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Workover fishing tool
KXJ FISHING BUMPER SUB
- Type:Workover fishing tool
- CAS No:
- Qty in 20' FCL:
- Min. Order:
- Packaging:
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Parameter/Model
KXJ31B
KXJ34B
KXJ36B
KXJ42B
KXJ44B
KXJ46B
KXJ62B
KXJ64B
KXJ70B
KXJ76B
KXJ80B
KXJ85B
KXJ90B
O.D.(mm)
79
89
95
108
114
121
159
165
178
197
203
219
229
I.D.(mm)
25.4
28
32
38
38
38
51
51
70
70
70
76
76
Sealing pressure(Mpa)
20
20
20
20
20
20
20
20
20
20
20
20
20
Max.tensile load(kN)
300
400
500
700
1120
1200
1430
1430
1530
1630
1630
1630
2200
Max.work torque(kN.m)
3
3.5
4
6
7
8
13
13
15
20
20
20
25
Work stroke(mm)
508
508
508
508
1000
1000
1400
1400
1400
1500
1500
508
1500
Connection
NC23
NC26
NC26
NC31
NC31
NC38
NC50
NC50
NC50
6 5/8
REG
6 5/8
REG
6 5/8
REG
7 5/8
REG
Closed length(mm)
1410
1438
1410
1608
2100
2110
2604
2604
2650
2730
2730
1769
2760
Weight
45kg
50kg
58kg
95kg
130kg
146kg
240kg
285kg
330kg
430kg
455kg
383kg
660kg
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KXJ type bumper jar(hereinafter called as bumper jar) is a mechanical jarring tool. It can make jar repeatedly the stuck drill stem to free from stuck point. When stuck drill stem can not be released by lifting and jarring, the bumper jar can be rotated to make releasable fishing tool to release fish. When used with mechanical internal cutter, it can provide an expected feeding force to the internal cutter so as to cutting steadily. When used with reversing unit, it can compensate the rising stroke for threads after reversing.
Working mechanism
l Energy conversion in jarring operation
Jarring downward is made by means of energy conversion. Raising drill stem shall make
bumper jar to be pull down at a certain height to produce potential energy. Go on raising drill
stem, the drill stem has a strain energy due to spring strain. When drill stem is lowered suddenly
, the energy stored in drill stem force the drill stem to move downward in acceleration.When
bumper jar reach a closed position, the above two energies at this instant change into large
downward jarring force.
● Main factors having influence on jarring force
The bigger hanging weight on top drill stem of bumper jar makes a bigger jarring force;
The longer the spring extension of drill stem is when raising drill stem, the bigger the jarring
force is;
The longer the stroke of the bumper jar is , the bigger the jarring force of jar is .
