Introduction：
The hydraulic underreamer is activated by dropping a ball or through differential pressure, with hydraulic force driving the blades to extend from the tool body for underreaming operations. After the operation, reducing the pump flow rate or activating the shifting mechanism retracts the blades.
Features and Benefits：
★ Manufactured from high-strength alloy steel.
★ Laser cladding applied to areas prone to erosion.
★ High-efficiency, long-life blade design.
★ Customized blade design based on formation characteristics.
Type | Max BOD in | Cross-over Connection OD in | Length mm | Reaming Range in | Minimum Applicable Hole Size in | Min. Bore /Ball Size mm | Min. Operating ΔP MPa | MWP MPa | Maximum Temperature ℃ |
Maximum Displacement L/s |
Connection Thread |
HU4500 |
4.5 |
4.125 |
1926 |
4 3/4-5 3/4 |
4 3/4 | φ22/ φ24 |
2.0 |
35 |
175 |
14.5 | NC31 (211×210) |
HU5625 |
5.625 |
5.25 |
2970 |
5 3/4-7 |
5 3/4 | φ28/ φ30 |
2.0 |
35 |
175 |
22.5 | NC38 (311×310) |
HU5800 |
5.8 |
5.25 |
2970 |
6 1/2-7 3/8 |
6 1/8 | φ28/ φ30 |
2.0 |
35 |
175 |
22.5 | NC38 (311×310) |
HU7250 |
7.25 |
6.25 |
3110 |
8/9 |
7 1/2 | φ28/ φ30 |
2.0 |
35 |
175 |
22.5 | NC38 (311×310) |
HU8000 |
8 |
6.5 |
3275 |
8 1/2-10 1/4 |
8 1/4 | φ40/ φ45 |
2.0 |
35 |
175 |
47.5 | NC50 (411×410) |
HU9250 |
9.25 |
7.25 |
3275 |
9 1/2-11 3/4 |
9 1/2 | φ40/ φ45 |
2.0 |
35 |
175 |
47.5 | NC50 (411×410) |
HU10000 |
10 |
8.25 |
3490 |
11-12 1/4 |
10 1/2 | φ54/ φ58 |
2.0 |
35 |
175 |
70 | 6 5/8REG (631×630) |
HU11625 |
11.625 |
8.25 |
3815 |
13 1/2-15 |
12 1/8 | φ54/ φ58 |
2.0 |
35 |
175 |
75 | 6 5/8REG (631×630) |
HU13000 |
13 |
8.25 |
3887 |
14 5/16-16 1/2 |
13 1/2 | φ65/ φ70 |
2.0 |
35 |
175 |
75 | 6 5/8REG (631×630) |
HU16000 |
16 |
9 |
3789 |
17 1/2-20 |
16 1/2 | φ65/ φ70 |
2.0 |
35 |
175 |
75 | 6 5/8REG (631×630) |
