Junk Sub
Junk SubDuring drilling process, drilling fishing cup is applied mainly for fishing of shivers and fallen objects such as carbide tooth, drill bit and bearing which can not be carried out of hole by conventional fluid circulation, etc. It possesses important functions to keep hole toe cleaning, increase bit service life, reduce and prevent drill bit from unexpected damage.StructureDue to the fact that the O.D. of external bowl of fishing cup is bigger and a smaller circular space is available between external bowl of fishing cup and well hole, the mandrel diameter at cup mouth is larger so that it has a bigger annular space, therefore, the fluid at the cup mouth form a swirls and suddenly fall down so as to reduce the carrying capacity. By this way, some heavy objects will drop in cup and be fished out so that the purpose of cleaning of hole toe is carried out.Technical Parameters -- Junk Sub Model Hole Size (mm) Thread Conn. I.D. (mm) O.D. (mm) LB94 108~117.5 2 3/8 REG 19 94 LB102 117.5~124 2 7/8 REG 32 102 LB114 130~149 3 1/2 REG 38 114 LB127 152.4~162 3 1/2 REG 38 127 LB140 165~190.5 3 1/2 REG 38 140 LB168 190.5~216 4 1/2 REG 57 168 LB178 219~244.5 4 1/2 REG 57 178 LB190 229~273 4 1/2 REG 57 190 LB197 235~297.5 4 1/2 IF 70 197 LB219 244~295 6 5/8 REG 76 219 LB229 254~305 6 5/8 REG 76 229 LB245 292~330 6 5/8 REG 76 245 LB280 330~375 7 5/8 REG 76 280 LB311 327~375 7 5/8 REG 76 311 LB327 375~444.5 7 5/8 REG 76 327 LB340 386~456 7 5/8 REG 76 340If you have any further requirements, please feel free to contact us
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