Downhole Tools
Downhole Junk Sub for Debris Collection
During drilling process, Junk sub is applied mainly for fishing of shivers and fallen objects such as carbide tooth, drill bit and bearing which cannot be carried out of hole by conventional fluid circulation, It possesses important functions to keep hole cleaning, increase bit service life, reduce and prevent drill bit from unexpected damage.
| Type |
Hole Size Range (in/mm) |
Max. O.D. (in/mm) |
Sub O.D. (in/mm) |
I.D. (in/mm) |
Connection API |
| LB127 | 6 ~ 6-3/9(152.4 ~ 161.9) | 5(127) | 4-1/2(114.3) | 1-1/2(38.1) | 3-1/2REG |
| LB168 | 7-1/2 ~ 8-1/2(190.5 ~ 215.9) | 6-5/8(168) | 5-3/4(146) | 2-1/4(57.2) | 4-1/2REG |
| LB175 | 8-5/8 ~ 9-5/8(219 ~ 244.5) | 6-57/64(175) | 5-3/4(146) | 2-1/4(57.2) | 4-1/2REG |
| LB245 | 11-1/2 ~ 13(292.1 ~ 330.2) | 9-5/8(244.5) | 8(203.2) | 2-13/16(71.4) | 6-5/8REG |
| LB330 | 14-3/4 ~ 17-1/2(374.7 ~ 444.5) | 13(330) | 9-1/2(241.3) | 3(76.2) | 7-5/8REG |
