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The drilling jar connecting with drill tool and workingwith drill strings is a downhole stuck freeing tool in drilling operation. Whendrill tool is happened to be stuck in downhole, the stuck drill tool can bereleased by in time starting the drilling jar to provide continuous up jarringor down jarring . It is a desire tool for directional well, complicated welland deep well.

The drilling jar is consisting of ZSJ type drilling upjar and ZXJ type drilling down jar , both can be used mutually or operatedseparately . The up jarring section takes use of hydraulic mechanism; thejarring force can be adjusted according to up elevating load but can not exceedthe max. load for tool load rated. The down jarring section takes use ofmechanical friction mechanism; the jarring force is well pre-adjusted byadjusting device before put into down-hole. No re-adjustment can be allowedafter jar is put into down-hole.


Parameters/Model

ZSJ80B

ZSJ76B

ZSJ70B

ZSJ64B

ZSJ62B

ZSJ56B

ZSJ46B

ZXJ80B

ZXJ76B

ZXJ70B

ZXJ64B

ZXJ62B

ZXJ56B

ZXJ46B

O.D. (mm)

203

197

178

165

160

146

121

I.D. (mm)

71.4

71.4

70

57

57

57

47

Pull down overall length (mm)

Up

5515

5515

5424

5360

5360

5730

5300

Down

5250

5250

5215

5215

5215

5000

4760

Pull down stroke (mm)

Up

368

368

344

344

344

332

305

Down

178

178

178

178

178

180

178

API Connection

6  5/8 REG

6  5/8 REG

NC50

NC46

NC46

4  1/2 FH

NC38

Max.tensile load (KN)

2500

2500

2300

2200

2200

2000

1400

Max.working Torque (N.m)

20×103

18×103

15×103

15×103

15×103

15×103

13×103

Rated release force for up jar (KN)

400600

400600

350550

300450

300450

200350

150250

Max.up jarring released force (KN)

750

750

550

550

550

450

270

Max.down jarring release force (KN)

600

600

550

500

500

400

250

Weight

2124kg

1950kg

1350kg

1200

1090kg

870kg

650kg