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KXJ Type Fishing Bumper Sub
Operation:
KXJ type bumper sub is a mechanical jarring tool. It allows operators to bump up or down repeatedly until the fishing objectives are met or when the stuck drill stem is released. In event where stuck drill stem cannot be released by lifting and jarring, the bumper sub can be rotated to engage and disengage releasable fishing tools to release the fish. In milling and cutting operations, the bumper sub is used to provide feeding force to the mechanical internal cutter, ensuring a reliable and even cut. When the bumper sub is used with a reversing unit, it helps to compensate the rising stroke for threads after reversing.
Working mechanism
●Energy conversion in jarring operation
Downward jarring forced is achieved through the conversion of stored energy to kinetic energy. When lift load is applied to the drill stem, the bumper jar is pulled open to a certain height creating a potential energy. As more lift load is applied, the drill stem begins to accumulate stored strain energy due to the spring extension. Sudden release of the lift load will convert the stored strain energy in the drill stem to a downward acceleration force. As the drill stem accelerate downwards, the bumper jar is released towards its closed position, releasing its potential energy. At this instant, both released energies combine, creating a large downward jarring force.
●Main factors that influence the jarring force
Hanging weight on top of drill stem with the bumper jar. Higher hanging weight will create higher jarring force.
Length of spring extension of the drill stem. Longer length of spring extension during lifting will provide a greater jarring force.
Stroke length of the bumper jar. Longer stroke length will provide a bigger jarring force.
Available model:
KXJ31B KXJ34B KXJ36B KXJ42B KXJ44B KXJ46B KXJ62B KXJ64B KXJ70B KXJ76B KXJ80B KXJ85B KXJ90B
Specifications - KXJ Type Fishing Bumper Sub
1 Fishing Bumper Sub KXJ31B 79 25.4 30 300 3 508" 2 3/8
REG" 1410 45
2 Fishing Bumper Sub KXJ34B 89 28 30 400 3.5 508 NC26 1438 50
3 Fishing Bumper Sub KXJ36B 95 32 30 500 4 508 NC26 1410 58
4 Fishing Bumper Sub KXJ42B 108 38 30 700 6 1000 NC31 2100 95
5 Fishing Bumper Sub KXJ44B 114 38 30 1120 7 1000 NC31 2100 130
6 Fishing Bumper Sub KXJ46B 121 38 30 1200 8 1000 NC38 2110 146
7 Fishing Bumper Sub KXJ62B 159 51 30 1430 13 1400 NC50 2604 240
8 Fishing Bumper Sub KXJ64B 165 51 30 1430 13 1400 NC50 2604 285
9 Fishing Bumper Sub KXJ70B 178 70 30 1530 15 1400 NC50 2650 330
10 Fishing Bumper Sub KXJ76B 197 70 30 1630 20 1500" 6 5/8
REG" 2730 430
11 Fishing Bumper Sub KXJ80B 203 70 30 1630 20 1500" 6 5/8
REG" 2730 455
12 Fishing Bumper Sub KXJ85B 219 76 30 1630 20 508" 6 5/8
REG" 1769 383
13 Fishing Bumper Sub KXJ90B 229 76 30 2200 25 1500" 7 5/8
REG" 2760 660
