Rigmanufacturer

Under reamer

Construction Features

Its body is made of modified alloy steel, fully heat treated to 285-341 Brinell hardness and 54J minimum impact strength. Connections are cold rolled, phosphatized, coated and equipped with protectors and are gagged to API Standards. Its body is inspected on an ultrasonic control unit over its full length and section. The original cutter and block assembly allows easy replacement of cutters by rig crews.

Cutters

Three different types (T, F and B) of cutters are offered.

Type T: Milled, machined with hardfaced sharp teeth for soft formations.

Type F: Milled, machined with hardfaced flat teeth, for medium hard formations.

Type B: Equipped with pressed-in tungsten carbide buttons, for hard formations

Hole Size (in) Connection HD (mm) Overall Length (mm) Fishing Neck
OD (mm) D1 (mm) L1(mm)
26 7 5/8 Reg. 660.4 3000 254 178 400
17 1/2 7 5/8 Reg. 444.6 2200 228 140 304
12 1/4 6 5/8 Reg 311.2 2000 228 100 300
9 5/8 5 1/2 FH 244.8 1800 178 71 300
8 1/2 4 1/2 Reg. 215.9 1730 165 71 200
8 3/8 4 1/2 Reg. 212.7 1600 165 71 200
8 1/8 4IF 209.00 1600 165 71 200
6 1/8 3 1/2IF 155.00 1470 140 51 200
6 3 1/2IF 152.00 1400 121 51 200
5 7/8 3 1/2IF 149.00 1470 121 51 200
Underreamer