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ZJS Jar Intensifier

ZJS Jar Intensifier

The ZJS type jar intensifier is a kind of down hole fishing jar designed to increase jarring energy to top jar .Therefore ,it must be run in conjunction with YSJ type hydraulic top jar or CSJ type super jar. Its main function is to supply acceleration to the upper end of the jar during the free jarring stroke. With a special function , the intensifier is essentially a fluid spring which not only can accelerate the top jarring action but also make the jarring action directly to strike on the fish and reduce damages to the drill tool and fishing tool.

ZJS Jar Intensifier

Working principle
When it is used, the jar intensifier is connected on the top of drill collar and on the lower end of drill stem. When the fishing tool engage the fish and the drill tool is lifted up , the silicone oil in the top chamber of piston is compressed and a large number of energy is thus stored .During lifting , when top jar reach up to free impact stroke, the stored energy in the jar intensifier will suddenly release, the energy suddenly released will provide a very large acceleration for drill collar and top jar to move upward .When the top jar reaches up to max. stroke, a strong top jarring action will impact directly on the fish, as a result, one time jarring is produced, and more times jarring will be effected by repeating this course.

Specifications – ZJS Jar Intensifier 

Parameter Model

ZJS31B

ZJS36B

ZJS42B

ZJS44B

ZJS46B

ZJS62B

ZJS64B

ZJS70B

ZJS76B

ZJS80B

ZJS90B

O.D. (mm)

79

95

108

114

121

160

165

178

197

203

229

I.D. (mm)

25.4

28

38

38

38

57

57

57

71.4

71.4

76

Overall length of pull down (mm)

2991

3110

3240

3340

3340

4500

4500

4000

4010

4010

4070

Stroke (mm)

215

215

250

250

250

330

330

310

330

330

330

Cnonection

2 3/8REG

NC26

NC31

NC31

NC38

NC50

NC50

NC50

6 5/8REG

6 5/8REG

7 5/8REG

Max.tensile load downhole (KN)

300

550

700

800

900

1500

1500

1800

2100

2200

2500

Max.work torque (kN.m)

3

4

6

7

8

15

15

17

20

20

22

Sealing pressure

20

20

20

20

20

20

20

20

20

20

20

Pull down Full stroke force (tf)

13~15

17~20

25~30

25-30

30~35

60~65

60~65

75~85

62~67

62~67

75~85

Weight

120kg

170kg

185kg

200kg

230kg

530kg

560kg

600kg

860kg

900kg

1030kg

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