The drilling jar which is connected with drill tool and worked with drill string is a downhole stuck freeing tool in drilling operation .It is a first selected tool for directional well,complicated well and deep well.The drilling jar is consisting of ZSJ type drilling up jar and ZXJ type drilling down jar,both they can be used mutually or operated separately .The up jarring section takes use of hydraulic mechanism,the jarring force can be adjusted according to up elevating load but can not exceed the max.load for tool load rated .The down jarring section takes use of mechanical friction mechanism, the jarring force is well preadjusted by adjusting device before put into downhole.No re-adjustment can be allowed after jar is put into downhole.
Up jarring test data
Type |
ZSJ80 |
ZSJ76 |
ZSJ70 |
ZSJ62 |
ZSJ56 |
ZSJ46 |
Rated release force(KN)
|
400~600 |
400~600 |
350~550 |
300~450 |
200~350 |
150~250 |
Down jarring test data
Type |
ZXJ80 |
ZXJ76 |
ZXJ70 |
ZXJ62 |
ZXJ56 |
ZXJ46 |
Max.release force(KN)
|
600 |
600 |
550 |
500 |
400 |
250 |
Thechnical specifications and parameters
Type
Parameters
Item |
ZSJ 80
ZXJ 80 |
ZSJ 76
ZXJ 76 |
ZSJ 70
ZXJ 70 |
ZSJ 62
ZXJ 62 |
ZSJ 56
ZXJ 56 |
ZSJ 46
ZXJ 46 |
O.D.(mm) |
203 |
197 |
178 |
160 |
146 |
121 |
I.D(mm) |
71.4 |
71.4 |
70 |
57 |
57 |
51 |
Pull down
overall length
(mm) |
Up |
5515 |
5515 |
5424 |
5360 |
5730 |
5270 |
Down |
5250 |
5250 |
5215 |
5208 |
5000 |
5125 |
Pull down
stroke(mm) |
Up |
368 |
368 |
344 |
344 |
332 |
305 |
Down |
178 |
178 |
178 |
178 |
180 |
178 |
Thread conn. API |
6 5/8"REG |
6 5/8"REG |
NC50 |
NC46 |
6 5/8"REG |
NC38 |
Max.tensile load(KN) |
2500 |
2500 |
2500 |
2500 |
2500 |
2500 |
Max.Working Torque(N.m) |
20 x 103 |
18 x 103 |
15 x 103 |
15 x 103 |
15 x 103 |
13 x 103 |
Weight(KG) |
Up |
1085 |
980 |
680 |
530 |
480 |
330 |
Down |
1027 |
920 |
645 |
520 |
457 |
310 |
|