Underreamer Catalog Download

Our Underreamers can be opened up anywhere down the hole and as many times as needed but, you must have adequate annular space for the blades or rollers to open up. Most drillers pull the casing up 3 or 4 feet and lower the underreamer below the casing and then open the tool and start drilling. The tools operate with either air or fluid pressure and require as little as 60 – 100 lbs. of pressure to force the cutter arms out. The bodies and cutter arms are manufactured from heat-treated steel. The piston is carbonized steel to reduce abrasion and features a replaceable tungsten carbide jet nozzle to adjust to your individual compressor or mud pump output. Additional circulation holes have been added to the side of the piston body to keep the cuttings out of the cutter slots. The simple, rugged design features easily replaced components for the long term, trouble free operation. The operation of our Underreamers is very simple. The tool is hydraulically operated by pump pressure which forces a spring loaded actuating piston downward. A cam attached to the lower end of the actuating piston forces the cutter arms out to the desired cutting diameter. When the pump pressure is shut off, a coil spring forces the piston upward causing the cutter arms to retract back into the body.

We can custom manufacture an underreamer to meet your individual requirements.

 

Underreamer Catalog Download