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The Two-Way Shock Absorber Type JZ-YS is an effective shock absorbing device. It can be used to reduce or eliminate both transversal and longitudinal vibration of drill string, thus maintaining normal weight-on-bit (WOB) and torque, reducing vibration failure on bit,drill string and surface equipment, and leading to improvement in rate of penetration (ROP) and reduction in drilling cost. At present, all of the home-made shock absorbers can reduce the vibration only in one direction (longitudinally), and can not work effectively when
used for drilling operation in hard formation and gravel formation.
| Model | 121 | 165/159 | 203/197 |
| OD | 121(4 3/4) | 165(6 1/2)/159(6 1/4) | 203(8)/197(7 3/4) |
| mm(inch) | |||
| ID | 50.8(2) | 57.2(2 1/4) | 71.4(2 13/16) |
| mm(inch) | |||
| OAL(Locking place) | 6370(251) | 7015(276) | 7310(288) |
| mm(inch) | |||
| Upper Stroke | 210(8 1/4) | 142(5 9/16) | 145(5 11/16) |
| mm(inch) | |||
| Lower Stroke | 197(7 3/4) | 172(6 3/4) | 178(7) |
| mm(inch) | |||
| Conn. | NC38 | NC50 | 6 5/8REG |
| Max Working Load | 1950 | 3750 | 6650 |
| (KN) | |||
| Max Working Torque | 15 | 25 | 35 |
| (KN·M) | |||
| Upward Jarring Force | 450 | 630 | 820 |
| (KN) | |||
| Downward Jarring Force | 230 | 360 | 460 |
| (KN) | |||
| Pumping Area(cm²) | 42 | 76 | 134 |
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