KXJ Fishing Bumper Sub

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. 

KXJ Fishing Bumper Sub

Working mechanism

● 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 . 

Specifications - KXJ Fishing Bumper Sub

Parameter/Model

KXJ
31B

KXJ
34B

KXJ
36B

KXJ
42B

KXJ
44B

KXJ
46B

KXJ
62B

KXJ
64B

KXJ
70B

KXJ
76B

KXJ
80B

KXJ
85B

KXJ
90B

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 5/8REG

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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