scissor" out when the piston is forced down by drilling fluid.
Hydraulically expandable with pump pressure.
Tools do not have flow to bottom.
Reverse jetted top subs help to disperse flow.
Internal jet in piston help to regulate pressure.
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